JPH0486960A - Device for suiting both endpoints of broken line - Google Patents

Abstract

PURPOSE:To link a real line part to both endpoints, which are the starting point and ending point of a broken line element, without fail by calculating and outputting drawing information from the length data of a fundamental element and the full length data of the broken line element so as to link the real line part to the starting point and the ending point and to stretch the length of the real line part. CONSTITUTION:A suiting arithmetic means 4 executes the suiting arithmetic of the drawing data at the starting point and ending point of the broken line and outputs the data as the drawing information according to the calculated full length of the broken line element, fundamental element and curve information read from a fundamental element storing means 3. For the suiting, the real line part to be linked to the starting point or the ending point is stretched so that the real line part can be linked to the starting point and the ending point without fail. The stretch processing can achieve the purpose even when only one of the points is linked and in order to improve balance, however, it is desirable to process the both points. A broken line group drawing information storing means 5 successively stores and preserves the suited drawing data as the set of the drawing information of the respective broken line elements. An output means 6 reads the drawing data from the means 5 and outputs the data to a drawing means (not shown in the figure).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drawing system for drawing straight lines and curves using broken lines using CAD data, and particularly to a device for optimizing both end points of broken lines that makes both end points of broken line elements clear. Regarding.

[Conventional technology]

Conventionally, when drawing broken line elements in a CAD system or the like, the basic elements of the broken line are repeatedly drawn in order from the start point to the end point of the broken line. The basic element of this broken line is, for example, represented by Lp as shown in FIG. This is realized by the combination of

That is, the basic elements are repeatedly drawn in order until the required length of the broken line element is reached, and at the end point, the drawing of the broken line element is finished even if it is in the middle of the basic element.

Note that even when the broken line element is a curve, this basic element is used to draw the broken line curve according to the curve information included in the broken line element information.

[Invention or problem to be solved]

In the conventional drawing mentioned above, the end point of the broken line element is often reached at the empty line part of the broken line basic element. In this case, as shown in FIGS. 7 and 9, no line is inevitably drawn at the end point of the broken line. As shown in Figure 5 (A) and (B), this means that the length of the dashed line element falls within the range of the following formula in relation to the length Lp of the basic element, that is, the range indicated by O in the figure. The disadvantage is that if there is an end point, the end point is unclear.

(When the broken line element is a straight line) L p x n - L 2 < L≦LpXn+ΔL However, Lp=L1+L2, Ll is the solid line part, LP is the blank line part,
LP indicates the basic element, and L indicates the length of the broken line element.

(When the dashed line element is a curved line) indicates a blank line portion, LP indicates a basic element, L indicates the length of the broken line element, and C indicates a curved line.

SUMMARY OF THE INVENTION In order to eliminate such conventional drawbacks, it is an object of the present invention to provide an apparatus for optimizing both end points of a broken line by optimizing the drawing of both end points of a broken line element and making the start and end points of the broken line clear. It is in.

[Means to solve the problem]

According to the present invention, an apparatus for optimizing both end points of a broken line in a CAD system receives at least broken line element information including start point and end point information indicating both end points of the broken line, and adjusts the broken line element according to the start point and end point information. total length calculation means for calculating total length data; basic element storage means for storing in advance data of each part of the basic element consisting of the solid line portion of the broken line and the blank line portion; and basic element storage means read from the basic element storage means. Optimization of determining and outputting drawing information in which a solid line part is connected to a start point and an end point, and the length of at least one of the solid line parts connected to the start point or the end point is expanded or contracted from the length data of the element and the total length data of the broken line element. It is configured to include calculation means.

Further, in a device for optimizing both end points of a broken line in a CAD system, the broken line element information including start point and end point information indicating both end points of the broken line and curve information possessed by the broken line are received at least, and the start point, end point information and curve information are received. Accordingly, a total length calculation means for calculating the total length data of the broken line element, a basic element storage means that stores in advance data of each part of the basic element consisting of the solid line part and the blank line part of the broken line, and the basic element storage means The solid line portion is connected to the start point and the end point, and the length of at least one of the solid line portions connected to the start point or the end point is expanded or contracted based on the length data of the basic element read from, the total length data of the broken line element, and the curve information. and an optimization calculation means for obtaining and outputting the drawn drawing information.

Furthermore, the optimization calculation means calculates and outputs drawing information in which the length of the solid line portion connected to the starting point and the length of the solid line portion connected to the end point are expanded or contracted to be substantially the same.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flow chart explaining the present invention in detail.

The input means 1 is operated to input dashed line element information such as start point information, end point information, and if the dashed line is a curve, curve information indicating, for example, what kind of curve the curve is and its size. input (step 101). The total length calculation means 2 calculates the total length of the broken line based on the input start point and end point information and the basic element of the broken line read from the basic element storage means 3. Note that if there is no curve information, it is assumed to be a straight line, and if there is, the total length of the curve is determined according to the curve information (step 102). The basic element storage means 3 stores in advance one of the required basic elements indicated by the broken line or a plurality of data having different contents. In the following explanation, basic elements - - will be used for easy understanding.

The optimization calculation means 4 performs optimization calculations on the drawing data at the start and end points of the broken line according to the obtained total length of the broken line element, the basic element read from the basic element storage means 3, and the curve information, and outputs it as drawing information. (Step 103
). To optimize it, the solid line portion connected to the start point or end point is expanded or contracted so that the solid line portion is always connected to the start point or end point. Note that although the purpose can be achieved even if only one of the expansion and contraction processes is performed, it is desirable to perform the expansion/contraction process on both sides in order to improve the balance. The details will be described later. The broken line group drawing information storage means 5 stores the optimized drawing data,
It is sequentially stored and saved as a collection of drawing information for each broken line element (steps 1 to 4). The output means 6 reads the drawing data from the broken line group drawing information storage means 5 and outputs it to the drawing means (not shown) (step 105).

Next, the optimization calculation means 4 will be explained in detail using FIGS. 3(A) and 3(B). First, the explanation will be given from FIG.

The curve discriminator 41 determines whether the input broken line information includes curve information (Step 201); if there is no curve information, it is treated as a straight line, and the straight line optimization unit 42 determines the length of the broken line element. Based on the length t and p of the basic element, select the coefficient n from positive integers satisfying [2-1] (Step 202), L/Lp≦n<L/LP+1--C Expression-
1] Next, based on the calculated coefficient n, if the length L of the broken line element matches [Formula-2] (step 203), [Formula-3
] to find the optimization amount Lm (step 204), and if it does not match [C formula-2] but matches [formula-4] (step 2
03, 204), calculate the optimization amount Lm by [Formula-5] (Step 206). If it does not match [Formula 4] in Step 205, it means that there is no need for optimization, and the optimization amount Lm is calculated by normal processing. All you have to do is output the drawing data.

L p X n−L 2 < L≦L p X n−−
--・-(Formula-2) LL-(LpXn-L) L m = (L
p X nL)・・・・・・・・・－・・・・・・・・・
−・・・・・・・・・・・・・[−3) LpX (n −
1) <L≦LpX(n-1)+ΔL...[Formula-4] However,
ΔL-LIXa, O<a<1.

・・・・・・・・・・・・・・・ [Formula-5] At this time,
If the length of the dashed line element matches [Formula-2], the end point of the dashed line element is in the empty line part and the end point part is unclear,
If the length of the dashed line element matches [Formula-4], it means that the length of the solid line part at the start point of the dashed line element is different from the length of the solid line part at the end point, and the shape is a little difficult to see. .

By correcting the length of the solid line part connected to the starting point of the broken line element using the optimization 31 L m obtained in this way,
As a result, the entire broken line element is moved, and optimization is achieved. This modification changes the length of the solid line connected to the starting point (
LL-Lm), step 207), leave the length of the empty line part as L2, and then f*L1. ．． L2. LL, L2...
The basic elements are repeated until the end point as in ..., and when the end point is reached, the data of the optimized broken line element is obtained (step 208).At this time, the length of the solid line part connected to the end point is the length of the solid line part at the start point. The result is the same length.

Note that if neither [Formula-2] or [Formula-4] match, optimization may be unnecessary, or at least [Formula-2]
If they do not match, it is desirable to carry out optimization using [Formula-5] in order to maintain balance.

Next, if there is curve information in the curve discrimination section 41 (step 201>, each step 209 to 209 shown in FIG. 3(B)
If each process in step 215 is executed by the curve optimization calculation unit 43, the objective can be achieved in the same way as in the case of a straight line. In addition,〔
Equations-6] to [Equations-10] are as shown in FIG. 6, and the marks indicate curves.

In the above example, optimization was done by shortening the length of the solid line that connects to the starting point, but the length of the solid line of the basic element closest to the end point is increased by the optimization amount obtained using a predetermined calculation formula. You can also connect the solid line part to the start point and end point in the same way.

The key is to connect the solid line portions to the start point and the end point, and preferably to expand or contract the lengths of the solid line portions connected to the start point and the end point so that they are approximately the same for good balance.

FIGS. 7 to 10 are diagrams illustrating examples in which broken line elements input in a different manner are optimized based on basic elements.

For each country, the length of the basic element L p is 20, and the length of the solid line part L
When l is 14 and the length L2 of the blank line part is 6, the case where the length L of the broken line element is 78 and the same is 81 is shown. The coefficients n obtained for each at step 202 [Equation-1] in FIG. 3 are all 4. Based on this, the optimization amount Lm is determined through step 203 or 205. If the length of the dashed line element is 78, [Formula-3] [Formula-8]
The corrected amount Lm obtained by is 8.

If the length of the dashed line element is 81, [Formula-5] [Formula-10
] The optimization amount Lm found in [ ] is 6.5.

50 in each figure is a straight line and a curved broken line, which are assumed to be continuous lines formed by basic elements. 60°61.62.6
3 is an example of drawing by the conventional method, and 70.71 and 72.73 are examples of drawing optimized by the present invention, and it can be seen that the drawings are well-balanced.

〔Effect of the invention〕

According to the present invention, since the solid line portion always connects to both end points, which are the starting point and the ending point, of the broken line element, there is an effect that the starting point and the ending point become very clear. Further, according to the embodiment, the lengths of the solid line portions connecting the starting point and the ending point are almost the same, resulting in well-balanced drawing, which has a great effect.

FIG. 7 is a diagram showing an example of an arithmetic expression applied to the case.

FIG. 8, FIG. 9, and FIG. 10 are diagrams showing specific drawing examples of broken line elements.

DESCRIPTION OF SYMBOLS 1... Input means, 2... Full length calculation means, 3... Basic element storage means, 4... Optimization calculation means, 5... Broken line group drawing information storage means, 6... Output means , 41...
Curve discrimination unit, 42... Straight line optimization calculation unit, 43...
Curve optimization calculation section.

Claims (1)

[Scope of Claims] 1. A device for optimizing both end points of a broken line in a CAD system, which receives at least broken line element information including start point and end point information indicating both end points of the broken line, and adjusts the broken line according to the start point and end point information. total length calculation means for calculating the total length data of the element; basic element storage means for storing in advance data of each part of the basic element consisting of the solid line portion of the broken line and the blank line portion; From the length data of the basic element and the total length data of the broken line element, the solid line part is connected to the start point and the end point, and the drawing information in which the length of at least one of the solid line parts connected to the start point or the end point is expanded or contracted is determined and output. What is claimed is: 1. A device for optimizing both end points of a broken line, comprising: optimizing calculation means; 2. A device for optimizing both end points of a broken line in a CAD system receives at least broken line element information consisting of start point and end point information indicating both end points of the broken line and curve information possessed by the broken line, and calculates the start point, end point information, and curve information. According to
total length calculation means for calculating total length data of the broken line element;
A basic element storage means in which data of each part of the basic element consisting of the solid line part and the empty line part of the broken line is stored in advance, and the length data of the basic element read from the basic element storage means, and the data of the broken line element and optimization calculation means for determining and outputting drawing information in which a solid line portion is connected to a start point and an end point, and at least one length of the solid line portion connected to the start point or the end point is expanded or contracted from the total length data and the curve information. A device for optimizing both end points of a broken line. 3. Both ends according to claim 1 or 2, characterized in that the optimization calculation means calculates and outputs drawing information in which the length of the solid line portion connected to the starting point and the length of the solid line portion connected to the end point are expanded or contracted to be substantially the same. Point optimization device.