JPS63310079A - Graphic plotting system - Google Patents

Abstract

PURPOSE:To plot all elements when the plural graphic elements which can be selected are present by deciding a scale and the quantity of shift from the difference of the maximum and the minimum coordinate values of all the graphic elements and the dimension of a display screen. CONSTITUTION:When the plural graphic elements (intersection) P, Q which can be selected with respect to the graphics Si, Cj plotted on the display screen CRT are not plotted, the difference (h) of the horizontal line component of the maximum and the minimum coordinate values in respective axis directions of all the graphic elements P, Q to be displayed and the difference (v) of the vertical line direction thereof are obtained. Then, by considering the respective obtained differences (h), (v), and the horizontal dimension H and the vertical dimension V of the display screen CRT, the scale and the quantity of shift are decided and based on the scale and the quantity of the shift, all the graphic elements P, Q are plotted on the display screen CRT. Under this state, a prescribed intersection is specified thereafter, to define a point.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a graphic drawing method, in particular, when there are multiple graphical elements that can be selected in dialog screen input, all of the elements are always drawn on the graphic screen. Concerning graphic drawing methods.

<Prior art> In automatic programming systems that create NC data using automatic programming languages such as APT and FAPT, 1M) Define points, straight lines, and arcs using simple symbols (shape definition! I), Use these defined points, straight lines, and arcs to define the part outline shape! l) Next, define the tool path such as the cutting start point, the cutting direction for cutting along the part contour shape, and the cutting end point (motor vehicle definition), and create a part program using an automatic programming language. (b) After cutting , converts a part program written in an automatic programming language into NC data consisting of NC data (EIA code or 130 code) in a format that can be executed by the NC device using the NC data output table.

In addition, figure definition can be done by (1) inputting data directly from the keyboard to define a point, line, or arc (for example, a point is a point coordinate value, a straight line is a coordinate value of two points, and a circle is a center coordinate value). (radius), (iil) There is a method of drawing a defined figure on both sides of the display and then using the drawn figure to define another figure.In the latter case, the points are drawn between straight lines and straight lines. It is defined as an intersection, a point of contact between a straight line and a circle, a point of intersection between a straight line and a circle, a point of contact between a circle and a circle, a point of intersection between a circle and a circle, etc.

<Problems to be solved by the invention> By the way, the fifth problem
As shown in the figure, when a point is defined as the intersection of a straight line S and a circle C, since there are two intersections, it is necessary to specify which of the intersections P and Q should be defined as a point. For this reason, modifiers are usually used to indicate whether the intersection is on the right or left, or on the top or bottom (R for right, L for left, A for top, B below) to distinguish them.

In such a case, if both the intersection points P and Q are drawn on the display screen, the operator can accurately determine and input which intersection point is to be defined as a point.

However, in the past, depending on how the drawing origin was set or the scale, only one point P was drawn on the display screen CRT (indicated by a dotted line) as shown in FIG.
The intersection point P may not be drawn on the display screen.
, Q to be selected (specified) cannot be determined accurately. For this reason, in the past, the operator manually shifted the drawing origin on the graphic screen or changed the scale to draw both receiving points P.

It is necessary to draw Q on the display screen and then select and define the desired intersection as a point, making graphic definition cumbersome.

In addition, when defining a motion statement, it is necessary to specify the cutting direction (cutting path), but in such a case, if the part shape PFIG (see Figure 7) is hammered, the cutting direction from the cutting start point P to the cutting end point P, You must input whether to cut clockwise (cw) or counterclockwise (CCW).

If both cutting paths are drawn on the display screen CRT, the cutting direction (cutting path) can be input easily and accurately, but if one cutting path is not drawn as shown in Fig. There was a problem in that it was not possible to judge whether to cut in the direction of . Conventionally, the operator had to manually change the drawing origin and scale on the graphic screen, draw the part shape PFIG on the display screen, and then select and input the desired cutting path. Definition is becoming difficult.

From the above, an object of the present invention is to provide a plurality of graphical elements (points P and Q in the case of FIG. 6, cutting passages in the case of FIG. 8) that can be selected with respect to the inputted graphical To provide a graphic drawing method that can automatically draw all graphic elements on a display screen when even one of them is not drawn on the display screen.

Means to solve problems〉 FIG. 1 is a schematic explanatory diagram of the system of the present invention.

CRT is the display screen, Sl is the input linear figure, C is the input circular figure, P, Q are the intersections of the straight line and the circle, H
, V are the horizontal and vertical dimensions of the display screen, and h and v are the differences in the horizontal axis components and the vertical axis components of the maximum and minimum coordinate values of all graphical elements (intersections P, Q) to be displayed.

Figures S,,C drawn on the display screen CRT
, shall be used to define a point. In this case, the figure S, which has already been specified and drawn on the display screen, is
Multiple graphical elements (intersections) P, Q that can be selected with respect to C.
If so, check if the elements (intersections) are both drawn on the display screen, and if one of the elements is not drawn on the display screen (if not drawn on the m-plane, the Power all geometric elements (intersection P, Q)
Find the maximum and minimum coordinate values in each axis direction.

Next, the difference in the horizontal axis component and the difference V in the vertical axis component of the maximum and minimum coordinate values in each axis direction are determined, and each difference h, v
The scale and shift amount are determined in consideration of the horizontal dimension H and vertical dimension V of the display screen, and all graphical elements (intersections P and Q) are drawn on the display screen based on the scale and shift amount.

Then, in this state, a predetermined intersection point is specified and the point is defined.

<Example> Figures 1 and 2 are schematic explanatory diagrams of the present invention, and Figure 1 is an example of drawing all graphical elements (intersections P and Q) necessary on the display screen by changing the scale and moving in parallel. , FIG. 2 is an example in which all necessary graphic elements are drawn on the display screen only by parallel movement.

In Figures 1 and 2, CRT is the display screen, S is the input straight line figure, CJ is the input circular figure, P and Q are the intersections of the straight line and the circle, H and V are the sides of the display screen, Vertical dimensions, h and v are all graphical elements to be displayed (intersection P
, Q) is the difference between the horizontal axis and vertical axis components of the maximum and minimum coordinate values in each axis direction.

FIG. 3 is a block diagram of a graphic display device in an automatic programming system that implements the present invention, where 1 is the main body side of the automatic programming system and 2 is the graphic display side. On the main body side of the automatic programming system, 11 is a main processor that performs automatic programming processing, 12 is a keyboard,
13 is a tablet. In the graphic display device 2, 21 is a display processor that performs graphic display processing, and 22 is a RAM that stores image data sent from the main processor 11.
, 23 is a video RAM that stores one screen worth of images to be drawn on a CRT, 24 is a timing signal generator that generates horizontal and vertical synchronization signals, etc., 25 is a reading circuit that reads and outputs images from the video RAM 23, and 26 is a Brown'1 (
CRT), 27 is an inter-ring circuit that deflects the beam in the horizontal and vertical directions.

FIG. 4 is a flow chart of the processing of the graphic display method according to the present invention. The present invention will be explained below with reference to FIGS. 1 to 4. The following description assumes that points are defined using figures drawn on the display screen. Furthermore, data specifying the drawing origin and scale as well as graphic data specifying the straight line S12 and the circle C4 have already been input from the main processor 11 to the graphic display side 2 and stored in the RAM 22.
Furthermore, the straight line sS1 and circle C3 are displayed on the display screen (C
RT) 26.

The keyboard 1z is used to define points using the figures S, C, drawn on the display screen (CRT) 26 (see FIG. 1 or FIG. 2).
3, the main processor 11 inputs the instruction to the display processor 21.

As a result, the display processor 21 checks whether there are two or more intersections between the straight line @S and the circle C, and if so, determines the maximum coordinate in each axis direction (horizontal and vertical direction) among all the intersections. Find the value and minimum coordinate value (step 101).

Next, the display processor 21 checks whether the maximum and minimum coordinate values are all within the display screen, and if so, waits for the next operation (step 103).

However, if any one coordinate value is not within the display screen, the axis components of the maximum and minimum coordinate values in the horizontal direction (horizontal direction) are determined and set as h, and the vertical direction (
The axis components of the maximum coordinate value and minimum coordinate value in the vertical direction) are determined and set as V (step 105).

After that, the display processor 21 checks whether h>H, assuming that the horizontal and vertical dimensions of the display screen are H and V, respectively (step 107).
, hSH, check whether v) is V (step 109). In addition, in steps 107 and 109, the necessary elements (intersection P, Q
) can all be drawn on the display screen CRT.If h≦H, v5V, there is no need to change the scale.If h>H or v)V, it is necessary to change the scale. There is.

If h≦H, v≦V and there is no need to change the scale (see FIG. 2(a)), the midpoint of the maximum and minimum coordinate values in each axis direction is P9. The coordinate values (h,, v,) of are calculated, and then the midpoint P is calculated. Center P of the display screen. (H
/2. Relative shift amount Δh required to position at V/2)
, ΔV are calculated using the following formula (Step 111).

Thereafter, the relative movement amount Δh obtained in step 111,
The drawing figure (straight line Sl
Translate the position of 2 circles C, ) and draw the intersections P and Q on the display screen (see Figure 2 tbl, step 1)
13). Thereafter, the operation of the method, for example, designation of one of the intersection points, is performed.

On the other hand, in steps 107 and 109, if h>H or v>v and it is necessary to change the scale (the first
(see figure), calculate the relative scale ΔS using the following formula (% formula %) (step 115)
. The right side of the above equation is the minimum value of H/h and V/v, and all necessary graphic elements (intersection P,
Q) is the scale drawn on the display screen.

When the relative scale ΔS is determined, the display processor 21 determines the maximum and minimum coordinate values in each axis direction after scaling by the relative scale ΔS (step 117), and
, After that, in step 111, the coordinate values of the midpoint P6 of the maximum and minimum coordinate values in each axis direction are calculated, and the midpoint P6 is then set as the center P of the display screen. The relative shift amounts Δh and ΔV necessary to position the target are calculated. Once the shift amount is determined, the figure scaled by ΔS is translated in parallel by Δh and ΔV relative to the drawing origin, and the intersections P and Q are drawn on the display screen. After that, the next operation, for example, specifying one of the intersection points, is performed.

<Effects of the Invention> According to the present invention, if there are a plurality of graphical elements that can be selected regarding an inputted figure, and even one of the graphical elements is not drawn on the display screen, all of the graphical elements are automatically selected. The scale and shift amount that can draw graphical elements on the display screen are calculated, and the configuration is configured so that all graphical elements are drawn on the display screen based on these scales and shift amounts. There is no need to move or move in parallel, making it possible to improve the operability of human interaction.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of the method of the present invention, FIG. 3 is a block diagram of a graphic display device in an automatic programming system, FIG. 4 is a flowchart of the processing of the present invention, and FIGS. 5 to 8 The figure is a diagram illustrating the drawbacks of the prior art. CRT...Display screen, S...Input linear figure, C...Input circular figure, P, Q...Intersection of straight line and circle, H, V...Horizontal and vertical dimensions of display screen, patent Applicant Fanuc Co., Ltd. Agent
Patent Attorney Chiki Saito Figure 1 Figure 5 - Figure 61

Claims (1)

[Claims] If there are a plurality of graphical elements that can be selected for the inputted graphic, and even one of the graphical elements is not drawn on the display screen, the maximum and minimum of all graphical elements to be displayed are Find the difference h in the horizontal axis component and the difference v in the vertical axis component of the coordinate values, and calculate each difference h, v and the horizontal dimension H and vertical dimension V of the display screen.
A graphic drawing method characterized by: determining a scale and a shift amount in consideration of the above, and drawing all graphic elements on a display screen based on the scale and shift amount.