JP2003076995A - Thick line/thick broken line plotting method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To plot a thick line and a thick broken line in a natural shape in a small circuit scale and in a short processing time regarding a thick line/thick broken line plotting method used in the case of plotting the thick line and the thick broken line on a plotting surface of an image plotter or a frame buffer. SOLUTION: Following plotting of a first straight line or a straight broken line, second and succeeding straight lines or straight broken lines are successively adjacently plotted. In this case, a perpendicular line PE for which a start point P1 of the first straight line L1 is the base of the perpendicular line is calculated, the perpendicular line PE and coordinates of the start point of an n-th (n is an integer of >=1) straight line are used and the start points of (n+1)-th and succeeding straight lines or straight broken lines are calculated so as to perpendicularly plot end parts of the thick lines or the end parts of respective line segments of the thick broken lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight line having a width of 2 pixels or more (hereinafter referred to as a thick line) and a broken line of a straight line having a width of 2 pixels or more (hereinafter referred to as a thick line) on a drawing surface of an image drawing device or a frame buffer. The present invention relates to a thick line / thick line broken line drawing method and apparatus used when drawing a broken line).

[0002]

2. Description of the Related Art Conventionally, as a method for drawing a thick line, for example, as shown in FIGS. 20A and 20B, regardless of the inclination of the thick line, the ends of the thick line are arranged vertically or horizontally on the drawing surface. A method of drawing is known.

As a method of drawing a thick broken line, there is known a method of drawing so that each line segment forming the thick broken line is vertical or horizontal on the drawing surface, as shown in FIGS. 20C and 20D. There is.

[0004]

In such a conventional thick line / thick line broken line drawing method, it is possible to draw a thick line or a thick broken line only by moving a straight line or a straight broken line of one pixel width in the vertical or horizontal direction. Therefore, there is an advantage that the processing time is short, but there is a problem that the shape of the thick line or the thick broken line becomes an unnatural shape.

Further, in particular, as a method of drawing a thick line having an inclination of 45 °, a straight line having a one-pixel width having an inclination of 45 ° is moved in a direction perpendicular to the straight line to obtain an inclination of 45 °.
There is a method of drawing a thick line with a value of 0. According to this thick line drawing method, a thick line having a right angle end can be drawn in a short processing time, but as shown in FIG. 21, it is not drawn within the thick line. There is a problem that pixels are generated. Even when drawing a thick broken line with an inclination of 45 °,
When drawing in the same manner, there is a problem that some pixels are not drawn in each line segment.

Therefore, a method of combining basic figures such as triangles and squares can be considered as a method of making the cross section of the end of the thick line or the broken line of the thick line a natural shape.
This causes a problem that the amount of calculation is significantly increased and a great amount of processing time is required.

In view of the above point, the present invention provides a thick line / thick line dashed line drawing method and apparatus capable of performing drawing of a naturally shaped thick line and thick line broken line with a small circuit scale and a short processing time. With the goal.

[0008]

The method of drawing a thick line / thick line broken line according to the present invention is to draw a thick line by drawing a straight line or a straight line broken line first and a second straight line or a straight line broken line next to each other. Or it is a thick line / thick line dashed line drawing method that draws a thick broken line, and calculates the start point of the second or subsequent straight line or straight broken line so that the end of the thick line or the end of each line segment of the thick broken line is drawn at a right angle. It has a process to do.

According to the thick line / thick line broken line drawing method of the present invention, only the change processing of the starting point of the second straight line or straight line or broken line is performed to make the end of the thick line or the end of each line segment of the thick broken line into a right angle. Can be drawn.

The thick line / thick line broken line drawing apparatus of the present invention draws a thick line or a thick line broken line by drawing the first straight line or the straight line broken line and subsequently drawing the second straight line or straight lines or straight line broken lines in order. A thick line / thick line broken line drawing device, which is provided with means for calculating the starting point of the second straight line or straight lines or straight line broken lines so that the end of the thick line or the end of each line segment of the thick broken line is drawn at a right angle. That is.

According to the thick line / thick line broken line drawing apparatus of the present invention, only by changing the starting point of the second straight line or straight line or straight line broken line, the end of the thick line or the end of each line segment of the thick broken line is made into a right angle. Can be drawn.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
The first and second embodiments of the thick line / thick line broken line drawing method of the present invention and one embodiment of the thick line / thick line broken line drawing apparatus of the present invention will be described.

(First method of drawing thick line / thick line broken line of the present invention
(Embodiment) FIGS. 1 to 13 are diagrams for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention. The first embodiment of the thick line / thick line broken line drawing method of the present invention is A thick line or a bold broken line of the Y main axis is drawn on the drawing surface having the X and Y coordinates as positive integers. A thick line or a bold broken line of the Y main axis means Δ when the inclination is ΔX / ΔY.
It means one that satisfies X / ΔY ≦ 1.

In the first embodiment of the thick line / thick line broken line drawing method of the present invention, when drawing a thick line, it is premised that the coordinates and width of the start point and end point of the first straight line for drawing the thick line are given. For example, as shown in FIG. 1, a first straight line L1 is used, and the starting point is P1 (X1, Y
1) When a straight line whose end point is Q1 (X2, Y2) is designated, first, the slope of the first straight line L1 with respect to the Y axis dx = (X2-X1) / (Y2-Y1) To calculate.

Then, linear linear interpolation is performed from the starting point P1, the ending point Q1 and the slope dx of the first straight line L1, and as shown in FIG. 2, a drawing point D1 for drawing the first straight line L1.
1, D12, D13, ... Are obtained and these are drawn. Further, an imaginary perpendicular PE that is perpendicular to the first straight line L1 having the starting point P1 of the first straight line L1 as the leg of the perpendicular is obtained.

FIG. 3 shows the starting points P2, P3, ... Of the second and subsequent straight lines L2, L3, ... Necessary for drawing the designated thick line.
It is a flowchart showing a procedure for obtaining, in this example, first, (X1, Y1), (dx, 1, 0) are stored (step S1).

Next, VX = X1 + 1, VY = Y1-dx
(Step S2, FIG. 4), and further, the integer part of the Y coordinate is
Let int (Y) represent int (VY) and int (Y1-
1) is compared (step S3).

Then, int (VY) <int (Y1-1)
If so, the coordinates of the starting point P2 of the second straight line L2 are (X1 +
1, Y1), and X1 = X1 + 1, Y1 = Y1, VX =
VX + 1 and VY = VY-dx are set (step S4).

On the other hand, int (VY) ≧ int (Y1
−1), the coordinates of the starting point P2 of the second straight line L2 is (X1 + 1−dx, Y1-1), and X1 = X1 + 1−
dx, Y1 = Y1-1, VX = VX, VY = VY are set (step S5).

In the case of this example, as shown in FIG.
Since (VY) <int (Y1-1), the coordinates of the starting point P2 of the second straight line L2 are (X1 + 1, Y1), and the starting point P2 (X1 + 1, Y1) of the second straight line L2, the slope dx
And linear linear interpolation from the length, and as shown in FIG.
Drawing points D21 and D2 for drawing the second straight line L2
2, D23, ... Are obtained and these are drawn. In addition, FIG.
, X1 = X1 + 1, Y1 = Y1, VX = V
X + 1 and VY = VY-dx are set (step S4).

Next, similarly, int (VY) and int (Y
1-1) is compared (step S3), int (VY)
<Int (Y1-1), the start point P of the third straight line L3
The coordinate of 3 is (X1 + 1, Y1), and X1 = X1 + 1,
Y1 = Y1, VX = VX + 1, and VY = VY-dx are set (step S4).

On the other hand, int (VY) ≧ int (Y1
−1), the coordinates of the starting point P3 of the third straight line L3 is (X1 + 1−dx, Y1-1), and X1 = X1 + 1−
dx, Y1 = Y1-1, VX = VX, VY = VY are set (step S5).

In the case of this example, as shown in FIG.
Since (VY) <int (Y1-1), the coordinates of the starting point P3 of the third straight line L3 is set to (X1 + 1, Y1), and the starting point P3 (X1 + 1, Y1) of the third straight line L3, the slope dx
And linear linear interpolation from the length, and as shown in FIG.
Drawing points D31 and D3 for drawing the third straight line L3
2, D33, ... Are obtained and these are drawn. Also, FIG.
, X1 = X1 + 1, Y1 = Y1, VX = V
X + 1 and VY = VY-dx are set (step S4).

Next, similarly, int (VY) and int (Y
1-1) is compared (step S3), int (VY)
<Int (Y1-1), the start point P of the fourth straight line L4
The coordinates of 4 are (X1 + 1, Y1), and X1 = X1 + 1,
Y1 = Y1, VX = VX + 1, and VY = VY-dx are set (step S4).

On the other hand, int (VY) ≧ int (Y1
−1), the coordinates of the start point P4 of the fourth straight line L4 is (X1 + 1−dx, Y1-1), and X1 = X1 + 1−
dx, Y1 = Y1-1, VX = VX, VY = VY are set (step S5).

In the case of this example, as shown in FIG.
Since (VY) ≧ int (Y1-1), the coordinates of the starting point P4 of the fourth straight line L4 is (X1 + 1-dx, Y1-1).
And the start point P4 (X1 + 1-dx, of the fourth straight line L4,
Y1-1), the slope dx and the length are subjected to linear linear interpolation to obtain drawing points D41, D42, D43, D44, ... For drawing the fourth straight line L4, as shown in FIG. draw. Also, X1 = X1 + 1-dx,
Y1 = Y1-1, VX = VX, and VY = VY are set (step S5). After that, by repeating the same operation,
Draw a thick line.

That is, in the first embodiment of the thick line / thick line broken line drawing method of the present invention, when a thick line is drawn, n
When the starting point of the straight line L _n is (X _n , Y _n ), the drawing of the _n-th straight line L _n is completed, and when the starting point of the _{n + 1-th} straight line L _{n + 1} is determined, the n + 1-th straight line L _n is determined. _{n + 1} of the start point of the candidate, as shown in FIG. 10, the two points of coordinates (X _{n +} 1, Y _n) and coordinates _{(X n + 1 -dx, Y} n-1).

Therefore, the X coordinate of the perpendicular PE is X._{n + 1}in the case of
Let the Y coordinate of VY be VY, and int (VY) and int (Y_n-1) With
For example, as shown in FIG. 11, int (V
Y) <int (Y_n-1), The n + 1th straight line L_{n + 1}of
Start with (X_{n + 1}, Y_n), And as shown in FIG. 12, int
(VY) ≧ int (Y_n-1), The n + 1th straight line L
_{n + 1}The start point of (X_{n + 1}-Dx, Y_n-1)
It

As a result, as shown in FIG. 13A, it is possible to draw the thick line of the Y main axis so that its ends are at right angles (end sides are oriented in the width direction). In the case of drawing a thick broken line of the Y main axis, as in the case of drawing a thick line of the Y main axis, a drawing point for drawing the thick line of the Y main axis is obtained, and from this drawing point, the end of the thick line of the Y main axis is drawn. By removing the drawing point to make a broken line with the same inclination as the side,
As shown in FIG. 3B, it is possible to draw the thick broken line of the Y main axis so that the ends of the respective line segments are at right angles (the cross section faces the width direction).

As described above, according to the first embodiment of the thick line / thick line broken line drawing method of the present invention, when a thick line or a thick line broken line of the Y main axis is drawn, a process of changing the starting point of the second straight line or straight line or straight line broken line is performed. You can draw the end of the thick line or the end of each line of the thick broken line at a right angle only by performing the drawing. Therefore, it is possible to draw the thick line or the thick broken line of the Y spindle of a natural shape with a small circuit scale and a short processing time. It can be carried out.

(Second line of thick line / thick line broken line drawing method of the present invention
(Embodiment) FIGS. 14 to 17 are views for explaining the second embodiment of the thick line / thick line broken line drawing method of the present invention, and the second embodiment of the thick line / thick line broken line drawing method of the present invention is the pixel X , The Y coordinate is a positive integer, and a thick line or a bold broken line of the X main axis is drawn on the drawing surface. A thick line or a bold broken line of the X main axis means Δ when the inclination is ΔY / ΔX.
It means one that satisfies Y / ΔX ≦ 1 or less. Therefore,
In the case of ΔY / ΔX = 1, it is also a thick line or a thick broken line of the X main axis, or a thick line or a thick broken line of the Y main axis.

Also in the second embodiment of the thick line / thick line broken line drawing method of the present invention, as in the first embodiment, when a thick line is drawn, the start point of the first straight line for drawing the thick line,
Assuming that the coordinates and width of the end point are given,
For example, as shown in FIG. 14, as the first straight line L1, the start point is P1 (X1, Y1) and the end point is Q1 (X2, Y).
When the straight line defined as 2) is specified, first, the slope of the first straight line L1 with respect to the X axis is dy = (Y2-Y1).
/ (X2-X1) is calculated.

Next, as shown in FIG. 15, a drawing point D for drawing the first straight line L1 by performing linear linear interpolation from the start point P1, the end point Q1 and the slope dy of the first straight line L1.
11, D12, D13, ... Are obtained and these are drawn.
Further, a perpendicular line PE that is perpendicular to the first straight line L1 having the starting point P1 of the first straight line L1 as the starting point is obtained.

FIG. 16 shows the starting points P2, P3, of the second and subsequent straight lines L2, L3, ... Required for drawing the designated thick line.
It is a flowchart which shows the procedure which calculates | requires ..., and is what replaced X and Y of the flowchart shown in FIG. That is, in the second embodiment of the thick line / thick broken line drawing method of the present invention, first, (X1, Y1) and (dy1, 0) are stored (step T1).

The starting points P2, P3 of the second and subsequent straight lines L2, L3, ... According to the flowchart shown in FIG.
.. is determined and is drawn by the same method as in the first embodiment of the thick line drawing method of the present invention, so that the thick line of the X main axis is drawn so that its ends are at right angles, as shown in FIG. 17A. be able to.

When a thick broken line of the X main axis is drawn, a drawing point for drawing the thick line of the X main axis is obtained, and the drawing point of the X main axis is drawn from this drawing point as in the case of drawing the thick line of the X main axis. By removing the drawing points for making a broken line with the same inclination as the end of the thick line, as shown in FIG. 17B, the thick broken line of the Y spindle is drawn so that the end of each line segment becomes a right angle. be able to.

As described above, according to the second embodiment of the thick line / thick line broken line drawing method of the present invention, when a thick line or a thick line broken line of the X-spindle is drawn, a process for changing the starting point of the second straight line or straight line or straight line broken line is performed. You can draw the end of the thick line or the end of each line of the broken line at a right angle by simply performing the drawing. Therefore, you can draw the thick line or the broken line of the X-spindle in a natural shape with a small circuit scale and a short processing time. It can be carried out.

(Embodiment of thick line / thick line broken line drawing apparatus of the present invention) FIG. 18 is a block circuit diagram showing a main part of one embodiment of thick line / thick line broken line drawing apparatus of the present invention. This is to enable implementation of the first and second embodiments of the method of drawing a thick broken line.

In one embodiment of the thick line / thick line broken line drawing apparatus of the present invention, when the thick line is drawn, the thick line drawing information is given. However, as shown in FIG.
The coordinates (XA, Y
A), the coordinates (XB, YB) of the center point QB of the end side 12 on the end point side of the thick line 10, and the width W of the thick line 10 are given. Even when a thick broken line is drawn, thick broken line drawing information similar to the thick line drawing information is given.

In FIG. 18, 13 is a frame buffer in which a thick line or a bold broken line is drawn, and 14 is a frame buffer 13.
Pixel drawing means for drawing a thick line or a thick broken line on
Reference numeral 5 is an inclination calculating means for calculating the inclination of the thick line or the thick broken line from the coordinates (XA, YA) and the coordinates (XB, YB) included in the given thick line drawing information or the thick broken line drawing information, and 16 is the coordinate (XA, YA). From the coordinates (XB, YB), the coordinates (X1, Y1) of the start point P1 of the first straight line L1 and the end point Q1
It is a coordinate calculation means for calculating the coordinates (X2, Y2).

Reference numeral 17 is a width direction control means for controlling drawing in the width direction based on the width (W) information of a thick line or a thick broken line, and 18 is coordinates (XA, YA) and coordinates (XB, Y) of the thick line or the thick broken line.
It is a length direction control means for controlling the drawing in the length direction from the length information of the thick line or the thick broken line obtained from B).

Reference numeral 19 is a starting point storage means for storing the starting point coordinates of a straight line used for drawing, and 20 is a virtual perpendicular line perpendicular to the first straight line with the starting point of the first straight line as the foot of the perpendicular line. Perpendicular line calculating means, 21 is a starting point calculating means for calculating the starting point of a straight line using the starting point coordinates stored in the starting point storing means 19 and the perpendicular line calculated by the perpendicular line calculating means 20, and 22 is calculated by the starting point calculating means 21. It is a linear linear interpolating means for obtaining a drawing point (pixel address in the frame buffer 13) by inputting the starting point and performing linear linear interpolation under the control of the length direction control means 18.

Reference numerals 23 to 25 are used to draw a bold broken line, 23 is a broken line pattern memory for storing a broken line pattern using a register, and 24 is a drawing point output by the linear linear interpolation means 22 is a straight line. It is a pattern linear interpolation means for acquiring from the length direction control means 18 what position the drawing point is located above.

A line linear interpolation unit 22 receives the position information of the drawing point output from the pattern linear interpolation unit 24.
Determines whether or not to draw the drawing point to be output, by referring to the broken line pattern stored in the broken line pattern memory 23, and when drawing should not be performed, the pixel drawing means 14 is controlled not to output the drawing point. Pattern reference means.

In one embodiment of the thick line / thick broken line drawing apparatus of the present invention, when a thick line is drawn, as the thick line drawing information, for example, as shown in FIG. The coordinates (XA, YA) of the point PA and the coordinates (XB, XB, of the center point QB of the end side 12 on the end point side of the thick line 10).
YB) and the width W of the thick line 10 is given.

Then, the inclination calculating means 15 causes the coordinates (XA,
The inclination of the thick line 10 is calculated from (YA) and the coordinates (XB, YB), and this is calculated as the perpendicular line calculation means 20 and the linear linear interpolation means 22.
Give to. Further, the coordinate calculation means 16 uses the coordinates (XA, Y
The coordinates (X1, Y1) of the starting point P1 and the coordinates (X2, Y2) of the ending point Q1 of the first straight line L1 for drawing the thick line 10 from A) and the coordinates (XB, YB) are calculated, and the starting point is stored. It is given to the means 19 and the perpendicular calculation means 20.

Next, the starting point calculating means 21 is the starting point storing means 1
9 stores the coordinates of the starting point P1 of the first straight line L1 (X
1, Y1) to the linear linear interpolation means 22, and the linear linear interpolation means 22 performs linear linear interpolation under the control of the length direction control means 18 to draw points D11 and D1 of the first straight line L1.
2, D13, ... Are obtained, and the pixel drawing means 14 draws these in the frame buffer 13 (see FIG. 2).

Next, the perpendicular line calculating means 20 determines the first straight line L.
A virtual perpendicular PE that is perpendicular to the first straight line L1 having the starting point of 1 as the foot of the perpendicular is calculated (see FIG. 2), and this is given to the starting point calculating means 21, and the starting point calculating means 21 causes the starting point storing means 19 to operate.
Using the coordinates (X1, X1) of the starting point P1 of the first straight line L1 and the perpendicular PE calculated by the perpendicular calculating means 20, the coordinates of the starting point P2 of the second straight line L2 stored in ( (See FIG. 4).

Next, the starting point storing means 19 updates the stored contents to the coordinates of the starting point P2 of the second straight line L2 calculated by the starting point calculating means 21, and the linear linear interpolating means 20 updates the starting point calculating means 2
The coordinates of the starting point P2 of the second straight line L2 calculated by 1 are input, linear linear interpolation is performed under the control of the length direction control means 18, and drawing points D21, D22, D2 of the second straight line L2 are performed.
3, the pixel drawing means 14 draws these in the frame buffer 13 (see FIG. 5).

Next, the starting point calculation means 21 is the starting point storage means 1
Using the coordinates of the starting point P2 of the second straight line L2 stored in 9 and the perpendicular PE calculated by the perpendicular calculating means 20, the coordinates of the starting point P3 of the third straight line L3 are calculated (see FIG. 6). .

Next, the starting point storage means 19 updates the stored contents to the coordinates of the starting point P3 of the third straight line L3 calculated by the starting point calculation means 21, and the linear linear interpolation means 22 updates the starting point calculation means 2.
The coordinates of the starting point P3 of the third straight line L3 calculated by 1 are input and linear linear interpolation is performed under the control of the length direction control means 18, and the drawing points D31, D32, D3 of the third straight line L3 are performed.
3, the pixel drawing means 14 draws these in the frame buffer 13 (see FIG. 7).

Next, the starting point calculating means 21 is the starting point storing means 1
The start point P4 of the fourth straight line L4 is calculated using the coordinates of the start point P3 of the third straight line L3 stored in 9 and the perpendicular PE calculated by the perpendicular calculating means 20 (see FIG. 8).

Next, the starting point storage means 19 updates the stored contents to the coordinates of the starting point P4 of the fourth straight line L4 calculated by the starting point calculation means 21, and the linear linear interpolation means 22 updates the starting point calculation means 2
The coordinates of the starting point P4 of the fourth straight line L4 calculated by 1 are input, and linear linear interpolation is performed under the control of the length direction control means 18 to draw points D41, D42, D4 of the fourth straight line L4.
3, the pixel drawing means 14 draws these in the frame buffer 13 (see FIG. 9). Thereafter, the same operation is repeated to draw a thick line (see FIG. 13A).

When drawing a thick broken line in the frame buffer 13, the pattern linear interpolation means 24 determines the drawing position of the drawing point output by the linear linear interpolation means 22 on the straight line. The pattern linear interpolation means 24
Input the position information of the drawing point output from the linear linear interpolation means 22 to determine whether or not to draw the drawing point output by the linear linear interpolation means 22 with reference to the broken line pattern stored in the broken line pattern memory 23, and not draw. In this case, the pixel drawing means 14 is controlled not to output the drawing point, and the thick broken line is drawn (see FIG. 13B).

As described above, according to the embodiment of the thick line / thick line broken line drawing apparatus of the present invention, when the thick line or the thick line broken line is drawn, only the second straight line or the starting point of the straight line broken line is changed. Since the end of the thick line or the end of each line segment of the thick broken line can be drawn at a right angle, it is possible to draw the natural thick line or the thick broken line with a small circuit scale and a short processing time.

[0056]

As described above, according to the present invention, it is possible to make the ends of thick lines or the ends of line segments of thick broken lines into right angles only by changing the starting points of the second straight line and straight broken lines. Since it can be drawn, it is possible to draw a thick line or a thick broken line having a natural shape with a small circuit scale and a short processing time.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 2 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 3 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 4 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 5 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 6 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 7 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 8 is a diagram for explaining a first embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 9 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 10 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 11 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 12 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 13 is a diagram for explaining the first embodiment of the thick line / thick line broken line drawing method of the present invention.

FIG. 14 is a diagram for explaining a second embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 15 is a diagram for explaining a second embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 16 is a diagram for explaining a second embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 17 is a diagram for explaining a second embodiment of a thick line / thick line broken line drawing method of the present invention.

FIG. 18 is a block circuit diagram showing a main part of an embodiment of a thick line / thick line broken line drawing apparatus of the present invention.

FIG. 19 is a diagram for explaining an embodiment of a thick line / thick line broken line drawing apparatus of the present invention.

FIG. 20 is a diagram for explaining a problem that a conventional thick line / thick broken line drawing method has.

FIG. 21 is a diagram for explaining a problem that a conventional thick line / thick line broken line drawing method has.

[Explanation of symbols]

10 ... Thick line 11, 12 ... Edges of thick line 13 ... Frame buffer 14 ... Pixel drawing means 15 ... Inclination calculation means 16 ... Coordinate calculation means 17 ... Width direction control means 18 ... Length direction control means 19 ... Starting point storage means 20 ... Perpendicular calculation means 21 ... Starting point calculation means 22 ... Linear linear interpolation means 23 ... Broken line pattern memory 24 ... Pattern linear interpolation means 25. Pattern reference means

Claims (3)

[Claims] 1. A thick line / thick line broken line drawing method for drawing a thick line or a thick broken line by drawing a first straight line or a straight broken line and subsequently drawing a second straight line or a straight broken line in order. , A thick line / thick line broken line having a step of calculating the starting point of the second straight line or straight lines or straight line broken lines so that the end of the thick line or the end of each line segment of the thick broken line is drawn at a right angle How to draw. 2. A thick line / thick line broken line drawing apparatus which draws a thick line or a thick broken line by drawing a second straight line or a straight broken line successively in order after drawing a first straight line or a straight broken line. , A means for calculating a starting point of a second straight line or straight line or straight line broken line so that the end of the thick line or the end of each line segment of the thick broken line is drawn at a right angle. Thick line dashed line drawing device. 3. The means for calculating the straight line of the first straight line or the straight line of the straight broken line with the starting point of the first straight line or the straight broken line as the leg of the perpendicular line, and the n-th line (where n is 1 or more). 3. The thick line according to claim 2, further comprising means for calculating the start point of the (n + 1) th straight line or straight broken line by using the start point of the straight line or straight broken line of
Thick line dashed line drawing device.