JPH01100421A - Line interpolation method in X-Y recorder - Google Patents

Abstract

PURPOSE:To enable identification between lines maintaining a high visibility respective to the lines, by making a difference in thickness of the lines themselves and a difference in the density thereof as discrimination indicator for the lines. CONSTITUTION:An analog signal to be measured is inputted into a CPU 3 through an A/D conversion means 1. The CPU 3 holds a data converted into digital from analog temporarily into an RAM 5 and the data and an interpolation data previously stored into a RAM 4 are picked up at a specified timing to be stored into a RAM 6 for X-Y recording as data for recording. With the CPU 3, the data for recording of the RAM 6 for X-Y recording is read out and a line interpolation is performed at a specified density based on the data for recording by a recording means 7.

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 varying densities using a dot printer. X made like this
-Relates to a line interpolation method in a Y recorder.

[Technical Background of the Invention] Conventionally, with regard to line interpolation methods for recording many types of lines in a way that allows identification of oneself and others using an X-Y recorder using a dot printer, there are advantages such as that the interpolation process is relatively simple. For this reason, a method is often used in which the thickness of the line is changed in several stages for recording.

FIGS. 11(a) and 11(b) show conventional examples in which line interpolation is performed using a dot printer. Of these, Fig. 1 (a) shows the basic line 10 formed by continuously recording one dot, and Fig. 11 (b) shows the thickness of the line by composing the line width with three dots. This shows a wide line 11 in which the angle is three times the basic line 1°. In the conventional method, the thickness of the line is changed in several stages and recorded, thereby making it possible to discriminate the type of each line.

[Problems to be Solved by the Invention] By the way, the method of interpolating lines in such a way that the thickness of each line can be differentiated by changing the thickness of each line in multiple stages, as in the conventional method described above, is Since the thickness is fast and clear, the type of line can be easily identified using this as a clue. 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 an unsightly look.

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.
For this reason, there was a problem in that it was not possible to fully meet the diverse needs of users.

"Object of the Invention" This invention was devised in view of the above-mentioned problems found in the conventional method.The purpose of this invention is to identify only the difference in the thickness of the line itself when identifying each recorded line. The object of the present invention is to provide a line interpolation method in an X-Y recorder that makes it possible to identify the line by using the difference in the thickness of the line itself and the difference in the shade of the line as the discrimination index without using it as an index. .

[Means for Solving the 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 for an X-Y recorder that uses interpolation, which includes a specification process for setting the thickness and density of the line to be interpolated, and a line interpolation process executed according to these specification processes. Among these, the specification process allows specification of a thickness that is an integer multiple of the L dot as a base, and also sets the density by variable processing according to the required line density. The line interpolation process is performed by first setting the position of the interpolation line according to the line thickness specified by the specification process, and then determining the longitudinal direction and inclination direction of the line to be interpolated. After performing patterning processing according to each case, 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 line is After performing data processing based on variable data preset according to the density of the data, and rewriting the byte data at which the specified address in the memory is located according to the processed data,
Its structural feature is that it moves in a moving direction determined by a predetermined processing routine for line interpolation, and repeats the same processing until it reaches the end point.

[Example] Hereinafter, the present invention will be explained in detail with reference to the example 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.

In other words, the main body of the recording device is an X-ray printer using a dot printer.
When it is a Y recorder, the analog signals to be measured for the X-axis and Y-axis are taken in through the input terminal T, and the
/D conversion conversion means After being converted into an upstream digital signal,
The data is sent to a CPU (central processing unit) 3 which is an arithmetic control means. On the other hand, when the main body of the recording device is an X-Y block using a dot printer, input signals for the X-axis and Y-axis from an external controller (not shown) are taken in via the input terminal T's, and input control is performed. After predetermined input control is performed by the means 2, the data is sent to the CPU 3.

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

After all the predetermined processing is completed, the CPU 3
The recording data temporarily stored in the recording RAM 6 is read out, and an activation signal is sent to the recording means 7 constituted by a dot printer, and this recording means 7 interpolates lines at a predetermined density based on the recording data. can be done.

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 explained.

Figures 2 (a) and (b) show the XY that should be the starting point (or ending point) of the two given points in this invention method.
It is an explanatory diagram set for convenience to show the positional relationship with the X-Y recording RAM 6 in terms of coordinate values. Among these, in Figure 2 (a), the starting point (or ending point) is at the coordinate x
, y as (0°0), (1199,O), (119
9,1199) and (0,1199) are set at arbitrary positions (xa, yo) within the rectangular surrounding frame, and Figure 2 (b) shows each point in this case. It shows the address and bit position of the coordinate value in the X'-Y recording RAM 6.

That is, for the 8-bit X-Y recording RAM 6 shown in FIG.
Set the address where is located as TOP. Also, the MSB (most significant bit) in this TOP address
Set the bit position of as the position of coordinates (0, O).

After that, by sequentially shifting the bit position, the coordinates (1, 0),
The positions of (2°0)... are set sequentially. Therefore, the coordinates (11
The position 99°0) is located at the address %TOP+149, and its bit position is the bit position of the LSB (the least significant bit) at the address. Also, the MSB in the TOP+150 address
If the bit position of is set as the position of coordinates (0, 1), the X-Y
Recording r? The position at AM6 can be calculated using the following equation.

That is, r? for X-Y recording corresponding to the coordinates (xa, yo)? For an address in AM6, TOP+ 1so-yO+ INT(x o' / 8
)...It can be determined by (1). In addition,
INT (xo/8) in formula (1) is
Indicates the integer value when xo is divided by the number of bits, 8.

Also, the coordinates (xo) calculated by equation (1).

The actual bit position at the specific address in the XY recording RAM 6 to which yo) belongs can be determined by 7-(xo mad 8) (2). Note that (Xomo in formula (2)
d8) indicates the remainder value when xo is divided by the number of bits, 8.

The above coordinates (1199, 1199) No.X-Y
The address in the recording RAM'6 is based on the formula (1) above.

It can be determined using the formula TOP + 150 x 1199 + 149, and the actual bit position at the address in this case 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 XY recording RAM 6 is as shown in Figure 2 (a) and (b), determine the thickness and density of the line to be interpolated. The procedure for specifying the settings will be explained with reference to the flowchart shown in FIG.

For convenience of explanation, the figure shows an example in which the line density is divided into four levels: 25%, 50%, 75%, and 100%, but you can use it freely to the extent possible. You can set the density to .

However, first, when setting the line thickness,
After performing input processing to set the line thickness,
After setting the desired thickness, input processing is performed to set the density of the line, and the density is set. In other words, regarding the density of the line, if the density to be set is 100%, the even number data variable EVEN (I
(IIIllll) e is set by manually inputting (IIIllllII) e into the odd number data variable ODD. Also, if this is 25%, EVEN (0)
0010001), to ODD (01000100
) By doing each B manually, if it is 50%, E
VENi: (01 old and old) a, 0110 ni (In1
01010) By inputting a respectively, if it is 75%, EVENI: (I l 101110) s
, 0DDG, : (+01110 'II) 8 to set the density of each line.

Furthermore, EVEN is a variable into which masking data for even numbers is input, and ODD is a variable into which masking data for odd numbers is input. A line is drawn at the position where the data is "1", and a line is drawn at the position where the data is "0". It shall not be drawn.

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, the explanation will be based on an example in which, when the thickness of the basic line is 1 dot, line interpolation is performed with a thickness of 3 dots, which is three times that thickness. do.

First, the starting point position (xI, yI) and the ending point position (x, ya) of the basic line on which line interpolation is to be performed are input. 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 1xzx+l and the absolute value 1y are determined.
2-yI Compare the magnitude relationship with l.

Below, the case of 1xxx+l≧ly*-yl 1 and -1x
The processing for the case of z −XI < I yj−yr 1 will be explained separately.

First, if we explain the case where l xz -XI l≧1ys-yII, that is, the basic line to be recorded between the start point and the end point is longer in the The X coordinate Ltx of the point is X□, and the Y coordinate Lay of the starting point is y.

By inputting +1, x2 for the end point's X coordinate Lax, and y and +1 for the end point's Y coordinate L2y,
After performing a process of shifting the coordinate values of the starting point and the ending point by +1 in the Y-axis direction, line interpolation is performed between the starting point and the ending point at a predetermined density. Next, set X to the starting point's X coordinate L+x, set yl to the starting point's Y coordinate L+y, and set the ending point's X coordinate La to
By inputting x2 for x and y2 for the Y coordinate Lay 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 a predetermined density. Finally, the X coordinate of the starting point L+x
xl, the Y coordinate Lly of the starting point is yl-1, the X coordinate Lax of the ending point is x2, and the Y coordinate Lzy of the ending point is
By inputting ya 1 for each, the coordinate values of the start point and end point are shifted by -l in the Y-axis direction, and then line interpolation is performed at a predetermined density between the start point and end point. , FUTOSA consisting of 3 lines in total = 3
Finish line interpolation.

On the other hand, if lx, -XI < Iyz -yI l, that is, 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, The X coordinate Lax of the starting point is x, +1
, the Y coordinate of the starting point is 1. y for ly.

, and the X coordinate Lax of the end point is X 2 + 1,
By inputting y into the Y coordinate L2y of the end point, the coordinate values of the start point and end point are shifted by +1 in the X-axis direction, and then a line is drawn with a predetermined density between the start point and end point. Interpolate. Next, set xl to the X coordinate L+x of the starting point,
The Y coordinate of the starting point L + y is yl, and the X coordinate of the ending point L
By inputting x2 into ax and y2 into the Y coordinate Lay 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 based on density. Finally, the X coordinate L of the starting point
By inputting X+ 1 for +x, 7fold for the Y coordinate Lay of the starting point, x, -1 for the X coordinate Lax of the ending point, and y2 for the Y coordinate Lay of the ending point, the starting point and After performing processing to shift the coordinate value of the end point by -1 in the X-axis direction, line interpolation is performed between the start point and the end point at a predetermined density to create FUTO3A, which consists of a total of three lines.
= 3 line interpolation process ends. Although the explanation is omitted, if FUTO3A=1 is set,
Among the above line interpolations, it can be executed by performing line interpolation only on the basic line, or by performing line interpolation twice up to the basic line if FtlT_SA=2 is set. etc., variable FUTO3
Depending on the setting value of A, line interpolation can be performed as appropriate.

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, +x and LAX described above, and if Lax≦Lax, the process proceeds to the step of determining the magnitude relationship between Lay and Lay. and move on. Also, Lax>Lax
If so, the start point and end point are swapped by swapping Lax and L2x and l, ly and Lay, respectively, and then the process moves to the step of determining the magnitude relationship between Lay and Lay.

In the step of determining the size relationship between Lay and Lay,
It is determined whether LIy≦Ly or Lly>L2N, that is, whether the interpolated line is upward to the right or downward to the right.

First, to explain the case where LAy≦L2y, where the line slopes upward to the right, L 2X - L IX and the absolute value 1Lzy
-L+yl, 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 their length. As a result of discrimination, (L, xLax)≧I
When Lay L + yl, that is, when the X-axis direction is longer, the value of Lax Lax is set to the variable Ld indicating the length in the longer direction of movement distance, and the value of Lax Lax is set to variable Sd indicating the length in the shorter direction of movement distance. Input the numerical values of Lay Lay into , enter "0" into the predetermined processing variable, and enter "3" into the predetermined processing variable B. Also,
(L2x-L +x) < I L x M L ry
l, that is, if the Y-axis direction is longer, set the value of L2y-Lay to the variable Ld, and set LA to the variable Sd.
Input the numerical values of X-LAX, and input "1" into the predetermined processing variable and "3" into the predetermined processing variable B.

On the other hand, to explain the case where the line slopes downward to the right, L ly > Lay, LaX-Lax and the absolute value IL
The magnitude relationship with ay L+yl, 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 the discrimination, (L 2X-L I
When X)≧l L 2y−L ryl, that is, X
If the axial direction is longer, set L2X to the variable Ld.
The numerical value of LIX is inputted into the variable Sd, the numerical value of L'By-Liy is inputted into the variable Sd, "0" is inputted into the predetermined processing variable A, and "4" is entered into the predetermined processing variable B. Also, when (L, x - L, x) < l Lzy - L + yl, that is, when the Y-axis direction is longer, set the value of Lay L2y to the variable Ld and 14□ to the variable Sd.
Input the numerical values of xL+x and select the predetermined processing variable A.
Input "2" to "2" and "4" to predetermined processing variable B, respectively.

In this way, after completing the input processing corresponding to each line pattern by performing such patterning processing, line interpolation is performed by inputting Ld/2 for the variable Ct for each line pattern. Initializes the criteria for determining coordinate movement when executing . In other words, the variable Ct is a variable for making it possible to interpolate a line in a direction closer to the ideal line when the line connecting the starting point and the ending point is defined as an ideal line.

After initializing the variable C in this way, the starting point is
In order to know the position of the Y recording RAM 6, first input the start address of the XY recording RAM 6 (TOP in the case of FIG. 2(b)) into the variable ADH.

Next, for 80H after inputting the first address, based on the above formula, ADR+ 150 x L +y+
By inputting INT (L lx/ 8 ), the address of the starting point is calculated. In addition, in the byte corresponding to this calculated address, the bit where the coordinate value of the start point should be located is set to "I".
By inputting the LIxmad81 +7) value, only the portion corresponding to the bit position of the starting point coordinates in the calculated address is set 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 X-Y recording ■ (ΔM6), proceed to the next step (the step following the connector ■ in Figure 5), which is the step of determining whether Lay is an even number or an odd number. In this determination step, when it is determined that Lay is an odd number, the desired density is selected from the variable EVEN and the variable ODD, which are preset to determine the density of the line in FIG. The variable 111TO contains ODD as data for odd numbers corresponding to the selected density, and the variable BITC contains EVEN as data for even numbers corresponding to the selected density.
Enter each. Also, when Lty is determined to be an even number, BITBG:In is set to EVEN, and BI
TC+ and : input ODD, respectively. Furthermore, what are BITB and BITC mentioned here?

E of masking data set according to line density
This is a variable for storing VEN and ODD.

After that, the byte data at the position of the variable ADH, which is the address in the XY recording RAM 8 where the start point is located, is converted to (byte data where ADH is located) V ((BI
TA) Δ(BIT[l))), and the result is rewritten as new byte data in the XY recording RAM 6. Above, the above logical formula is the above BITA
This is to mask the line to a specified density by first performing a logical AND with BITB, which is masking data, and then logically ORing this logical product with the byte data. .

Therefore, input the value of Ld into the repeating variable LO port P,
The following process is repeated until LOGP=O, that is, until line interpolation is completed.

That is, the magnitude relationship between variables Ct and Sd is compared, and Ct
In the case of ≧Sd (when the ideal line connecting the starting point and the ending point is close to a position shifted by one dot in the direction of the long movement distance), %Ct is set as CL-Sd, and the predetermined value that has already been specified is set. Processing is performed based on the set value of processing variable A (one dot is moved in the direction of the longer movement distance) as shown in FIG.
(if it is close to the position shifted by one dot in both directions),
Ct is set as Ct - Sd + Ld, and the processing based on Fig. 7 described later corresponding to the numerical value set for a predetermined processing variable B (moves one dot at a time in both directions with long and short moving distances) do.

In this way, after performing processing corresponding to each case, the byte data at the ADH position is converted to the logical formula (byte data at the ADH position) V ((BI
TA) △ (BITB) ) and rewrite it again, and then set the repetition variable L that has already been set.
Line interpolation is performed by subtracting 1 from OOP and repeating the same process until LOOP=0.

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

Of these, if we explain about FIG. 6 showing the routine of processing variable A, we will determine whether the processing variable is the numerical value already set in FIG. 5, ``0'', rlJ, or ``2''. If A=O, where the interpolation line is horizontal, first move one dot in the X direction (
In a specific example, the value of the variable BITA is shifted to the right by l bits, the LSB value is assigned to the variable CY, and the MS
If the variable CY for inputting the value of the LSB in the variable old TA is 0, the process ends; if it is I, 1 is added to ADH and the process ends. If the interpolation line is still vertically rising in the Y-axis direction (A=1), input ADH+150 to ADH, move it by 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), input ADH-150 to ADH, move it by one dot in the negative direction of Y, and again, BITB
and BITC. In this way, the variable BITB
By exchanging BTC and BTC, it is possible to set BITB=EVEN when the Y coordinate value is an even number, and set old TB=ODD when the Y coordinate value is an odd number.

On the other hand, to explain the routine of processing variable B in FIG. If upstream B=3, input ADH+150 to ADH and move one dot in the positive direction of Y. If B=4, which is downward to the right, input ADH-150 to ADH and move it by one dot in the negative direction of Y. After completing such a movement process, BIT[l and BITC are exchanged in any case. In this way, by replacing the variables 81TB 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 the process of exchanging ITB and BVl'C in this way, move it by one dot in the X direction (in the specific example, shift the value of the variable BITA by one dot to the right, and
The value of SB is assigned to the variable CY and also to the MSB), and if the variable CY for inputting the value of the LSB in the variable BITA at that time is O, the process ends, and if it is 1, add 1 to ADH. to finish processing.

By performing each line interpolation according to such a procedure, the line interpolation process in the case of variable FUTO3A=3 is completed.

Figures 8 (a) to (:) schematically show line interpolation with different densities obtained by following the above processing steps, and (a) is shown at 100% density. If so, (b) is 25%, (c) is 50%, and (d) is 75%.
This shows the case where line interpolation is performed at a density of %.

Moreover, FIG. 9 and FIG. 1O show the recording state after actually performing line interpolation using the method of this invention. In FIG. 9, when (a) is 100% density, (b) is 50% density, and (c) is 25% density. In addition, in Figure 1O, when (A) is assumed to have a density of 100% as in Figure 9 (A), (B) represents a density of 75%, and (C) represents a density of 50%. Each is shown below.

Accordingly, by recording the actual line interpolation shown in Figures 9 and 1O, we were able to confirm that it was easy to identify each line even though the line thickness was set to be the same. .

[Effects of the Invention] As described above, according to the method of this invention, even if the line thickness is the same, line interpolation can be performed by changing the density, so that the visibility of each line can be improved. Although the lines are maintained, the lines can be easily identified from each other.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of an embodiment of an X-Y recorder for carrying out the method of this invention, and Figs. 2 (a) and (b)
is an explanatory diagram showing the interrelationship between XY coordinate values and FIG. 5 is a flowchart showing the detailed line interpolation procedure in FIG. 4, and FIG.
Flowchart showing the detailed procedure of the "Processing Δ Routine" step in FIG. 5. FIG. 7 is a flowchart showing the detailed procedure of the "processing B routine" step in FIG. Pattern diagrams, Figures 9 and 10 are actual records of line interpolation performed by the method of the present invention, and Figure 1I is an enlarged pattern diagram schematically showing the state of line interpolation performed by the conventional method. be. 1-A/D conversion means, 2...input control means, 3
・-CPU, 4・-ROM. 5-RAM, '6.RAIJ for X-Y recording. T1. Tx”・Input terminal patent applicant Hioki Electric Co., Ltd. Figure 1 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] (1) A calculation control means is provided to perform a predetermined calculation based on the coordinate values of two given points, and a dot printer performs line interpolation between the two points as a starting point and an end point based on the data of the calculation control means. This is 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 executed in accordance with these specification processes. Among these, the specification process is performed by making it possible to specify a thickness that is an integral multiple of 1 dot as a base, and setting the density by variable processing according to the required line density. In the line interpolation process, first, the position of the interpolation line is set according to the line thickness specified by the specification process, and then the longitudinal direction and the inclination direction of the line to be interpolated are used as determining factors, respectively. After performing patterning processing according to the case, the address and bit position of the starting point in the memory are specified, and the density of the line is determined depending on whether the Y coordinate value of the starting point in this case is an even number or an odd number. After performing data processing based on variable data set in advance according to 1. A line interpolation method for an X-Y recorder, characterized by moving in a moving direction determined by a predetermined processing routine and repeating the same processing until reaching an end point.