JPH0721398A - Graphic plotting device - Google Patents

Abstract

PURPOSE:To check the presence of the part overlapped with the graphic image such as the other road when a new graphic image of roads is plotted at the required position and to plot the graphic image automatically corrected accord ing to the result. CONSTITUTION:When the required position is designated and plotting graphic is designated, a plotting data generating device 1 checks whether or not the picture is overlapped with the other plotting data and when the overlapped part is found, the corrected plotting data are generated so as not to be plotted on the overlapped part. Plotting picture is performed based on the corrected plotting data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic drawing device capable of drawing and displaying a plurality of graphic images.

[0002]

2. Description of the Related Art Conventionally, in a graphic drawing device capable of drawing and displaying a plurality of graphic images, for example, when a road map having a road width is to be created, a straight line graphic is first designated and the straight line graphic image is displayed. The graphic image of the desired map was displayed by drawing each one.

[0003]

In the case of sequentially drawing the graphic images of the road map as described above, the graphic image of the road having the road width already drawn and the straight line which is the graphic image to be drawn from now on are drawn. May overlap each other. For example, a thick (wide) road (represented by two straight lines) and a thin (narrow) road (represented by one straight line) are almost perpendicular to each other. This is the case when passing through in a state.

In such a case, first draw a thick road,
If you want to draw a thin road (the reverse is the same), simply draw the straight line by specifying the start and end points of the thin road. Since and are drawn and displayed on top of each other, it was displayed as if a thin road were passing over a thick road.

In order to prevent such a display, conventionally, in a portion where a thin road and a thick road overlap, after drawing a thin road once, the straight line only in the portion overlapping the thick road should be deleted. , Or dividing a thin road at a position across a thick road into two parts (that is, drawing a straight line graphic by designating a start point and an end point in two times), it is necessary to perform either operation. It required a rather complicated drawing work.

An object of the present invention is to check, when a new graphic image of a road or the like is drawn at a desired position, whether or not there is an overlapping portion with a graphic image of another road or the like, and automatically determine the result. It is to be able to draw a graphic image that has been dynamically corrected.

[0007]

The means of the present invention are as follows. A first drawing means for drawing a first graphic image at an arbitrarily designated position; and a first drawing means for displaying the first graphic image drawn by the first drawing means on a display screen.
When the drawing control of the second graphic image at a desired arbitrary position is designated in the state where the first graphic image is displayed on the display screen,
Determining means for determining whether or not the drawing area of the second graphic image overlaps a part of the drawing area of the first graphic image, and the drawing area of the second graphic image is determined by the determining means. When it is determined that the second graphic image overlaps a part of the drawing area of the first graphic image, the second graphic image is prevented from being drawn in the overlapping area.
Second drawing means for drawing the graphic image of
Second display control means for displaying the second graphic image drawn by the drawing means on the display screen on which the first graphic image is displayed.

[0008]

The operation of the means of the present invention is as follows. When the drawing of the second graphic image at the desired arbitrary position is designated in the state where the first graphic image is displayed on the display screen, the drawing area of the second graphic image is the above-mentioned area. It is determined whether the drawing area of the first graphic image overlaps a part of the drawing area of the first graphic image, and it is determined that the drawing area of the second graphic image overlaps a part of the drawing area of the first graphic image. In this case, the second graphic image is drawn so that the second graphic image is not drawn in the overlapping area portion, and the drawn second graphic image is displayed as the first graphic image. The above-mentioned displayed screen is displayed.

Therefore, when an attempt is made to draw a new graphic image by designating a desired position, another graphic image overlapping the graphic image is automatically detected, and the new graphic image is detected in the overlapping area portion. The new graphic image will be immediately drawn without being drawn, and the graphic of the image that the new graphic image will be placed under the graphic image already drawn and displayed will be placed. Drawing can be performed easily, and when a plurality of graphic images are sequentially added and sequentially edited, extremely smooth graphic image drawing is possible.

[0010]

【Example】

(1) Configuration FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 1 is a drawing data creation device which is the gist of the present invention, and is parallel based on the start point / end point data and the width data input from an input unit such as a keyboard 8 and a pointing device 9. A drawing formula calculation function that calculates the line drawing formula, a determination function that determines whether or not the drawn parallel line and the newly set parallel line intersect, the start or end point of each intersection of the intersecting parallel lines Has a redrawing function for erasing each line in the parallel line area intersecting with each other, and its specific processing function is shown in the processing flow of FIG.

Reference numerals 2 to 4 denote memories that are read / write controlled by the drawing data creating apparatus 1, and of these, 2 is drawing data (start point / end point / end point / created by the drawing data creating apparatus 1 to be displayed. Display RAM for storing drawing formulas, etc., 3 is a stack RAM for storing drawing data that needs to be redrawn, and 4 is a start point / end point / width etc. input from an input unit such as the keyboard 8 and pointing device 9. It is a calculation RAM for storing the data of, the calculation result data, and the like.

A drawing device 5 draws (expands) a graphic on the video RAM 6 based on the drawing data stored in the display RAM 2 according to a drawing command from the drawing data creating device 1.

Reference numeral 6 denotes a video R in which graphic data to be displayed, which is generated by the drawing processing of the drawing device 5, is pattern-developed.
AM (V-RAM), 7 is a display device (CRT) for displaying graphics drawn on the video RAM 6.

Reference numerals 8 and 9 are input sections for inputting various data including a start point / end point / width, etc., 8 is a keyboard, and 9 is a pointing device (PD). FIGS. 2A to 2D are diagrams showing examples of display states associated with an input operation for explaining the operation in the above embodiment. Here, FIG. 10A is a display state of the line A drawn by the start point A1 and the end point A2, and FIG. 9B is a line B generated based on the data of the width H input to the line A.
(Starting point: B1, Ending point: B2) display state, Figure (c) is a display state of line C (Starting point: B1, Ending point: B2, Intersection point: xac, xbc) intersecting lines A, B, Figure (d) Is a line D generated based on the width K data input to the line C
(Start point: D1, end point: D2, intersection: xad, xbd) and the display state of the intersection drawn by the redrawing process of each line (parallel lines of A, B and C, D) are shown.

FIG. 3 is a flowchart showing a processing flow executed by the drawing data creating apparatus 1. Here, START1 indicates a processing start position by inputting a start point / end point, and START2 indicates a processing start position by inputting a width. (2) Action i). Drawing of Line A (See FIG. 2A) First, the keyboard 8 or the pointing device 9 is used to set a starting point A1 and an ending point A2 of a straight line (A) that is a basis for drawing one of the intersecting roads.

Upon receiving the coordinate data of the start point A1 and the end point A2, the drawing data creating apparatus 1 calculates a drawing formula corresponding to the same input data and calculates this drawing formula and the input data (A1, A2). Memory 4 for RAM (FIG. 3,
START1, step S2).

Then, the straight line (A) indicated by the input start point A1 and end point A2 is the line already input,
That is, the lines stored in the display RAM 2 (here, A
1 and A2 are the first setting data, so it is checked whether or not there is a corresponding line (step S3 in FIG. 3).

Here, if it is confirmed that the straight line (A) does not intersect with other lines that have already been set, the drawing data (start point / end point /
RAM for calculation after transferring the drawing formula) to the display RAM 2.
4 is cleared (steps S15 and S13 in FIG. 3).

When new drawing data is written in the display RAM 2, a drawing command is sent from the drawing data creating device 1 to the drawing device 5. When the drawing device 5 receives a drawing command from the drawing data creating device 1, the drawing data (start point / end point / drawing formula) newly set in the display RAM 2 is read out, and the line of the straight line (A) according to the data content is read. A minute image is generated and expanded on the video RAM 6. The linear line segment images developed on the video RAM 6 are sequentially sent to the display device 7 at a predetermined display timing, and the display screen of the display device 7 is displayed as shown in FIG.
A straight line (A) as shown in (a) is displayed (step S14 in FIG. 3).

Ii). Drawing of line B (see FIG. 2B) After the basic straight line (A) is drawn, the width (road width) H is set subsequently. When the drawing data creation device 1 receives the data of the width H, based on the data and the coordinate value of the straight line A, a straight line (B) having a width H parallel to the straight line A
The start point B1 and the end point B2 of the above are calculated, the drawing formula of the straight line is further calculated, and the drawing formula and calculation data (B1, B2)
Is stored in the calculation RAM 4 (FIG. 3, START2, steps S1 and S2).

The straight line (B) indicated by the calculated start point B1 and end point B2 is the line that has already been input,
That is, the lines stored in the display RAM 2 (here, A
1, it is checked whether or not it intersects with the straight line A2 whose end points are A2 (step S3 in FIG. 3).
However, if it is confirmed that it does not intersect with another line (A) that has already been set, after transferring the drawing data (start point / end point / drawing formula) stored in the calculation RAM 4 to the display RAM 2. , The calculation RAM 4 is cleared (steps S15 and S13 in FIG. 3).

When new drawing data is written in the display RAM 2, the drawing data creation device 1 sends a drawing command to the drawing device 5. When the drawing device 5 receives a drawing command from the drawing data creation device 1, the drawing data (start point / end point / drawing formula) newly set in the display RAM 2 is read out, and the line of the straight line (B) according to the data content is read. A minute image is generated and developed (overwritten) on the video RAM 6.

As a result, in addition to the already developed line segment image of the straight line (A), the line segment image of the straight line (B) parallel to the same line is developed on the video RAM 6. The linear line segment images developed on the video RAM 6 are sequentially sent to the display device 7 at a predetermined display timing, and the display screen of the display device 7 is displayed as shown in FIG.
Parallel straight lines (A, B) having a width H as shown in (b)
Is displayed (step S14 in FIG. 3).

Iii). Drawing of line C (see FIG. 2 (c)) Next, the starting point C1 of the straight line (C) that is the basis for drawing a road intersecting the road of width H defined by the parallel straight lines A and B
And C2.

Upon receiving the coordinate data of the start point C1 and the end point C2, the drawing data creating apparatus 1 calculates a drawing formula corresponding to the same input data and calculates this drawing formula and the input data (C1, C2). Memory 4 for RAM (FIG. 3,
START1, step S2).

Then, the straight line (C) indicated by the input start point C1 and end point C2 is the line already input,
That is, the lines stored in the display RAM 2 (here, A
It is checked whether or not a straight line A whose end points are 1, A2 and a straight line B whose end points are B1 and B2) are crossed (step S3 in FIG. 3).

Here, if it is confirmed that the straight line (C) intersects with another line which has already been set, the respective intersections (xac, xbc) are calculated, and the coordinate data of this intersection is calculated. It is held in the calculation RAM 4 (step S4 in FIG. 3).

Then, the drawing data (start point C1, end point C2, and intersection) stored in the calculation RAM 4 and
Of the drawing data stored in the display RMA2, all the lines (A, B) intersecting with the straight line (C) and the coordinate data of the intersections are sequentially stacked together with the drawing formula for each line segment. It is stacked on the RAM 3 (steps S4 to S6 in FIG. 3).

As a result, in the stack RAM 3, the lines (A, B, C) intersecting with each other and their intersections (xac, x) are crossed.
The coordinate data of bc) is sequentially stacked for each line segment as redrawing data including the drawing formula.

If the drawing data creating apparatus 1 stacks the redrawing data of all the intersecting line segments in the stack RAM 3 by the above processing, then the above calculation RMA is performed.
Drawing data stored in 4 (intersection points xac, xbc /
Based on (start point C1, end point C2 / drawing formula), line segment data that is bisected with the intersection point as an end point is created, and this redrawing data is transferred to the display RAM 2 (step S7 in FIG. 3).

Further, the drawing data creating apparatus 1 is provided with the above-mentioned R for display.
After writing new drawing data in AM2, it is judged whether or not the width (road width) is set (whether or not a line parallel to the straight line (C) is drawn), and if the width is not set. , And sends a drawing command to the drawing device 5 (step S8 in FIG. 3).

The drawing device 5 is the drawing data creating device 1 described above.
When the drawing command is received, the drawing data (start point / end point / drawing formula) newly set in the display RAM 2 is read out, and straight lines (C; C1 to xac and C2 to x according to the data content are read out.
A straight line dot image divided into bc is generated and developed (overwritten) on the video RAM 6. The straight line image developed on the video RAM 6 is sequentially sent to the display device 7 at a predetermined display timing, whereby the display screen of the display device 7 is divided into two straight lines (see FIG. 2C). C; C1-xac and C2-xbc)
Then, parallel straight lines (A, B) intersecting the same line are displayed (step S14 in FIG. 3).

Iv). Drawing line D (intersection) (Fig. 2 (d))
Reference) After setting the start point C1 and the end point C2 of the straight line (C), the width (road width) K is set along with the straight line.

The drawing data creating apparatus 1 determines the starting point D1 and the ending point D2 of a straight line (D) having a width K parallel to the straight line C based on the set width K and the coordinate values of the straight line C. Then, the drawing formula of the straight line is calculated, and the drawing formula and the calculation data (D1, D2) are stored in the calculation RAM 4 (FIG. 3, START2, steps S1, S2).

Then, the straight line (D) indicated by the calculated start point D1 and end point D2 is the already input line,
That is, the lines stored in the display RAM 2 (here, A,
(B, C) is checked (step S3 in FIG. 3).

Here, if it is confirmed that the straight line (D) intersects with another line that has already been set, the respective intersections (xad, xbd) are calculated, and the coordinate data of this intersection is calculated. It is held in the calculation RAM 4 (step S4 in FIG. 3).

Then, drawing data (intersection point (xad, xbd), start point D1,
The end point D2), all the lines (A, B) intersecting the straight line (D) among the drawing data stored in the display RAM 2, and the coordinate data of the intersections are drawn together with the drawing formula for each line segment. Sequentially in the stack RAM 3 (steps S4 to S6 in FIG. 3).

As a result, in the stack RAM 3, the lines (A, B, D) intersecting with each other and the intersections (xad, x) are crossed.
The coordinate data of bd) are sequentially stacked in line segment units together with the drawing formula.

When the drawing data creation apparatus 1 stacks the coordinate data of all the straight lines intersecting with each other and the intersections thereof in the stack RAM 3 by the above processing, the drawing data stored in the calculation RAM 4 ( Intersection x
Based on (ad, xbd / start point D1, end point D2 / drawing formula), line segment data that is bisected with the intersection as an end point is created, and this redrawing data is transferred to the display RAM 2 (step S7 in FIG. 3).

Further, the drawing data creating apparatus 1 is provided with the above-mentioned R for display.
After writing new drawing data in AM2, it is determined whether or not the width (road width) is set (whether or not a line parallel to the straight line (C) is drawn) (step S3 in FIG. 3).

Here, when the drawing data creation device 1 confirms that the width (K) is set, the stack R
After erasing each drawing data in the display RAM 2 corresponding to the drawing data stacked in the AM3, the stack RA
The drawing data for each line segment stacked in M3 is sequentially read, redrawing data is created from the drawing data including the intersections, and the created redrawing data is sequentially displayed RA.
Writing to M2 (steps S9 and S10 in FIG. 3).

If all the redrawing data for the drawing data stored in the stack RAM 3 is created and stored in the display RAM 2, the above stack RAM is created.
3 and the RAM 4 for calculation are cleared, and a drawing command is sent to the drawing device 5 (steps S11 to S13 in FIG. 3).

The drawing device 5 is the drawing data creating device 1 described above.
When the drawing command is received from the video RAM 6, the video RAM 6 is once cleared, the redraw data set in the display RAM 2 is sequentially read, a line segment image according to the data content is generated, and this is expanded on the video RAM 6. Go. The linear image developed on the video RAM 6 is sequentially sent to the display device 7 at a predetermined display timing, whereby the display screen of the display device 7 is divided into four halves as shown in FIG. Book straight line (A1-xad, x
ad-D1, B1-xbd, xbd-D2, C1-xa
c, xac to A2, C2 to xbc, xbc to B2) is displayed (step S1 in FIG. 3).
4).

By having the graphic processing function as described above, it is possible to draw intersections very quickly and easily, and it is possible to easily draw roads of uniform width with high accuracy, especially at diagonal intersections. In addition, you can easily add intersections and even roads with an arbitrary width on the already drawn road map,
Can be changed.

[0045]

According to the present invention, when an attempt is made to draw a new graphic image by designating a desired position, another graphic image overlapping the graphic image is automatically detected, and in the overlapping area portion, The new graphic image is immediately drawn without drawing the new graphic image, and the graphic image to be newly drawn is placed below the graphic image already drawn and displayed. You can easily draw the shape of an image like
When sequentially editing while adding a plurality of graphic images, extremely smooth graphic image drawing is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram showing an example of a display state for explaining the operation of the above embodiment.

FIG. 3 is a flowchart for explaining the operation of the above embodiment.

[Explanation of symbols]

1 ... Drawing data creation device, 5 ... Drawing device, 6 ... VRA
M, 7 ... CRT, 9 ... pointing device.

Claims (1)

[Claims] 1. A first drawing means for drawing a first graphic image at an arbitrarily designated position, and a first drawing means for displaying the first graphic image drawn by the first drawing means on a display screen. 1 display control means, and when the drawing of the second graphic image at a desired arbitrary position is designated in the state where the first graphic image is displayed on the display screen, the second graphic image is displayed. Discriminating means for discriminating whether or not the drawing area of the graphic image of the first graphic image overlaps a part of the drawing area of the first graphic image, and the drawing area of the second graphic image is determined by the discriminating means. When it is determined that the image overlaps with a part of the drawing area of the image, second drawing means for drawing the second graphic image so that the second graphic image is not drawn in the overlapping area, This second drawing hand In the drawn graphics-rendering apparatus characterized by comprising a second display control means for displaying the second graphic image displayed the display screen of the first graphic image, a.