JPS6043532B2 - Chain line interpolation method for XY plotter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chain line interpolation method for recording a chain line pattern between a given start point and end point in an XY plotter.

It has an arithmetic control unit consisting of a microprocessor, etc., and a linear interpolator that sends data for linearly driving the recording device of the XY recorder based on the output data of this arithmetic control unit, and has a There is an XY plotter that can interpolate and record in a chain line pattern of a predetermined length.

In this type of conventional XY plotter, in the case of a continuous recording section where the end point of the first recording section becomes the starting point of the next recording section, if the first recording section is exactly an integral multiple of the chain line pattern length, the pattern The next recording section can be recorded continuously without changing the length, but if the first recording section is not an integral multiple of the chain line pattern length, the last chain line pattern will be interrupted and will be discontinuous with the chain line pattern of the next recording section. However, there was a drawback that beautiful chain lines were not recorded. As a method to solve this problem, for example, a chain line interpolation method can be considered in which the pattern length is determined so that an integer multiple of the chain line pattern length exactly matches the distance of the recording section, and recording is performed using that pattern length. In this case, the pattern length changes for each designated recording section, resulting in irregular chain lines that look unnatural.

SUMMARY OF THE INVENTION An object of the present invention is to solve these drawbacks, and to provide a chain line interpolation method that can record continuous beautiful chain lines with a constant pattern length regardless of the recording section length.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of the main parts of an XY plotter for implementing the method of the present invention. In FIG. 1, 10 is an arithmetic control unit;
20 is a linear interpolator, and 30 is an XY recorder. The arithmetic control section 10 has arithmetic, storage, and control functions, and is preferably a microprocessor.

The arithmetic and control section 10 is given coordinate data of the starting point and ending point of the recording section. Then, based on this data, data necessary for recording a chain line of a predetermined pattern length is calculated and sequentially sent to the linear interpolator 20. The linear interpolator 20 generates X-axis and Y-axis signals for performing linear recording according to this data. Note that the linear interpolator 20 does not necessarily have to be configured separately from the calculation control unit 10, and may be configured integrally with the calculation control unit 10, or the calculation control unit 10 may have an equivalent function. It can also be omitted. The XY recorder 30 is a conventionally known XY recorder having a recording device that moves in the X-axis and Y-axis directions according to the x-axis and Y-axis signals,
The up/down of the recording implement is controlled by the up/down signal of the recording implement from the arithmetic control section 10.

The operation of the present invention in such a configuration will be explained next.

To simplify the explanation, three points, namely A(Xl, yl), B(X2, y2), C(X3, y
An example of a case where chain line interpolation is performed using a straight line between 3) will be explained. First, it is assumed that the length of the solid line part of the determined chain line pattern is 11 and the length of the blank part is 12. Now, A
The distance LAB from the point to the point B is, and in this case, let the X component of the solid line portion 11 be Dxl, and the y component be Dyl.

The calculation control unit 10 calculates these moving distances and provides the calculated data to the linear interpolator 20. Linear interpolator 20 generates X-axis and Y-axis signals based on this data. At this time, the pen down signal is also given to the XY recorder 30, thereby recording the first solid line portion 11. Similarly, for the blank area 12, its X component DOl and y components D and l are calculated by the following equation. Based on this data, the recording device of the XY recorder 30 is moved by the first blank portion 12 by the signal from the linear interpolator 20 and the pen up signal.

The second and subsequent chain lines are also recorded by the same operation as described above.

As the chain line interpolation progresses in this way, only when the chain line recording finally comes close to point B, and if the chain line pattern is recorded one more time, it will exceed point B.
Perform the following corrections. That is, first, the chain line recording is advanced to point B (a blank space may be included). The length of the chain line beyond point B (unwritten amount of the chain line pattern) is memorized, and then the section LBO from point B to point C is recorded as a chain line in the same way as above, but the remaining length of the previous time is After recording the indentation, correction is made so that a predetermined chain line pattern is sequentially recorded. In this way, a smooth and beautiful chain line record can be obtained by continuously linearly interpolating the bent portion without changing the length of the chain line pattern.

When the bending point falls on a blank space, the bending point can also be indicated by plotting dots as shown in FIG.

The above explained the case of interpolation using a straight line, but two points A
Next, a case where chain line interpolation is performed between B using circular arcs will be described.

In an XY plotter, a circular arc is nothing but a subdivision of linear interpolation, and a set of linear interpolations between two short points becomes a circular arc. Therefore, by using the linear interpolation method described above, the arc can be drawn as a smooth chain line. Note that the type of chain line is not limited to that in the embodiment, and other various chain lines such as a dashed-dotted line may also be used.

As explained above, according to the present invention, a smooth and beautiful chain line without discontinuity is performed by linear interpolation including a predetermined line type of the chain line so that the recording section becomes a locus of a specified functional relationship. 7 can be recorded.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of an XY plotter for carrying out the method of the present invention, FIG. 2 is a diagram for explaining the invention in detail, and FIG. 3 is a diagram showing an example of chain line recording. . 10... Arithmetic control unit, 20... Linear interpolator, 30...
...XY recorder.

Claims (1)

[Scope of Claims] 1. Includes an arithmetic control section that performs predetermined arithmetic operations based on input data, and a linear interpolator that sends data for linearly driving a recording device of an XY recorder based on the data of this arithmetic control section. , an XY plotter that can interpolate and record a chain line pattern of a predetermined length between a given starting point and ending point.
When the end point of the first recording section becomes the starting point of the next recording section, correction is made so that the last chain line pattern in the first recording section is extended to the next recording section without interruption. The feature is the chain line interpolation method of the XY plotter. 2. A chain line interpolation method for an XY plotter according to claim 1, characterized in that when a bending point of a recording section corresponds to a blank part of a chain line pattern, the bending point is drawn by dot recording.