JPH0547049B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a line interpolation method in an X-Y recorder, and more specifically, it is possible to record many types of lines with different densities using a dot printer. The present invention relates to a line interpolation method in an X-Y recorder.

[Technical background of the invention]

Conventionally, with regard to line interpolation methods in which various types of lines are recorded using an X-Y recorder using a dot printer to enable identification of one's own and others, the thickness of the lines has been changed because the interpolation process is relatively simple. A method of recording data in multiple stages is often used.

11A and 11B show a conventional example in which line interpolation is performed using a dot printer. Of these, Fig. 11A shows a basic line 10 formed by continuously recording one dot.
FIG. 11B shows a thick line 11 that is three times as thick as the basic line 10 by having a line width of three dots. In the conventional method, the thickness of the line is changed in several stages and recorded in this manner, thereby making it possible to discriminate the type of each line.

[Problem that the invention seeks to solve]

By the way, the conventional method described above, which interpolates lines in such a way that they can be distinguished by changing the thickness of each line in multiple stages, is difficult to use because the difference in the thickness of each line is clear. Using this as a clue, the type of line can be easily determined. However, when using such a conventional method, as the number of lines that need to be recorded increases, the width of each line must be made thicker in stages to distinguish between them. For this reason,
It has been pointed out that each line obtained after line interpolation has a problem in that the line width becomes thicker than necessary, resulting in a line that is difficult to see.

Therefore, when performing line interpolation using the conventional method and trying to avoid the above disadvantages, there is a restriction that the number of lines must be reduced and recorded, which makes it difficult to meet the diverse needs of users. There was a problem that could not be fully addressed.

[Purpose of the invention]

This invention was made in view of the above-mentioned problems seen in the conventional method, and its purpose is to identify each recorded line without using only the difference in the thickness of the line itself as a discrimination index. An object of the present invention is to provide a line interpolation method for an X-Y recorder that enables identification by using the difference in the thickness of the line itself and the difference in the shade of the line as the discrimination index.

[Means for solving problems]

In order to achieve the above object, the present invention was constructed as follows.

That is, the present invention is provided with arithmetic control means for performing predetermined arithmetic operations based on the coordinate values of two given points, and a line is drawn between the two points using a dot printer based on the data of the arithmetic control means. A line interpolation method in an X-Y recorder that performs interpolation, which includes a specification process for setting the thickness and density of the line to be interpolated;
It consists of a line interpolation process that is executed according to these designation processes, and among these, the designation process is:
The line interpolation process is performed by making it possible to specify a thickness that is an integral multiple of one dot, and by setting the density using variable processing according to the required line density. The position of the interpolation line is set according to the line thickness specified by the above specification process, and then, the longitudinal direction and inclination direction of the line to be interpolated are used as determining factors, and line interpolation is repeated according to each case. After performing the patterning process in the operation, the address and bit position of the starting point in the memory are specified, and depending on whether the Y coordinate value of the starting point in this case is an even number or an odd number, the address and bit position set in the specifying process are determined. After setting rewriting data using variable data according to the density of the line, and rewriting the byte data in which the specified address is located in the memory according to the rewriting data, for line interpolation. Its structural feature is that it moves in a movement direction determined by a predetermined processing routine and repeats the same process until it reaches the end point.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows an example of a main part configuration diagram of an X-Y recorder using a dot printer used to implement the method of the present invention.

That is, when the main body of the recording device is an X-Y recorder using a dot printer, analog signals to be measured on _the After being converted into a signal, it is a calculation control means.
It is sent to CPU (Central Processing Unit) 3. On the other hand, the main body of the recording device is an X-
When it is a Y plotter, input signals for the X-axis and Y-axis from an external controller (not shown) are taken in via the input terminal _T2 , and input signals are input to the input control means 2.
After performing predetermined input control, it is sent to the CPU 3.

In the CPU 3, sampling data based on digitally converted or input-controlled signals is temporarily held in a RAM (random access memory) 5, and this held sampling data and a ROM (read only memory)
The interpolation data pre-stored in 4 is retrieved at a predetermined timing and stored in the X-Y recording RAM.
6 as recording data.

After all the prescribed processing is completed, the CPU 3 reads out the recording data temporarily stored in the X-Y recording RAM 6, sends an activation signal to the recording means 7 constituted by a dot printer,
This recording means 7 can perform line interpolation at a predetermined density based on recording data.

Next, a processing procedure for line interpolation as an embodiment of the method of the present invention, which is executed via the X-Y recorder having such a configuration, will be described.

Figures 2A and 2B show that in the method of this invention, the X-Y recording RAM 6
It is an explanatory diagram set for convenience in order to show the positional relationship between. Among these, in Figure 2 A, the starting point (or ending point) has coordinates x, y (0, 0), (1199,
0), (1199, 1199), and (0, 1199) are set at arbitrary positions (x ₀ , y ₀ ) within the rectangular surrounding frame, and Figure 2 (b) shows the case where The figure shows the address and bit position of each coordinate value in the XY recording RAM 6 in this case.

That is, the 8-bit X-
For the Y recording RAM 6, the address where (0, 0) of the XY coordinate values is located is set as TOP. Also, the MSB in this TOP address
Coordinates (0, 0) of bit position of (most significant bit)
Set as the position of Thereafter, the positions of coordinates (1, 0), (2, 0), etc. are successively set while sequentially shifting the bit positions. Therefore, the position of the coordinates (1199, 0) in the X-Y recording RAM 6 is located at the address TOP+149, and the bit position at that address is
This is the LSB (least significant bit) bit position. Furthermore, if the MSB bit position at the address of TOP+150 is set as the position of coordinates ( ₀ , ₁ ),
-Y The position in the recording RAM 6 can be expressed by the following equation.

That is, the address in the XY recording RAM 6 corresponding to the coordinates (x ₀ , y ₀ ) can be determined by TOP+150·y ₀ +INT(x ₀ /8) (1). Note that INT (x ₀ /8) in equation (1) indicates an integer value when x ₀ is divided by the number of bits, 8.

Furthermore, regarding the actual bit position at the specific address in the XY recording RAM 6 to which the coordinates (x ₀ , y ₀ ) produced by equation (1) belong, 7-(x ₀ mod 8) It can be found by (2). Note that (x ₀ mod 8) in equation (2) indicates the remainder value when x ₀ is divided by the number of bits, 8.

Thus, the address in the X-Y recording RAM 6 of the coordinates (1199, 1199) can be determined by the formula TOP + 150 x 1199 + 149 based on the formula (1) above, and the actual bit position at the address in that case is is the LSB position.

Note that the positional relationship between the XY coordinate values and the XY recording RAM 6 is not limited to that shown in the example shown above, and can be freely determined as necessary.

Next, using an example where the positional relationship between the XY coordinate values and the X-Y recording RAM 6 is as shown in Figure 2 A and B, we will explain how to set the thickness and density of the line to be interpolated. Regarding specified processing, the procedure is explained in the third section.
This will be explained according to the flowchart shown in the figure. In addition, in the figure, for convenience of explanation, the density of the lines is
Although the example is shown in which the settings are divided into four levels: 25%, 50%, 75%, and 100%, the darkness can be set freely within the possible range.

Therefore, when setting the line thickness, first perform input processing to set the line thickness, then set the desired thickness, and then perform the input process to set the line thickness. Perform input processing,
Set the darkness. In other words, regarding the density of the line, if the density to be set is 100%, the even number data variable EVEN (11111111) _B is
Set by inputting (11111111) _B to the odd number data variable DD. Also, if this is 25%, enter (00010001) _B in EVEN and (01000100) _B in ODD, and if it is 50%, enter (01010101) _B in EVEN and (10101010) _B in ODD. If it is 75%, set the density of each line by entering (11101110) _B in EVEN and (10111011) _B in ODD. Note that EVEN is a variable into which even number masking data is input, and ODD is
This is a variable to which odd number masking data is input, and a line is drawn at the position where the bit data is "1".
It is assumed that no line is drawn at the "0" position.

In this way, after passing through the designation process for setting the thickness and density of the line, the process moves on to line interpolation processing for performing line interpolation according to this designation process.

FIG. 4 is a flowchart showing the processing procedure at that time.For convenience, we will use an example where the thickness of the basic line is 1 dot, and line interpolation is performed with a thickness of 3 dots, which is three times that thickness. explain.

First, determine the starting point position (x ₁ , y ₁ ) and ending point position (x 2 , y ₁ ) of the basic line on which you want to perform line interpolation.
y ₂ ). After that, in order to determine whether the basic line is long in the X-axis direction or Y-axis direction when line interpolation is performed between the start point and the end point, the absolute value |x ₂ −x ₁ | and the absolute value |y Compare the magnitude relationship with ₂ −y ₁ |.

Below, |x ₂ −x ₁ |≧|y ₂ −y ₁ | and |x ₂ −
The processing for the case x ₁ |<|y ₂ −y ₁ | will be explained separately.

First, if |x ₂ −x ₁ |≧|y ₂ −y ₁ |, that is, if the basic line to be recorded between the start point and the end point is longer in the X-axis direction than in the Y-axis direction To explain, the X coordinate L _1x of the starting point is x ₁
, the Y coordinate L _1y of the starting point is y ₁ +1, the X coordinate L _2x of the ending point is x ₂ , and the Y coordinate L _2y of the ending point is y ₂ +
By inputting 1 respectively, the coordinate values of the starting point and ending point are shifted by +1 in the Y-axis direction, and then line interpolation is performed between the starting point and the ending point at a predetermined density. Next, set x ₁ to the starting point's X coordinate L _1x , set y ₁ to the starting point's Y coordinate L _1y , and set the ending point's X coordinate L _2x.
By inputting x ₂ for , and y ₂ for the Y coordinate L _2y of the end point, set the coordinate values of the start and end points of the basic line located at the center, and then set the coordinates between the start and end points. Line interpolation is performed at the density of . Finally, set x ₁ to the X coordinate L _1x of the starting point, and y ₁ to the Y coordinate L _1y of the starting point.
By inputting x ₂ for the end point's X coordinate L _2x and y _{2 -1} for the end point's Y coordinate L _2y , the coordinate values of the start and end points can be changed by -1 in the Y-axis direction. After performing the process of shifting by the amount, line interpolation is performed at a predetermined density between the start point and the end point, thereby completing the line interpolation of FUTOSA=3 consisting of three lines in total.

On the other hand, if |x ₂ −x ₁ |<|y ₂ −y ₁ |, that is, if the basic line to be recorded between the start point and the end point is longer in the Y-axis direction than in the X-axis direction To explain, the X coordinate L _1x of the starting point is x ₁
+1, y ₁ for the Y coordinate L _1y of the start point, x 2 +1 for the X coordinate L _2x of the end point, and x ₂ +1 for the Y coordinate L _2y of the end point.
By inputting _y2 , the coordinate values of the start point and end point are shifted by +1 in the X-axis direction, and then line interpolation is performed at a predetermined density between the start point and end point. Next, set x ₁ to the starting point's X coordinate L _1x , set y ₁ to the starting point's Y coordinate L _1y , and set the ending point's X coordinate L _2x.
By inputting x ₂ for , and y ₂ for the Y coordinate L _2y of the end point, set the coordinate values of the start and end points of the basic line located at the center, and then set the coordinates between the start and end points. Line interpolation is performed at the density of . Finally, the X coordinate L _1x of the starting point is x ₁ -1, the Y coordinate L _1y of the starting point is y ₁ , and the X coordinate L _2x of the ending point is x ₂ -1.
The Y coordinate L _2y of the end point can be determined by inputting y ₂ respectively.
After performing processing to shift the coordinate values of the start point and end point by -1 in the X-axis direction, line interpolation is performed between the start point and end point at a predetermined density to create FUTOSA consisting of a total of three lines. The line interpolation process in step 3 is completed. Although the explanation has been omitted, hypothetically
When FUTOSA=1 is set, among the above line interpolations, only the basic line is interpolated, and when FUTOSA=2 is set, line interpolation is performed twice up to the basic line. variables, such as those that can be executed by
Line interpolation can be performed as appropriate depending on the FUTOSA setting.

FIG. 5 is a flowchart showing a specific procedure for performing the line interpolation process at a predetermined density as shown in FIG.

According to this, the process for line interpolation first starts by determining the magnitude relationship between L _1x and L _2x described above, and if L _1x ≦L _2x , then the magnitude relationship between L _1y and L _2y is The process moves to the relationship determination step. Also, L _1x > L _2x
If so, the start point and end point are swapped by swapping L _1x and L _2x and L _1y and L _2y , respectively, and then the process moves to the step of determining the magnitude relationship between L _1y and L _2y . .

In the step of determining the magnitude relationship between L _1y and L _2y , it is determined whether L _1y ≦L _2y or L _1y ≧L _2y , that is, whether the interpolated line slopes upward to the right or downward to the right. It is determined.

First, let us explain the case where L _1y ≦L _2y , where the line slopes upward to the right.L _2x −L _1x and the absolute value |L _2y −L _1y
| and the magnitude relationship, that is, the length in the X-axis direction and the length in the Y-axis direction from the start point to the end point are compared to determine the length. As a result of discrimination, (L _2x −L _1x )≧｜
When L _2y −L _1y ｜ _, that is _, when the direction of the Input the numerical values of L _2y - L _1y into the variable Sd indicating the length in the direction, and set "0" to the predetermined processing variable A.
and "3" is input to the predetermined processing variable B, respectively. Also, when (L _2x −L _1x )<|L _2y −L _1y |, that is, when the Y-axis direction is longer, the value of L 2y −L _1y is set in the variable Ld, and the value of L _2y −L 1y is set in the variable Sd. The numerical values of L _2x -L _1x are respectively input, and "1" is input into the predetermined processing variable A and "3" is entered into the predetermined processing variable B.

On the other hand, if we explain the case where L _1y > L _2y where the line slopes downward to the right, L _2x −L _1x and the absolute value |L _2y −
The magnitude relationship with L _1y |, that is, the length in the X-axis direction and the length in the Y-axis direction from the start point to the end point are compared to determine the length. As a result of discrimination, (L _2x −
When L _1x ) ≧ |L _2y −L _1y |, that is, when the X-axis direction is longer, set the value of L _2x −L _1x to the variable Ld, and set the value of L _1y −L _2y to the variable Sd. Each numerical value is input, and "0" is input into the predetermined processing variable A, and "4" is entered into the predetermined processing variable B. Also,
When (L _2x −L _1x )<|L _2y −L _1y |, that is, Y
If the axial direction is longer, L _1y − is added to the variable Ld.
The numerical value of L _2y and the numerical value of L _2x −L _1x are respectively input into the variable Sd, “2” is input into the predetermined processing variable A, and “4” is input into the predetermined processing variable B.

In this way, after completing the input processing that corresponds to each line pattern by performing such patterning processing, by inputting Ld/2 for the change Ct for each line pattern,
Initializes the criteria for determining coordinate movement when performing line interpolation. In other words, when the ideal line is the line connecting the starting point and the ending point, the variable Ct is
This variable is used to perform line interpolation in a direction closer to this ideal line.

After initializing the variable Ct in this way, in order to know where the starting point is in the X-Y recording RAM 6, first set the variable ADR in the X-Y recording RAM 6.
6 start address (in the case of Figure 2 B)
TOP). Next, for the ADR after inputting the first address, based on the above formula (1),
By inputting ADR+150×L _1y +INT (L _1x /8), the starting point address is calculated. In addition, by inputting the value ^27-(L1xmod8) into the variable BITA to set the bit where the coordinate value of the start point should be located to "1" in the byte corresponding to this calculated address,
Processing is performed to set only the bit position of the starting point coordinates in the calculated address to a value of "1", and the position of the starting point in the XY recording RAM 6 is specified.

After specifying the position of the starting point in the X-Y recording RAM 6, proceed to the next step (the step following the connector in FIG. 5), which is the step of determining whether _L1y is an even number or an odd number. . In this determination step, when it is determined that _L1y is an odd number, it is determined that the line has a predetermined density from among the variable EVEN and the variable ODD, which are set in advance to determine the density of the line in FIG. , and the variable BITB contains ODD as odd number data corresponding to the selected density, and the variable BITC contains ODD as even number data corresponding to the selected density.
Enter EVEN and set the rewriting data. Furthermore, when it is determined that L _1y is an even number, EVEN is input to BITB and ODD is input to BITC to set rewriting data.
Note that BITB and BITC here refer to the masking data set according to the line density.
This is a variable to save EVEN and ODD.

After that, the X-Y recording RAM where the starting point is located.
The byte data at the position of the variable ADR, which is the address in 6, is calculated using the logical formula (byte data where ADR is located) {(BITA)} (BITB)}, and the result is used for X-Y recording.
Rewrite as new byte data in RAM6.
The above logical formula first performs the AND of the BITA with the masking data BITB, and then performs the OR of this AND and the byte data to mask the line to the specified density. It is for going.

Then, the value of Ld is input to the repetition variable LOOP, and the following process is repeated until LOOD=0, that is, until the line interpolation is completed.

That is, by comparing the small relationships between the variables Ct and Sd,
In the case of Ct≧Sd (when the ideal line connecting the starting point and the ending point is close to the position shifted by one dot in the direction of the long movement distance), set Ct as Ct−Sd, and The processing based on FIG. 6 (described later) corresponding to the set value of the processing variable A is performed (one dot is moved in the direction of the longer movement distance), and Ct
<Sd (when the ideal line is close to the position shifted by one dot in both the X and Y directions), Ct is set to Cu.
−Sd+Ld, and similarly set the predetermined processing variable B.
Processing based on FIG. 7 (to be described later) corresponding to the set numerical value (moves one dot at a time in both long and short moving distance directions) is performed.

In this way, after performing processing corresponding to each case, the byte data at the ADR position is calculated using the logical formula (byte data at the ADR position) 〓{(BITA)〓(BITB)} Then, subtract 1 from the already set repetition variable LOOP,
Line interpolation is executed by repeating the same process until LOP=0.

6 and 7 are flowcharts showing specific procedures for a processing routine that corresponds to predetermined processing variables A and B inserted as one step in FIG. 5.

Of these, the 6th one shows the routine of processing variable A.
To explain the diagram, it is determined whether the processing variable A is the already set value "0", "1", or "2" in Figure 5, and the interpolation line becomes horizontal. If A = 0, first move it by 1 dot in the
MSB), in the variable BITA at that time
If the variable CY for inputting the LSB value is 0, processing ends; if it is 1, 1 is added to ADR and processing ends. Also, if A=1, where the interpolation line rises vertically in the Y-axis direction, ADR
Input +150, move one dot in the positive direction of Y, swap BITB and BITC, and finish the process. On the other hand, if the interpolation line is vertically descending in the Y-axis direction (A=2), ADR-150 is added to ADR.
Input , move one dot in the negative direction of Y, and again swap BITB and BITC.
In this way, by swapping the variables BITB and BITC, if the Y coordinate value is an even number, BITB=
EVEN, and in case of an odd number, BITB=ODD.

On the other hand, to explain the routine of processing variable B in FIG.
If B = 3 in the upper right corner,
Input ADR+150 to ADR and move it by one dot in the positive direction of Y. If B=4, which is downward to the right, input ADR-150 to ADR and move it by one dot in the negative direction of Y. After completing such movement processing, in any case, BITB and BITC are exchanged. in this way,
By swapping the variables BITB and BITC,
If the Y coordinate value is an even number, set BITB=EVEN,
In the case of an odd number, BITB=ODD can be set. After completing this process of exchanging BITB and BITC, move it by one dot in the and assign it to MSB), the variable CY for inputting the value of LSB in variable BITA at that time is 0.
If it is 1, then 1 is added to ADR and the process is finished.

By performing each line interpolation according to such a procedure, the line interpolation process in the case of variable FUTOSA=3 is completed.

Figures 8A to 8D schematically show line interpolation with different densities obtained by following the above processing steps. When A is 100% density, RO indicates the case where line interpolation is performed at a density of 25%, c is 50%, and d is 75%.

Further, FIGS. 9 and 10 show the recording state after line interpolation is actually performed by the method of this invention. Of these, Figure 9 shows A as darkness.
When it is 100%, B indicates 50% density and C indicates 25% density. Also, in Figure 10, when A is 100% density like Figure 9 A,
B indicates darkness of 75%, and C indicates darkness of 50%.

Accordingly, by recording the actual line interpolation shown in Figures 9 and 10, it is possible to confirm that each line is easily distinguishable even when the line thickness is set to be the same. did it.

〔Effect of the invention〕

As described above, according to the method of the present invention, even if the line thickness is the same, line interpolation can be performed by changing the density, so that while maintaining the visibility of each line, The lines can be easily identified from each other.

[Brief explanation of drawings]

FIG. 1 shows the X-
A main part configuration diagram of an embodiment of a Y recorder, Figure 2 A and B are explanatory diagrams showing the mutual relationship between XY coordinate values and XY recording RAM, and Figure 3 shows line thickness and density. Figure 4 is a flowchart showing the line interpolation procedure when the line thickness is set to three times the basic thickness.
5 is a flowchart showing the detailed procedure of the line interpolation process in FIG. 4, FIG. 6 is a flowchart showing the detailed procedure of the "processing A routine" step in FIG. 5, and FIG. The figure shows the fifth
FIG. 8 is a flowchart showing the detailed procedure of the "processing B routine" step in the figure. 10 and 10 are actual records of line interpolation performed by the method of the present invention, and FIG. 11 is an enlarged pattern diagram schematically showing the state of line interpolation performed by the conventional method. 1... A/D conversion means, 2... Input control means,
3...CPU, 4...ROM, 5...RAM, 6...
...X-Y recording RAM, _T1 , _T2 ...Input terminals.

Claims (1)

[Claims] 1. Equipped with an arithmetic control means for performing a predetermined arithmetic operation based on the coordinate values of two given points, and using the two points as a starting point and an end point, line interpolation is performed between the two points by a dot printer based on the data of the arithmetic control means. A line interpolation method for an X-Y recorder, which consists of a specification process for setting the thickness and density of the line to be interpolated, and a line interpolation process that is executed according to these specification processes. , the specification process is performed by making it possible to specify a thickness that is an integer multiple of one dot as a base, and setting the density by variable processing according to the density of the line that is required. In the interpolation process, first, the position of the interpolation line is set according to the line thickness specified by the above specification process, and then, the longitudinal direction and the inclination direction of the line to be interpolated are used as determining factors, and in each case, After performing patterning processing in the repeated line interpolation operation, the address and bit position of the starting point in the memory are specified, and depending on whether the Y coordinate value of the starting point in this case is an even number or an odd number, Rewrite data is set using variable data corresponding to the line density set in the specification process, and the byte data in which the specified address is located in the memory is rewritten according to the rewrite data. A method for line interpolation in an X-Y recorder, characterized in that the line interpolation is performed in a moving direction determined by a predetermined processing routine, and the same processing is repeated until reaching the end point.