JPH0664589B2 - Drawing method in CAD system - Google Patents

Description

TECHNICAL FIELD The present invention uses a computer to design a machine or device on a screen of a graphic display device, and CAD.
(Computer aided design) system.

CRT of graphic display device using a computer
A CAD system that draws a drawing on a screen and draws a drawing is conventionally known.

A conventional CAD system employs a method of designating an image by designating a coordinate position on a CRT screen of a graphic display device with a cursor. As means for reading the dimensions of the drawn screen, a line grid 31 and a dot grid 3 are displayed on a CRT screen as shown in FIGS. 21 and 22.
Draw 2 to read the dimensions, move the cursor,
A method of digitally displaying the movement amount on the screen and reading it is used.

Problems to be Solved by the Invention The method of drawing one cursor on the CRT screen and drawing with this one cursor may be inconvenient in drawing, and a sufficient function cannot be achieved. Also, FIG. 21 and FIG.
As shown in Fig. 2, the method of drawing a grid on the entire CRT screen may be convenient during drawing, but
Sometimes this grit gets in the way and is inconvenient.

Therefore, an object of the present invention is to draw two cursors to facilitate drawing, and further to provide a drawing method in a CAD system in which dimensions can be easily read and drawing is easy.

Another object of the present invention is to provide a drawing method in a CAD system capable of measuring the angle of a drawing drawing.

Means for Solving the Problems In a CAD system for drawing a drawing on a display screen of a graphic display device using a computer, when a cursor position designation input is made, a cursor is drawn and fixed at the input position. Then, when a cursor movement command is input, the length dimension between the two cursor positions is numerically displayed while splitting the fixedly drawn cursor and drawing and moving the new cursor. The coordinate positions of the two cursors are also displayed numerically, and when there is a cursor position specification input, a new cursor is fixedly drawn at the specified position and a straight line is drawn between the original cursor position and the new cursor position. Delete the original cursor so that you can draw.

In particular, the cursor is composed of two linear axes orthogonal to each other, and when a cursor rotation command is input, the cursor is rotated in the commanded direction around the intersection of the two linear axes, and the rotation angle is displayed. .

Further, marks are drawn on the entire circumference of the display screen at predetermined intervals, and the cursor is composed of two linear axes which are drawn on the entire display screen, and the drawing dimension is measured by the cursor and the marks. It can be so.

Further, when the cursor is divided and two cursors are drawn, the length dimension between the corresponding linear axes of the two rotated cursors is displayed as a numerical value. Furthermore, the dimension line is also displayed at the same time. Alternatively, when the cursors are split and two cursors are drawn, the distance between the intersections of the corresponding linear axes of the two cursors and the mark drawing line is determined by the rotation angle of the cursors. Change mark spacing to indicate vertical distance. Further, when the cursor is divided and two cursors are drawn, the marks at the predetermined intervals are drawn between the corresponding linear axes of the two rotated cursors in parallel with the other linear axis, and the dimensions of the drawing are drawn. Make it easy to grasp.

When the position P1 of the cursor is designated, the cursor A is drawn on the CRT screen as shown in FIG. 1 (i), and when the cursor movement command is further input, the cursor is displayed as shown in FIG. 1 (ii). Cursor B splits from A, cursor A
Is held at the designated position P1 and only the cursor B moves. Then, the length between the cursor A and the cursor B is displayed numerically. When the cursor B is moved to the desired position P2 and the position designation is input, the cursor A disappears from the CRT screen, a straight line 1 is drawn between the points P1 and P2, and the cursor B is held at that position. .

Next, when a cursor movement command is input, the cursor B is fixed at the position P2, the cursor is split from the cursor B, and the split cursor is moved as described above. In the same manner, the original cursor can be erased while drawing a line between the two cursors, and lines can be drawn sequentially.

Further, as shown in FIGS. 2 (i) and (ii), when the cursor A composed of orthogonal axes is designated and then a rotation command is inputted, the rotation angle θ of the cursor A is calculated and displayed. Thereby, the angle between the drawing lines can be measured.

Further, as shown in FIGS. 3 (i) and (ii), marks are provided at predetermined intervals on the entire circumference of the CRT screen (marks shown by line segments in FIG. 3 (i), dots in FIG. 3 (ii)). Mark M is drawn, and if necessary, the mark is attached to the mark and displayed as shown in FIG.

Then, as shown in FIG. 5, when a cursor composed of orthogonal axes is drawn on the entire CRT screen, the drawn 2
The distance between the corresponding axes of the two cursors A and B can be detected by the mark M, and the actual length can be detected by setting the length of the mark interval to a set unit amount. Furthermore, when the cursor is rotated, as shown in FIG. 6, numerical values indicating the dimension lines 10 and 11 between the corresponding axes AX-BX and AY-BY of the two cursors A and B and the distances LX and LY therebetween. Is displayed. Thus, the length of the drawn line P1P2 is measured. In particular, as shown in FIG. 7, when the cursor B is moved along one axis (the AX axis in FIG. 7) of the rotated cursor A, the numerical value indicating the distance LX between the axes AY and BY is the cursor. The length between the centers P1 and P2 of A and B is represented, and the length of the drawing line P1P2 can be detected from the screen together with the dimension line.

Marks are displayed between the corresponding axes of the two cursors A and B in parallel with the other axis as shown in FIG. 8, and the vertical distance between the corresponding axes (distance between points P1P2 in FIG. 8) is displayed. )
Can be measured using the mark M. Further, as shown in FIG. 9, the vertical distance between the corresponding axes is represented by the distance between the corresponding two axes and the intersection point on the mark drawing line.
The vertical distance between corresponding axes can be measured by changing the drawing interval of. In the example shown in FIG. 9, the point P
The distance between the marks P and P2 is drawn between the points P3 and P4 by adjusting the interval of the marks M.

Embodiment FIG. 10 is a block diagram of essential parts of a CAD system for carrying out an embodiment of the present invention.

In the figure, reference numeral 1 is a microcomputer (hereinafter referred to as MPU) including a central processing unit, a memory such as ROM and RAM, an input / output circuit, and a floppy disk.
A graphic display device 2, a mouse 3, a keyboard 4, a printer 5 and a fixed disk device 6 are connected to U1, and a tablet 7, an XY plotter 8 and a digitizer 9 are further connected via an RS-232C interface. ing. These configurations are the same as those in the conventional CAD system, and the details are omitted.

In the above configuration, the drawing method according to the present embodiment is the eleventh embodiment.
This will be described together with the operation of the MPU 1 shown in the flowcharts of FIGS.

First, when the CAD system is powered on, the MPU
1 performs initialization (step 100), and initializes the center position of the CRT screen on the graphic display device 2 as the origin (0, 0) of the screen. Also, the register R1 for storing the display coordinate position of the cursor and the register RM for storing the position of the mouse 3 are set to the initial display position (0, 0), and "0" is set to the register R2 for storing the rotation angle of the cursor. To do. Then, once all the display on the CRT screen is erased (step 101), and then the display process of the mark M shown in FIGS. 3 (i) and (ii) (step 1).
02) is performed, but this mark M is called a position in this embodiment. In this position display processing, as shown in FIG. 12, first, the currently displayed position M (not displayed in the initial state) is erased (step 20).
0), the coordinates of each position M display is calculated based on the origin (0, 0) of the CRT screen (step 201), and each position M is displayed (step 202). Then, the registers R1 and RM that store the coordinate positions of the cursor and the mouse
Is updated based on the change in position M (step 2
03), in the first case, the position M is drawn based on the center (0, 0) of the CRT screen, the origins (0, 0) are stored in the registers R1 and RM, and the position, the cursor, and the coordinate position of the mouse are Since they match, this coordinate position updating process is not performed at all. In the initial state, positions M are drawn around the CRT screen at intervals set with the center position of the CRT screen as the origin. Next, the cursor is drawn on the basis of the registers R1 and R2 that store the cursor position and the angle. Hereafter, the cursor before the cursor is split into two is the cursor A, and the cursor after the split is the cursor B. According to this definition, since the cursor A has the register R1 (0, 0) and the register R2 has "0", the axis parallel to the horizontal axis (horizontal axis) of the CRT screen with the center of the CRT screen as the intersection point. An (X axis) and a vertical axis (hereinafter, Y axis) are drawn on the entire CRT screen (step 103). Then, a subroutine for displaying various kinds of information about the cursor is called (step 104), and information about the cursor is displayed (step 300). The information displayed here is the register R1,
The information of R2, that is, the cursor position and the cursor rotation angle are displayed. However, when only the cursor A before the cursor is divided is drawn, the position and the rotation angle of the cursor A are displayed, and after the division. The position of the cursor B and the rotation angle are displayed. As will be described later, the distance between the cursor A and the cursor B and the X-axis (horizontal axis) of the cursors A and B,
The distance between on the Y axis (on the vertical axis) is also displayed. Next, MP
U1 reads the status of mouse 3, and registers RM of mouse 3
If the mouse 3 has moved, the coordinate position of the mouse 3 is stored in the register R1, and it is determined whether the left button of the mouse 3 has been pressed (steps 105 to 107). .

While the MPU 1 repeats the processing of steps 105 to 107, the operator draws a line which is a reference for drawing, that is, a reference line. The reference line is a drawing line as shown in FIG. The reference line of the drawing, for example, a line 21 parallel to the X axis and a line 22 parallel to the Y axis drawn as a reference line when drawing the component indicated by the reference numeral 20.

The drawing of this reference line is performed as an interrupt process on the tablet. There are three interrupt processes for drawing the reference line, and when drawing the reference line only in the X-axis direction (drawing the reference line indicated by reference numeral 21 in FIG. 20), the SETDD shown in FIG.
L1 is designated and a reference line in the X-axis direction is designated (step 600). Further, a reference line only in the Y-axis direction (for example, the second line
When the reference line 22) in FIG. 0 is designated, SETDDL2 shown in FIG. 17 is designated, and the reference line in the Y-axis direction is designated (step 700). When setting the reference lines for both the X axis and the Y axis, SETDDL3 shown in FIG. 18 is specified, and the reference lines in the X axis direction and the Y axis direction are specified (step 800).

Thus, when the reference line is designated, the subroutine POJ
Call ISHIYON (steps 601, 701, 8
01), the above-described position display, cursor, and mouse coordinate position update processing is performed. In this case, the origin of the position M in the X axis direction is the reference line in the Y axis direction (for example, the reference line 22 in FIG. 20), and the origin of the position M in the Y axis direction is the reference line in the X axis direction (for example, Reference line 21 in FIG. 20)
Position. For example, reference lines 21 and 2 in the X-axis and Y-axis directions
When 2 is specified, the origin (0,0) of the position M is the intersection of the reference lines 21 and 22. If only the reference line in one direction of the X-axis or the Y-axis is designated, only one position origin is adjusted so that the designated reference line becomes "0". In addition, a reference line (for example, FIGS.
When 2) is specified and the origin of the position M moves, in step 203, the cursor A and the mouse 3 currently being drawn are drawn.
The values of registers R1 and RM that store the coordinate position of the
The central coordinate position (0, 0) is rewritten to the coordinate position with the reference line position as the origin, and the cursor and mouse coordinate positions matched with the coordinate system of the drawing position M are stored.

Thus, with the position M, the reference line 21 or 22, and the cursor A being drawn, the operator operates the mouse 3
When is moved, the MPU 1 stores the value of the mouse coordinate position register RM in the register R1, and draws the cursor A at the stored coordinate position (step 103).
Various information of the cursor at this time is displayed (step 1
04, 300).

In this way, the operator moves the mouse 3 to move the cursor A to a desired position. When the operator presses the left button of the mouse 3 after deciding the position of the cursor A (step 106), the MPU1
Stores the current coordinate position of the mouse 3, that is, the coordinate position of the cursor A stored in the register R1 in the register R3 for line display (step 109). And mouse 3
The state is read and the left and right buttons of the mouse 3 are repeatedly pressed to determine whether the mouse 3 has moved (steps 110 to 112). If the mouse 3 has moved, the coordinate position of the mouse 3 (register RM value) to register R
1 and stores the cursor B and the rubber band l ′ (the cursor B and the rubber band l ′ are not drawn before the cursor is divided) (step 11
3), displaying the split cursor B at the cursor position stored in the register R1, and displaying the coordinate position of the cursor A stored in the register R3 in step 109 and the coordinate position of this cursor B (the coordinate position stored in the register R1). A rubber band l'is displayed as a temporary line between them (step 114). As a result, as shown in FIG. 5, two cursors A and B are drawn on the CRT screen, and a rubber band 1'is drawn between the cursors A and B. The value of the register R2 that stores the rotation angle of the cursor (the rotation angle of the cursor A is stored before the cursor is split, and the rotation angle of the cursor B is stored after the split) is the initial value "0".
It is determined whether or not (step 115), if there is no rotation at the initial value, the distance between the cursors A and B is calculated (step 11).
6). That is, in the example shown in FIG. 5, the distance between the points P1 and P2 is calculated. This is the register R3 in step 109.
Points P1 and P depending on the coordinate position P1 of the cursor A stored in the memory and the coordinate position P2 of the cursor B stored in the register R1.
Calculate the distance between the two.

That is, the coordinate position of the point P1 is (X1, Y1), and the point P2 is
If the coordinate position of is (X2, Y2), the distance on the X axis |
X2-X1 |, the distance on the Y-axis | Y2-Y1 |, and the length {(X2-X1) ² + (Y2-Y1) ² } ^1/2 of the rubber band l ′ are calculated,
Distance on X-axis, Y-axis | X2-X1 |, | Y2-Y1
|, The length of the rubber band l ', and the coordinate positions of the cursors A and B are displayed (steps 117 and 300), and the process returns to step 110.

Hereinafter, each processing of steps 110 to 117 is repeated,
Every time the mouse 3 is moved, the display of the cursor B is moved, and the coordinate positions of the cursors A and B, the length of the rubber band l ', etc. are displayed. As a result, the operator determines the length of the rubber band 1'by the displayed value, and the distance between the cursors A and B in the X-axis direction and the Y-axis direction by the displayed values, or as shown in FIG. It can also be detected by the position as shown, and the line to be plotted can be managed.

Thus, the cursor B is moved to draw the rubber band l ', the operator positions the cursor B, and the mouse 3
When the left button of is pressed (step 111), the MPU 1 calls the subroutine PULINE, starts the processing shown in FIG. 14, and fixedly draws the rubber band l'as the drawing line 1 (step 400) and the cursor. A
Is erased and only cursor B is drawn (step 40
1). Thereafter, this cursor B will be used as a new cursor A. Then, the coordinate position of the new cursor A, that is, the current value of the register R1 is stored in the line display register R3 (step 402),
Return to the main routine. Thereafter, in the same manner, the sequential line l
Drawing (see FIG. 1 (iii)) is performed.

On the other hand, when it is detected in step 111 that the right button of the mouse 3 has been pressed, the cursors A and B and the rubber band l'are erased, and the process returns to step 103 to draw the cursor A at the coordinate position stored in the register R1. (This cursor A is drawn at the position of the cursor B displayed before pressing the right button of the mouse 3). Hereinafter, the processes of steps 103 to 108 described above will be repeated.

On the other hand, when the cursor is rotated, the cursor rotation command SPN is selected by the tablet 7 and the cursor rotation command SPN is executed in the interrupt process.
This rotation command of the cursor causes the cursor B to split before the cursor splits, that is, after the cursor A = B splits.
This rotation command is the target of rotation. When the cursor rotation command SPN is input, the MPU 1 starts the processing shown in FIG. 19, and when the left button of the tablet 7 is pressed (step 900), the cursor (A = B, B)
The set angle is added to the value of the register R2 that stores the rotation angle of (step 901), and the set angle is subtracted from the value of the register R2 if the right button is pressed (step 902). The cursor (A = B, B) that has been displayed so far is erased (step 903), and then the cursor (A = B, B) of the new rotation angle stored in the register R2 is drawn (step 904). ), The subroutine DILAY is called (step 905), and the cursor coordinate position and the cursor rotation angle are displayed. Then, when the mouse 3 is moved (steps 112 to 114), the cursor is split, the cursors A and B are drawn as shown in FIG. 6, and the rubber band 1'is also drawn. Then, in step 115, it is determined whether or not the value of the register R2 that stores the rotation angle of the cursor is the initial value "0", and it is determined whether or not the cursor is rotated.

If the cursor is rotating, MPU1 will execute subroutine S
UNPOU is called (step 120) and the processing shown in FIG. 15 is started. First, between the corresponding axes AX and BX of the two cursors A and B, between AY and BY, the position of 10 dots from the right side of the CRT screen and the position of 10 dots from the bottom side are determined according to the rotation angle of the cursor. The dimension lines 10 and 11 are drawn as shown in FIG. 6 (step 500), and the lengths LX and LY between the axes are calculated and drawn (step 501). The lengths LX and LY between the axes are coordinate positions P of the cursors A and B.
1, P2, the angle θ2 from the horizontal line of the rubber band l '
And the rotation angle θ1 of the cursors A and B from this angle θ2
Is calculated by subtracting (the rotation angle is the counterclockwise rotation plus,
Since the clockwise direction is negative, θ2-(-θ1)
= Θ2 + θ1), the lengths LX and LY between the axes are obtained from the obtained angle and the length of the rubber band l '.

As described above, when the cursors are rotated, the length between the corresponding axes of the two cursors is drawn together with the dimension line.

In this embodiment, the subroutine S of step 120 is performed.
In UNPOU (see FIG. 15), the dimension line and the length between the axes are drawn between the axes, but the mark M may be drawn instead of the dimension line as shown in FIG.

Furthermore, as shown in FIG.
The intersection P between the drawing line of the mark M and the axes AY and BY in the figure
The distance between the marks M may be changed so that the distance between the axes P3 and P4 corresponds to the length between the corresponding axes (the length of the rubber band 1'in the example of FIG. 9).

According to the present invention, when the cursor is positioned at the starting point of a straight line to be drawn, the cursor is fixed at that position, and when a cursor movement command is input, the cursor is split from the fixed cursor and drawn. The linear dimension between the two cursors is displayed. If you move the split cursor and position it at the end of the straight line you are trying to draw, a straight line will be drawn between the original cursor and the split cursor, and
The original cursor is erased. Since a straight line will be drawn by this similar process below, the starting point and the end point of the drawn straight line should be clearly indicated by the two cursors, and the length between the two cursors should be displayed numerically. By doing so, it is possible to draw while controlling the length of the straight line, which facilitates drawing.

Furthermore, when a rotation command is given and the cursor is rotated, the rotation angle is drawn, which is convenient when drawing a straight line at an angle between the drawn straight lines or at a predetermined angle from a certain straight line.

In addition, marks are drawn on the entire circumference of the CRT screen at predetermined intervals,
By using a cursor composed of orthogonal linear axes drawn on the entire CRT screen, the length between the two cursors can be measured by the mark.

Furthermore, since the distance between the two cursors in the X-axis (horizontal) and Y-axis (vertical) directions and the length between the corresponding axes of the two cursors can be displayed, it is possible to draw while controlling the dimensions. And it is possible to draw efficiently.

[Brief description of drawings]

1 (i), (ii) and (iii) are explanatory views for explaining the operation principle of the present invention, and FIGS. 2 (i) and (ii) are operation explanations for angle measurement by cursor rotation of the present invention. FIGS. 3 (i) and 3 (ii) are diagrams showing an example of the mark display of the present invention, and FIG. 4 is a diagram showing an example of displaying mark numbers for the marks of the present invention. FIG. 6 is a diagram showing an example in which a straight line is drawn while controlling dimensions by a mark according to the present invention, and FIGS. 6 to 9 are explanatory views when a straight line is drawn by rotating a cursor according to the present invention, FIG. 10 is a block diagram of essential parts of a CAD system of one embodiment for carrying out the present invention, FIGS. 11 to 19 are operation process flowcharts in the same embodiment, FIG. 20 is an explanatory diagram of a reference line, 21 and 22 are explanatory views of grid display in the conventional CAD system. A, B ... Cursors, P1, P2 ... Coordinate positions of cursors A and B, M ... Mark (position), l '... Rubber band, l ... Drawing line, AX, AY ... Linear axis of cursor A, BX, BY ... Linear axis of cursor B, 10, 11 ... Dimension line, 20, 21 ... Reference line.

Continuation of the front page (56) Reference JP-A-63-284678 (JP, A) JP-A-62-212778 (JP, A) JP-A-60-230269 (JP, A)

Claims (8)

[Claims] 1. A CAD system for drawing a drawing on a display screen of a graphic display device using a computer, when a cursor position designation input is made, a cursor is drawn and fixed at the input position, When a cursor movement command is input, a fixed cursor is split and a new cursor is drawn and moved. The length dimension between two cursor positions is displayed numerically. A drawing method in a CAD system in which a cursor is fixedly drawn at a specified input position, a straight line is drawn between an original cursor position and a new cursor position, and the original cursor is erased to draw. 2. A drawing method in a CAD system according to claim 1, wherein the length dimension between two cursor positions is displayed numerically, and the coordinate positions of the two cursors are displayed numerically at the same time. 3. The cursor is composed of two orthogonal linear axes, and when a cursor rotation command is input, the cursor is rotated in the commanded direction around the intersection of the two linear axes and the rotation angle is displayed. CA according to claim 1 or claim 2
Drawing method in D system. 4. A mark is drawn around the entire circumference of the display screen at a predetermined interval, and two linear axes perpendicular to the cursor are constituted by a cursor drawn on the entire display screen, and a drawing dimension is formed by the cursor and the mark. The drawing method in the CAD system according to claim 1, claim 2 or claim 3, which is capable of measuring. 5. The CAD according to claim 4, wherein when the cursors are split and two cursors are drawn, the length dimension between the corresponding linear axes of the two rotated cursors is displayed numerically.
System drawing method. 6. The drawing method in a CAD system according to claim 5, wherein the numerical value of the length dimension between the axes is displayed together with the dimension line. 7. When the cursor is divided and two cursors are drawn, the distance between the intersections of the corresponding linear axes of the two cursors and the mark drawing line depends on the rotation angle of the cursors.
The method of drawing in a CAD system according to claim 4, wherein the mark spacing is changed to indicate a vertical distance between the two corresponding linear axes. 8. The mark according to claim 4, wherein when the cursor is split and two cursors are drawn, marks at predetermined intervals are drawn between the corresponding linear axes of the two rotated cursors in parallel with the other linear axis. Drawing method in CAD system.