WO2019000692A1

WO2019000692A1 - Three-dimensional graphic rendering method, apparatus, device, and storage medium

Info

Publication number: WO2019000692A1
Application number: PCT/CN2017/104816
Authority: WO
Inventors: 叶洪
Original assignee: 广州视源电子科技股份有限公司; 广州视睿电子科技有限公司
Priority date: 2017-06-27
Filing date: 2017-09-30
Publication date: 2019-01-03
Also published as: CN107248192A

Abstract

A three-dimensional graphic rendering method, apparatus, and device, and a storage medium, the method comprising: acquiring first point coordinates, second point coordinates, and third point coordinates (201); using the first point coordinates and the second point coordinates as centre point coordinates and contour point coordinates of the bottom contour of the three-dimensional graphic to be rendered, and combining a preset relationship between a specified contour point and centre point of the bottom contour of a standard three-dimensional graphic, determining a first scaling ratio of the bottom contour of the three-dimensional graphic to be rendered relative to the bottom contour of a standard three-dimensional graphic (202); on the basis of the first scaling ratio, rendering the bottom contour of the three-dimensional graphic to be rendered (203); on the basis of the distance between the second coordinates and the third coordinates and the direction of extension of the side contours of the standard three-dimensional graphic, rendering the other contours of the three-dimensional graphic to be rendered (204). The present method can render the three-dimensional graphic desired by the user, improving the accuracy of rendering a three-dimensional graphic.

Description

Stereo graphic drawing method, device, device and storage medium

Technical field

The present invention relates to the field of graphics technologies, and in particular, to a stereoscopic graphics rendering method, apparatus, device, and storage medium.

Background technique

At present, in teaching, drawing and other scenes, it is often involved in drawing stereoscopic graphics. A solid figure can be understood as a figure formed by projecting a three-dimensional body onto a two-dimensional plane according to a specified projection condition, and can also be understood as a figure drawn by displaying a three-dimensional body at a specific angle of view on a two-dimensional plane. The three-dimensional body may be a cylinder, a cone, two cylinders whose bottom surface is a regular polygon and whose bottom surfaces are parallel.

In the related art, a stereoscopic graphic sample may be pre-stored in the drawing software, and a stereoscopic graphic sample is dragged out from the toolbar of the drawing software according to a user operation instruction to perform position and size adjustment, thereby obtaining a stereoscopic graphic. For another example, a three-point method can be used to draw a three-dimensional figure, as shown in FIG. 1. FIG. 1 is a schematic diagram of drawing a cylindrical figure by a two-point method in the related art. According to the user operation instruction, two points are determined in the plane: P1 and P2, two coordinate points are used as diagonal vertices, and the other two vertex coordinates are determined based on a preset rule, and the size of the cylinder to be drawn is obtained. Rectangular P1P4P2P3. A cylinder figure is reversed according to the determined rectangle, and the cylinder figure is in the rectangle P1P4P2P3, thereby realizing the drawing of the cylinder figure.

It can be seen that the above method has poor response to the operation instruction, and the stereoscopic graphic drawn according to the operation instruction has a gap with the stereoscopic graphic that the user intends to draw, resulting in low accuracy of the drawn stereoscopic graphic.

Summary of the invention

Based on this, the present invention provides a method, a device, a device and a storage medium for drawing a solid figure, so as to solve the defect that the response effect on the operation instruction is poor, and the accuracy of the drawn three-dimensional figure is low.

According to a first aspect of the embodiments of the present invention, a method for drawing a solid figure is provided, the method comprising:

Obtaining a first point coordinate, a second point coordinate, and a third point coordinate;

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure Relationship Drawing a first scaling ratio of a bottom surface contour of the solid figure relative to a bottom surface contour of the standard solid figure;

Drawing a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio;

The contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.

In an optional implementation manner, the standard three-dimensional figure is a graphic that displays a standard three-dimensional body on a two-dimensional plane, and the standard three-dimensional body includes a cylinder, a cone, or two bottom surfaces and two bottom surfaces. a cylinder of the same regular polygon, if the standard three-dimensional body is a cylinder or a cone, the side contour is a contour bus; if the standard three-dimensional body is a cylinder with two bottom surfaces parallel and two bottom surfaces being the same regular polygon, The side profile is a side ridgeline.

In an optional implementation manner, the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure includes: a correspondence between a sample length and a sample angle, and the sample length is a standard solid figure. The length of the line segment formed by the contour point and the center point is specified, and the sample angle is an angle between the line segment and the preset reference line.

In an optional implementation manner, the determining step of the correspondence between the sample length and the sample angle includes:

Dividing the bottom surface contour of the standard three-dimensional body to obtain at least two equal points;

Determining, according to a projection matrix corresponding to the preset viewing angle, a projection point of the projection plane corresponding to the projection plane corresponding to the preset viewing angle, and a projection point of the projection plane corresponding to the center of the standard three-dimensional body at the preset viewing angle, The projection point corresponding to the point is determined as the specified contour point, and the projection point corresponding to the center is determined as the center point;

And determining, according to the determined specified contour point and the center point, a sample length of the line segment formed by the specified contour point and the center point in the standard solid figure, and an angle between the line segment and the sample line of the reference line.

In an optional implementation manner, the first point coordinate and the second point coordinate are respectively used as a center point coordinate and a contour point coordinate of a bottom surface contour in the solid figure to be drawn, and combined with a preset standard three-dimensional figure. The relationship between each specified contour point and the center point on the bottom surface contour determines the first scaling ratio of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid graphic, including:

Calculating a target length of the target line segment formed by the first point coordinate and the second point coordinate, and a target angle between the target line segment and the reference line;

From the angle of the sample, the angle between the samples having the smallest angle with the target is selected;

Comparing the target length with the sample length corresponding to the selected sample angle, obtaining a first scaling ratio of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid image.

In an optional implementation manner, each of the specified contour points and the center of the preset standard solid figure has a contour point and a center The relationship of points further includes: drawing information required to draw a bottom surface contour in the standard solid figure; if the standard three-dimensional body is a cylinder or a cone, the drawing information includes the longest contour of the bottom surface in the standard solid figure Radius and length and extension direction of the shortest radius; if the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the drawing information includes a center point to a vertex of the bottom surface contour in the standard solid figure Length and direction;

The drawing the bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio includes:

Scaling the length in the rendering information based on the first scaling ratio;

The bottom surface contour of the stereoscopic graphic to be drawn is drawn by the length obtained by the scaling and the direction in the drawing information.

In an optional implementation manner, if the standard three-dimensional body is a cylinder or a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the determining step of the extending direction of the side contour in the standard three-dimensional figure includes:

The extending direction of the side contour in the standard solid figure is determined based on the coordinates of the specified contour point in the upper bottom surface contour of the standard solid figure and the coordinates of the specified contour point in the lower bottom surface contour.

In an optional implementation manner, if the standard three-dimensional body is a cone, the determining step of extending the side profile in the standard three-dimensional figure includes:

Determining the extending direction of the contour bus bar in the standard solid figure based on the coordinates of the specified contour point in the bottom surface contour in the standard solid figure and the vertex coordinates of the standard solid figure.

In an optional implementation, the method further includes:

Determining, according to the distance between the second point coordinate and the third point coordinate, and the length and the extending direction of the side contour in the standard solid figure, a second scaling ratio of the side contour of the solid figure to be drawn relative to the side contour of the standard solid figure;

Obtaining three-dimensional parameters required to draw the standard solid figure using a three-dimensional drawing engine;

And scaling the three-dimensional parameter based on the first scaling ratio and the second scaling ratio;

Enter the 3D parameters obtained by scaling into the 3D drawing engine.

In an optional implementation, the method further includes:

And drawing, according to the three-dimensional drawing engine, the three-dimensional parameters obtained by the scaling, the three-dimensional graphics to be drawn;

Receiving a rotation operation instruction for the stereoscopic graphic to be drawn;

Converting a display angle of view of the three-dimensional body corresponding to the stereoscopic graphic to be drawn according to the rotation operation instruction;

A three-dimensional figure of the three-dimensional body at the display viewing angle is drawn.

According to a second aspect of the embodiments of the present invention, a stereoscopic graphics rendering apparatus is provided, the apparatus comprising:

a coordinate acquiring module, configured to acquire a first point coordinate, a second point coordinate, and a third point coordinate;

a ratio determining module, configured to respectively use the first point coordinate and the second point coordinate as a center point coordinate and a contour point coordinate of a bottom surface contour in the stereoscopic graphic to be drawn, and combined with each of the preset bottom surface contours of the standard three-dimensional graphic a relationship between the contour point and the center point, determining a first scaling ratio of the bottom surface contour of the solid graphics to be drawn relative to the bottom surface contour of the standard solid graphics;

a graphic drawing module, configured to draw a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio; a distance according to the second point coordinate and the third point coordinate, and an extending direction of the side contour in the standard solid graphic, Draw the outline of the other faces in the perspective view to be drawn.

According to a third aspect of the embodiments of the present invention, an electronic device is provided, including:

processor;

a memory for storing processor executable instructions;

Wherein the processor is configured to:

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure a relationship determining a first scaling ratio of a bottom surface contour of the solid graphics to be drawn with respect to a bottom surface contour of the standard solid graphics;

In an optional implementation, the electronic device is a smart tablet.

According to a fourth aspect of the embodiments of the present invention, a computer storage medium is provided, where the program medium includes program instructions, where the program instructions include:

Applying the solution of the embodiment of the present invention, a bottom surface contour of the three-dimensional graphic is drawn by two points, and other surface contours of the three-dimensional graphic are drawn through the third point, thereby realizing the drawing of the three-dimensional graphic, because the user can control the bottom surface contour of the solid graphic through two points. The size controls the other contours in the solid figure through the third point, so the drawing instructions can be actively responded to draw the three-dimensional graphics that the user desires to draw, thereby improving the accuracy of drawing the stereoscopic graphics.

The above general description and the following detailed description are intended to be illustrative and not restrictive.

DRAWINGS

The accompanying drawings, which are incorporated in the specification of FIG

Fig. 1 is a schematic view showing a cylindrical figure drawn by a two-point method in the related art.

FIG. 2A is a flowchart of a method for drawing a solid figure according to an exemplary embodiment of the present invention.

FIG. 2B is a schematic diagram showing the drawing of a cylinder according to an exemplary embodiment of the present invention.

FIG. 2C is a schematic diagram showing the drawing of a cone according to an exemplary embodiment of the present invention.

FIG. 3A is a flowchart of a sample data group determining method according to an exemplary embodiment of the present invention.

FIG. 3B is a schematic diagram of a specified contour point determination according to an exemplary embodiment of the present invention.

FIG. 3C is a schematic diagram of a cylindrical figure comparison according to an exemplary embodiment of the present invention.

FIG. 4 is a flow chart of another method for drawing a solid figure according to an exemplary embodiment of the present invention.

FIG. 5 is a hardware structural diagram of a computer device in which a stereoscopic graphics rendering device is shown according to an exemplary embodiment of the present invention.

FIG. 6 is a block diagram of a stereoscopic graphics rendering apparatus according to an exemplary embodiment of the present invention.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with aspects of the invention as detailed in the appended claims.

The terminology used in the present invention is for the purpose of describing particular embodiments, and is not intended to limit the invention. The singular forms "a", "the" and "the" It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information may also be referred to as the second information without departing from the scope of the invention. Similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determination."

In order to meet the needs of teaching and other application scenarios, a three-dimensional plan is often used to display a three-dimensional body on a two-dimensional plane in a pseudo 3D manner, and the image on a two-dimensional plane can be referred to as a three-dimensional figure. In the related art, a two-point method is often used to draw a three-dimensional figure. As shown in FIG. 1, the P1 point and the P2 point are determined on the screen according to a user operation instruction, and two coordinate points are used as a pair of diagonal vertices, and based on a preset rule, The other two vertex coordinates P3 and P4 are determined, and a rectangle P1P4P2P3 for defining the size of the cylinder to be drawn is obtained. A cylinder pattern is reversed according to the determined rectangle, and a contour point in the upper and lower bottom surfaces of the cylinder pattern and the bus bar are on the side of the rectangle P1P4P2P3, thereby realizing the drawing of the cylinder pattern. It can be seen that when the user specifies the P1 and P2 points, the user can see the cylindrical figure obtained by drawing, and the user can not draw the desired cylindrical figure by controlling two points very well, and other three-dimensional figures are similar, so two points are adopted. The three-dimensional graphics drawn by the method have a gap with the stereoscopic graphics that the user expects to draw, resulting in low accuracy of the drawn stereoscopic graphics. When the gap is large, the user needs to delete and then re-draw, resulting in low drawing efficiency.

Based on this, in order to avoid the defect that the drawn three-dimensional graphics have low accuracy, the present invention provides a three-dimensional graphic drawing method, which can draw a bottom surface contour of the three-dimensional graphic through two points, and draw other contour contours of the three-dimensional graphic through the third point, thereby To realize the drawing of the three-dimensional figure, the user can control the size of the bottom surface of the solid figure through two points, and control the other surface contours of the three-dimensional figure through the third point, so that the drawing instruction can be actively responded to draw the three-dimensional figure that the user desires to draw, and then Improve the accuracy of drawing stereo graphics. The solution of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 2A, FIG. 2A is a flowchart of a method for drawing a solid figure according to an exemplary embodiment of the present invention, which may include the following steps 201 to 204:

In step 201, a first point coordinate, a second point coordinate, and a third point coordinate are acquired.

In step 202, the first point coordinate and the second point coordinate are respectively used as the center point coordinate and the contour point coordinate of the bottom surface contour in the stereoscopic graphic to be drawn, and combined with the specified contour on the bottom surface contour of the preset standard solid graphic. The relationship between the point and the center point determines a first scaling ratio of the bottom surface contour of the solid figure to be drawn relative to the bottom surface contour of the standard solid figure.

In step 203, a bottom surface contour of the stereoscopic graphic to be drawn is drawn based on the first scaling ratio.

In step 204, the contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.

The embodiment of the present invention can be applied to a smart device, and the smart device can be a smart tablet, a smart phone, a smart learning machine, a tablet computer, a PDA (Personal Digital Assistant), or a PC (Personal Computer). Functional electronic device. The user can use a finger or a stylus to draw a graphic on the touch screen of the smart device, or use a mouse to control the cursor on the screen of the smart device to perform graphic drawing, and the smart device can generate a drawing instruction according to the user operation, and determine three according to the drawing instruction. Point coordinates, and then three-dimensional graphics. In addition, the user can also operate an associated device that is bound to the smart device, and the associated device transmits a drawing instruction to the smart device, draws a stereoscopic graphic or the like through the smart device.

The three-dimensional figure can be understood as a figure formed by projecting a three-dimensional body onto a two-dimensional plane according to a specified projection condition, and can also be understood as a figure drawn by displaying a three-dimensional body at a preset angle of view on a two-dimensional plane. The stereoscopic graphics obtained by projecting three-dimensional bodies with different projection conditions or different viewing angles may be different. The projection conditions include the placement angle of the three-dimensional body, the distance between the three-dimensional body and the projection device, the projection direction, and the projection method. The projection device can be a device such as a camera. Projection methods include orthogonal projection. The projection direction includes projection toward the XOY plane, projection toward the XOZ plane, projection onto the YOZ plane, and the like, and is not limited herein. The specified projection condition corresponds to the preset angle of view, and the graphic formed by projecting onto the two-dimensional plane according to the specified projection condition may be represented as a graphic drawn on the two-dimensional plane to display the three-dimensional body at a specified angle of view.

Further, in order to reflect a more realistic three-dimensional body in a two-dimensional plane, the visible contour line and the invisible contour line can be displayed separately according to the visibility of each contour line in the three-dimensional figure.

For example, the distinguishing display may be: distinguishing between the visible contour line and the invisible contour line by using a solid line and a broken line respectively; or respectively, respectively, distinguishing the visible contour line from the invisible contour line by using different transparency; or, respectively, using different gray scales The visible outline is displayed separately from the invisible outline, wherein the gray scales may be different gray levels of the same color or different gray levels of different colors; or, the visible lines and the invisible outlines are respectively used with different colors. Distinguish the display; or, separate the visible outline from the invisible outline by the different thicknesses of the lines.

It can be seen that the visible contour line and the invisible contour line are displayed separately according to the visibility of each contour line in the solid figure. It can make the drawn three-dimensional graphics more realistic and give users a visual enjoyment.

In the embodiment of the present invention, the standard stereoscopic graphic is a graphic showing a standard three-dimensional body on a two-dimensional plane with a preset viewing angle, and the standard three-dimensional graphics corresponding to different standard viewing angles may be different when displaying the standard three-dimensional body.

In an optional implementation manner, the standard three-dimensional body may be a cylinder or a cone, or may be a cylinder with two bottom surfaces parallel and two bottom surfaces being the same regular polygon.

If the standard three-dimensional body is a cylinder, the side profile is a contour bus, and the solid figure to be drawn is the cylinder figure to be drawn. When drawing a cylinder shape to be drawn, you can draw a bottom contour based on the first two points, and then draw the contour bus and the other bottom contour according to the third point. It can be seen that the drawing of the cylinder figure can be realized by the solution of the invention.

If the standard three-dimensional body is a cone, the side contour is the contour bus, and the solid figure to be drawn is the cone image to be drawn. When drawing the cone shape to be drawn, you can draw the bottom contour based on the first two points and then draw the contour bus according to the third point. It can be seen that the drawing of the cone pattern can be realized by the solution of the invention.

If the standard three-dimensional body is a cylinder whose two bottom faces are parallel and the two bottom faces are the same regular polygon, for example, a cube, two bottom faces are parallel, and the two bottom faces are the same regular hexagonal column, the side profile is a side ridge line, and the solid figure is to be drawn. That is, the cylinder pattern to be drawn. When drawing a cylinder shape to be drawn, you can draw the bottom polygon outline based on the first two points, and then draw the side ridge according to the third point. It can be seen that the drawing of a specific cylinder figure can be achieved by the solution of the invention.

Regarding the order of coordinate point acquisition and graphic drawing, after acquiring the first point coordinate, the second point coordinate, and the third point coordinate, all the faces of the solid figure can be drawn; or the first point coordinate and the second point can be obtained. After the point coordinates, first draw a bottom surface in the solid figure, then obtain the third point coordinates, and draw the other side of the solid figure.

Regarding the determination of the point coordinates, in one example, the three point coordinates can be determined by clicking the click position corresponding to the instruction. The click command may be a smart device or an associated device bound to the smart device: a mouse click command, a finger click command, or a touch pen click command. If the click instruction is on the associated device, the associated device can send a drawing instruction carrying three point coordinates to the smart device or the like. The user can click on three discontinuous points respectively, and the device determines three discontinuous points as the first point, the second point, and the third point according to the order of clicking. For example, according to the first click instruction, the first point coordinate is obtained, and according to the second click instruction, the second point coordinate is obtained, and according to the third click instruction, the third point coordinate is obtained.

Although the above method can determine the stereoscopic figure through three points, in the drawing process, the first point coordinate, the second point coordinate, and the third point coordinate are directly determined by the click operation, and the first point coordinate and the second point are After the coordinates are determined, the size of the bottom surface contour in the solid graphics cannot be modified. After the third coordinate is determined, the other surface contours of the solid graphics cannot be modified. To overcome the defect, the embodiment of the present invention provides another implementation manner. , you can dynamically adjust the coordinates of the second point, In order to dynamically adjust the size of the bottom surface contour in the solid figure, when the second point confirmation command is received, the coordinate at this time is taken as the final second point coordinate to realize the final confirmation of the bottom surface contour. In addition, the third point coordinates can be dynamically adjusted to dynamically adjust other contours in the solid graphics. When the third point confirmation command is received, the coordinates at this time are used as the final third point coordinates to implement the stereoscopic graphics. Final confirmation of other face contours.

In this implementation manner, a stereoscopic graphic can be drawn by dragging (tracting, sliding, moving). In the drawing process, the point that the user first triggers is taken as the first point, thereby obtaining the first point coordinate. The first point is used as a starting point for sliding, and any point in the sliding track can be used as the second point. According to the first point and the current second point, the bottom contour is drawn. As the coordinates of the second point change continuously, the contour of the bottom surface also changes. By adjusting the coordinates of the second point, the contour of the bottom surface desired by the user can be drawn. When the second confirmation command is received, the coordinates at this time are taken as the final second point coordinates to achieve final confirmation of the bottom contour. The second confirmation command may be a mouse click command, a finger/touch pen click command, or a press command. Similarly, the second point can be used as a starting point for sliding, and any point in the sliding track can be used as the third point. According to the bottom contour and the third point, other planes are drawn. As the coordinates of the third point change, the other surfaces also change. By adjusting the coordinates of the third point, the desired height can be drawn to obtain the desired three-dimensional. Graphics.

It should be pointed out that when the third point is determined, it is also possible to slide without using the second point as a starting point, and to re-select a point as a starting point by lifting the pen/lifting/releasing the mouse, etc., in the sliding track Any point can be used as the third point. For example, select the bottom contour center point (P1 point) as the starting point to slide.

For ease of understanding, the embodiments of the present invention are described in two specific embodiments. FIG. 2B is a schematic diagram showing the drawing of a cylinder according to an exemplary embodiment of the present invention. The first point (P1 point) to the final second point (P2 point), and the final second point to the final third point (P3 point), the displayed figure shows a dynamic effect, each change the coordinates of the second point The bottom contour will be redrawn, and the other contours will be redrawn each time the coordinates of the third point are changed. After determining the bottom contour, by moving the third point, it is possible to present the dynamic effect of drawing the contours of the other contours in the cylinder to be drawn according to the extending direction of the side contours in the standard cylinder pattern according to the distance between the second point and the third point.

For convenience of illustration, FIG. 2B only exemplifies six states in the drawing process. During the drawing process, the first point clicked by the user is taken as the first point (P1 point), and the P1 point is used as the starting point for dragging. Any point in the dragging track is the second point, and the dynamics are dynamic for each second point. The corresponding bottom surface contour is drawn, and FIG. 2B is exemplified by taking the P2' point in the drag track as an example, and the bottom surface contour shown in the second state in FIG. 2B is obtained according to P1 and P2' drawing. When dragging to the P2 point, if a confirmation command is received, the point is determined as the final second point, and the final bottom contour is drawn to be drawn, as shown by state three in FIG. 2B. Then, the P1 point is used as the starting point for dragging, and any point in the drag track is the third point, and the other surface contours of the corresponding cylinder figure are dynamically drawn for each third point, and FIG. 2B is dragging the track in the P3. The point is exemplified as an example, and a cylinder pattern as shown in state four in Fig. 2B is obtained according to the bottom surface contour and the P3' point drawing shown in the state three. When dragged to At point P3, a cylinder pattern as shown in state five in Fig. 2B is obtained according to the bottom surface contour and the P3 point drawing shown in the state three. If a confirmation command is received at point P3, the point is determined to be the final third point and the final cylinder pattern is drawn, as shown in state six of Figure 2B.

As shown in FIG. 2C, FIG. 2C is a schematic diagram showing the drawing of a cone according to an exemplary embodiment of the present invention. The first point (P1 point) to the final second point (P2 point), and the final second point to the final third point (P3 point), the displayed figure shows a dynamic effect, each change the coordinates of the second point The bottom contour will be redrawn, and the other contours will be redrawn each time the coordinates of the third point are changed. After determining the bottom contour, by moving the third point, the height of the cone pattern can be determined, and the distance to be drawn according to the extending direction of the side contour in the standard cone pattern can be determined according to the distance between the second point and the third point. The dynamic effect of other contours in the middle.

Next, steps 202 to 204 are introduced.

In the embodiment of the present invention, the relationship between the specified contour point and the center point on the bottom surface contour of the preset standard solid figure is determined by the first point coordinate and the second point coordinate, and the bottom surface contour of the solid figure to be drawn is determined relative to the standard three-dimensional figure. The first scaling of the bottom surface contour is used to draw the bottom surface contour of the solid graphics to be drawn by using the first scaling ratio, and according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure, Draw the outline of the other faces in the perspective.

First, the relationship between each specified contour point on the bottom surface contour of the preset standard solid figure and the center point, and the extension direction of the side contour in the standard three-dimensional figure are introduced.

When the first point coordinate and the second point coordinate are respectively used as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, in order to infer a specified contour having a similar reference relationship with the second point coordinate in the standard solid figure Point, the sample length of each specified contour point on the bottom contour of the standard solid figure to the center point, and the sample reference relationship of the line segment formed by the specified contour point and the center point with respect to the preset reference object may be obtained in advance. A corresponding parameter set (sample length, sample reference relationship) can be provided for each specified contour point.

Wherein, the specified contour point is a contour point on the bottom contour of the standard solid figure, and the number of designated contour points can be set according to requirements. The number of specified contour points determines the spacing of the specified contour points, which determines the density of the specified contour points. The larger the number of specified contour points, the more the specified contour points corresponding to the second point coordinates and the reference to the second point coordinates are inferred. The more similar the relationship is. Therefore, in consideration of factors such as the processing performance of the smart device, the number of designated contour points is as large as possible, so that a sample reference relationship that is more similar to the reference relationship can be found, thereby drawing a more accurate solid figure.

The center point is the center point of the bottom surface contour in the standard solid figure. For example, when the standard three-dimensional body is a cylinder or a cone, that is, the standard solid figure is a standard cylinder figure or a standard cone figure, the center point is the center of the bottom face ellipse. Standard The projection point of the center of the cylinder or the center of the standard cone at the projection plane corresponding to the preset angle of view. When the standard three-dimensional body is a cylinder whose two bottom faces are parallel and the two bottom faces are the same regular polygon, the center point is a projection point of the center of the regular polygon at a projection plane corresponding to the preset angle of view.

After acquiring the first point coordinate and the second point coordinate, determining a target length of the target line segment formed by the first point coordinate and the second point coordinate, and a reference relationship between the target line segment and the preset reference object; In the sample length and the sample reference relationship, a sample reference relationship that is approximately the same as the reference relationship is selected, and based on the length and the sample length corresponding to the selected reference relationship, the bottom surface contour of the solid image to be drawn is determined relative to the standard three-dimensional The first scale of the underside outline of the graphic.

It can be seen from the above embodiment that by referring to the same preset reference object, the relationship between the standard three-dimensional graphics and the first point coordinates and the second point coordinates can be established, thereby determining the bottom surface contour of the solid graphics to be drawn relative to the bottom surface of the standard three-dimensional graphics. The first scale of the outline.

In one example, the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure includes: a correspondence between a sample length and a sample angle, and the sample length is a specified contour point in the standard solid figure. The length of the line segment formed by the center point, which is the angle between the line segment and the reference line.

In this embodiment, the first two-dimensional coordinate system used by the stereoscopic graphics to be drawn satisfies the specified relationship with the second two-dimensional coordinate system used by the standard solid graphics. The specified relationship may be that the X axis of the first two-dimensional coordinate system coincides or is parallel with the X axis of the second two-dimensional coordinate system, and the Y axis of the first two-dimensional coordinate system coincides with the Y axis of the second two-dimensional coordinate system or parallel.

The preset reference may be a reference line, for example, the reference line may be one of the two-dimensional coordinate systems. The reference relationship may be the angle between the line segment formed by the specified contour point and the center point in the standard solid figure and the reference line.

In view of this, after acquiring the first point coordinate and the second point coordinate, the target length of the target line segment formed by the first point coordinate and the second point coordinate, and the target clip of the target line segment and the reference line may be calculated. An angle of the sample that is the smallest angle from the target is selected from the angle between the samples; and the target length is compared with the length of the sample corresponding to the angle of the selected sample to obtain a solid to be drawn The first scale of the bottom contour of the graphic relative to the bottom contour of the standard solid graphic.

In this embodiment, if the difference between the target angle and the sample angle is the smallest, it can be considered that the projection point corresponding to the selected sample angle is the closest point to the second coordinate point. The line segment formed by the selected sample angle and the center point has a relationship with the line segment formed by the first point coordinate and the second point coordinate. Therefore, the target length can be matched with the angle of the selected sample. The sample length is compared to thereby obtain a first scaling of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid image.

Further, in order to improve the accuracy of the judgment, when screening the angle of the sample, the angle between the sample and the angle of the sample within the preset angle can be selected from the angle of the sample.

It can be seen from the above embodiment that the relationship between the first three-dimensional figure and the first point coordinate and the second point coordinate is established by the angle, and then the first surface contour of the solid image to be drawn is determined relative to the bottom surface contour of the standard three-dimensional figure. The scaling ratio can increase the efficiency of the ratio confirmation.

Determining, according to a first scaling ratio of a bottom surface contour of the stereoscopic graphic to be drawn, relative to a bottom surface contour of the standard solid graphics, and using the first point coordinate and the second point coordinate as the center point coordinates and the contour point of the bottom surface contour in the solid image to be drawn, respectively. The coordinates can be used to draw the bottom contour of the solid image to be drawn according to the bottom contour of the standard solid figure and the first zoom ratio.

In an optional implementation manner, the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure further includes: drawing information required to draw the bottom surface contour in the standard solid figure.

In view of this, when drawing the bottom surface contour, the length in the drawing information may be scaled based on the first scaling ratio; using the length obtained by scaling and the direction in the drawing information, drawing the bottom surface contour of the stereoscopic graphic to be drawn .

For example, if the standard three-dimensional body is a cylinder or a cone, the drawing information includes a length and an extending direction of the longest radius of the bottom surface contour in the standard solid figure, and a length and an extending direction of the shortest radius, based on The first scaling scales the length of the shortest radius and the length of the longest radius in the drawing information to obtain the shortest radius length and the longest radius length after scaling; the shortest radius length after scaling and the shortest drawing information The extending direction of the radius, and the length of the longest radius after scaling and the extending direction of the longest radius in the drawing information are used to draw the bottom surface contour of the solid graphic to be drawn.

The shortest radius may be the distance from the center point of the bottom contour of the standard solid figure to the nearest contour point, and the extension direction of the shortest radius may be the direction from one end to the other end of the shortest radius. The longest radius may be the distance from the center point of the bottom contour of the standard solid figure to the farthest contour point, and the extension direction of the longest radius may be the direction from one end to the other end of the longest radius.

For another example, if the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the drawing information includes the length and direction of the center point to the vertices of the bottom surface contour in the standard three-dimensional figure. Wherein, the apex of the bottom surface contour may be the intersection of adjacent edges in the bottom surface contour. In view of this, the length in the drawing information is scaled based on the first scaling ratio; the bottom surface contour of the stereoscopic graphic to be drawn is drawn using the length obtained by scaling and the direction in the drawing information.

In order to draw the side contours of the solid graphics to be drawn, the extending direction of the side contours in the standard solid graphics may be obtained in advance. The direction in which the side profile extends may be the direction from either end of the side profile to the other end. Due to projection In the case where the condition (predetermined viewing angle) is determined, the extending direction of the side contour in the standard solid figure is fixed, and therefore, regardless of whether the direction of the second point to the third point coincides with the extending direction, when drawing the side contour in the solid figure, Draw according to the extension direction of the side profile in the standard solid figure.

Specifically, according to the projection distance of the second point coordinate and the third point coordinate in the extending direction of the side contour, the side contour length of the stereoscopic image to be drawn may be determined, based on the drawn bottom surface contour and the determined side contour length and extending direction, Draw the outline of the other faces in the perspective to be drawn.

Next, how to determine the relationship between each specified contour point on the bottom surface contour of the preset standard solid figure and the center point, and the extension direction of the side contour in the standard solid figure are introduced.

In this embodiment, at least one type of projection condition (predetermined viewing angle) of the sample data group may be pre-stored, and the sample data group includes the specified contour point and the center point on the bottom surface contour of the standard three-dimensional graphic of the same projection condition (predetermined viewing angle). Relationship, and the direction in which the side contours extend in a standard solid figure.

The projection matrix corresponding to different projection conditions (predetermined viewing angles) may be different. The projection matrix is a matrix for converting three-dimensional coordinates into two-dimensional coordinates.

In an optional implementation manner, a sample data group of a projection condition (preset angle of view) is fixedly stored, and each time the graphics are drawn, the parameters in the sample data group are used for drawing.

In another optional implementation, a sample data set corresponding to a plurality of projection conditions (predetermined viewing angles) may be stored. Determine the sample data set before drawing the solid figure. For example, based on the projection condition (preset angle of view) setting interface, receiving a projection condition (preset angle of view) setting instruction, determining a projection condition (predetermined angle of view) according to the projection condition (preset angle of view) setting instruction, and further determining a corresponding sample The data set is then subjected to stereoscopic graphics based on the determined sample data set. In the setting interface, the projection conditions (preset viewing angle) can be directly described by text, or the standard stereoscopic graphics corresponding to each projection condition (predetermined viewing angle) can be prompted to facilitate the user to view each projection condition (preset viewing angle). The effect of the display, so that the projection condition (preset angle) setting is quickly performed.

The embodiment of the invention further provides a sample data group determining method. As shown in FIG. 3A, FIG. 3A is a flowchart of a sample data group determining method according to an exemplary embodiment of the present invention, where the method includes steps 301 to 304:

In step 301, the bottom surface contour of the standard three-dimensional body is equally divided to obtain at least two halving points.

In this step, the bottom surface contour of the standard three-dimensional body can be N-divided to obtain N equal points. The number of equal divisions determines the setting density of the equal points. When considering the processing performance of the equipment, the number of equal divisions can be as large as possible.

In step 302, based on the projection matrix corresponding to the preset viewing angle, determining that the halving point corresponds to the preset viewing angle a projection point of the projection plane, and a projection point of the projection plane corresponding to the center of the standard three-dimensional body, the projection point corresponding to the sub-point is determined as the specified contour point, and the projection point corresponding to the center is determined as The center point.

In practical applications, it is not necessary to project a true standard three-dimensional object onto a two-dimensional plane (projection screen), and the three-dimensional coordinates of the standard three-dimensional body in the three-dimensional drawing engine can be converted into two by using a projection matrix corresponding to a specified projection condition (predetermined viewing angle). The dimensional coordinates, and then based on the two-dimensional coordinates obtained by the transformation, draw a standard solid figure in a two-dimensional plane.

If the standard three-dimensional body is a cylinder or a cone, the center point is a projection point of the center of the cylinder or the center of the cone at a projection plane corresponding to the preset angle of view. If the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the center point is a projection point of the center of the cylinder bottom surface at a projection plane corresponding to the preset viewing angle. The center of the bottom surface of the cylinder may be a point equal to the distance between the vertices of the bottom surface, that is, the distance from the center of the bottom surface to the apex of the bottom surface is equal. Since the bottom surface is a regular polygon, the center of the bottom surface is the geometric center of the regular polygon.

In order to distinguish the projection point corresponding to the aliquot point and the projection point corresponding to the center point, the projection point corresponding to the quinting point may be determined as the specified contour point, and the projection point corresponding to the center may be determined as the center point.

In step 303, based on the determined specified contour point and the center point, determining a sample length of the line segment formed by the specified contour point and the center point in the standard solid figure, and an angle between the line segment and the sample line of the reference line, And drawing information required to draw a bottom contour in the standard solid figure.

Wherein, if the standard three-dimensional body is a cylinder or a cone, the drawing information may include a length and an extending direction of the longest radius of the bottom surface contour in the standard three-dimensional figure, and a length and an extending direction of the shortest radius. If the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the drawing information may include the length and direction of the center point to the vertices of the bottom surface contour in the standard solid figure.

In step 304, an extension direction of the side profile in the standard solid figure is determined based on the determined specified contour point.

Wherein, if the standard three-dimensional body is a cylinder or a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the coordinates of the specified contour point in the upper bottom surface contour of the standard solid figure and the specified contour in the lower bottom contour are The coordinates of the point determine the direction in which the side profile extends in the standard solid figure.

If the standard three-dimensional body is a cone, the extending direction of the contour bus bar in the standard solid figure is determined based on the coordinates of the specified contour point in the bottom surface contour in the standard solid figure and the vertex coordinates of the standard solid figure.

In this embodiment, the standard three-dimensional body is a three-dimensional body set as a reference in advance. In one example, taking a three-dimensional body as a cylinder, the radius of the cylinder may be R0=1 and the height is H0=2. Since the preset viewing angle is known, the projection matrix Mp of the three-dimensional space to the two-dimensional plane in the preset viewing angle can be obtained, and based on the projection matrix, the coordinate of the arbitrary three-dimensional body can be calculated according to the formula P _projection =P _{three-dimensional} *Mp The projection point coordinates of the dimension plane. For example, the projection point of the projection plane corresponding to the preset angle of view may be determined based on the projection matrix corresponding to the preset angle of view (for distinguishing, it may be referred to as a specified contour point), and specifically, determining the contour point coordinates is in advance Set the projection point coordinates of the projection screen corresponding to the angle of view (specify the contour point coordinates). For another example, the projection point of the projection plane corresponding to the preset perspective can be determined based on the projection matrix corresponding to the preset perspective (which may be referred to as a center point for differentiation). For another example, the projection point coordinate of the standard three-dimensional body projection to the projection plane may be determined based on the projection matrix corresponding to the preset viewing angle, and the projection point coordinate is a coordinate required for drawing the standard solid figure, and then the standard solid figure is drawn according to the determined coordinate. .

As shown in FIG. 3B, FIG. 3B is a schematic diagram of a specified contour point determination according to an exemplary embodiment of the present invention. The schematic diagram takes a cylinder as an example, and divides the bottom surface contour of the standard cylinder into N parts (for convenience of explanation, only part of the specified contour point of the bottom surface contour of the cylinder is listed in FIG. 3B), and the aliquot is in advance. Let the projection point of the projection plane corresponding to the angle of view be determined as the specified contour point. For the convenience of viewing, the specified contour point is highlighted by using the dot. S _i is one of the equal points in the upper and lower contours of the cylinder figure, S _i ' is one of the equal points in the lower bottom contour of the cylinder figure, and O is the center point of the upper bottom contour in the cylinder figure.

In this embodiment, the sample length of the line segment formed by the specified contour point and the center point in the standard solid figure, and the sample angle of the line segment and the reference line may be determined according to the coordinates of the specified contour point and the coordinates of the center point. . Taking the specified contour point S _i as an example, the parameter specifying the contour point S _i includes the length of the line segment OS _i

And the angle θ _i and the line segment OS _i X axis, can be used {

θ _i } represents the parameter, 0 ≤ _i ≤ N.

The coordinates of the specified contour point can be obtained by the formula P _projection =P _{three-dimensional} *Mp, the Mp represents the projection matrix corresponding to the preset angle of view, the P _projection represents the coordinates of the specified contour point, and the P _{three-dimensional} represents the bisector coordinates.

The angle of the sample can also be called the projection angle. According to the vector product formula, we can know:

OS _i ·OX=|OS _i ||OX|·cosθ

Thereby, the sample angle θ _{i of the} line segment OS _i and the X axis can be obtained:

It can be seen that the parameters of each aliquot can be obtained {

θ _i }, where the coordinate of X can take a value of (1, 0).

Further, the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure further includes: drawing information required for drawing the bottom surface contour in the standard three-dimensional figure. If the standard three-dimensional body is a cylinder or a cone, draw information It may include the longest radius of the bottom surface profile in the standard solid figure and the length and extension direction of the shortest radius. If the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the drawing information may include the length and direction of the center point of the bottom surface contour in the standard solid figure to each vertex.

Taking a cylinder as an example, the shortest radius Min(Ri) and the longest radius Max(Ri) can also be determined according to the relationship between the coordinates of the specified contour point and the coordinates of the center point. As shown in Figure 3C.

As a preferred mode, the second two-dimensional coordinate system used by the standard solid figure and the standard three-dimensional figure satisfy that the longest radius coincides with one of the second two-dimensional coordinate systems, and the shortest radius and the second two-dimensional coordinate system The other coordinate axes coincide, and the center point of the bottom contour coincides with the origin of the second two-dimensional coordinate system, which can greatly reduce the calculation amount and save the calculation time. Wherein, if the longest radius and the shortest radius coincide with the coordinate axes respectively, the shortest radius may be referred to as a short axis radius, and the longest radius may also be referred to as a long axis radius.

If the standard three-dimensional body is a cylinder or a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the coordinates of the specified contour point in the upper bottom surface contour of the standard solid figure and the coordinates of the specified contour point in the lower bottom surface contour may be used. Determine the direction in which the side profile extends in the standard solid figure.

Since the upper bottom surface contour of the standard solid figure is parallel to the lower bottom surface contour, a line segment formed by a specified contour point and a lower contour contour in the upper bottom contour, and other specified contour points and lower bottom contours in the upper bottom contour The line segments formed by the corresponding contour points are parallel, so any line segment extends in the same direction as the side profile in the standard solid figure. For example, the direction of extension of the side profile in the standard solid figure can be determined from the coordinates of S _i and S _i '. As shown in FIG. 3B, the extending direction is the positive or negative direction of the Y-axis.

If the standard three-dimensional body is a cone, the extending direction of the contour bus bar of the standard three-dimensional figure can be determined based on the coordinates of the projection point in the bottom surface contour of the standard solid figure and the vertex coordinates of the standard solid figure.

Then, in order to facilitate understanding, the embodiment of the present invention introduces how to draw a stereoscopic graphic to be drawn in a drawing process with a specific application example. As shown in FIG. 3C, FIG. 3C is a schematic diagram of a cylindrical figure comparison according to an exemplary embodiment of the present invention. In the diagram, the first two-dimensional coordinate system used to draw the cylinder pattern satisfies the specified relationship with the second two-dimensional coordinate system used by the standard cylinder pattern.

In the mouse dragging process, the P1 point coordinates and the P2 point coordinates are obtained, and the P1 point coordinates and the P2 point coordinates are respectively taken as the center point coordinates and the contour point coordinates of the bottom surface contour in the solid figure to be drawn, and the P1 point coordinates correspond to the standard. The O point in the cylinder figure, in order to find the specified contour point corresponding to the P2 point in the standard cylinder figure, the angle ∠P2P1X of the line segment P2P1 and OX can be calculated, and the minimum gap from the 夹P2P1X is selected from the sample angle. The angle of the sample. Let α=∠P2P1X, then {Δi=|θi-α|, 0≤i≤N}, the ith projection point when Δi takes the minimum value is the projection point Si corresponding to the P2 point, and then determine the line segment Sample length corresponding to P2P1

At this point, the first scaling ratio k1 can be determined according to the following formula:

Then, the shortest radius and the longest radius in the drawing information are scaled based on the first scaling, obtaining the target short radius k1*Min(R _i ), and the target long radius k1*Max(R _i ); and using the target short radius K1*Min(R _i ) and the target long radius k1*Max(R _i ) are used to draw the bottom surface contour of the cylinder figure to be drawn, and the other surface contours are drawn by combining the P3 point coordinates and the extending direction of the side contours in the standard cylinder figure.

In the related art, a non-rotatable solid figure is often drawn by a two-dimensional drawing engine, for example, by a two-point method; a three-dimensional drawing engine can also be used to draw a stereoscopic graphic that can be rotated, for example, a user manually inputs a three-dimensional parameter of a three-dimensional figure, and three-dimensional drawing. The engine can draw the corresponding solid graphics. It can be understood that the two-dimensional drawing engine and the three-dimensional drawing engine draw a picture as a two-dimensional plan. The 2D drawing engine draws a solid figure with fixed projection conditions (preset angle of view) and therefore cannot be rotated. In the 3D drawing engine, the 3D drawing engine can draw stereoscopic graphics with different display angles according to the rotation operation instructions.

However, the two-dimensional drawing engine and the three-dimensional drawing engine are used independently, and it is impossible to realize the three-dimensional drawing engine to display the three-dimensional graphics and display the three-dimensional graphics in different display viewing angles. Users can only draw with the 2D drawing engine and 3D drawing engine respectively, which has low drawing efficiency and poor user experience.

To this end, an embodiment of the present invention further provides a method for determining a three-dimensional parameter, the method:

S1: determining, according to the distance between the second point coordinate and the third point coordinate, and the length and the extending direction of the side contour in the standard solid figure, determining a second zoom of the side contour of the solid figure to be drawn relative to the side contour of the standard solid figure proportion.

Wherein, the projection distance of the second point coordinate and the third point coordinate in the extending direction may be determined, and the projection distance may be compared with the length of the side contour in the standard solid figure, and the side contour of the solid figure to be drawn may be obtained relative to the standard solid figure. The second scale of the side profile.

S2: Obtain a three-dimensional parameter required when drawing the standard solid figure by using a three-dimensional drawing engine.

Wherein, if the standard three-dimensional body is a cylinder or a cone, the three-dimensional parameters required to draw the standard solid figure by using the three-dimensional drawing engine include the radius of the cylinder or the radius of the bottom surface of the cone and the height of the cylinder or the cone. If the standard three-dimensional body is a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the standard three-dimensional graphics are drawn by using a three-dimensional drawing engine. The three-dimensional parameters required when the cylinder is included may be the length of the ridge. For example, when the cylinder is a cylinder with a square bottom surface, the three-dimensional parameter may be the length of the bottom side and the height.

S3: Scaling the three-dimensional parameter based on the first scaling ratio and the second scaling ratio.

Wherein, the bottom surface three-dimensional parameter of the three-dimensional body can be scaled by using the first scaling ratio, and the height of the three-dimensional body is scaled by the second scaling ratio.

Taking a cylinder as an example, assume that the radius of the bottom surface of the standard cylinder is R0 and the height is H0. The first scaling ratio is

The second scaling is

Then, the three-dimensional parameters of the cylinder corresponding to the cylinder pattern to be drawn are: the radius of the bottom surface is R=R0*k1, and the height is H=H0*k2.

S4: Input the 3D parameters obtained by the zoom into the 3D drawing engine.

In view of this, the three-dimensional drawing engine may draw the stereoscopic graphics to be drawn according to the three-dimensional parameters obtained by the scaling; receive a rotation operation instruction for the stereoscopic graphics to be drawn; and transform the corresponding corresponding to the stereoscopic graphics to be drawn according to the rotation operation instruction. a viewing angle of the three-dimensional body; drawing a three-dimensional figure of the three-dimensional body at the viewing angle of the display.

It can be seen that, according to the change of the display angle of view, the embodiment of the present invention draws the stereoscopic graphics under the changed viewing angle in real time, and the display of the stereoscopic graphics is more intuitive and the user experience is better.

The various technical features in the above embodiments may be arbitrarily combined, as long as there is no conflict or contradiction between the combinations of the features, but the description is not limited, and thus the various technical features in the above embodiments are combined arbitrarily. It also falls within the scope of this specification.

As shown in FIG. 4, FIG. 4 is a flowchart of another method for drawing a solid figure according to an exemplary embodiment of the present invention, the method includes the following steps:

In step 401, a first point coordinate and a second point coordinate are acquired.

In step 402, a target length of the target line segment formed by the first point coordinate and the second point coordinate, and a target angle of the target line segment and the preset reference line are calculated.

In step 403, from the preset correspondence, the angle between the samples having the smallest angle with the target is selected.

Wherein, the correspondence between the sample length and the sample angle is pre-configured, and the sample length is the length of the line segment formed by the specified contour point and the center point on the bottom surface contour in the standard solid figure, and the sample angle is the line segment and the The angle between the reference lines.

In step 404, the target length is compared with the sample length corresponding to the angle of the selected sample, and is obtained. A first scaling ratio of the bottom surface contour of the solid figure relative to the bottom surface contour of the standard solid figure is drawn.

In step 405, the bottom surface contour of the stereoscopic graphic to be drawn is drawn according to the first point coordinate, the second point coordinate, and the first scaling.

In step 406, the third point coordinates are acquired.

In an example, after step 406 is performed, step 407 may be performed, or step 408 may be performed. There is no sequence of execution between step 407 and step 408. Step 407 may be performed first, and then step 408 may be performed. Step 408 may be performed first, and then step 407 is performed, and no limitation is imposed here. In one example, step 406 can be to perform step 407 and perform the triggering condition of step 408. In another example, step 407 can be to perform the trigger condition of step 408, and the like.

In step 407, the contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.

In step 408, determining the side contour of the solid figure to be drawn relative to the side contour of the standard solid figure according to the distance between the second point coordinate and the third point coordinate, and the length and the extending direction of the side contour in the standard solid figure. The second scaling.

In step 409, three-dimensional parameters required to draw the standard solid figure using the three-dimensional drawing engine are obtained.

The order of execution of step 409 and

steps

407 and 408 may not be limited. In an example, step 407 may be used as the trigger condition of step 409, that is, after drawing the contours of other faces in the stereogram to be drawn, step 409 is performed; in another example, step 408 may be used as the trigger condition of step 409. That is, after the second scaling is determined, step 409 and the like are performed, and other conditions may be used as the triggering conditions for performing step 409, which are not enumerated here.

In step 410, the three-dimensional parameter is scaled based on the first scaling ratio and the second scaling ratio.

The step 404 is to obtain the first zoom ratio, the step 408 is to obtain the second zoom ratio, and when the step 409 obtains the three-dimensional parameter, step 410 can be performed.

In step 411, the three-dimensional parameters obtained by the scaling are input to the three-dimensional drawing engine.

The steps 401 to 411 are the same as the related technologies of the foregoing steps 201 to 204 and 301 to 304, and are not further described herein.

It can be seen from the above embodiment that the present embodiment draws a bottom surface contour of the three-dimensional figure by two points, and draws other surface contours of the three-dimensional figure through the third point, thereby realizing the drawing of the three-dimensional figure, since the user can control the three-dimensional figure through two points. The size of the bottom surface, through the third point to control the other contours in the solid figure, so you can actively respond to drawing instructions. Draw the three-dimensional graphics that the user expects to draw, and improve the accuracy of drawing the stereoscopic graphics. Moreover, according to the drawn cube graphic, the three-dimensional size of the corresponding three-dimensional body can be obtained, and the three-dimensional size is transmitted to the three-dimensional drawing engine, and the three-dimensional drawing is used to draw the three-dimensional body in various angles, and the two-dimensional drawing tool and the three-dimensional drawing are realized. The combination of engines.

Corresponding to the embodiment of the aforementioned stereoscopic graphics rendering method, the present invention also provides a stereoscopic graphics rendering device, an electronic device to which the device is applied, and an embodiment of a computing storage medium.

Embodiments of the stereoscopic graphics rendering apparatus of the present invention can be applied to computer equipment. The device embodiment may be implemented by software, or may be implemented by hardware or a combination of hardware and software. Taking the software implementation as an example, as a logical means, a processor drawn by the stereoscopic graphics is formed by reading a corresponding computer program instruction in the non-volatile memory into the memory. From the hardware level, as shown in FIG. 5, it is a hardware structure diagram of a computer device where the stereoscopic graphics drawing device of the present invention is located, except for the processor 510, the memory 530, the network interface 520, and the nonvolatile memory shown in FIG. 5. In addition to the memory 540, the computer device in which the device 531 is located in the embodiment may further include other hardware according to the actual function of the server, and details are not described herein again.

As shown in FIG. 6 , FIG. 6 is a block diagram of a stereoscopic graphics rendering apparatus according to an exemplary embodiment of the present invention. The apparatus includes a coordinate acquiring module 610 , a scaling determining module 620 , and a graphics rendering module 630 .

The coordinate acquiring module 610 is configured to acquire first point coordinates, second point coordinates, and third point coordinates.

The ratio determining module 620 is configured to respectively use the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the stereoscopic graphic to be drawn, and combined with the bottom surface contour of the preset standard three-dimensional graphic The relationship between the contour point and the center point is specified, and the first scaling ratio of the bottom surface contour of the solid figure to be drawn with respect to the bottom surface contour of the standard solid figure is determined.

a graphic drawing module 630, configured to draw a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio; a distance according to the second point coordinate and the third point coordinate, and an extending direction of the side contour in the standard solid graphic , draw the outline of the other faces in the stereogram to be drawn.

In an optional implementation manner, the apparatus further includes a relationship determining module (not shown in FIG. 6), where the relationship determining module is configured to:

The bottom surface contour of the standard three-dimensional body is equally divided to obtain at least two halving points.

Determining, according to a projection matrix corresponding to the preset viewing angle, a projection point of the projection plane corresponding to the projection plane corresponding to the preset viewing angle, and a projection point of the projection plane corresponding to the center of the standard three-dimensional body at the preset viewing angle, The projection point corresponding to the point is determined as the specified contour point, and the projection point corresponding to the center is determined as the center point.

In an optional implementation manner, the ratio determining module 620 includes:

The information calculation sub-module is configured to calculate a target length of the target line segment formed by the first point coordinate and the second point coordinate, and a target angle between the target line segment and the reference line.

The angle screening sub-module is configured to filter, from the angle of the sample, a sample angle that is the smallest difference from the target angle.

The ratio determining sub-module is configured to obtain a first scaling ratio of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid graphic by comparing the target length with a sample length corresponding to the selected sample angle.

In an optional implementation manner, the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure further includes: drawing information required to draw the bottom surface contour in the standard three-dimensional graphic; The standard three-dimensional body is a cylinder or a cone, and the drawing information includes a longest radius of the bottom surface contour and a length and an extending direction of the shortest radius in the standard solid figure; if the standard three-dimensional body is two bottom surfaces parallel and two bottom surfaces For a cylinder of the same regular polygon, the rendering information includes the length and direction of the center point to the vertices of the bottom surface contour in the standard solid figure.

The graphic drawing module is specifically configured to: scale the length in the drawing information based on the first scaling ratio. The bottom surface contour of the stereoscopic graphic to be drawn is drawn by the length obtained by the scaling and the direction in the drawing information.

In an optional implementation manner, if the standard three-dimensional body is a cylinder or a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the apparatus further includes a first direction determining module (not shown in FIG. 6). And for determining an extension direction of the side contour in the standard solid figure based on coordinates of the specified contour point in the upper bottom surface contour of the standard solid figure and coordinates of the specified contour point in the lower bottom surface contour.

In an optional implementation, if the standard three-dimensional body is a cone, the device further includes a second direction determining module (not shown in FIG. 6) for: based on the bottom surface contour in the standard solid graphic Specify the coordinates of the contour point to And the vertex coordinates of the standard solid figure determine the extending direction of the contour bus bar in the standard solid figure.

In an optional implementation manner, the apparatus further includes a parameter acquisition module, a parameter scaling module, and a parameter transmission module (not shown in FIG. 6).

The ratio determining module is further configured to determine, according to the distance between the second point coordinate and the third point coordinate, and the length and the extending direction of the side contour in the standard solid figure, the side contour of the solid graphic to be drawn is relative to the standard The second scaling of the side profile of the solid figure.

A parameter acquisition module is configured to acquire a three-dimensional parameter required when the standard three-dimensional graphic is drawn by using a three-dimensional drawing engine.

And a parameter scaling module, configured to scale the three-dimensional parameter based on the first scaling ratio and the second scaling ratio.

A parameter transmission module for inputting the three-dimensional parameters obtained by the scaling into the three-dimensional drawing engine.

In an optional implementation, the apparatus further includes:

And a drawing module, configured to draw the stereoscopic graphic to be drawn by using the three-dimensional parameters obtained by the scaling based on the three-dimensional drawing engine.

And an instruction receiving module, configured to receive a rotation operation instruction for the stereoscopic graphic to be drawn.

The angle of view determining module is configured to transform a display angle of view of the three-dimensional body corresponding to the to-be-drawn three-dimensional figure according to the rotation operation instruction.

The drawing module is further configured to draw a three-dimensional figure of the three-dimensional body in the display viewing angle.

Accordingly, the present invention also provides an electronic device, the device comprising a processor; a memory for storing processor-executable instructions; wherein the processor is configured to:

Get the first point coordinate, the second point coordinate, and the third point coordinate.

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure The relationship determines a first scaling of the bottom surface contour of the solid graphics to be drawn relative to the bottom surface contour of the standard solid graphics.

Drawing a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio.

Further, the electronic device can be a smart tablet, such as a Xiwo interactive smart tablet.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, where the storage medium stores program instructions, where the program instructions include:

Embodiments of the invention may take the form of a computer program product embodied on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which program code is embodied. Computer-usable storage media include both permanent and non-persistent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory. (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disk read only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, Magnetic tape cartridges, magnetic tape storage or other magnetic storage devices or any other non-transportable media can be used to store information that can be accessed by a computing device.

For the device embodiment, since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment. The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, ie may be located A place, or it can be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the present invention. Those of ordinary skill in the art can understand and implement without any creative effort.

Other embodiments of the invention will be apparent to those skilled in the <RTIgt; The present invention is intended to cover any variations, uses, or adaptations of the present invention, which are in accordance with the general principles of the invention and include common general knowledge or conventional technical means in the art that are not claimed. . The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the invention Out.

It is to be understood that the invention is not limited to the details of the details of The scope of the invention is limited only by the appended claims.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

A method for drawing a three-dimensional figure, the method comprising:

Obtaining a first point coordinate, a second point coordinate, and a third point coordinate;

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure a relationship determining a first scaling ratio of a bottom surface contour of the solid graphics to be drawn with respect to a bottom surface contour of the standard solid graphics;

Drawing a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio;

The contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.
The method according to claim 1, wherein the standard three-dimensional figure is a graphic showing a standard three-dimensional body on a two-dimensional plane, the standard three-dimensional body comprising a cylinder, a cone, or two bottom surfaces. Parallel and two bottom surfaces are the same regular polygonal cylinder. If the standard three-dimensional body is a cylinder or a cone, the side contour is a contour bus; if the standard three-dimensional body is two bottom surfaces parallel and the two bottom surfaces are the same regular polygon The column has a side profile which is a side ridge.
The method according to claim 2, wherein the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure comprises: a correspondence between a sample length and a sample angle, the sample length It is the length of the line segment formed by the specified contour point and the center point in the standard solid figure, and the sample angle is the angle between the line segment and the preset reference line.
The method according to claim 3, wherein the determining step of the correspondence between the sample length and the angle of the sample comprises:

Dividing the bottom surface contour of the standard three-dimensional body to obtain at least two equal points;

Determining, according to a projection matrix corresponding to the preset viewing angle, a projection point of the projection plane corresponding to the projection plane corresponding to the preset viewing angle, and a projection point of the projection plane corresponding to the center of the standard three-dimensional body at the preset viewing angle, The projection point corresponding to the point is determined as the specified contour point, and the projection point corresponding to the center is determined as the center point;

And determining, according to the determined specified contour point and the center point, a sample length of the line segment formed by the specified contour point and the center point in the standard solid figure, and an angle between the line segment and the sample line of the reference line.
The method according to claim 3, wherein the first point coordinate and the second point coordinate are respectively used as a center point coordinate and a contour point coordinate of a bottom surface contour in the solid figure to be drawn, and combined with the preset The relationship between each specified contour point and the center point on the bottom surface contour of the standard solid figure determines the first scaling ratio of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid graphic, including:

Calculating a target length of the target line segment formed by the first point coordinate and the second point coordinate, and a target angle between the target line segment and the reference line;

From the angle of the sample, the angle between the samples having the smallest angle with the target is selected;

Comparing the target length with the sample length corresponding to the selected sample angle, obtaining a first scaling ratio of the bottom surface contour of the solid image to be drawn relative to the bottom surface contour of the standard solid image.
The method according to claim 3, wherein the relationship between each specified contour point and the center point on the bottom surface contour of the preset standard solid figure further comprises: drawing required to draw the bottom surface contour in the standard solid figure Information; if the standard three-dimensional body is a cylinder or a cone, the drawing information includes a longest radius of the bottom surface contour and a length and an extension direction of the shortest radius in the standard solid figure; if the standard three-dimensional body is two bottom surfaces Parallel and two bottom surfaces are cylinders of the same regular polygon, and the drawing information includes a length from a center point of the bottom surface contour of the standard solid figure to each vertex;

The drawing the bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio includes:

Scaling the length in the rendering information based on the first scaling ratio;

The bottom surface contour of the stereoscopic graphic to be drawn is drawn by the length obtained by the scaling and the direction in the drawing information.
The method according to claim 2, wherein if the standard three-dimensional body is a cylinder or a cylinder whose two bottom surfaces are parallel and the two bottom surfaces are the same regular polygon, the extending direction of the side contour in the standard three-dimensional figure is determined. The steps include:

Determining an extension direction of the side contour in the standard solid figure based on coordinates of the specified contour point in the upper bottom surface contour of the standard solid figure and coordinates of the specified contour point in the lower bottom surface contour;

If the standard three-dimensional body is a cone, the determining step of the extending direction of the side profile in the standard three-dimensional figure includes:

Determining the extending direction of the contour bus bar in the standard solid figure based on the coordinates of the specified contour point in the bottom surface contour in the standard solid figure and the vertex coordinates of the standard solid figure.
The method according to any one of claims 1 to 7, wherein the method further comprises:

Determining, according to the distance between the second point coordinate and the third point coordinate, and the length and the extending direction of the side contour in the standard solid figure, a second scaling ratio of the side contour of the solid figure to be drawn relative to the side contour of the standard solid figure;

Obtaining three-dimensional parameters required to draw the standard solid figure using a three-dimensional drawing engine;

And scaling the three-dimensional parameter based on the first scaling ratio and the second scaling ratio;

Enter the 3D parameters obtained by scaling into the 3D drawing engine.
The method of claim 8 further comprising:

And drawing, according to the three-dimensional drawing engine, the three-dimensional parameters obtained by the scaling, the three-dimensional graphics to be drawn;

Receiving a rotation operation instruction for the stereoscopic graphic to be drawn;

Converting a display angle of view of the three-dimensional body corresponding to the stereoscopic graphic to be drawn according to the rotation operation instruction;

A three-dimensional figure of the three-dimensional body at the display viewing angle is drawn.
A stereoscopic graphics drawing device, characterized in that the device comprises:

a coordinate acquiring module, configured to acquire a first point coordinate, a second point coordinate, and a third point coordinate;

a ratio determining module, configured to respectively use the first point coordinate and the second point coordinate as a center point coordinate and a contour point coordinate of a bottom surface contour in the stereoscopic graphic to be drawn, and combined with each of the preset bottom surface contours of the standard three-dimensional graphic a relationship between the contour point and the center point, determining a first scaling ratio of the bottom surface contour of the solid graphics to be drawn relative to the bottom surface contour of the standard solid graphics;

a graphic drawing module, configured to draw a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio; a distance according to the second point coordinate and the third point coordinate, and an extending direction of the side contour in the standard solid graphic, Draw the outline of the other faces in the perspective view to be drawn.
An electronic device, comprising:

processor;

a memory for storing processor executable instructions;

Wherein the processor is configured to:

Obtaining a first point coordinate, a second point coordinate, and a third point coordinate;

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure a relationship determining a first scaling ratio of a bottom surface contour of the solid graphics to be drawn with respect to a bottom surface contour of the standard solid graphics;

Drawing a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio;

The contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.
The electronic device according to claim 11, wherein the electronic device is a smart tablet.
A computer storage medium, wherein the storage medium stores program instructions, and the program instructions include:

Obtaining a first point coordinate, a second point coordinate, and a third point coordinate;

Taking the first point coordinate and the second point coordinate as the center point coordinate and the contour point coordinate of the bottom surface contour in the solid figure to be drawn, respectively, and combining the specified contour point and the center point on the bottom surface contour of the preset standard three-dimensional figure a relationship determining a first scaling ratio of a bottom surface contour of the solid graphics to be drawn with respect to a bottom surface contour of the standard solid graphics;

Drawing a bottom surface contour of the stereoscopic graphic to be drawn based on the first scaling ratio;

The contours of the other faces in the stereogram to be drawn are drawn according to the distance between the second point coordinate and the third point coordinate, and the extending direction of the side contour in the standard solid figure.