JPH01266683A - Broken line generator - Google Patents

Abstract

PURPOSE:To slat either a curve or a straight line with an arbitrary broken line such as an alternate long and short dash line and an alternate long and two short dashes line and to plot an especially smooth broken-line curve by providing a broken line table part, a control part, a small straight-line segment dividing means, a straight-line segment generating means, etc. CONSTITUTION:A broken line table 106a is provided for a broken line table part 106, and a coordinate point sequence for one cycle is previously written to the table 106a for each of plural kinds of line types. Further, a control part 102 obtains the positions of two arbitrary points on one cycle of the broken line and coordinates corresponding to the positions based on the coordinate point sequence inputted from an input means 101 and outputs the obtained positions and coordinates to a small straight-line segment dividing means 103. Thus, the means 103 refers to information given from the control part 102 and the table 106a, divides the information into small straight-line segments, and outputs the small straight-line segments. Next, a straight-line segment generating means 104 inputs the small straight-line segments, generates a straight-lined segment between the coordinates indicated as a start point and an end point, and outputs a prescribed broken line to an output device 105. Thus, either the curve or the straight line can be plotted with the broken line such s the alternate long and short dash line and to alternatelong and two short dashes line, and the smooth broken-line curve can be plotted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to the field of data processing equipment. In particular, CA
Can be used for D device.

The present invention relates to a broken line generating device, and more particularly to a broken line generating device that generates broken lines such as a dashed-dot line and a dashed-two dotted line for straight lines or curves with small intervals between coordinate point sequences.

〔overview〕

The present invention provides a broken line generator that generates and outputs a broken line by inputting a coordinate point sequence and line type constituting a curve or a straight line. By dividing the line into two segments and sequentially outputting the divided minute straight line segments via predetermined straight line segments, it is possible to draw a curve or a straight line with any broken line, and in particular, it is possible to draw a smooth broken line curve. .

[Conventional technology]

Conventionally, this type of broken line generator has the following characteristics, as shown in FIG.
A broken line is always generated from the starting point between two coordinate points represented by the starting point and the ending point.

[Problem that the invention seeks to solve]

The conventional broken line generator mentioned above always generates a broken line such as a dashed line or a dashed double dot line from the starting point between two coordinate points, so the distance between the coordinate points is sufficiently long compared to one cycle of the broken line. There is a drawback that beautiful broken lines cannot be generated for coordinate point sequences that do not exist. Furthermore, when drawing a smooth curve, it is necessary to make the distance between the coordinate points sufficiently small, and there is a drawback that it is not possible to draw a smooth curve with a broken line such as a dash-dot line or a dash-double-dot line.

An object of the present invention is to provide a broken line generator that can draw curves or straight lines as arbitrary broken lines such as one-dot chain lines and two-dot chain lines, and in particular can draw smooth broken line curves, by eliminating the above-mentioned drawbacks. It is in.

[Means for solving problems]

The present invention provides an input means for inputting a sequence of coordinate points and a line type constituting a curve or a straight line, a broken line generating means for generating a predetermined broken line based on the inputted sequence of coordinate points and the line type, and In the broken line generating device, the broken line generating means includes a broken line table section that stores and outputs a broken line table in which coordinate point sequences of one cycle are written in advance for a plurality of types of line types. a control unit that calculates and outputs the positions of arbitrary two points on one cycle of the broken line and their corresponding coordinates based on the input coordinate point sequence; and information given from the control unit and the broken line table. a minute straight line segment dividing means for dividing and outputting the minute straight line segments with reference to the minute straight line segments, and a straight line segment generating means for inputting the minute straight line segments, generating straight line segments, and outputting a predetermined broken line to the output device. It is characterized by

[Effect]

The broken line table section stores in advance a plurality of types of broken line tables. The control unit □ determines the positions of two arbitrary points on the broken line-period and the corresponding coordinates for the inputted coordinate point sequence, and sequentially outputs them to the minute straight line segment dividing means. The minute straight line segment dividing means refers to the information inputted from the control section and the broken line table, divides the broken line into minute straight line segments, and sequentially outputs the divided line segments to the straight line segment generating means. The straight line segment generation means generates a predetermined straight line segment from the inputted minute straight line segment, and outputs it as a predetermined broken line to the output device.

Therefore, the generation of a minute straight line segment by the minute straight line segment dividing means and the generation of a straight line segment by the straight line segment generation means are arbitrarily generated depending on the input line type, and it is possible to draw an arbitrary broken line. Furthermore, by providing finer intervals between coordinate point sequences, it becomes possible to draw smooth curved broken lines.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

This embodiment includes an input means 101 for inputting a coordinate point sequence and line type constituting a curve or a straight line, and a broken line generation means for generating a predetermined broken line based on the inputted coordinate point sequence and the line type. , and an output device 105 such as a graphic display or an X-Y block for outputting the generated broken line, wherein the broken line generating means determines in advance the coordinate points of one period for a plurality of types of line types. Dashed line table 1 with columns written
06a, a control section 102 that calculates and outputs the positions of two arbitrary points on one period of the broken line and their corresponding coordinates based on the inputted coordinate point sequence; The minute straight line segment dividing hand 103 divides the minute straight line segments by referring to the information given from 102 and the dashed line table 106a, and inputs the minute straight line segments and creates a straight line between the coordinates represented by the start point and the end point. and a straight line segment generating means 104 for generating a predetermined broken line and outputting a predetermined broken line to an output device 105.

A feature of the present invention is that, in FIG. 1, a broken line table section 106 including a control section 102, a minute straight line segment dividing means 103, a straight line segment generating means 104, and a broken line table 106a is provided.

Next, the operation of this embodiment will be explained. First of all,
The broken line table 106a, the control unit 102, and the minute straight line segment dividing means 103 will be explained in more detail, and finally the overall operation will be explained.

First, the broken line table 106a will be explained.

FIG. 2 is an explanatory diagram showing an example of broken line data for creating the broken line table 106a. The length of one period of the dashed line is 24
Then, find the value one period above the broken line. For example -
If it is a dotted chain line, the value is 18.20.22.24.

(Hereinafter, this page margin) Table 1: Broken line table 106a Table 1 is an example of the broken line table 106a. Line types (1) are solid lines, (2) are short wave lines, (3) are half-bright lines,
(4) is a long wave line, (5) is a - dotted chain line, (6) is a very long line,
(7) shows a two-dot chain line and (8) shows an extremely short broken line. The contents and number of data are values obtained based on Figure 2. For example, the contents of the - dotted chain line in line type (5) are 18.20.22.2
4, and the number of data is the number of contents, which is 4.

Next, the control unit 102 will be explained. The control unit 102 determines the information to be passed to the minute straight line segment dividing unit 103 based on the coordinate point sequence inputted by the input unit 101, that is, the positions of two arbitrary points on one cycle of the broken line and their coordinates, and performs control.

A method for obtaining information to be passed to the minute straight line segment dividing means 103 will be explained using FIGS. 3(a) and 4).

FIGS. 3(a) and 3) are explanatory diagrams of division by the control unit,
and FIG. 4 is an explanatory diagram of information passed from the control section to the minute straight line segment dividing means.

In FIG. 3, two given coordinate points g. , go.

1 and the broken line of one cycle length AL,
As shown in Figure 3 (a), there are two coordinate points over several periods (pattern ■), and as shown in Figure 3, etc., there are two coordinate points within a - period (pattern ■). Pattern ■)
You could think so. T1, T. 1 and Tk are dashed lines - periods representing identification for each period, and the coordinate points at the beginning of each period are C1, C1゜l, and Ck. dl is the distance between the coordinate points C1 and gn, dh+1 is the distance between the coordinate points Ck and g h+1, and the distance is d. The initial value of is set to 0.

If the distance between coordinate point g7 and gh is H, then AL≦H
If 1l-drl holds true, it can be judged as pattern ■, and if AL>Hll-d, 1 holds true, pattern ■.

On the other hand, according to FIG. 4, the information to be passed to the minute straight line segment dividing means 103 is the broken line - the beginning of the period is 81, the end is El, the length of the period is AL, and the pointer P1 is expressed as the distance from S.
and P2, pointer PL, coordinates of P2 (X, PI
, y, 1) and (XP2, y, 2).

In pattern (2) in FIG. 3(a), first, line segment g regarding synchronization T1. ,g,. Coordinate point g on 1. distance A from
By finding the coordinate point C1+1 which is L-d, ,
The value of the pointer P1 in FIG. 4 is the value of the dns pointer P2, and the coordinate of the pointer P1 is g.

Let the coordinates of pointer P2 be the coordinates of C1+.

Next, regarding the period T+a++, find the coordinates of point C1+2 on line segment gtl,gn+1 at distance AL from coordinate point C1°, and change the value of pointer P1 in FIG. 4 to 01 pointer P2
The value of is AL, the coordinates of pointer P1 are the coordinates of Cas+, and the coordinates of pointer P2 are C. 2 coordinates. Similarly, the information shown in FIG. 4 can be obtained regarding the synchronization T, +2, , Tw. Regarding the synchronization TII, the coordinate points C8 and g,. 1
Find the distance d h+1, set the value of pointer P1 to 0, and set the value of pointer P2 to do in FIG. 1. Let the coordinates of pointer P1 be the coordinates of C8, and the coordinates of pointer P2 be the coordinates of gh+1.

In pattern ① of Fig. 3 et al., the coordinate points gh and gh
Find the sum d of the distance a+ and the distance d, and set the value of pointer P1 in Fig. 4 to dR, and the value of pointer P2 to d, , +l.
s The value of pointer P1 is g1%, the coordinates of pointer P2 is g
7°.

The information shown in FIG. 4 can be obtained for the coordinate points.

Explain using. FIG. 5 is an explanatory diagram showing the relationship between the shape of the broken line and the pointer. The minute straight line segment dividing means 103 refers to the information given from the control unit 102, that is, the positions of two arbitrary points on the broken line-period, their coordinates, and the broken line table 106a as shown in FIG. Divide into constituent minute straight lines.

To simplify the explanation, the contents of the broken line table 106a are the array WLT (1, 2, 3, 4, 5, 6), the number of data IT is 6, - the period length AL is 6, and - an arbitrary number on the period. The relationship between the shape of the broken line and the pointer is shown in FIG. 5, assuming the positions of the two points, that is, the pointers P1 and P2 (where P 1 <P 2). Broken line shape and two pointers P
1 and P2 have five patterns. Pattern ■ is a case where two pointers P1 and P2 are included across several line segments within the broken line, and pattern ■ is a case where two pointers P1 and P2 are included within one line segment within the broken line.
2 is included, pattern ■ is a case where pointers P1 and P2 are not included in both line segments within the broken line, and pattern ■ is a case where pointer P2 is included in one line segment within the broken line. Pattern (2) is a case where the pointer P1 is in one line segment within the broken line.

By finding the minimum value N1 such that the array WLT(Nl)≧P1 and the minimum value N2 such that the array WLT(N2)≧P2 is satisfied, and comparing N1 and N2, patterns ① to ② can be determined.

Table 2 is a table in which N1 and N2 are determined and compared based on the example shown in FIG.

If N2>N1+1, pattern ■, N1=N2 and N1
If is an odd number, pattern ■, if N1 = N2 and N1 is even, pattern ■, if N2 = N1 + 1 and N1 is even, pattern ■, if N2 = N1 + 1, N1 Table 2 If the pattern comparison is odd, pattern ■ .

Next, a minute straight line segment to be passed to the straight line segment generating means 104 is determined. The coordinates corresponding to pointers P1 and P2 are respectively (
X p IS'l p + ) and (Xp2,yPl
), then in the case of pattern ■, it is obvious that pointer P1
and the coordinates corresponding to P2 (XP1% 3'Pl), (
x, 2, y, 2) are minute straight line segments. In the case of pattern (2), it is clearly a part where no straight line segment is generated. In the case of pattern ■, line segments (X41, y, 2), (XP2, y,
2) Find the point (x, y) which is the coordinate point above and the distance WLT(N 1) - P 1 from the coordinate point (XPl, yPl), and calculate the line segment (x, y), (X, 2, y
, 2) becomes a minute straight line segment. In the case of pattern ■, the line segment (
x, 1, yl, ), (x, 2, y, 2), and the distance WLT (Nl
)-PL, find the point (x, y), and calculate the line segment (Xp+s yPl), (
X, y) becomes a minute straight line segment. In the case of pattern ■, Pl
, WLT (Nl), WLT (Nl) , WLT (
N 1 + 1) between 11, WLT (N2-2),
Between WLT (N2-1), WLT (N2-1), P2
By applying each pattern ■～■ in between,
Minute straight line segments can be found.

Next, an example of the overall operation will be explained using FIG. 6 and FIG. 1. In FIG. 6, 201 is the input means 101
This is an example of a coordinate point sequence input by , and 202 is the line type input by the input means 101, that is, a dashed-dotted line.

The input coordinate point sequence 201 is plotted by the control unit 102 as a dashed line -
The positions of two arbitrary points on the period and their corresponding coordinates are determined and sequentially passed to the minute straight line segment dividing means 103. The minute straight line segment dividing means 103 refers to the information given by the control unit 102 and the broken line table 106a representing one period of the broken line, and divides the broken line into minute straight line segments. The divided minute straight line segments are sequentially passed to the straight line segment generation means 104 and output to the output device 105. Reference numeral 203 shows an example of an output broken line curve of an 11-dot chain line outputted by the broken line generator of this embodiment.

[Effects of the Invention] As explained above, the present invention inputs a coordinate point sequence and line type constituting a curve or a straight line, and divides the coordinate point sequence into minute straight line segments based on a broken line table representing -periodic broken lines. divide,
By outputting to the output device by the straight line segment generation means,
A curve or a straight line can be drawn using a dashed line such as a dashed-dotted line or a dashed-double-dotted line, and a smoother dashed curve can be drawn by narrowing the intervals between the coordinate point sequences.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is an explanatory diagram showing the broken line data of the broken line table. FIGS. 3(a) and 3(a) are explanatory diagrams of division by the control unit. FIG. 4 is an explanatory diagram of information passed from the control section to the minute straight line segment dividing means. FIG. 5 is an explanatory diagram showing the relationship between the shape of the broken line and the pointer. FIG. 6 is an explanatory diagram showing an example of its operation. FIG. 7 is an explanatory diagram of broken lines according to a conventional example. 101... Input means, 102... Control unit, 103.
. . . minute straight line segment dividing means, 104 . . . straight line segment generation means, 105 . . . output device, 106 . Input line type, 203...Output broken line curve.

Claims (1)

[Claims] 1. Input means (101) for inputting a coordinate point sequence and line type constituting a curve or straight line, and generating a predetermined broken line based on the inputted coordinate point sequence and line type. a broken line generating means, and an output device (
105), wherein the broken line generating means includes: a broken line table section (106) that stores and outputs a broken line table (106a) in which coordinate point sequences of one cycle of a plurality of line types are written in advance; , a control unit (102) that calculates and outputs the positions of two arbitrary points on one period of the broken line and their corresponding coordinates based on the input coordinate point sequence;
a minute straight line segment dividing means (103) for dividing and outputting minute straight line segments by referring to information given from the control unit and the broken line table; A broken line generating device characterized by comprising a straight line segment generating means (104) for outputting to the device.