JP2609611B2 - Drawing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a graphic drawing method, and particularly when there are a plurality of graphic elements that can be selected in an interactive screen input, all of the elements are always drawn on a graphic screen. To a graphic drawing method.

<Conventional technology> NC using automatic programming languages such as APT and FAPT
In an automatic programming system for creating data, (a) points, straight lines, and arcs are defined using simple signals (shape definition), and a part outline shape is defined using these defined points, straight lines, and arcs. (Part definition), and then define a tool path such as a cutting start point, a cutting direction for cutting along the part contour shape, and a cutting end point (movement definition) to create a part program in an automatic programming language, and (b) Then, using the NC data output table, the part program in the automatic programming language is converted into NC data composed of NC data (EIA code or ISO code) in a format that can be executed by the NC device.

Note that the graphic definition is (i) points, straight lines,
A method of inputting data for defining an arc (for example, a point is a point coordinate value, a straight line is a coordinate value of two points, a circle is a center coordinate value and a radius), and (ii) a defined figure is drawn on a display screen. In addition, there is a method of defining another graphic by using the drawn graphic. And in the latter case, the point is the intersection of a straight line and a straight line, the contact point of a straight line and a circle, the intersection of a straight line and a circle,
It is defined as the point of contact between a circle and the intersection of a circle and a circle.

<Problems to be Solved by the Invention> By the way, as shown in FIG. 5, when a point is defined as an intersection of a straight line S _i and a circle C _j , since there are two intersections, which intersection P, Q Must be defined as a point. For this reason, a modifier (R is right, L is left, A is top, and usually indicates whether it is a right intersection or a left intersection, or an upper intersection or a lower intersection.
B is marked with a lower letter).

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

However, conventionally, only one point P is drawn on the display screen CRT (shown by a dotted line) and other points Q are not drawn on the display screen as shown in FIG. And intersections P and Q
There is a problem that it is not possible to accurately determine which one must be selected (specified). For this reason, conventionally, the operator must manually shift the drawing origin on the graphic screen or change the scale to draw both intersection points P and Q on the display screen, and then select and define the desired intersection point as a point. And the definition of the figure is cumbersome.

Although the time of motion content definition it is necessary to identify the cutting direction (cutting paths) and in such case part shape PFIG (see FIG. 7) is closed, cutting starting point P _i Carrara cutting end point P _j
Up to clockwise (CW) or counterclockwise (CCW)
You have to enter what you want to cut. If both cutting paths are drawn on the display screen CRT,
In addition, although the cutting direction (cutting path) can be input accurately, there is a problem that it is impossible to determine in which direction to cut unless one cutting path is drawn as shown in FIG. Conventionally, the operator has to manually change the drawing origin and scale on the graphic screen to draw the part shape PFIG on the display screen, and then select and input a desired cutting path, and then input the motion statement. The definition is cumbersome.

From the above, it is an object of the present invention that there are a plurality of graphic elements (points P and Q in FIG. 6, cutting paths in FIG. 8) that can be selected with respect to the input graphic. The object of the present invention is to provide a graphic drawing system which can automatically draw all graphic elements on the display screen even if at least one of them is not drawn on the display screen.

<Means for Solving the Problems> FIG. 1 is a schematic explanatory view of the system of the present invention.

CRT is Deisupurei screen, S _i is a straight line shape entered, C
_j is the input circle shape, P and Q are the intersections of the straight line and the circle, H and V are the horizontal and vertical dimensions of the display screen, and h and v are the maximum and minimum of all graphic elements (intersections P and Q) to be displayed. The difference between the horizontal axis component and the vertical axis component of the coordinate value.

<Operation> Points are defined using the figures S _i and C _j drawn on the display screen CRT. In this case, it is checked whether there are a plurality of graphic elements (intersection points) P and Q that can be selected with respect to the graphics S _i and C _j already specified and drawn on the display screen. ) Are both drawn on the display screen. If at least one of the elements is not drawn on the display screen, the maximum and minimum values of all graphic elements to be displayed (intersection points P and Q) in each axis direction are checked. Find coordinate values. Next, a difference h between the horizontal and vertical components of the maximum and minimum coordinate values in each of the axial directions is obtained, and a difference v between the vertical components is determined in consideration of each of the differences h, v and the horizontal size H and the vertical size V of the display screen. The scale and the shift amount are determined, and all graphic elements (intersection points P and Q) are drawn on the display screen based on the scale and the shift amount. And
In this state, a predetermined intersection is specified thereafter to define a point.

<Embodiment> FIGS. 1 and 2 are schematic explanatory diagrams of the present invention, and FIG.
FIG. 2 shows an example of drawing all necessary graphic elements (intersection points P and Q) on the display screen by changing the scale and translation, and FIG. 2 shows an example of drawing all necessary graphic elements on the display screen only by parallel movement. .

In FIG. 1 and FIG. 2, CRT is a display screen, S _i is an inputted linear figure, C _j is an inputted circular figure,
P and Q are the intersections of straight lines and circles, H and V are the horizontal and vertical dimensions of the display screen, and h and v are the horizontal and vertical coordinates of the maximum and minimum coordinate values in each axis direction of all graphic elements (intersections P and Q) to be displayed. This is the difference between the axis and the vertical axis components.

FIG. 3 is a block diagram of a graphic display device in an automatic programming system for realizing the present invention.
Is the graphic display side. On the main body of the automatic programming system, 11 is a main processor for performing automatic programming processing, 12 is a keyboard, 13
Is a tablet. In the graphic display device 2, reference numeral 21 denotes a display processor for performing graphic display processing, reference numeral 22 denotes a RAM for storing image data sent from the main processor 11, and reference numeral 23 denotes a video for storing an image for one screen to be drawn on a CRT. RAM, 24 is a timing signal generator for generating horizontal and vertical synchronization signals, etc.
Reference numeral 25 denotes a reading circuit for reading and outputting an image from the video RAM 23, reference numeral 26 denotes a cathode ray tube (CRT), and reference numeral 27 denotes a deflection circuit for deflecting a beam in the horizontal and vertical directions.

FIG. 4 is a flowchart of a graphic display method according to the present invention. Hereinafter, the present invention will be described with reference to FIGS. 1 to 4. Note that the description will be made assuming that a point is defined using a figure drawn on the display screen. Further, data for specifying the drawing origin and scale, graphic data for specifying the straight line S _i , and the circle C _j have already been input from the main processor 11 to the graphic display side 2 and stored in the RAM 22, and the straight lines S _i , Scale with circle C _j specified,
It is assumed that the image is drawn on the display screen (CRT) 26 based on the drawing origin.

The figure S _i drawn on the display screen (CRT) 26,
When the keyboard 12 or the tablet 13 instructs to define a point using C _j (see FIG. 1 or 2), the main processor 11 inputs the fact to the display processor 21.

Thus, Deisupurei processor 21 linearly S _i and circle
It is checked whether two or more intersections exist in C _j, and if there are, the maximum coordinate value and the minimum coordinate value in each axis direction (horizontal direction and vertical direction) are obtained (step 10).
1).

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

However, if any one of the coordinate values is not in the display screen, the axis component of the maximum coordinate value and the minimum coordinate value in the horizontal direction (horizontal direction) is obtained as h, and the maximum coordinate value in the vertical direction (vertical direction) is obtained. The axis component of the value and the minimum coordinate value is obtained and set as v (step 105).

Thereafter, if the horizontal and vertical dimensions of the display screen are H and V, respectively, the display processor 21 checks whether h> H (step 107).
If ≤H, it is checked whether v> V (step 109).
Steps 107 and 109 are processes for determining whether or not all necessary elements (intersection points P and Q) can be drawn on the display screen CRT only by translation without changing the scale.
If h ≦ H, v ≦ V, there is no need to change the scale,
If h> H or v> V, the scale needs to be changed.

h ≦ H, a V ≦ V, if there is no need to change the scale (first reference Figure 2 (a)), the maximum in each axial direction, the coordinate value of the midpoint P _m of the minimum coordinate value (h _m, v It calculates a _m), and then the midpoint P _m of Deisupurei screen center _{P C (H / 2, V} / 2) required to be positioned relative shift amount Delta] h, following equation _{Δv H / 2-h m →} Δh calculating the _{V / 2-v m → Δv} ( step 111).

Thereafter, the relative movement amounts Δh, Δ
Draw figure (Line S _i , Circle C
The position of _j ) is translated and the intersections P and Q are drawn on the display screen (see FIG. 2 (b), step 113). Then, the next operation, for example, designation of one of the intersections is performed.

On the other hand, in steps 107 and 109, h> H or v>
If it is necessary to change the scale to V (see FIG. 1), the relative scale ΔS is calculated by the following equation ΔS = Min (H / h, V / v) (step 115).
Note that the right side of the above equation is the minimum value of H / h and V / v, and is a scale on which all necessary graphic elements (intersection points P and Q) can be drawn on the display screen by translation.

When the relative scale ΔS is obtained, the display processor 21 obtains the maximum and minimum coordinate values in each axis direction after scaling by the relative scale ΔS (step 117), and then, in step 111, the maximum and minimum coordinate values in each axis direction. of calculating the coordinate value of the midpoint P _m, then the relative shift amount Δh required to position the midpoint P _m to the center P _C of Deisupurei screen, finding a Delta] v. Then, if the shift amount is obtained, ΔS
Δ relative to the drawing origin
Translate by h and Δv and draw intersections P and Q on the display screen. Thereafter, the next operation, for example, designation of one of the intersections is performed.

<Effects of the Invention> As described above, according to the present invention, when there are a plurality of graphic elements that can be selected with respect to an input graphic, and when at least one of the graphic elements is not drawn on the display screen, all of the Calculate the scale and shift amount that can draw the graphic elements on the display screen, and draw all the graphic elements on the display screen based on these scales and shift amounts, so that the operator can manually change the scale or Thus, the operability of the interactive input can be improved without the need for the parallel movement.

[Brief description of the drawings]

1 and 2 are schematic explanatory views of the system 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 process of the present invention, and FIGS. It is a fault explanatory view of a prior art. CRT: Display screen, S _i: Input linear figure, C _j: Input circular figure, P, Q: Intersection of straight line and circle, H, V: Horizontal and vertical dimensions of display screen

Claims (1)

(57) [Claims] If there are a plurality of graphic elements which can be selected with respect to an input graphic and at least one of the graphic elements is not drawn on the display screen, the maximum and minimum coordinates of all graphic elements to be displayed. The difference h of the horizontal axis component and the difference v of the vertical axis component of the value are obtained, and the scale and the shift amount are determined in consideration of each difference h, v and the horizontal dimension H and the vertical dimension V of the display screen. A graphic drawing method characterized by drawing all graphic elements on a display screen based on a shift amount.