JP2016076017A - Graphic processing device and graphic processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a graphic processing device and graphic processing program that allow an operation capable of sharing an existing typical operation in a two-dimensional spatial display to select and rotate a rotation axis.SOLUTION: A graphic processing device setting a three-dimensional space on a display area of a two-dimensional area and displaying an object on the display area comprises: an input unit that receives a touch operation to the display area by a user as an input, and acquires information on a position of a first input point whose start is first to come when two inputs are started, a position of a second input point whose start comes after the first input point, and a position where the second input point is dragged; a rotation axis determination unit that determines a rotation axis for executing a rotation of a view point in the three-dimensional space on the basis of a position relation between the first input point and the display area; and a rotation execution determination unit that determines a rotation direction on the basis of a drag direction of the second input point.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a graphic processing apparatus and a graphic processing program.

  There are applications that display a three-dimensional space in a two-dimensional area. Conventionally, the display of a three-dimensional space is used only in a specialized area that actually handles a three-dimensional object. For example, shape modeling (cars, buildings, precision instrument parts, etc.) and medical data display (built-in 3D image display, etc.).

  In a three-dimensional space display for professionals, the operation method may be learned at a high cost, and multifunctionality and accuracy are more important than intuitive operation.

  From now on, it is expected that the display of the three-dimensional space will be widespread for users who are not familiar with the operation of the three-dimensional space. For example, a web service that displays power consumption for each city overlaid on a map, or an in-store system that visually displays sales status and transition information for each shelf row or column on a 3D map in the store. is there.

  In order for the user to grasp the three-dimensional space, it is necessary to move the viewpoint and view it from various positions and directions, and one of the operations for that purpose is an operation of rotating the viewpoint. There is a mechanism that allows the user to specify an arbitrary rotation axis so that the system can determine the rotation axis based on the input operation from the user and rotate the viewpoint in all directions, but the rotation axis that can achieve the desired rotation It is difficult for an unfamiliar user to specify correctly. This is partly because the rotation of the viewpoint in the three-dimensional space must be instructed by the input to the two-dimensional region.

  For example, the rotation of the viewpoint in the three-dimensional space is instructed by the locus of mouse drag on the two-dimensional area. In view of this, a method of rotating the viewpoint by repeatedly selecting and rotating one of the x-axis, y-axis, and z-axis explicitly as a rotation axis is also used.

  However, by limiting the selectable rotation axes, it is possible to realize rotation that is easy for the user to understand. On the other hand, by limiting the selectable rotation axes, the position of the viewpoint that can be moved by one rotation is limited. . In addition, the number of rotations required to realize rotation of an arbitrary viewpoint is increased compared with a case where selectable rotation axes are not limited, which takes time and effort for the user.

  As described above, the method of selecting the rotation axis from the limited candidates cannot select the rotation axis unless a point operation is performed at a specific point within a narrow range. There is a problem that visual display is essential.

Blender 3D modeling software http://blender.jp/modules/docs/index.php

JP-A-9-185455

  A problem to be solved by the present invention is to provide a graphic processing apparatus and a graphic processing program capable of selecting and rotating a rotation axis by an operation that can be used in combination with an existing representative operation in the display of a two-dimensional space. It is to be.

  The graphic processing device of the embodiment is a graphic processing device that sets a three-dimensional space on a display region of a two-dimensional region and displays an object on the display region, and receives a touch operation of the display region by a user as an input When the two inputs are started, the position of the first input point that starts earlier, the position of the second input point that starts later than the first input point, and the position of the second input point An input unit that acquires information on a position during dragging, and a rotation axis determination unit that determines a rotation axis for executing rotation of the viewpoint in a three-dimensional space based on the positional relationship between the first input point and the display area A rotation that determines execution of rotation on the rotation axis based on a positional relationship between the first input point and the second input point, and determines a rotation direction based on a drag direction of the second input point. An execution determination unit.

It is a block diagram which shows schematic structure of the graphics processing apparatus which concerns on embodiment of this invention. It is a figure explaining each part of a display area. It is a figure explaining an example which provided the non-reaction part in the display area. It is a flowchart which shows the flow of the process in the 1st method of rotation axis determination. It is a figure explaining the vertical relationship of an input point, and the horizontal relationship of an input point. It is a flowchart which shows the flow of a process in the 2nd method of rotation axis determination. It is a figure explaining the execution determination of rotation. It is a figure explaining the execution determination of rotation. It is a figure explaining determination of a rotation direction. It is a figure explaining determination of the rotation direction in case a rotation axis is an x-axis. It is a figure explaining determination of the rotation direction in case a rotation axis is a y-axis. It is a flowchart which shows the flow of the process of rotation execution determination in a rotation execution determination part, and a rotation direction determination. It is a figure explaining the change of a rotation direction. It is a figure explaining the selection cancellation | release of a rotating shaft. It is a figure explaining the precondition in a present Example. It is explanatory drawing which applies the rotating shaft determination method (1) using the positional relationship of a 1st input point and a display area in a present Example. It is explanatory drawing which applies the rotating shaft determination method (2) using the positional relationship of a 1st input point and a 2nd input point in a present Example. It is a figure explaining the relationship between the minor angle (theta) ₂ and threshold value (alpha) and (beta) in a present Example. In the present embodiment, it is a diagram illustrating drawing by rotating the viewpoint 22.5 degrees to the left about the rotation axis y. It is a figure explaining the modification 1 of this embodiment. It is a figure explaining the modification 2 of this embodiment. It is a figure explaining the modification 3 of this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  First, main terms used in the present embodiment will be described.

  “Display area” refers to a two-dimensional area displaying a three-dimensional space on the screen. In the display area, the content of a three-dimensional space projected from a certain viewpoint in the space onto a two-dimensional plane is drawn. What two-dimensional plane is projected depends on the application.

  “Viewpoint” means what determines where and in what direction the space is viewed. If the viewpoint position and the viewpoint direction are changed, an object in the three-dimensional space can be seen from different angles.

  “Rotation of viewpoint” refers to one of movements for changing the position of the viewpoint and the direction of the viewpoint. When the viewpoint v1 is moved to the position v2 while maintaining the distance from the point c with respect to the viewpoint facing the arbitrary point c in the three-dimensional space, the point c is referred to as a rotation center point. A straight line that intersects perpendicularly to a plane including the three points c, v1, and v2 and passes through the point c is called a rotation axis. In this embodiment, for convenience of explanation, it is assumed that the rotation center point c is the origin (0,0,0) of the three-dimensional space. Although the rotation center point c may not be the origin, there is no problem if the coordinate system is the same.

  There are right rotation (counterclockwise) and left rotation (clockwise) of the viewpoint with respect to the rotation axis, and the rotation direction of the viewpoint is opposite to the rotation direction of the object in the three-dimensional space drawn in the display area. For example, when the viewpoint is rotated to the right about the rotation axis, the appearance in the display area appears as if the object has rotated left about the rotation axis.

  “Tap” is one type of user input to the display area, and means an operation of tapping the screen with a touch interface type terminal. Corresponding to a mouse operation click, tapping twice in a short time is called “double tap”, and tapping only once is sometimes called “single tap”.

  “Drag” is one type of user input to the display area and means moving on the screen while pressing a button or a finger when tapping. Sometimes it is simply held down rather than moved.

  “Pinch-in” refers to an operation in which two inputs are simultaneously performed with two fingers on the display area, and the screen is pinched to reduce the screen.

  “Pinch out” refers to an operation that simultaneously performs two inputs with two fingers on the display area, moves the screen to expand, and enlarges the screen.

  “Input point” refers to the point position when tapping or dragging in the display area.

  "First input point, second input point" means that when two inputs are started, the first input point is the input point that starts earlier, and the second input point is the input point that starts later It is.

“Inferior angle” refers to the smaller angle formed by two line segments or half lines having intersections on a plane. The minor angle is larger than 0 ° and smaller than 180 °.

  In the present embodiment, (1) the rotation axis for executing the rotation of the viewpoint in the three-dimensional space is determined from the positional relationship between the first input point and the display area, and (2) the first input point and the second input point. The rotation axis is determined based on any one of the drag start positions, and it is determined whether or not to rotate based on the positional relationship between the first input point and the second input point. From the drag direction of the second input point Determine the direction of rotation.

  In this embodiment, the up / down / left / right drag in the display area is basically an operation for parallel movement, and the pinch-in / pinch-out is an operation for reduction / enlargement. The rotation center point is determined in advance by the user, and the z-axis is not considered as the rotation axis, and either the x-axis or the y-axis is selected as the rotation axis and rotated.

  FIG. 1 is a block diagram showing a schematic configuration of a graphic processing apparatus according to an embodiment of the present invention. This apparatus is realized using a general-purpose computer (for example, a personal computer (PC) or the like) and software operating on the computer. The computer includes an engineering workstation (EWS) suitable for CAD (Computer Aided Design) and CAE (Computer Aided Engineering). In this embodiment, in this computer, either (1) determined based on the positional relationship between the first input point and the display area, or (2) determined based on the positional relationship between the first input point and the second input point. It is also possible to determine the rotation axis according to the above, determine whether to rotate from the positional relationship between the first input point and the second input point, and implement as a program for determining the rotation direction from the drag direction of the second input point. it can.

  As shown in FIG. 1, the graphics processing apparatus 1 according to the present embodiment mainly includes an input unit 10, a rotation axis determination unit 20, a rotation axis selection release unit 30, a rotation execution determination unit 40, and a drawing instruction unit. 50, a rotation axis information storage unit 60, and a drawing unit 70.

  The input unit 10 receives a touch interface type input, and is configured by, for example, a capacitive touch panel. The screen touch operation of the user is input, and the position of the first input point and the second input point, which is the input point whose input starts later than the first input point, is acquired. The input unit 10 acquires the dragged position while the second input point is being dragged. Furthermore, the input unit 10 detects that the pressing of the first input point has been released. The input unit 10 outputs information on the position of the first input point, the position where the second input point is being dragged, and the first input point pressing release notification.

  The rotation axis determination unit 20 acquires information on the position of the first input point and the position during dragging of the second input point from the input unit 10, and executes rotation of the viewpoint in the three-dimensional space by any of the following methods. Determine the axis of rotation. Details of the determination method will be described later.

(1) Determination of rotation axis based on positional relationship between first input point and display area (2) Determination of rotation axis based on positional relationship between drag start position of first input point and second input point The rotation axis determination unit 20 rotates It has selected rotation axis information of “none”, “x axis”, and “y axis” regarding the axis. The rotation axis determination unit 20 outputs the selected rotation axis information determined in any of the above to the rotation axis information storage unit 60, and updates the selected rotation axis information already stored. The initial value of the selected rotation axis information is “none” until the user selects a rotation axis.

  The rotation axis selection cancellation unit 30 acquires information on the release cancellation notification of the first input point from the input unit 10 and updates the selected rotation axis information stored in the rotation axis information storage unit 60 to “none”.

  The rotation execution determination unit 40 obtains information on the position of the first input point and the position where the second input point is being dragged from the input unit 10, and selects the selected rotation axis information stored in the rotation axis information storage unit 60. refer. When the selected rotation axis information is not “none”, the object to be drawn is “rotated” when a predetermined determination condition described later is satisfied based on the positional relationship between the first input point and the second input point. If the determination condition is not satisfied, it is determined that “no rotation”. Details of the rotation execution determination will be described later. If the selected rotation axis information is “none”, it is determined that the rotation axis is not selected.

  Furthermore, the rotation execution determination unit 40 determines the rotation direction according to the drag direction of the second input point. When the rotation execution determination unit 40 determines to “rotate”, the rotation execution determination unit 40 outputs the rotation direction, the selected rotation axis information, and the information on the position of the second input point being dragged.

  The drawing instruction unit 50 receives the rotation direction, selected rotation axis information, and information on the position where the second input point is being dragged from the rotation execution determination unit 40, and is a method preset by the system designer. The rotation angle of the object to be drawn is calculated using the position being dragged. Here, the rotation angle can be calculated from the difference in the y-axis direction between any two points in the two-dimensional coordinates of the display area, for example, where the rotation axis is the x-axis.

  Further, the drawing instruction unit 50 instructs to draw an object in a three-dimensional space that is rotated by the calculated rotation angle in the rotation direction with the axis recorded in the selected rotation axis information as the rotation axis. It is preferable not only to rotate the object but also to instruct drawing in order to reflect changes in the object and the viewpoint in the three-dimensional space, such as zooming in / out of the viewpoint, parallel movement, and movement of the object.

  The rotation axis information storage unit 60 stores selected selected rotation axis information. The initial value is “none”.

  The drawing unit 70 acquires information on the object to be drawn, specifications of the display area, etc., receives an instruction from the drawing instruction unit 50, and finally rotates the viewpoint to a two-dimensional plane in the three-dimensional space. Is displayed in the display area.

  Next, each process of determination of a rotation axis, determination of execution of rotation, and determination of a rotation direction in the graphic processing apparatus 1 configured as described above will be described in detail.

<Determination of rotation axis>
FIG. 2 is a diagram for explaining each part of the display area. In the present embodiment, the display area is divided into four areas, an upper part and a lower part, as shown in FIG. 2A, and a left part and a right part, as shown in FIG. 2B. The user can set how to divide into four. In addition, you may set the part which does not react to the touch operation from a user other than an upper part, a lower part, a left part, and a right part in a display area. FIG. 3 is a diagram illustrating an example in which a non-reactive portion is provided in the display area.

(First method for determining the rotation axis)
In the first method of determining the rotation axis,
(1) If the position of the first input point is located at the top or bottom of the display area, the “y-axis” is determined as the rotation axis, and the position of the first input point is located at the left or right part of the display area. If so, the “x-axis” is determined as the rotation axis.

  FIG. 4 is a flowchart showing the flow of processing in the first method for determining the rotation axis.

  First, for the position of the first input point acquired in the input unit 10, the rotation axis determination unit 20 calculates whether it is located in the upper part, the lower part, the left part, the right part, or the no-reaction part in the display area ( Step S41).

  Next, it is determined whether or not the position of the first input point is a non-reactive part (step S42).

  If the position of the first input point is a non-reactive part (Yes in step S42), the process of the first method for determining the rotation axis is terminated, and the position of the first input point is not a non-reactive part (step S42). No), it is determined whether or not the position of the first input point is the upper part or the lower part (step S43).

  If the position of the first input point is upper or lower (Yes in step S43), the selected rotation axis information is updated with “y axis” (step S44), and the process of the first method for determining the rotation axis is completed. .

  On the other hand, if the position of the first input point is not the upper part or the lower part (No in step S43), the selected rotation axis information is updated with “x axis” (step S45), and the process of the first method for determining the rotation axis is performed. finish.

(Second method for determining the rotation axis)
In the second method of determining the rotation axis,
(2) If the position of the first input point and the drag start position of the second input point are in a “vertical relationship”, “y-axis” is set, and if in the “lateral relationship”, the “x-axis” is set as a rotation axis. decide. Note that a known method can be applied to determine that the input operation by the user is a drag operation.

FIG. 5 is a diagram for explaining the vertical relationship between input points and the horizontal relationship between input points. FIG. 5A shows a case where two input points are in a vertical relationship, and FIG. 5B shows a case where two input points are in a horizontal relationship. As shown in FIG. 5, consider straight whether narrow angle theta ₁ of the aspect of the border made of the display area is determined condition that the threshold a following through the two input points.

When the vertical frame line satisfies the determination condition (see FIG. 5A), the two input points are assumed to be in a vertical relationship, and the rotation axis is determined as the y axis. In the following description, when two input points are in a vertical relationship, the angle θ ₁ = V is expressed.

On the other hand, when the horizontal frame line satisfies the determination condition (see FIG. 5B), the two input points are assumed to have a horizontal relationship, and the rotation axis is determined as the x axis. In the following description, when two input points are in a lateral relationship, the angle θ ₁ = H is described. When neither frame line satisfies the determination condition, it is considered that the rotation axis is not selected.

  The above threshold value a is set in advance by the user. For example, the threshold value a = 30 °.

  FIG. 6 is a flowchart showing the flow of processing in the second method for determining the rotation axis.

  First, with respect to the position of the first input point acquired by the input unit 10 and the position during dragging of the second input point, the rotation axis determination unit 20 is a straight line passing through the drag start position of the first input point and the second input point. The narrower angle V formed by the vertical frame line of the display area and the narrower angle H formed by the horizontal frame line of the display area are calculated (step S61).

  Next, it is determined whether or not V <H for the calculated two angles (step S62).

  If V <H (Yes in step S62), the threshold value a is compared with the magnitude to determine whether V <= a (step S63).

  If V <= a (No in step S63), the process of the second method for determining the rotational axis is terminated. If V <= a (Yes in step S63), the selected rotational axis information is set to “y-axis”. ”(Step S64), and the process of the second method for determining the rotation axis is completed.

  On the other hand, if V <H is not satisfied (No in step S62), it is determined whether V> H is satisfied (step S65).

  If V> H is not satisfied (No in step S65), the process of the second method for determining the rotation axis is terminated. If V> H is satisfied (Yes in step S65), it is determined whether H <= a. (Step S66).

  If it is not H <= a (No in step S66), the process of the second method for determining the rotational axis is terminated. If H <= a (Yes in step S66), the selected rotational axis information is set to “x-axis”. ”(Step S67), and the process of the second method for determining the rotation axis is completed.

  As described above, when the rotation axis is selected as described above, the user can grasp (recognize) the x-axis or the y-axis, for example, as follows.

(1) The rotation axis is drawn on the display area as auxiliary information. (2) The text indicating the rotation axis is displayed somewhere inside or outside the display area.
In the present embodiment, it is determined from the positional relationship between the first input point and the second input point whether or not the object is rotated on the rotation axis (that is, the viewpoint is rotated). 7 and 8 are diagrams for explaining the execution determination of rotation. As shown in FIG. 7, the drag start position of the second input point is P _0, and the position of the second input point at the time when the n-th process during the drag is performed is P n. The positions of the first input point and the second input point are not limited as long as they are within the display area.

As shown in FIG. 8, a line segment SL1 connecting the position of the first input point and the dragging position Pn-1 of the second input point, and a line segment connecting the positions Pn-1 and Pn of the second input point dragging. Regarding SL2, let us consider an inferior angle θ _{2 formed} by two line segments SL1 and SL2.

In this embodiment, when the recessive angle θ ₂ is equal to or larger than the threshold value α and equal to or smaller than the threshold value β, that is, when α <= θ ₂ <= β, it is determined that the rotation is executed (FIG. 8 ( a)). The threshold values α and β are 0 ° <α <180 °, 0 ° <β <180 °, and α ≠ β, and are set in advance by the system designer. For example, the threshold value α = 30 ° and the threshold value β = 150 °.

  With this condition determination, as shown in FIG. 8B, when the angle is too large, it is not determined to be rotation but can be determined to be a pinch out (enlargement operation). On the other hand, as shown in FIG. 8C, even when the angle is too small, it is not determined as rotation but can be determined as pinch-in (reduction operation).

  Note that it is preferable that the execution determination of the rotation and the determination process of the rotation direction are repeatedly executed periodically while the second input point is being dragged in order to promptly respond to the input operation by the user.

<Determination of rotation direction>
In the present embodiment, when the rotation execution determination is made as described above, the rotation direction is determined based on the drag direction of the second input point. FIG. 9 is a diagram for explaining the determination of the rotation direction. First, as shown in FIG. 9, a drag direction is considered from positions Pn-1 and Pn during dragging of the second input point.

  FIG. 10 is a diagram for explaining the determination of the rotation direction when the rotation axis is the x-axis. Consider a case where the display area is divided by a straight line passing through the position Pn-1 during dragging of the second input point and parallel to the horizontal frame line of the display area. As shown in FIG. 10A, if the drag direction is upward, it is determined to be “right rotation”. As shown in FIG. 10B, if the drag direction is downward, “ "Rotate left".

  FIG. 11 is a diagram for explaining the determination of the rotation direction when the rotation axis is the y-axis. Consider the display area divided by a straight line passing through the position Pn-1 during dragging of the second input point and parallel to the vertical frame line of the display area. As shown in FIG. 11 (a), if the drag direction is toward the left side, “right rotation” is determined, and as shown in FIG. 11 (b), if the drag direction is toward the right side, “left "Rotation".

  FIG. 12 is a flowchart showing a flow of processing of rotation execution determination and rotation direction determination in the rotation execution determination unit 40.

  First, the rotation execution determination unit 40 acquires the position of the first input point, the position of the second input point, and the position information during the dragging of the second input point from the input unit 10 and stores them in the rotation axis information storage unit 60. The selected rotation axis information is referred to (step S1201).

  Next, it is determined whether or not the selected rotation axis information is “none” (step S1202).

  If the selected rotation axis information is “none” (Yes in step S1202), the rotation execution determination and rotation direction determination processing ends.

If the selected rotation axis information is not “None” (No in step S1202), the line segment SL1 connecting the position of the first input point and the position Pn-1 of the second input point, the position Pn-1 of the second input point, and Based on the line segment SL2 connecting Pn, the subordinate angle θ ₂ of the _two line segments is calculated (step S1203).

Subsequently, when 0 ° <α <180 °, 0 ° <β <180 °, and α ≠ β, the minor angle θ ₂ and the two threshold values α and β are α <= θ ₂ <= β. Is determined (step S1204).

If α <= θ ₂ ≦ β (No in step S1204), the rotation execution determination process ends.

On the other hand, if α <= θ ₂ <= β (Yes in step S1204), it is next determined whether or not the selected rotation axis is the x-axis (step S1205).

  If the selected rotation axis is the x-axis (Yes in step S1205), it is determined whether or not the drag direction is downward (step S1206).

  If the drag direction is the lower side (Yes in step S1206), the rotation direction is determined to be “left rotation” (step S1207). If the drag direction is not the lower side (No in step S1206), the rotation direction is set to “right "Rotation" is determined (step S1208).

  On the other hand, if the selected rotation axis is not the x-axis (No in step S1205), it is determined whether the drag direction is the right side (step S1209).

  If the drag direction is the right side (Yes in step S1209), the rotation direction is determined to be “left rotation” (step S1210). If the drag direction is not the right side (No in step S1209), the rotation direction is “right rotation”. (Step S1211).

  Information on the selected rotation axis and rotation direction is sent to the drawing instruction unit 50.

<Change in rotation direction>
The rotation direction can be changed during the drag by periodically determining the rotation direction while the second input point is being dragged.

  FIG. 13 is a diagram illustrating a change in the rotation direction. As shown in FIG. 13, for example, if the drag direction is changed to the right during the right rotation, the rotation is changed to the left rotation. In the example shown in FIG. 13, what was clockwise rotation in the first rotation direction determination process is changed to left rotation in the second rotation direction determination process.

<Deselect rotation axis>
When the rotation axis selection cancellation unit 30 receives a notification of the release of pressing of the first input point from the input unit 10, the rotation axis selection cancellation unit 30 updates the selected rotation axis information to “none” and cancels the selection of the rotation axis by the user. FIG. 14 is a diagram for explaining the selection cancellation of the rotation axis. As shown in FIG. 14, when the user's operation transitions to (A) the first input point is not pressed, or (B) the first input point and the second input point are not pressed, the rotation axis The selection is canceled. On the other hand, if (C) the first input point remains pressed and the second input point is no longer pressed, the rotation axis remains fixed, for example, on the y axis, and the second input point is newly pressed. Then, a rotation execution determination process is performed.

[Example]
Next, examples of the present embodiment will be described. FIG. 15 is a diagram for explaining preconditions in the present embodiment. As shown in FIG. 15A, in this embodiment, considering a situation where one plane and a rectangular parallelepiped placed on the plane are displayed in the three-dimensional display space, the rotation center point is at the center of the plane. Suppose that it is set. In this embodiment, it is assumed that the user presses the first input point and the second input point as shown in FIG.

<Rotation axis determination>
FIG. 16 is an explanatory diagram for applying the first method for determining the rotation axis using the positional relationship between the first input point and the display area in the present embodiment. In this embodiment, the area division of the display area is set as shown in FIG. Furthermore, in the present embodiment, as shown in FIG. 16B, the first input point is located at the “upper part”.

  Therefore, according to the first method for determining the rotation axis, in the flowchart shown in FIG. 4 described above, the determination in step S42 is No, the determination in step S43 is Yes, and the rotation axis in the present embodiment is “y-axis”. Determined.

  Next, FIG. 17 is an explanatory diagram for applying the second method of determining the rotation axis using the positional relationship between the drag start positions of the first input point and the second input point in this embodiment. In this embodiment, the threshold value a = 30 ° is set, and V and H have a relationship as shown in FIG.

  Therefore, according to the second method of determining the rotation axis, in the flowchart shown in FIG. 6 described above, the determination in step S62 is Yes and the determination in step S63 is Yes. Determined.

<Rotation execution judgment>
FIG. 18 is a diagram for explaining the relationship between the recessive angle θ ₂ and the threshold values α and β in the present embodiment. In the present embodiment, if α = 30 ° and β = 150 ° are set, as shown in FIG. 18, θ ₂ = 80 °, and therefore the condition of α <= θ ₂ <= β is satisfied. . The drag direction is on the right side.

  Therefore, in the flowchart shown in FIG. 12 described above, the determination in step S1202 is No, the determination in step S1204 is Yes, the determination in step S1205 is No, and the rotation axis in this embodiment is determined as “y-axis”. The determination in step S1209 is Yes, and the rotation direction in this embodiment is determined as “left rotation”.

<Calculation of rotation angle>
Assume that the rotation angle calculation method when the rotation axis is the y-axis is determined as follows.

  Let the drag distance (pixel) in the x-axis direction on the display area be d, and the horizontal size of the display area be v (pixel).

  When the rotation angle is q, q = 90 * d / v.

  For example, assuming that v is 1600 pixels and d is 400 pixels, the rotation angle q is 90 * 400/1600 = 22.5 degrees. FIG. 19 is a diagram for explaining drawing by rotating the viewpoint 22.5 degrees to the left about the rotation axis y in the present embodiment.

(Modification 1 of this embodiment)
Next, Modification 1 of the present embodiment will be described.

  A case will be described in which the pinch-in operation on the touch screen is used as a “zoom-in” operation for bringing the viewpoint closer to the rotation center point, and the pinch-out operation is used as a “zoom-out” operation for moving the viewpoint away from the rotation center point.

The rotation execution determination unit 40 determines whether the user instruction corresponds to viewpoint rotation, pinch-in, or pinch-out. FIG. 20 is a diagram for explaining the first modification. As shown in FIG. 20, when α ≦ = θ ₂ ≦ β, it is determined that the instruction is to rotate the viewpoint, and when the minor angle θ ₂ is too small (θ ₂ <α), a pinch-in operation ( It is determined that the zoom-in operation is performed, and if the minor angle is too large (β <θ ₂ ), it is determined that the operation is a pinch-out operation (zoom-out).

  A determination result is passed from the rotation execution determination unit 40 to the drawing instruction unit 50, and the drawing instruction unit 50 instructs drawing of any one of rotation of the viewpoint, zoom-in, and zoom-out.

  According to the first modification, the user continuously instructs the three types of operations of rotating the viewpoint, zooming in, and zooming out by simply dragging the second input point while maintaining the pressing of the first input point. be able to.

(Modification 2 of this embodiment)
Next, a second modification of the present embodiment will be described. The modification 2 is a process in the case where an operation such as selection of an object (object) is combined with rotation of the viewpoint. In such a case, in the first step of the rotation axis determination process, a process of determining whether or not the position of the first input point obtained from the input unit 10 corresponds to an object drawing pixel is performed. When the position of the first input point corresponds to the object drawing pixel, the rotation axis is not selected. FIG. 21 is a diagram for explaining the second modification. When the first input point is as shown in FIG. 21, the rotation axis is not selected because it corresponds to the drawing pixel of the planar object.

(Modification 3 of this embodiment)
Next, Modification 3 of the present embodiment will be described. Modification 3 is a case where the display area is used for a plurality of purposes. FIG. 22 is a diagram for explaining the third modification. As shown in FIG. 22, this embodiment may be applied by preparing an operation reception dedicated area for three-dimensional space display and regarding the operation for the area as an operation for the display area.

  As described above, according to the present embodiment, selection and rotation of a rotation axis can be realized by an operation that can be used in combination with an existing representative operation in the display of a two-dimensional space.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Graphic processing apparatus 10 ... Input part 20 ... Rotation axis determination part 30 ... Rotation axis selection cancellation | release part 40 ... Rotation execution determination part 50 ... Drawing instruction | indication part 60 ... Rotation Axis information storage unit 70 ... Drawing unit

Claims (15)

A graphic processing apparatus that sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area,
Accepting a touch operation on the display area by the user as an input, when two inputs are started, the position of the first input point that starts earlier, the second input that starts later than the first input point An input unit for acquiring information on a position of a point and a position during dragging of the second input point;
A rotation axis determination unit that determines a rotation axis for executing rotation of the viewpoint in a three-dimensional space based on the positional relationship between the first input point and the display area;
Rotation execution determination that determines execution of rotation on the rotation axis based on a positional relationship between the first input point and the second input point, and determines a rotation direction based on a drag direction of the second input point. A graphics processing device.   The rotation axis determination unit determines the y axis as a rotation axis if the position of the first input point is located above or below the display area, and the position of the first input point is the left of the display area. The graphic processing apparatus according to claim 1, wherein the x-axis is determined as a rotation axis if the rotation axis is located at a part or a right part.   The rotation axis determination unit sets a non-reaction part that does not respond to a touch operation in the display area, and does not determine the rotation axis if the position of the first input point is located in the non-reaction part. 1. The graphic processing apparatus according to 1. A graphic processing apparatus that sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area,
Accepting a touch operation on the display area by the user as an input, when two inputs are started, the position of the first input point that starts earlier, the second input that starts later than the first input point An input unit for acquiring information on the position of the point and the position of the second input point being dragged;
A rotation axis determination unit that determines a rotation axis for executing rotation of a viewpoint in a three-dimensional space based on a positional relationship between drag start positions of the first input point and the second input point;
A rotation execution determination unit that determines execution of rotation on the rotation axis based on a positional relationship between the first input point and the second input point, and determines a rotation direction based on a drag direction of the second input point. A graphic processing device comprising: The rotation axis determination unit
Regarding the position of the first input point and the drag start position of the second input point,
If the narrow angle formed by the straight line passing through the two input points and the vertical frame of the display area satisfies the condition that it is equal to or less than a predetermined value, the rotation axis is determined as the y-axis,
5. The rotation axis is determined as an x-axis when a condition that a narrower angle formed by a straight line passing through the two input points and a horizontal frame line of the display area satisfies a predetermined value or less is satisfied. Graphics processing equipment. The rotation execution determination unit
A line connecting the position of the first input point and the position Pn-1 during dragging of the second input point, and a line connecting the position Pn-1 and the nth position Pn during dragging of the second input point The graphic processing device according to claim 4, wherein the rotation is determined to be performed when the minor angle formed by the two line segments is within a predetermined range. The rotation execution determination unit
The rotation axis is an x-axis;
If the display area is divided by a straight line that passes through the dragging position Pn-1 of the second input point and is parallel to the horizontal frame line of the display area, and the drag direction is upward, the right The graphic processing apparatus according to claim 6, wherein the graphic processing device is determined to be rotation, and is determined to be left rotation if the drag direction is directed downward. The rotation execution determination unit
The rotational axis is the y-axis;
When the display area is divided by a straight line that passes through the position Pn-1 during dragging of the second input point and is parallel to the vertical frame line of the display area, if the drag direction is to the left, the right The graphic processing apparatus according to claim 6, wherein the graphic processing device is determined to be rotation, and if the drag direction is directed to the right side, it is determined to be left rotation. A rotation axis information storage unit that stores information on the rotation axis determined by the rotation axis determination unit as selected rotation axis information;
A drawing instruction unit for instructing drawing of a three-dimensional space rotated by a predetermined rotation angle in the determined rotation direction on the determined rotation axis;
Information on the object to be drawn and the specifications of the display area are obtained, and the projection onto the two-dimensional plane of the three-dimensional space after rotating the viewpoint in response to an instruction from the drawing instruction unit is displayed on the display area. The drawing part to be
The graphic processing apparatus according to claim 1, further comprising:   A rotation axis selection canceling unit that acquires information on the release cancellation notification of the first input point from the input unit, and updates the selected rotation axis information stored in the rotation axis information storage unit to a state of none. Item 10. The graphic processing device according to Item 9.   11. The graphic processing according to claim 1, wherein the rotation execution determination and the rotation direction determination processing in the rotation execution determination unit are repeatedly executed periodically while the second input point is being dragged. apparatus. The rotation execution determination unit
In the case where the minor angle is smaller than the lower limit of the predetermined range, it is determined as a pinch-in operation,
The graphic processing device according to claim 6, wherein when the minor angle is larger than an upper limit of the predetermined range, it is determined as a pinch-out operation. The rotation axis determination unit
The graphic processing apparatus according to claim 1, wherein when the position of the first input point corresponds to a pixel for drawing an object, the rotation axis is not selected. The display area is
The graphic processing device according to claim 1, wherein the graphic processing device is divided into a region for receiving a three-dimensional space display operation and a region other than the region. A graphic processing apparatus that sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area.
Accepting a touch operation on the display area by the user as an input, when two inputs are started, the position of the first input point that starts earlier, the second input that starts later than the first input point A function of acquiring information of a position of a point and a position during dragging of the second input point;
A function for determining a rotation axis for executing rotation of a viewpoint in a three-dimensional space based on a positional relationship between the first input point and the display area;
A function of determining execution of rotation on the rotation axis based on a positional relationship between the first input point and the second input point, and determining a rotation direction based on a drag direction of the second input point;
Graphic processing program for realizing

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