JPH0731737B2 - Graphic drawing device - Google Patents

Description

The present invention relates to a graphic drawing device capable of drawing and displaying a plurality of graphic images.

[Prior 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 created, a straight line graphic is first designated, and this straight line graphic image is displayed. The graphic image of the desired map was displayed by drawing one by one.

[Problems to be Solved by the Invention] Further, when sequentially drawing a graphic image of a road having a certain road width, there is a case where the road already drawn and the road overlap each other. For example, there is a case where the vehicle intersects as a crossroads, and it is necessary to rewrite it at the intersection to a graphic image of the crossroads.

In the past, in order to rewrite it, it has been necessary to correct each intersection of the graphic image of the road to be newly drawn and the graphic image of the road already drawn. For this correction, in the case of a road graphic image that has already been drawn, it is necessary to first erase the graphic image itself and then redraw the graphic image so that it becomes a crossroad at the intersection, which is quite complicated. Drawing work was necessary.

An object of the present invention is to, when drawing a new graphic image of a road or the like at a desired position, check whether or not there is an overlap (for example, an intersection portion) with a graphic image of another road or the like, and depending on the result. This is to make it possible to easily perform graphic drawing automatically corrected.

[Means for Solving the Problems] Means of the present invention are as follows.

First drawing means for drawing the first graphic image at an arbitrarily designated position, and the first drawing means drawn by the first drawing means.
Of the second graphic image at a desired arbitrary position in the state where the first graphic image is displayed on the display screen. When the drawing is designated, the determining means determines whether the drawing area of the second graphic image overlaps a part of the drawing area of the first graphic image, and the determining means determines the second area. When it is determined that the drawing area of the graphic image does not overlap a part of the drawing area of the first graphic image, the second area is set at the desired arbitrary position.
Is drawn as it is, and when it is determined that the drawing area of the second graphic image overlaps a part of the drawing area of the first graphic image, The overlapping area portion of each of the first and second graphic images is corrected so that the overlapping area portion is connected to the second graphic image, and the first and second graphic images are drawn. The second drawing means and the second graphic image drawn without correction by the second drawing means, or the first and second graphic images drawn with correction, are displayed on the display screen. Second display control means for displaying.

[Operation] The operation of the means of the present invention is as follows.

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 determining means determines that the drawing area of the second graphic image is It is determined whether or not it overlaps with a part of the drawing area of the first graphic image, and the determination means determines the second
When it is determined that the drawing area of the graphic image of FIG. 3 does not overlap a part of the drawing area of the first graphic image, the second graphic image is drawn as it is at the desired arbitrary position, and When it is determined that the drawing area of the second graphic image overlaps a part of the drawing area of the first graphic image, the area where the graphic image of the pair 1 and the second graphic image overlap each other. The first and second graphic images are drawn by correcting the overlapping area portion of each of the first and second graphic images so as to be connected by the portions. Then, the second graphic image drawn without correction or the first and second graphic images drawn with correction are displayed on the upper display screen.

Therefore, when you try to draw a new graphic image by designating a desired position, another graphic image that overlaps with that graphic image is automatically detected, and the graphic image and the overlapping area part are connected to each other. , Both graphic images can be automatically and immediately drawn on the graphic image in which only the corresponding partial areas are corrected, and it is extremely smooth when sequentially editing while adding multiple graphic images. It is possible to draw various graphic images.

[Example] (1). Structure FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a drawing data creating apparatus which is the gist of the present invention, and is based on start point / end point data and 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 drawing formula of the parallel lines, a determination function that determines whether the drawn parallel lines and the newly set parallel lines intersect, a starting point at each intersection of the intersecting parallel lines, or It has a redraw function that erases each line in the parallel line area that intersects as the end point,
The 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 creation device 1, and of these, 2 is drawing data created by the drawing data creation device 1 to be displayed (start point / end point / drawing formula, etc.). ) For display RA
M, 3 is a stack RAM that stores drawing data that needs to be redrawn, 4 is data such as the start point / end point / width input from the input unit such as the keyboard 8 and pointing device 9, and the data of the calculation result Is a calculation RAM that stores

Reference numeral 5 is a video RA based on the drawing data stored in the display RAM 2 in response to a drawing command from the drawing data creation device 1.
It is a drawing device that draws (expands) graphics on M6.

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

Reference numerals 8 and 9 are input sections for inputting various data including start point / end point / width, etc., 8 is a keyboard,
Reference numeral 9 is a pointing device (PD).

FIGS. 2 (a) to 2 (d) are views showing the display state associated with the input operation for explaining the operation in the above embodiment. Here, (a) is a display state of the line A drawn by the start point A1 and the end point A2, and (b) is a line B generated based on the data of the width H input to the line A (start point ; B
1, the end point; B2), the display state of the line C (start point; B1, the end point; B2, the intersection point; xac, xbc) intersecting the lines A and B in the figure (c), and the line C in the figure (d). The line D (start point; D1, end point; D2, intersection point; xad, xbd) generated based on the data of the width K input for the above and each line (parallel lines of A, B and C, D) The display states of the intersections drawn by the drawing process are shown.

FIG. 3 is a flow chart showing a processing flow executed by the drawing data creating apparatus 1. Where START1
Indicates the processing start position by inputting the start point / end point, and START2 indicates the processing start position by inputting the width.

(2). Action i). Drawing of Line A (See FIG. 2A) First, the keyboard 8 or the pointing device 9 is used to set the starting point A1 and the ending point A2 of the straight line (A) which is the 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 creation device 1 calculates a drawing formula corresponding to the same input data, and stores the drawing formula and the input data (A1, A2) in the arithmetic RAM 4. It is stored (FIG. 3, START1, step S2).

Then, the straight line (A) indicated by the input start point A1 and end point A2 is the line that has already been input, that is, the line stored in the display RAM 2 (here, A1 and A2 are the first setting data). Since it exists, it is checked whether or not it intersects with the corresponding line (step S3 in FIG. 3).

If it is determined that the straight line (A) does not intersect with another line that has already been set, the drawing data (start point / end point / drawing formula) stored in the calculation RAM 4 is displayed. RA
After transferring to M2, 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 creating device 1, the drawing data (start point / end point / drawing formula) newly set in the display RAM 2 is read out, and a line of a straight line (A) according to the data content is read out. Generate a minute image and video this RA
Deploy on M6. The straight line segment images developed on the video RAM 6 are sequentially sent to the display device 7 at a predetermined display timing, whereby a straight line image as shown in FIG. (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, the start point B1 and the end point B2 of the straight line (B) having the width H parallel to the straight line A are calculated, and the drawing formula of the straight line is calculated. The drawing formula and the calculation data (B1, B2) are stored in the arithmetic RAM 4 (3rd
(Figure, START2, steps S1, S2).

The line (B) indicated by the calculated start point B1 and end point B2 has already been input, that is, the line stored in the display RAM 2 (here, the straight line A having A1 and A2 as end points).
Check whether or not it intersects with (step S in FIG. 3).
3).

Here, the straight line (B) is the other line (A) already set.
If it is confirmed that it does not intersect with the above calculation RAM4
After transferring the drawing data (start point / end point / drawing formula) stored in 1 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 creating device 1, the drawing data (start point / end point / drawing formula) newly set in the display RAM 2 is read, and the line of the straight line (B) according to the data content is read. Generate a minute image and video this RA
Develop (overwrite) on M6.

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, whereby the width of the display screen of the display device 7 as shown in FIG. Parallel straight lines with H (AB)
Is displayed (step S14 in FIG. 3).

iii). Drawing of line C (see FIG. 2 (c)) Next, a starting point C1 and an ending point C2 of a straight line (C), which is a basis for drawing a road intersecting with a road having a width H by the parallel straight lines A and B, are drawn. Set.

Upon receiving the coordinate data of the start point C1 and the end point C2, the drawing data creation device 1 calculates a drawing formula corresponding to the same input data, and stores the drawing formula and the input data (C1, C2) in the arithmetic RAM 4. It is stored (FIG. 3, START1, step S2).

Then, the straight line (C) indicated by the input start point C1 and end point C2 is the line that has already been input, that is, the line stored in the display RAM 2 (the straight line A whose end points are A1 and A2).
Then, it is checked whether or not it intersects with the straight line B) whose end points are B1 and B2 (step S3 in FIG. 3).

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

Then, all the drawing data (start point C1, end point C2, and intersection) stored in the calculation RAM 4 and all of the drawing data stored in the display RAM 2 intersecting the straight line (C). Each coordinate data of the line (A, B) and its intersection is sequentially stacked together with the drawing formula for each line segment in the stack RAM 3 (steps S4 to S6 in FIG. 3).

As a result, the coordinate data of the lines (A, B, C) intersecting with each other and their intersections (xac, xbc) are sequentially stacked in the stack RAM 3 in units of line segments as redrawing data including the drawing formula.

When the drawing data creation device 1 stacks the redrawing data of each of the intersecting line segments in the stack RAM3 by the above processing, the drawing data stored in the arithmetic RAM4 (intersection points xac, xbc / start point) next. / C1, end point C2 / drawing formula), line segment data that is bisected with the intersection as the end point is created, and this redrawing data is transferred to the display RAM 2 (step S7 in FIG. 3).

Further, the drawing data creation apparatus 1 writes new drawing data in the display RAM 2 and then determines whether or not the width (road width) is set (whether to draw a line parallel to the straight line (C)). If it is determined that the width is not set, a drawing command is sent to the drawing device 5 (step S8 in FIG. 3).

Upon receiving a drawing command from the drawing data creation device 1, the drawing device 5 reads the drawing data (start point / end point / drawing formula) newly set in the display RAM 2, and draws a straight line (C; C1 ~ A dot image of a straight line divided into xac and C2 to xbc) is generated and developed (overwritten) on the video RAM6. The linear image developed on the video RAM 6 is sequentially sent to the display device 7 at a predetermined display timing, whereby the second image is displayed on the display screen of the display device 7.
The bisected straight line (C; C1-xac and C2
~ Xbc) and parallel straight lines (A, B) intersecting the same line are displayed (step S14 in FIG. 3).

iv). Drawing of line D (intersection) (see FIG. 2 (d)) 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 creation device 1 uses the set width K and the coordinate values of the straight line C to set the width K parallel to the straight line C.
The starting point D1 and the ending point D2 of the straight line (D) are calculated, and the drawing formula of the straight line is calculated, and the drawing formula and the calculation data (D1, D2)
Is stored in the calculation RAM 4 (FIG. 3, START2, step S1,
S2).

Then, does the straight line (D) indicated by the calculated start point D1 and end point D2 intersect the already input line, that is, the line (here, A, B, C) stored in the display RAM 2? It is checked whether or not (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, xb
d) is calculated, and the coordinate data of this intersection is held in the calculation RAM 4 (step S4 in FIG. 3).

The drawing data (intersection points (xad, xbd), start point D1, end point D2) stored in the calculation RAM 4 and the display RA
Of the drawing data stored in M2, all the lines (A, B) intersecting the straight line (D) and the coordinate data of the intersections are sequentially drawn together with the drawing formula for each line segment in the stack RAM3.
Stack (steps S4 to S6 in Fig. 3).

As a result, the coordinate data of the lines (A, B, D) intersecting with each other and the intersections (xad, xbd) of the lines intersecting each other are sequentially stacked in the stack RAM 3 in units of line segments.

The drawing data creation device 1 stacks the coordinate data of all the straight lines intersecting with each other and the intersections thereof by the above processing.
After stacking in RAM3, the line segment data obtained by dividing the intersection point as the end point based on the drawing data (intersection point xad, xbd / start point D1, end point D2 / drawing formula) stored in the calculation RAM4. Is created and this redrawing data is transferred to the display RAM 2 (step S7 in FIG. 3).

Further, the drawing data creation apparatus 1 writes new drawing data in the display RAM 2 and then sets a width (road width) or not (whether to draw a line parallel to the straight line (C)). Is determined (step S8 in FIG. 3).

Here, when the drawing data creation device 1 confirms that the width (K) is set, after deleting each drawing data in the display RAM 2 corresponding to the drawing data stacked in the stack RAM 3, The drawing data for each line segment stacked in the stack RAM3 is sequentially read, redrawing data is created from the drawing data including the intersections, and the created redrawing data is sequentially written to the display RAM2 ( (3) Steps S9 and S10).

Then, if all redrawing data for the drawing data stored in the stack RAM3 is created and stored in the display RAM2, the stack RAM3 and the calculation RAM4 are cleared and a drawing command is sent to the drawing device 5. Yes (Fig. 3 step
S11 ~ S13).

When the drawing device 5 receives the drawing command from the drawing data creation device 1, the drawing RAM 5 clears the video RAM 6 once, and then the display RAM 2
The redrawing data set in step S1 is read out sequentially, a line segment image is generated according to the data content, and this is expanded on the video RAM6. The linear image developed on the video RAM 6 is sequentially displayed on the display device 7 at a predetermined display timing.
As a result, on the display screen of the display device 7, as shown in FIG. 2 (d), the four straight lines (A1 to xad, xad to D1, B1 to xbd, xbd to D2) are bisected. , C1 ~ xac, xac ~ A
2, C2 to xbc, xbc to B2) are displayed as intersections (step S14 in FIG. 3).

By having the graphic processing function as described above, it is possible to draw an intersection very quickly and easily, and it is possible to easily draw a road with a uniform width with high accuracy, especially at an oblique intersection. Further, it is possible to easily add and change an intersection, a road having an arbitrary road width, or the like on the already drawn road map.

EFFECTS OF THE INVENTION According to the present invention, when a new graphic image is drawn by designating a desired position, another graphic image overlapping the graphic image is automatically detected, and the graphic image and the graphic image Both graphic images can be automatically and immediately drawn on the graphic image in which only the corresponding partial areas are corrected so that they are connected at the overlapping area. In such cases, it is possible to draw an extremely smooth graphic image.

Also, when trying to draw a new graphic image by designating a desired position, if there is no graphic image that overlaps the new graphic image, that is automatically determined, and the new graphic image is selected as the desired graphic image. It is also possible to draw as it is at the position to be drawn, and the operator does not need to consider whether or not the graphic image to be newly drawn overlaps with the graphic image already drawn and displayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 (a) to 2 (d) are diagrams showing an example of a display state accompanying an input operation for explaining the operation of the above embodiment, respectively. The drawing is a flow chart showing the processing flow of the drawing data creation apparatus in the above embodiment. 1 ... Drawing data creation device, 2 ... Display RAM, 3 ...
Stack RAM, 4 ... Calculation RAM, 5 ... Drawing device, 6 ...
… Video RAM (V-RAM), 7… Display (CPT), 8
...... Keyboard 8, 9 ...... Pointing device (P
D).

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. And the second graphic image drawing at the desired arbitrary position in the state where the first graphic image is displayed on the display screen. Determination means for determining whether or not the drawing area of the 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 drawing area does not overlap a part of the drawing area, the second graphic image is drawn as it is at the desired arbitrary position, and the drawing area of the second graphic image is the first drawing area. Drawing area The time of the overlap a part is determined, and the first
Of the first and second graphic images are corrected by correcting the overlapped area of each of the first and second graphic images so that the graphic image of FIG. Second to draw the figure image of
Second drawing means for drawing a graphic image of the second image, and the second drawing means drawn without correction by the second drawing means.
Second graphic image, or the first and second graphic images drawn after being corrected and displayed on the display screen.
And a display control means of the above.