JP6526851B2 - Graphic processing apparatus and graphic processing program - Google Patents

Description

  Embodiments of the present invention relate to a graphic processing device and a graphic processing program.

  Although there exist applications that display a three-dimensional space in a two-dimensional area, conventionally, a three-dimensional space display is actually used only in a specialized area that deals with a three-dimensional object. For example, shape modeling (a car, a building, a precision instrument part, etc.) or medical data display (built-in 3D image display, etc.).

  In the three-dimensional space display for professionals, it is sufficient to spend the cost of learning the operation method, and multifunctionality and accuracy are more important than the intuitiveness of the operation.

  From now on, it is expected that the display of the three-dimensional space will spread even for users who are not used to the operation of the three-dimensional space. For example, a web service that displays the power consumption of each town superimposed on a map, and an in-store system that visually displays the sales status and transition information for each shelf row and column on a three-dimensional map in the store is there.

  In order for the user to grasp the three-dimensional space, it is necessary to move the viewpoint to be able to view from various positions and directions, and one of the operations therefor 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 and rotate the viewpoint in any direction based on the input operation from the user, but a rotation axis that can achieve the target rotation It is difficult for an unfamiliar user to specify correctly. This is partly because the input to the two-dimensional region must indicate the rotation of the viewpoint in the three-dimensional space.

  For example, the rotation of the viewpoint in the three-dimensional space is designated by the locus of the mouse drag on the two-dimensional area. Therefore, a method of realizing rotation of the viewpoint by repeatedly selecting and rotating any one of the x-axis, y-axis and z-axis as the rotation axis is also used.

  However, by limiting the selectable rotation axis, it is possible to realize rotation that is easy for the user to understand, but by limiting the selectable rotation axis, the position of the viewpoint that can be moved by one rotation is limited. . In addition, as compared with the case where the selectable rotation axis is not limited, the number of rotations required to realize rotation of an arbitrary viewpoint increases, and it takes time for the user.

  As described above, the method of selecting the rotation axis from the limited candidates can not select the rotation axis unless the point operation is performed at a specific portion in a narrow range, and the user is allowed to select the rotation axis. Problem is that it is essential to

Software Blender for 3D Modeling http://blender.jp/modules/docs/index.php

JP-A-9-185455

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

The graphic processing apparatus according to the embodiment is 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, and receives a touch operation of the display area by the user as an input. When two inputs are started, the position of the first input point whose start is earlier, the position of the second input point whose start is later than the first input point, and the position of the second input point A rotation axis for performing rotation of a viewpoint in a three-dimensional space based on an input unit that acquires information on a position during dragging, and the relationship between the position of the first input point on the display area and the display area a rotating shaft determination unit that determines the a straight line SL1 that connects the position Pn-1 in the drag of the second input point and the position of the first input point, and the position Pn-1 in the drag of the second input point based on the angle formed by the straight line SL2 connecting the pn, Determining the execution of the rotation at the serial rotation axis, based on a drag direction of the second input point, and a rotary execution determination unit which determines the direction of rotation.

FIG. 1 is a block diagram showing a schematic configuration of a graphic processing apparatus according to an embodiment of the present invention. It is a figure explaining each part of a display area. It is a figure explaining an example which provided a non-reaction part in a display field. It is a flowchart which shows the flow of the process in the 1st method of rotating shaft determination. It is a figure explaining the vertical relation of an input point, and the horizontal relation of an input point. It is a flowchart which shows the flow of the process in the 2nd method of rotational-axis determination. It is a figure explaining execution decision of rotation. It is a figure explaining execution decision 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 a process of rotation execution determination and rotation direction determination in a rotation execution determination part. It is a figure explaining the change of a rotation direction. It is a figure explaining selection cancellation 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 inferior angle (theta) ₂ and threshold value (alpha), (beta) in a present Example. In a present Example, it is a figure explaining the drawing by rotating a viewpoint left rotation 22.5 degree | times with the rotating shaft 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. The same reference numerals are given to the same parts in the respective drawings, and duplicate explanations are omitted.

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

  The "display area" refers to a two-dimensional area displaying a three-dimensional space in the screen. In the display area, contents in which the appearance is projected onto a two-dimensional plane from a certain viewpoint in the three-dimensional space are drawn. What two-dimensional plane to project depends on the application.

  The "viewpoint" is what determines which direction and in what position the space is viewed. By changing the position of the point of view and the direction of the point of view, objects in a three-dimensional space can be viewed from different angles.

  "Rotation of the viewpoint" refers to one of movements for changing the position of the viewpoint and the direction of the viewpoint. In the case of moving the position v1 of the viewpoint to the position v2 while maintaining the distance to the point c with respect to the viewpoint facing an arbitrary point c in the three-dimensional space, the point c is called a rotation center point. A straight line perpendicular to the plane including the three points c, v1 and v2 and passing through the point c is called the 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 is right rotation (counterclockwise) and left rotation (clockwise) of the viewpoint with respect to the rotation axis, and the rotation direction of the viewpoint and the rotation direction of the object in the three-dimensional space drawn in the display area are opposite. For example, when the viewpoint is rotated to the right around the rotation axis, the appearance in the display area appears as if the object is rotated to the left around the rotation axis.

  "Tap" is one type of user's input to the display area, and refers to an operation of tapping on the screen with a touch interface type terminal. It corresponds to the click of the mouse operation, and tapping twice in a row in a short time is sometimes called "double tap", and tapping once may be called "single tap".

  "Drag" is one type of user's input to the display area, and means moving on the screen while holding the button or finger at the time of tapping. Sometimes you just hold it down without moving it.

  “Pinch-in” refers to an operation of simultaneously performing two inputs with two fingers on the display area, pinching them, and shrinking the screen.

  "Pinch out" refers to an operation in which two inputs are simultaneously performed with two fingers on the display area and are moved so as to widen to enlarge the screen.

  The “input point” refers to a point position at the time of tapping or dragging in the display area.

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

The "minor angle" refers to the smaller angle between two line segments or half lines having intersection points on a plane. The inferior angle is greater than 0 ° and less than 180 °.

  In this embodiment, the rotation axis for performing rotation of the viewpoint in the three-dimensional space is determined from (1) 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 by any of the positional relationships of the drag start positions of the two, and it is determined from the positional relationship of the first input point and the second input point whether to rotate or not, from the dragging direction of the second input point , Determine the direction of rotation.

  Moreover, in the present embodiment, up and down, left and right dragging in the display area is basically an operation for parallel movement, and 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 device is realized using a general-purpose computer (for example, a personal computer (PC) or the like) and software operating on the computer. The computer also includes an engineering work station (EWS) suitable for CAD (Computer Aided Design) and CAE (Computer Aided Engineering). In this embodiment, in this computer, (1) determination based on the positional relationship between the first input point and the display area, and (2) determination based on the positional relationship between the first input point and the second input point The program also determines the rotation axis based on the parameter, determines whether to rotate from the positional relationship between the first input point and the second input point, and determines the rotation direction from the dragging direction of the second input point. it can.

  As shown in FIG. 1, the figure processing apparatus 1 according to the present embodiment mainly includes an input unit 10, a rotation axis determination unit 20, a rotation axis selection cancellation 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 an input of a touch interface type, and is configured of, 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 start is later than the first input point is acquired. While the second input point is being dragged, the input unit 10 acquires the position during dragging. 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 during dragging of the second input point, and the notification of depression of the first input point.

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

(1) Determination of the rotation axis by the positional relationship between the first input point and the display area (2) Determination of the rotation axis by the positional relationship between the drag start position of the first input point and the second input point It has selected rotation axis information of “none”, “x axis”, or “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 already stored selected rotation axis information. The initial value of the selected rotation axis information is "none" until the user selects the rotation axis.

  The rotation axis selection cancellation unit 30 acquires information on the press release 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 acquires information on the position of the first input point and the position of the second input point during dragging from the input unit 10, and selects the selected rotation axis information stored in the rotation axis information storage unit 60. refer. If the selected rotation axis information is not "none", and if a predetermined determination condition described later is satisfied based on the positional relationship between the first input point and the second input point, the object to be drawn is "rotated". If it is determined that the condition is not satisfied, it is determined that "rotation is not performed". Details of the rotation execution determination will be described later. When the selected rotation axis information is "absent", it is determined that the rotation axis is not selected.

  Furthermore, the rotation execution determination unit 40 determines the rotation direction in accordance with the dragging direction of the second input point. When the rotation execution determination unit 40 determines that “rotation” is performed, 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, the selected rotation axis information, and the information on the position during dragging of the second input point from the rotation execution determination unit 40, and the system designer sets in advance a method for setting the second input point. The rotation angle of the object to be drawn is calculated using the position during dragging. Here, the rotation angle can be calculated, for example, from the difference in the y-axis direction of any two points in the two-dimensional coordinates of the display area, where the rotation axis is the x-axis.

  Further, the drawing instruction unit 50 instructs drawing of an object in a three-dimensional space 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 to instruct drawing in order to reflect changes in an object or viewpoint in a three-dimensional space such as zoom in / zoom out of a viewpoint, parallel movement, movement of an object, or the like, as well as rotation of the object in a display area.

  The rotation axis information storage unit 60 stores the selected rotation axis information. The initial value is "none".

  The drawing unit 70 acquires information of the object to be drawn, specifications of the display area, and the like, receives an instruction from the drawing instruction unit 50, and finally rotates the viewpoint to a two-dimensional plane of the three-dimensional space. Display the projection of 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 device 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, as shown in FIG. 2A, the display area is divided into four areas of upper and lower parts, and as shown in FIG. 2B, left and right parts. The user can set how to divide into four. In addition to the upper, lower, left, and right portions, portions that do not respond to the touch operation from the user may be set in the display area. FIG. 3 is a view for explaining an example in which a non-reactive portion is provided in the display area.

(First method of determining the rotation axis)
In the first method of rotational axis determination,
(1) If the position of the first input point is located at the upper or lower part 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 flow chart showing the flow of processing in the first method of rotational axis determination.

  First, with regard to the position of the first input point acquired in the input unit 10, the rotation axis determination unit 20 calculates which of the upper, lower, left, right, or non-reactive part in the display area is located ( Step S41).

  Next, it is determined whether 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 processing of the first method of determining the rotation axis is ended, and if the position of the first input point is not a non-reactive part (step S42) No), it is determined whether the position of the first input point is the upper or lower portion (step S43).

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

  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 the "x axis" (step S45). finish.

(Second method of determining the rotation axis)
In the second method of rotational axis determination,
(2) If the position of the first input point and the drag start position of the second input point are in the “vertical relation”, the “y axis” is used, and if the “horizontal relation” is in, the “x axis” is used as the rotation axis decide. In addition, the determination that the input operation by the user is a drag operation can apply a known method.

FIG. 5 is a diagram for explaining the vertical relationship between input points and the horizontal relationship between input points. FIG. 5 (a) shows the case where two input points are in a vertical relationship, and FIG. 5 (b) shows the case where two input points are in a horizontal relationship. As shown in FIG. 5, it is considered whether the narrow angle θ _{1 formed} by the straight line passing through the two input points and the vertical and horizontal border lines of the display area satisfies the determination condition that the threshold value a or less.

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

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

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

  FIG. 6 is a flowchart showing the flow of processing in the second method of rotational axis determination.

  First, regarding 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 sets a straight line passing through the drag start position of the first input point and the second input point The narrow angle V 1 made by the vertical frame line of the display area and the narrow angle H made by the horizontal frame line of the display area are calculated (step S 61).

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

  If V <H (Yes in step S62), the threshold a is compared with the size to determine whether V <= a or not (step S63).

  If V <= a (No at step S63), processing of the second method of rotational axis determination is ended, and if V <= a (Yes at step S63), the selected rotational axis information is "y-axis (Step S64), and the process of the second method of rotational axis determination is ended.

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

  If it is not V> H (No at Step S65), the processing of the second method of rotational axis determination is ended, and if V> H (Yes at Step S65), it is determined whether or not H <= a. (Step S66).

  If H <= a (No in step S66), the processing of the second method of rotational axis determination is ended, and if H <= a (Yes in step S66), the selected rotational axis information (Step S67), and the processing of the second method of rotational axis determination is ended.

  About grasping (recognition) of the x-axis or y-axis by the user when the rotation axis is selected as described above, for example, the following can be performed.

(1) Draw a rotation axis on the display area as supplementary information (2) Display a text indicating the rotation axis somewhere inside or outside the display area <determination of execution of rotation>
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 to be rotated about the rotation axis (that is, the viewpoint is to be rotated). FIG. 7 and FIG. 8 are diagrams for explaining execution determination of rotation. As shown in FIG. 7, it is assumed that 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 nth process during the dragging is performed is P n. The first input point and the second input point may be in any position 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 position Pn-1 during dragging of the second input point, and a line segment connecting the position Pn-1 during dragging of the second input point and Pn Consider an inferior angle θ2 formed by _two line segments SL1 and SL2 with respect to SL2.

In the present embodiment, at minor angle theta ₂ threshold alpha or more and, if more than the threshold beta, i.e., α _<= θ ₂ <= in the case of beta determines that execution of the rotation (FIG. 8 ( a) see). The threshold α and the threshold β are 0 ° <α <180 °, 0 ° <β <180 °, α 、 β, and are set in advance by a system designer. For example, the threshold value α = 30 ° and the threshold value β = 150 °.

  If the angle is too large as shown in FIG. 8B according to the condition determination, it can be determined as pinch out (enlargement operation) without determination as rotation. On the other hand, as shown in FIG. 8C, even when the angle is too small, it is possible to determine that it is pinch-in (reduction operation) without determining rotation.

  In addition, it is preferable that the determination processing of the execution of the rotation and the determination of the rotation direction be periodically repeatedly performed during the dragging of the second input point in order to promptly respond to the input operation by the user.

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

  FIG. 10 is a diagram for explaining the determination of the rotational direction when the rotational axis is the x-axis. The display area is considered to be divided by a straight line parallel to the horizontal border line of the display area, which passes through the position Pn-1 during dragging of the second input point. As shown in FIG. 10 (a), if the dragging direction is upward, it is determined as "right rotation", and as shown in FIG. 10 (b), if the dragging direction is downward, " Decide to "rotate left".

  FIG. 11 is a diagram for explaining the determination of the rotational direction when the rotational axis is the y-axis. The display area is considered to be divided by a straight line parallel to the vertical frame line of the display area, which passes through the position Pn-1 during dragging of the second input point. As shown in FIG. 11 (a), if the dragging direction is toward the left, it is determined that "right rotation", and as shown in FIG. 11 (b), if the dragging is toward the right, "left" Decide "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 from the input unit 10 the position of the first input point, the position of the second input point, and the position information of the second input point during dragging, and is stored in the rotation axis information storage unit 60. The selected rotation axis information is referred to (step S1201).

  Next, it is determined whether the selected rotation axis information is "absent" (step S1202).

  If the selected rotation axis information is "absent" (Yes in step S1202), the processing of rotation execution determination and rotation direction determination is ended.

If the selected rotation axis information is not "none" (No in step S1202), a line segment SL1 connecting the position of the first input point and the position Pn-1 of the second input point, and the position Pn-1 of the second input point Based on the line segment SL2 connecting Pn, the subordinate angle θ2 of the _two line segments is calculated (step S1203).

Subsequently, 0 ° <α <180 ° , 0 ° <β <180 °, when it is alpha ≠ beta, minor angle theta ₂ and two threshold values alpha, beta and is, whether α <= θ ₂ <= β or It is determined (step S1204).

If it is not α <= θ ₂ <= β (No in step S1204), the process of the rotation execution determination is ended.

On the other hand, if α <= θ ₂ <= β (Yes in step S1204), it is next determined whether 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 the dragging direction is on the lower side (step S1206).

  If the drag direction is the lower side (Yes in step S1206), the rotational direction is determined to be “left rotation” (step S1207), and if the drag direction is not the lower side (No in step S1206), the rotational direction is “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 dragging direction is the right side (step S1209).

  If the dragging direction is on the right (Yes at step S1209), the rotation direction is determined to be "left rotation" (step S1210), and if the dragging direction is not on the right (No at step S1209), the rotation direction is "right rotation" (Step S1211).

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

<Change in rotation direction>
The rotation direction may be changed during the dragging by repeatedly determining the rotation direction periodically during the dragging of the second input point.

  FIG. 13 is a diagram for explaining the change in the rotational direction. As shown in FIG. 13, for example, when rotating in the right direction, changing the dragging direction to the right changes to left rotation. In the example shown in FIG. 13, what was right rotation in the first rotation direction determination processing changes to left rotation in the second rotation direction determination processing.

<Deselecting rotation axis>
When the rotation axis selection release unit 30 receives the notification of the release of pressing of the first input point from the input unit 10, the rotation axis selection release unit 30 updates the selected rotation axis information to "none" and releases the user's selection of the rotation axis. FIG. 14 is a diagram for explaining selection cancellation of the rotation axis. As shown in FIG. 14, when the user's operation transitions to (A) no pressing of the first input point, or (B) no pressing of both the first input point and the second input point, Selection is canceled. On the other hand, when (C) the first input point remains pressed and the second input point is not pressed, the rotation axis remains fixed at, for example, the y-axis, and if the second input point is pressed anew And rotation execution determination processing is performed.

[Example]
Next, an example of the present embodiment will be described. FIG. 15 is a diagram for explaining the preconditions in the present embodiment. As shown in FIG. 15 (a), in the present embodiment, considering a situation in which one plane and a rectangular solid placed on the plane are displayed in the three-dimensional display space, the rotation center point is at the center of the plane. It is assumed that it is set. Further, in this embodiment, as shown in FIG. 15B, it is assumed that the user presses the first input point and the second input point.

<Rotation axis determination>
FIG. 16 is an explanatory view applying the first method of rotational axis determination using the positional relationship between the first input point and the display area in the present embodiment. In the present embodiment, 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”.

  Therefore, according to the first method of rotational axis determination, 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 rotational axis in the present embodiment is “y axis Is determined.

  Next, FIG. 17 is an explanatory view applying the second method of rotational axis determination using the positional relationship between the drag start positions of the first input point and the second input point in the present embodiment. In the present embodiment, the threshold value a is set to 30 °, and V and H have a relationship as shown in FIG.

  Therefore, according to the second method of rotational axis determination, in the flowchart shown in FIG. 6 described above, the determination in step S62 is Yes, the determination in step S63 is Yes, and the rotational axis in the present embodiment is “y axis Is determined.

<Rotation execution judgment>
18, in this embodiment, minor angle theta ₂ and the threshold alpha, is a diagram illustrating a relationship between beta. In this embodiment, assuming that α = 30 ° and β = 150 °, the condition of α <= θ ₂ <= β is satisfied because θ ₂ = 80 ° as shown in FIG. . Also, the dragging direction is on the right.

  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 the present embodiment is determined to be “y axis”. The determination in step S1209 is YES, and the rotation direction in the present embodiment is determined to be "left rotation".

<Calculation of rotation angle>
It is assumed that the method of calculating the rotation angle when the rotation axis is the y-axis is determined as follows.

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

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

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

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

  A case will be described where pinch-in operation on the touch screen is used as "zoom-in" operation for bringing the viewpoint close to the rotation center point, and pinch-out operation is used as "zoom-out" operation for moving the viewpoint away from the rotation center point.

The rotation execution determination unit 40 determines whether the user's instruction corresponds to rotation of the viewpoint, pinch in, or pinch out. FIG. 20 is a diagram for explaining the first modification. As shown in FIG. 20, when there is a relation of α <= θ ₂ <= β, it is judged as an instruction to rotate the viewpoint, and when the inferior angle θ ₂ is too small (θ ₂ <α), pinch in operation ( If it is determined that the inferior angle is too large (β <θ ₂ ), it is determined that a pinch out operation (zoom out) is performed.

  The 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 of rotation of the viewpoint, zooming in, and zooming out.

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

(Modification 2 of this embodiment)
Next, Modification 2 of the present embodiment will be described. The modification 2 is processing in the case of using an operation such as selection of an object (object) together with rotation of a viewpoint and the like. In such a case, a process of determining whether the position of the first input point obtained from the input unit 10 corresponds to the object drawing pixel is performed in the first step of the rotation axis determination process. If 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 plane object.

(Modification 3 of this embodiment)
Next, a third modification of the present embodiment will be described. The third modification 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 on that area as the operation on the display area.

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

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

1 ... figure processing device 10 ... input unit 20 ... rotation axis determination unit 30 ... rotation axis selection cancellation unit 40 ... rotation execution determination unit 50 ... drawing instruction unit 60 ... rotation Axis information storage unit 70 ··· Drawing unit

Claims (14)

A graphic processing apparatus which sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area,
When the user receives a touch operation on the display area by the user as an input, and two inputs are started, the position of the first input point whose start is earlier, the second input whose start is later than the first input point An input unit that acquires information on the position of a point and the position of the second input point during dragging;
A rotation axis determination unit that determines a rotation axis for executing rotation of a viewpoint in a three-dimensional space based on the relationship between the position of the first input point on the display area and the display area ;
An angle formed by a straight line SL1 connecting the position of the first input point and the position Pn-1 of the second input point during dragging, and a straight line SL2 connecting the position Pn-1 of the second input point during dragging and Pn And a rotation execution determination unit that determines the execution of rotation on the rotation axis based on and determines the rotation direction based on the dragging direction of the second input point. The rotation axis determination unit determines the y axis extending in the vertical direction of the display area as the rotation axis if the position of the first input point is located above or below the display area, and the first input point The graphic processing apparatus according to claim 1, wherein the x-axis extending in the left-right direction of the display area is determined as the rotation axis if the position of is positioned on the left or right of the display area . A graphic processing apparatus which sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area,
When the user receives a touch operation on the display area by the user as an input, and two inputs are started, the position of the first input point whose start is earlier, the second input whose start is later than the first input point An input unit that acquires information on the position of a point and the position during dragging of the second input point;
The angle formed by the straight line connecting the position of the first input point , the second input point , and the x-axis line extending in the left-right direction of the display area, or the position of the first input point and the second input point A rotation axis determination unit that determines a rotation axis for performing rotation of a viewpoint in a three-dimensional space based on an angle formed by a connecting straight line and a y-axis line extending in the vertical direction of the display area ;
A straight line SL1 connecting the position of the first input point and the drag start position Pn-1 of the second input point, the drag start position Pn-1 of the second input point, and the nth drag of the second input point based on the angle between the straight line SL2 connecting the position Pn may determine the execution of the rotation in the rotating shaft, based on the drag direction of the second input point, and a rotary execution determination unit that determines the direction of rotation The figure processing apparatus provided. 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 line of the display area satisfies the predetermined value or less, the rotation axis is determined to be the y axis,
The rotation axis is determined to be the x-axis when the narrow angle formed by the straight line passing through the two input points and the horizontal frame line of the display area satisfies the predetermined value or less. Graphics processing device. The rotation execution determination unit
A straight line connecting the drag start position Pn-1 of the second input point and the position of the first input point, and the line connecting the n-th position Pn being dragged in the start position Pn-1 and the second input point The figure processing apparatus according to claim 3 or 4, wherein it is determined that rotation is performed when a subordinary angle formed by the two straight lines is within a predetermined range. The rotation execution determination unit
The rotation axis is an x axis,
When the display area is divided and captured by a straight line parallel to the horizontal border line of the display area passing through the drag start position Pn-1 of the second input point, if the drag direction is upward, then right rotation The figure processing apparatus according to claim 5, wherein if it is determined that the drag direction is downward, it is determined that the left rotation is performed. The rotation execution determination unit
The rotation axis is a y-axis,
When the display area is divided and captured by a straight line parallel to the vertical frame line of the display area passing through the drag start position Pn-1 of the second input point, if the drag direction is toward the left, right rotation The figure processing apparatus according to claim 5, wherein if the drag direction is toward the right, it is determined that the rotation is left rotation. A rotation axis information storage unit which stores information on the rotation axis determined by the rotation axis determination unit as selected rotation axis information;
A drawing instructing unit instructing drawing of a three-dimensional space rotated by a predetermined rotation angle in the determined rotation direction on the determined rotation axis;
Information of an object to be drawn and specifications of the display area are obtained, and in response to an instruction from the drawing instruction unit, a projection onto a two-dimensional plane of a three-dimensional space after rotating a viewpoint is displayed in the display area And the drawing unit
The figure processing apparatus according to any one of claims 1 to 7, further comprising:   The information processing apparatus further comprises: a rotation axis selection release unit that acquires information on a press release 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 no Item 8. A figure processing apparatus according to item 8.   The graphic processing according to any one of claims 1 to 9, wherein the execution determination of rotation and the determination processing of the rotation direction in the rotation execution determination unit are periodically and repeatedly performed while the second input point is dragged. apparatus. The rotation execution determination unit
If the subordinate angle is smaller than the lower limit of the predetermined range, it is determined that the pinch-in operation is performed,
The figure processing apparatus according to claim 5, wherein if the inferior angle is larger than the upper limit of the predetermined range, it is determined that the pinch-out operation is performed. The rotation axis determination unit
The figure processing apparatus according to any one of claims 1 to 11, wherein the rotation axis is not selected when the position of the first input point corresponds to a pixel for drawing an object.   The graphic processing device according to any one of claims 1 to 12, wherein a dedicated area for receiving an operation of three-dimensional space display is set in the display area, and an operation on the dedicated area is regarded as an operation on the display area. . In a graphics processing apparatus which sets a three-dimensional space on a display area of a two-dimensional area and displays an object on the display area,
When the user receives a touch operation on the display area by the user as an input, and two inputs are started, the position of the first input point whose start is earlier, the second input whose start is later than the first input point A function of acquiring information on the position of a point and the position of the second input point during dragging;
A function of determining a rotation axis for performing rotation of a viewpoint in a three-dimensional space based on a relationship between the position of the first input point on the display area and the display area ;
An angle formed by a straight line SL1 connecting the position of the first input point and the position Pn-1 of the second input point during dragging, and a straight line SL2 connecting the position Pn-1 of the second input point during dragging and Pn On the basis of the,
A function of determining execution of rotation on the rotation axis, and determining a rotation direction based on a dragging direction of the second input point;
If the position of the first input point is located above or below the display area, the y axis extending in the vertical direction of the display area is determined as the rotation axis, and the position of the first input point is the display area A graphic processing program for realizing a function of determining an x-axis extending in the left-right direction of the display area as a rotation axis if it is located on the left or right .

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