JP3363611B2 - Graphic information processing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic information processing method and apparatus, and more particularly to a graphic information processing method and apparatus for inputting elliptical shape information and performing processing such as correction.

[0002]

2. Description of the Related Art Conventionally, when an ellipse tangent to two straight lines orthogonal to each other is input, an appropriate ellipse tangent to these two straight lines is once generated, and then the user specifies the rotation and movement amount of the ellipse. The shape of the ellipse was corrected.

[0003]

Therefore, according to the conventional method, when the ellipse information which is in contact with two straight lines which are orthogonal to each other is inputted and when the ellipse is rotated to make a subtle correction of the shape, it is required by the operator. There is a problem in that it requires a high level of skill to operate, which imposes a burden on the user, and it is difficult to draw an ellipse that is in contact with two orthogonal straight lines with high accuracy.

The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a graphic processing method and apparatus capable of easily and accurately inputting / correcting a subtle elliptical shape.

[0005]

[0006]

[0007]

In order to achieve the above object, the graphic processing apparatus of the present invention has the following configuration.
In other words, storage means for storing information of two straight lines that are perpendicular to each other contact with the information and the ellipse about an ellipse, the storage Hand
Based on the information of the ellipse and the two straight lines stored in the column, a table
Display control means for displaying the ellipse and two straight lines in示画plane, before
With the intersection of the two straight lines as the center, the two straight lines are the X axis and the Y axis.
An ellipse and two straight lines rotated so that they are parallel to
Based on a calculation means for calculating and a movement reference point and a movement destination instruction point of the ellipse indicated by the display control means in a state where the ellipse and two straight lines are displayed on the display screen,
Rotation means for rotating the ellipse calculated by the calculation means by an angle formed by the center of the ellipse and the movement reference point and the movement destination point, and X-axes that are in contact with the ellipse rotated by the rotation means and are orthogonal to each other. A means for obtaining a positional deviation between two straight lines parallel to the Y axis and two straight lines in contact with the ellipse before the rotation by the rotating means, and a position of the ellipse calculated by the calculating means according to the amount of the positional deviation. The moving means for moving and the ellipse moved by the moving means are calculated by the calculating means.
Means for calculating an ellipse rotated in the opposite direction to the rotation by
Display the ellipse calculated by the calculating means on the display screen
And a display unit for displaying . In order to achieve the above object, the graphic processing method of the present invention includes the following steps. That is, it has a storage unit, a display unit, and an input unit.
A graphic processing method in a graphic processing device, comprising:
A reading step of reading the mutually orthogonal two linear contact with the ellipse and the ellipse stored in the storage unit, read in the reading step
Display the drawn ellipse and two straight lines on the display screen of the display unit.
And a step of recognizing a movement reference point designated by the input unit on a plane including the two straight lines displayed on the display screen, and a destination designation designated by the input unit on the plane. Step of recognizing points and intersection of the two straight lines
And the two straight lines are parallel to the X-axis and the Y-axis, respectively.
Calculation process for calculating an ellipse and two straight lines rotated so that
In the calculation step, only the angle formed by the center of the ellipse read in the read step and the movement reference point and the movement destination point.
Rotation step of rotating the calculated ellipse after rotation, and the rotation
That are orthogonal to each other tangent to the ellipse rotated by the process
The step of obtaining the positional deviation between the two straight lines parallel to the X-axis and the Y-axis and the two straight lines in contact with the ellipse before the rotation by the rotating step , and Calculated in the calculation process
A moving step of moving the position of the ellipse, in the moving step
Rotate the moved ellipse in the opposite direction to the rotation in the above calculation process
Calculating a ellipse, calculated in said step of calculating
And displaying the ellipse on the display screen .

[0008]

[Operation] With the above configuration, the ellipse stored in the storage unit
And read out two mutually orthogonal straight lines that contact the ellipse,
Display the read ellipse and two straight lines on the display screen of the display.
Show the input section on the plane containing the two displayed straight lines
Recognize the movement reference point and the movement destination designated point by
It Then, in the calculation step (means), the intersection of the two straight lines is centered
And rotate so that the two straight lines are parallel to the X and Y axes, respectively.
The center of the read ellipse after calculating the rolled ellipse and two straight lines
Calculated only for the angle between the movement reference point and the movement destination point
Rotate the rotated ellipse so that it touches the rotated ellipse.
2 straight lines that are respectively parallel to the X-axis and the Y-axis, and
Find the positional deviation from the two straight lines that touch the ellipse before rotation,
Depending on the amount of the positional deviation, the calculation step (means)
Move the position of the rolled ellipse,
The ellipse rotated in the opposite direction to the rotation by the calculation process (means)
calculate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. [First Embodiment] FIG. 1 is a flow chart for explaining the flow of operations in the graphic processing apparatus of the first embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of the graphic processing apparatus of the first embodiment. .

First, in FIG. 2, a bus 1 (including a control line, a data line and an address line) is connected to a central processing unit (CP).
U) 2, a read only memory (ROM) 3, which stores the control program shown in the flowchart of FIG.
A random access memory (RAM) 4, an input interface unit 5, a CRT interface unit 7, and an external storage interface unit 9 are connected. The input interface unit 5 controls the exchange of signals between the input unit 6 including a keyboard and a pointing device and the bus 1, and outputs the signal input from the input unit 6 to the bus 1. The CRT interface unit 7 receives the display data from the bus 1 and displays it on the display unit 8 such as a CRT or liquid crystal. The external storage device interface unit 9
Data is stored in the external storage device 10 such as a magnetic disk or a magnetic tape, or the data stored in the storage device 10 is read and output to the bus 1.

The CPU 2 uses the RAM 4 as a work area in accordance with a control program stored in the ROM 3 while performing various processes and controls such as graphic input control.
Graphic display, pick processing, hidden surface processing, inside / outside determination, etc. are performed. The input unit 6 includes, for example, a keyboard, a tablet (digitizer), a mouse, etc., and can input graphic data. The graphic data may be input from, for example, a host computer (not shown). The display unit 8 is
If necessary, a plurality of bit map planes and the like are included, and various figures can be displayed in a plurality of windows.

Next, referring to FIG. 3, an ellipse is defined based on the following components. (1) Center of the ellipse (O) (2) Long axis vector of the ellipse (a) Vector having the same direction as the long axis of the ellipse and the same length as the long axis of the ellipse (3) Short axis vector of the ellipse (B) Vector having the same direction as the minor axis of the ellipse and the same length as the minor axis of the ellipse Next, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 to 9. However, the processing and judgment described below are performed by the CPU 2 according to the program stored in the ROM 3.

The elliptical shape inputting method according to the first embodiment will be described below in the order of the flowchart of FIG. In this processing, it is assumed that data representing an ellipse as shown in FIG. 3 and data of two straight lines in contact with the ellipse are stored in the external storage device 10. First, in step S1, the ellipse and the data of two vertical straight lines in contact with the ellipse are read from the external storage device 10, and the two
Two tangent lines and an ellipse when the straight line is rotated so as to be parallel to the X axis and the Y axis are obtained.

This process will be described with reference to FIG. Figure 4
, An ellipse C0 and two tangents 4 to the ellipse C0
The data 01 and 402 are read from the external storage device 10, and each of these two tangents 401 and 402 is changed to a point 4
An ellipse C1 and two straight lines 403 and 404 when rotated so as to be parallel to the X axis and the Y axis around 10 are shown. Specifically, the angle φ formed by the X axis and the straight line 401 is obtained, and the center of the ellipse C0 and the minor axis of the ellipse C0 are calculated.
Rotate the major axis vector clockwise by an angle φ. The converted ellipse C1 is distinguished from the cases 1, 2, 3, and 4 depending on whether it is in the first, second, third, or fourth quadrant.

The original ellipse C0 and the two straight lines 40
1, 402 may be input from the input unit 6, for example. Ellipse C1 and tangent line 40 thus transformed
The data of 3,404 are stored in the RAM 4.

Next, in step S2 of FIG. 1, the y and x coordinates of the origin 410 of the straight lines 403 and 404 parallel to the converted X and Y axes are set to (y0, x0). That is, R
Extract the data of straight lines 403 and 404 from AM4,
The CPU 2 expresses the equation of the straight line 403 as y = yy,
When the straight line 404 is represented by x = xx, y0 ← yy x0 ← xx, which is stored in the RAM 4.

Next, in step S3, the movement reference point P designated by the user is recognized. That is, in FIG. 5, for example, a user sets a movement reference point designated by a pointing device such as a pen, digitizer, or mouse of the input unit 6 or a movement reference point input by a numerical value from the keyboard to P and stores it in the RAM 4. To do.

Next, in step S4, the destination designation point Q designated by the user is recognized. Also, as shown in FIG. 5, a point designated by the user using a pointing device such as a pen, digitizer, or mouse of the input unit 6 or a designated destination point numerically input from the keyboard is set to Q. , RAM4.

Thus, in step S5, when the center of the ellipse C0 is O, the angle θ = ∠POQ is calculated. That is, the data of the movement reference point P, the movement destination designation point Q, and the original ellipse C0 are fetched from the RAM 4, and the CPU 2 calculates the angle θ = ∠POQ when the center of the ellipse C0 is O, and then the RAM 4 stores it. Store.

In step S6, an ellipse C2 (FIG. 6) obtained by rotating the converted ellipse C1 obtained in step S1 in the PQ direction by an angle θ is calculated. That is, the data of the converted ellipse C1 obtained in step S1 is taken out from the RAM 4, and the CPU 2 obtains the data of the ellipse C2 obtained by rotating the ellipse C1 in the PQ direction by the angle θ as shown in FIG. Store.

Specifically, for example, in FIGS. 5 and 6, when the direction of rotation is V = (vector) OP × (vector) PQ,
If the V and Z directions (upward direction perpendicular to the XY plane) are the same, the counterclockwise direction is determined. On the other hand, if the V and Z directions are opposite, the clockwise direction is determined. In the rotation direction determined in this way,
The major axis and minor axis of the ellipse C0 are rotated about the center of the ellipse C0 by an angle θ.

Next, in step S7, the minimum or maximum value (x1, y1) of the x and y coordinates of the thus rotated ellipse C2 is calculated.

The method of calculating the minimum and maximum values of these x and y coordinates will be described below.

First, based on the result determined in the processing of step S1, in case 1, the minimum value (min) x1 of the x coordinate and the minimum value y of the y coordinate of the ellipse C2.
1 In case 2, the maximum value (max) x1 of the x coordinate and the minimum value y of the y coordinate of the ellipse C2.
1 In the case of Case 3, the maximum value x1 of the x coordinate of the ellipse C2 and the maximum value of the y coordinate y1 In the case of Case 3, the minimum value x1 of the x coordinate of the ellipse C2 and the maximum value y1 of the y coordinate are set by CPU2. Calculated and stored in RAM4. (Fig. 7
In the example of FIG. 7, since the ellipse C2 is located in the first quadrant, it corresponds to case 1 described above, and the minimum value x1 of the x coordinate and the minimum value y1 of the y coordinate are obtained.

In order to obtain these coordinate values x1 and y1, the ellipse formula is set to P (t) = C + a.cos (t) + b.sin (t) (0≤t <2 * π), where Where C: center of ellipse, a: major axis vector of ellipse, b: minor axis vector of ellipse, t: parameter, a = (ax, ay), b = (bx, by) P (t) x = ( X (coordinate of P (t)) P (t) y = (y coordinate of P (t)) When ax ≠ 0, x1 = min (P (arctan (bx / ax)) x, P ( arctan (bx / ax) + π) x) (case1, case4) x1 = max (P (arctan (bx / ax)) x, P (arctan (bx / ax) + π) x) (case2, case3) y1 = min (P (arctan (by / ay)) y, P (arctan (by / ay) + π) y) (case1, case2) y1 = max (P (arctan (by / ay)) y, P (arctan (by / ay) + π) y) (case3, case4) When ax = 0, x1 = min (bx, -bx) (case1, case4) x1 = max (bx, -bx) (case2, case3) y1 = min (ay, -ay) (case1, case2) y1 = max (ay, -ay) (case3, case4)

Next, in step S8, the vector V =
(X0-x1, y0-y1) is calculated. That is, x0, x1, y
Each data of 0 and y1 is taken out from the RAM 4, and the CPU 2 calculates the vector V = (x0-x1, y0-y1),
The result is stored in the RAM 4.

Next, in step S9, an ellipse obtained by translating the ellipse C2 by the vector V is set as C3 (FIG. 8).
That is, the data of the vector V and the ellipse C2 is taken out from the RAM 4, and the CPU 2 calculates the data of the ellipse C3 obtained by moving the ellipse C2 in parallel by the vector V, and the RAM 4
To store.

Specifically, when the center of the ellipse C2 is O2 and the center of the ellipse C3 is O3, O3 ← (vector) O2 + (vector) V.

Next, in step S10, the ellipse obtained by rotating the ellipse C3 in the opposite direction to the rotation obtained in step S1 is set as the moved ellipse. This includes data for ellipse C3, angle φ
The value of is taken out by RAM4, and the ellipse C is made by CPU2.
3 is used to calculate the data of the ellipse that is rotationally converted in the opposite direction by the angle φ, and R is used as the data of the ellipse C4 after the movement.
It is stored in AM4 (see FIG. 9).

Next, in step S11, the moved ellipse C4 is displayed on the screen. That is, the ellipse data after movement is R
It is taken out from AM4 and displayed on the screen of the display unit 8. Then, the process proceeds to step S12, and it is determined whether the user continues to issue the movement instruction. That is, by recognizing whether the user is pressing the pointing device or the like of the input unit 6,
It is determined whether the movement instruction is continued. If the movement instruction is continued, the steps from step S4 are executed, and if it is not continued, the ellipse data after the movement is stored in the external storage device 10, and this processing is ended.

As described above, according to the first embodiment of the present invention, an ellipse which is in contact with two vertical lines is rotated while being in contact with two vertical lines so that the angle at which the two lines intersect is maintained. There is an effect that it is possible to easily and accurately input and correct a subtle elliptical shape such as when inputting an elliptical arc. [Second Embodiment] Next, a second embodiment of the present invention will be described. The configuration of the graphic processing device of the second embodiment is basically the same as that of the first embodiment described above.
Since the configuration is the same as that of the embodiment, its description is omitted.

The second embodiment is to easily divide an ellipse into a desired area by designating a division point of the ellipse by a solid angle in an apparatus for processing a two-dimensional figure such as CAD. Hereinafter, this processing will be described with reference to the flowchart in FIG.

First, when the operator clicks and specifies an ellipse for which a division point is to be specified with the pointing device of the input unit 6, the operator proceeds to step S21, extracts ellipse information to be divided, and stores the ellipse information in the RAM.
Store in 4. Next, in step S22, the operator uses the input unit 6 to instruct the start point and end point of the ellipse division. Also, the number of divisions is input from the input unit 6. This represents, for example, the start point 111, the end point 112, and the division section 113 of the division in FIG. 11, and the division points are points on the circumference of the ellipse. Here, the number of divisions is a value that indicates how many divisions the divided section 113 should be divided into, and matches the number of division points to be created. That is, when the number of divisions is designated as "2", the division points coincide with the start point 111 and the end point 112. The division start point 111 and end point 11 thus designated
2 and the number of divisions are stored in the RAM 4, respectively.

Then, in step S23, the operator designates a plane to be divided. This is shown in FIG.
The planes that can be designated are the three most frequently used isometric planes when drawing a three-dimensional drawing, namely the X plane 114, the Y plane 115, and the Z plane 1.
Sixteen. In the division plane extraction step of step S23, the plane instructed upon receiving this is stored in the RAM 4.

When the processing of the above information is completed, step S
In step 24, the division points are calculated and displayed, and the division points are calculated by the CPU 2. First, in the plane extraction step of step S23, the plane information stored in the RAM 4 is referred to, and a 4 × 4 matrix is calculated from the X-axis, Y-axis, and Z-axis direction cosine. The product of this 4 × 4 matrix and the coordinate values of the start point 111 and the end point 112 stored in the RAM 4 in the division method extraction step of step S22 is taken, and each is converted into three-dimensional coordinates. Also, here, the center point of the ellipse is similarly converted into three-dimensional coordinates.

Next, the converted start point 111 and end point 112
Is calculated and divided by the number of divisions stored in the RAM 4 in the division method extraction step of step S22 to obtain the angle β (see FIG. 13). Subsequently, as shown in FIG. 13, a line segment 121 connecting the center point 120 of the ellipse and the start point 111 is defined, and is rotated by an angle β around the center point 120 of the ellipse to the end point 112. The line segment group 122 is obtained. When these line segment groups 122 are obtained, the 4
An inverse matrix of a × 4 matrix is obtained, and the product of the inverse matrix and the calculated line segment coordinates is obtained and converted into a two-dimensional plane. When the conversion to the two-dimensional plane is completed, the intersection of the ellipse stored in the RAM 4 in the ellipse extraction step of step S21 and each line segment of the line segment group 122 obtained this time is obtained on that plane. The point calculated here becomes an ellipse division point at the solid angle. This is displayed on the display unit 8.

As described above, according to the second embodiment,
There is an effect that the division point of the ellipse can be designated by the plane angle and the ellipse can be divided by the solid angle based on the point. [Third Embodiment] In the above-described embodiment, in the plane extraction step of step S23, the planes that can be designated are the three isometric planes most frequently used in drawing a three-dimensional drawing, that is, the X plane, the Y plane.
Although it is assumed that the plane is the Z plane, it may be realized by a three-dimensional lattice point input method as described below. In this case, any plane can be designated.

The processing of the third embodiment of the present invention will be described with reference to FIGS. 14 to 22.

First, in step S31, an initial grid is displayed, for example, as shown in FIG. That is, the grid is displayed on the display unit 8. Here, the line-of-sight vector of the grid points in the (1,1,1) direction.

Next, in step S32, it is determined whether or not an instruction to change the grid has been given. If it is changed, the process proceeds to step S33 to determine the change type, but if it is not changed, the figure type to be drawn is extracted. In step S33, it is determined whether the grid change is translation / rotation / interval change / display / non-display mode switching / adaptive / incompatible mode switching.

If the change type is translation, the process proceeds to step S38, the input translation amount is extracted, and the translation amount input using the keyboard of the input unit 6 or the pointing device is extracted. Then, in the translation process of step S41, based on the translation amount extracted in step S38,
Calculate the grid after translation. And step S4
Then, the process proceeds to step 3, and the grid is redisplayed on the display unit 8 based on the calculated value. At this time, the display on the display unit 8 is as shown in FIG.
The state becomes as shown in 7. In this FIG. 17, with respect to the initial grid of FIG. 16, as translation amounts, X = 15, Y = −4.
This indicates a state in which 5 is designated.

If the change type is rotation in step S33, the flow advances to step S37 to extract the rotation axis input using the keyboard of the input unit 6 or the pointing device. In this case, the rotation axis can be designated as the X, Y, Z axes of the absolute coordinate system and the X, Y, Z axes of the grid plane, or any one axis. Each X,
The Y and Z axes are instructed by a click operation by the pointing device of the input unit 6 or a name input by the keyboard of the input unit 6. In that case, the display color of the specified axis is changed to red. For an arbitrary one axis, for example, a vector is numerically input with a keyboard, or a line segment displayed on the display unit 8 is designated by a pointing device or the like. At this time, if it is an instruction from the keyboard,
A line segment corresponding to the vector is newly generated and displayed in red, and if the click operation is performed using the pointing device, the display color of the clicked line segment is changed to red.

Next, in step S40, the rotation angle input by the input unit 6 is fetched. And step S42
Then, the position of the grid after the rotation is obtained when the grid is rotated based on the rotation axis input in step S37 and the rotation angle input in step S40. Then, in step S43, the grid is displayed again on the display unit 8 based on the calculated value. This time,
The display on the display unit 8 is in a state as shown in FIG. 18, for example. FIG. 18 shows a state where the rotation axis is the grid plane coordinate system Z-axis and the rotation angle is -15 ° with respect to the grid in the state shown in FIG.

If it is determined in step S33 that the change type is a change in the grid interval value, step S33.
Proceeding to 36, the interval value input from the input unit 6 is input. Then, the process proceeds to step S39, and the grid is calculated based on the new interval value based on the interval value input in step S36. Then, in step S43, the grid is displayed on the display unit 8 based on the calculated value.
To display again. At this time, the display result of the display unit 8 is, for example, as shown in FIG. This FIG. 19 shows a state in which the interval value between grids is designated as “30” for the initial grid of FIG.

Further, in step S33, the change type is displayed /
If it is the switching of the non-display mode, the process proceeds to step S35 to determine whether the display state or the non-display state is currently in the RAM.
Determined by the display / non-display flag stored in 4,
If it is in the non-display state, the non-display flag of the RAM 4 is inverted and the process proceeds to step S43 to display the grid. On the other hand, if the display state is not the case, R
The display flag of AM4 is turned off and the display of the grid is erased.

Furthermore, if it is determined in step S33 that the change type is switching between conforming / nonconforming modes, step S34.
To the current state stored in RAM4
The determination is made based on the non-conformity flag, and the state of the flag is inverted to non-conformance if it is a conforming state and to conforming if it is a non-conforming state. At the same time, the value of the conformity / nonconformity flag stored in the RAM 4 is also changed.

When the grid is not changed in step S32 described above, the process proceeds to step S44, and the type of element to be plotted thereafter is selected by the input unit 6. The RAM 4 stores the data representing the type of drawing figure resulting from the selection.

In step S45, it is determined whether the input performed is from the keyboard or the pointing device. If the input is from the keyboard, the process proceeds to step S48 to extract the numerical value input from the keyboard and display the present value. Regardless of the grid displayed on the part 8, the input value is directly recognized as the designated coordinate and R
Store in AM4. On the other hand, when the input is made by the pointing device, the process proceeds to step S47, and the coordinates input by the pointing device on the display unit 8 are extracted. Succeedingly, in a step S49, it is determined whether or not the current state is the grid matching mode by the matching / non-matching flag stored in the RAM 4. As a result of the determination,
If it is the grid fitting mode, the process proceeds to step S50, and if not, the process proceeds to step S51.

In step S50, the grid point closest to the coordinates on the display unit 8 extracted in step S47 is calculated,
The coordinates of that point are recognized as the designated coordinates. Display unit 8 at this time
Is in a state as shown in FIG. In FIG. 20, a cross mark at the bottom of the screen indicates a cursor that is moved by operating the pointing device. Figure 20
In the case of, the closest grid point is calculated as the point in the downward direction of the cursor, and that point is recognized as the designated coordinate and RAM4
To store.

In the grid incompatible mode, step S
In step 51, the coordinates on the display unit 8 extracted in step S47 are recognized as designated coordinates and stored in the RAM 4 as they are.

Thus, the process proceeds to step S52 and the RAM 4
Recognize the designated coordinates stored in
Store in AM4. Here, the element point of a figure is a point that remarkably represents the figure. If it is a line segment, it corresponds to the start and end points, if it is a circle, the center point and one point on the circumference, if it is an arc, the center point and Indicates the start and end points of the arc. These element points change depending on the figure to be drawn, but step S
In 53, it is determined whether or not the designation of the element points is completed in the RAM.
Referring to the drawing figure type stored in 4, it is determined whether all the element points have been designated according to the figure type. If the designation of the element points is not completed, for example, if the figure type is a line segment and it is finished only by designating the start point, the process returns to the determination step of the coordinate designating method in step S45.

When all the element points are designated in this way, the process proceeds from step S53 to step S54, and the figure is displayed on the display unit 8 based on the drawing figure type and each element point stored in the RAM 4, and the RAM 4 is also displayed. Store.

FIG. 21 shows that in the grid fitting mode,
7 shows a display state of the display unit 8 when an arc is drawn by using a pointing device.

FIG. 22 shows an example of a three-dimensional drawing produced by rotating and translating the grid in accordance with this embodiment.

As described above, according to the third embodiment,
There is an effect that a plane to be divided can be designated based on not only the above-mentioned three isometric planes but also any plane.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. The present invention can also be applied to the case where it is achieved by supplying a program for implementing the present invention to a system or an apparatus.

[0057]

As described above, according to the present invention, it is possible to easily and accurately input / correct a subtle elliptical shape.

[0058]

[0059]

[0060]

[Brief description of drawings]

FIG. 1 is a flowchart showing graphic processing according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a graphic processing device of this embodiment.

FIG. 3 is a diagram illustrating components of an ellipse.

FIG. 4 is a diagram illustrating a state in which coordinate conversion is performed so that two straight lines in contact with an ellipse are parallel to the x and y axes.

FIG. 5 is a diagram illustrating a movement rotation angle when an elliptical movement reference point and a movement destination designation point are designated.

FIG. 6 is a diagram illustrating that the ellipse shown in FIG. 4 is rotated by the designated angle as shown in FIG.

FIG. 7 is a diagram illustrating the definitions of the maximum and minimum values of the X coordinate and Y coordinate of the ellipse in FIG.

FIG. 8 is a diagram for explaining parallel translation of the ellipse of FIG. 7 so as to contact a straight line parallel to the x and y axes.

9 is a diagram illustrating a process of returning the ellipse of FIG. 8 to the original coordinate system shown in FIG.

FIG. 10 is a flowchart showing the processing of the second embodiment of the present invention.

FIG. 11 is a diagram showing an example of designation of a start point, an end point, and a division section for an ellipse.

FIG. 12 is a diagram showing an example of a division plane in the second embodiment.

FIG. 13 is a diagram for explaining calculation of division points in the second embodiment.

FIG. 14 is a flowchart showing a processing flow of a third embodiment of the present invention.

FIG. 15 is a flow chart showing a processing flow of a third embodiment of the present invention.

FIG. 16 is a diagram showing a display example of a grid according to the third embodiment.

FIG. 17 is a diagram showing a display example when a grid translation process is performed.

FIG. 18 is a diagram showing a display example when grid rotation processing is performed.

FIG. 19 is a diagram showing a display example when a grid interval changing process is performed.

FIG. 20 is a diagram illustrating coordinate designation on a grid.

FIG. 21 is a diagram showing a state in which an arc is drawn using a pointing device in the grid fitting mode.

FIG. 22 is a diagram showing an example in which a three-dimensional drawing is drawn according to the third embodiment.

[Explanation of symbols]

2 CPU 3 ROM 4 RAM 6 Input section 8 Display 10 External storage device 111 starting point 112 end point Tangent line 401, 402, 403, 404 410 origin

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-192471 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06T 1/00 G06T 11/60-17 / 50 G06T 17/50

Claims (2)

(57) [Claims] 1. A diagram including a storage unit, a display unit, and an input unit.
A figure processing method in a shape processing apparatus , comprising: a reading step of reading an ellipse stored in the storage section and two straight lines which are in contact with the ellipse and which are orthogonal to each other; and the ellipse and the two straight lines read in the reading step are displayed in the display section.
A display step of displaying on the display screen, before in a plane that contains the two lines displayed on the display screen
The step of recognizing the movement reference point designated by the input unit , the step of recognizing the movement destination designated point designated by the input unit on the plane, and the two straight lines being centered on the intersection of the two straight lines. Axis and Y axis
An ellipse and two straight lines rotated so that they are parallel to
A calculation step of calculating, and an angle formed between the center of the ellipse read in the reading step and the movement reference point and the movement destination point are calculated in the calculation step.
Rotation step and, said rotation step and two straight lines parallel to the X-axis and Y-axis respectively orthogonal to each other in contact to the spheroid by rotating step of rotating an ellipse after the rotation was
A step of obtaining a positional deviation from two straight lines in contact with the ellipse before rotation, and a step of moving the position of the ellipse calculated in the calculating step according to the amount of the positional deviation. Rotate the ellipse moved in the moving step by the calculation step
And a step of calculating an ellipse rotated in the opposite direction, and displaying the ellipse calculated in the calculating step on the display screen
Graphic processing method characterized by comprising the steps of, a. 2. Storage means for storing information on an ellipse and information on two straight lines in contact with the ellipse and orthogonal to each other, and information on the ellipse and two straight lines stored in the storage means.
Display control that displays an ellipse and two straight lines on the display screen based on
Means and the two straight lines centering on the intersection of the two straight lines
Ellipse and two straight lines rotated so that they are parallel to each axis
Based on a movement reference point and a movement destination designation point of the ellipse designated by the display control means in a state where the ellipse and two straight lines are displayed on the display screen. The calculation is performed only for the angle formed by the center of the ellipse and the movement reference point and the movement destination point.
Rotation means for rotating the ellipse calculated by the means, and orthogonal to each other contacting the ellipse rotated by the rotation means
2 straight lines respectively parallel to the X-axis and the Y-axis and the rotating means
Means for determining the positional deviation between the two straight lines in contact with the ellipse before rotation by a moving means in accordance with an amount of the positional deviation, moving the position of the elliptic <br/> circles calculated by the calculating means, Rotate the ellipse moved by the moving means by the calculating means
And a means for calculating an ellipse rotated in the opposite direction, and the ellipse calculated by the means for calculating is displayed on the display screen.
A graphic information processing apparatus, comprising: