JPS6184680A - Graphic display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a graphic display method for displaying a graphic by a raster scan method based on data read from a memory storing data necessary for displaying one graphic. [Prior Art] Conventionally, in order to display characters or figures by digital signal processing, data read out from a memory storing one display figure, that is, a character generator, is used.
Graphic display devices that display graphics using a raster scan method are used. This display first appears as shown in FIG. The figure is displayed by forming a raster AO at the right end of the screen and sequentially moving the scanning position to the left side of the cylinder to display rasters A2 to An. ), 23rd r.
l! J is a block diagram showing an example of a device that performs such a display, l is a processing device that processes digital signals, 2 is an H counter for specifying the horizontal scanning position of the cathode ray tube, and 3 is a vertical scanning position of the cathode ray tube. A V counter for specifying the scanning position in the direction, and 4 a map section in which the read address order of the character generator is stored. 5 is a character generator in which graphic data representing a graphic is stored; 6 is a shift register; 7 is a CRT; H counter 2 and V counter 3 are read signal generators that generate read signals expressed in orthogonal coordinates; It consists of In the SIT configured in this way, the signals stored in the map 4 are sequentially read out by the output signals of the H counter 2 and V counter 3 controlled by the processing device 1, and a figure corresponding to the read signals is displayed. A signal is read out from the character generator 5, and if the character generator 5 stores the character A, for example, as shown in FIG. This data is then sequentially converted into video signals as shown in FIGS. 25(b) to (f), and characters are displayed on the cathode ray tube 7 as shown in FIG. 25(&). In this way, the data stored in the character generator 5 is read out and displayed on the cathode ray tube.
By providing a plurality of character generators, it is possible to display figures of arbitrary shape and size. At this time,
By shifting the reading start position of the character generator storage data in the horizontal or vertical direction, the displayed double opening can also be shifted in the water direction or vertical direction. In addition, as shown in Fig. 2, the readout signal represented by the X-axis and the orthogonal coordinates having seven wheels is transformed by rotating the square claw 0 as shown by the dotted line, and the new signal represented by the X-axis and the y-axis is converted. By converting the data into orthogonal coordinates, and reading out the graphic data from the character generator and displaying it using the readout signal represented by the new orthogonal coordinates, it is possible to give rotation to the displayed graphic. [Problems to be solved by the invention] However, since coordinate transformation is performed by trigonometric function calculations, the value of tangent exceeds 1 when the rotation angle exceeds 45 degrees, and as the angle approaches 90 degrees, the value sharply increases. However, in order to perform such calculations, a device with a large processing capacity is required. If the equipment is large and expensive,
The ratio of the price of the processing device to the price of the entire device is small, so using a device with a large processing capacity is not a problem, but if the price of the entire device is small, it is not a problem to use a processing device with a large processing capacity. This had the disadvantage of being extremely uneconomical. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a graphic display method that allows a highly economical display device in which the rotation angle of a graphic can be arbitrarily set. [F step 1 for solving the problem To achieve such an object, the present invention provides a method for exchanging coordinate axes and changing the coordinate axes according to the rotation angle and rotation direction of a figure when representing a readout signal in orthogonal coordinates] The data change direction of the readout signal is switched between the two, and the data necessary for graphic display is read out from the memory corresponding to the combination of coordinate axes. Hereinafter, this Ig1 will be explained in detail using drawings showing examples. [Operation] The rotation angle # of the figure can be controlled arbitrarily. [Embodiment] FIG. 1 is a blow diagram showing an embodiment of the present invention, and the same parts as in the jfi23 diagram are designated by the same symbols. 10
is the readout signal expressed in Cartesian coordinates. V counter that generates a signal specifying one coordinate axis, 1
1 is an H counter that generates a signal specifying the other coordinate axis; 12 is a coordinate rotation processing unit that performs rotation in the coordinate system of the readout signal; and 13 is a map that generates a signal for reading out the contents stored in the map unit 4. A readout signal generation section, 14 is a character generator readout signal generation section that generates a signal for reading graphic data from the character generator section, 15 is a character generator section, and 16 is a figure that assembles the data read from the character generator section 15 into a figure. This is the assembly department. Here, giving rotation to the coordinate axes means that the output signal of the V counter 10 corresponds to the coordinate axis in the X direction, and the output signal of the H counter 11 corresponds to the coordinate axis in the Y direction, as shown in FIG. The orthogonal coordinates are tilted by an angle of 0 as shown by the dotted line, and converted into a new orthogonal dust Ia represented by the X axis -y+Ih. When the display content is determined by sequentially reading data representing figures or characters to be displayed from the video RAM, such as a video RAM in a graphic display, in this invention, the video RAM corresponds to the video RAM. It is called memory. The apparatus shown in FIG. 1 reads data from the character generator section 15 based on the information L)K obtained by accessing the map section 4, and displays figures or characters based on the data. Therefore, the map section 4 and the character generator section 15 constitute a memory, and the memory in this device is as shown in FIG. Figure 3 consists of four frames, each frame representing one screen of a cathode ray tube, and the size of one frame representing one screen of a cathode ray tube.
The part indicated by the symbol A of 1Al is defined as the absolute origin, the direction of access to the left or downward from the absolute origin is defined as the positive direction, the lateral direction of the memory is defined as the horizontal direction, and the vertical direction is defined as the vertical direction. Also,
The right shoulder of the display screen of the cathode ray tube, indicated by symbol B, is defined as the origin of the cathode ray tube. As shown in FIG. 4, the water device includes a V counter 10 and an H
Depending on whether the output signal of counter ti is used for vertical or horizontal access of the memory,
The display state is defined as follows. (a) Display state A (state shown in Fig. 4 (a)) V counter 1
The output signal of 0 is used for horizontal access of the memory, and the H
Using the output signal of the counter it for vertical access,
The access position in the horizontal direction advances in the negative (right) direction of the memory as time passes, and the access position in the non-orthogonal direction advances in the negative (1-) direction of the memory. (b) Display state B (state of Fig. 4 (b)) V counter l
The output signal of O is stored as f! Used for direct access,
The output signal of the H counter 11 is used for access in the horizontal Y direction, and as time passes, the access position in the vertical direction changes to the negative (upward) direction of the memory, and the access position in the horizontal Y direction changes to the memory TF ( left) that moves in the direction. (c) Display state C (state S in Fig. 4 (c)) V counter l
The output signal of O is used for horizontal access of the memory, and the output signal of H
The output signal of the counter 11 is used for access in six orthogonal directions,
The access position in the horizontal direction advances in the positive (left) direction of the memory as time passes, and the access position in the forward direction advances in the negative (down) direction of the memory. (d) Display form flD (Fig. 4) State (d)) The output signal of the V counter lO is used for memory @direction access, and the H
The output signal of the counter 11 is used for access in the water 'l' Jf direction, and the access position l in the vertical direction advances in the positive (downward) direction of the memory as time passes, and the access position in the tree 'lL direction changes to the memory. One that moves in the negative (right) direction.
11 signal is displayed F! When iA represents display state B, a down count is performed, and when it represents display states C and D, y'/count is performed. The H counter 11 counts up when the display state signal supplied from the processing device 1 represents display states B and C, and counts down when the display state signal represents display states A and D. ing. The coordinate rotation processing 1i1112 is executed by the V counter 10. In addition to the readout signal represented by the i1 orthogonal coordinate supplied from the H counter 11, a display state signal 9 rotation amount signal, an origin signal representing the cathode ray tube origin in absolute coordinates, and a ■ signal. v4 signal, H signal, H4 signal, CHG@AD (V) signal, CHG-AD (H)! No., CHG @NO signal sound is generated. - The map read signal generating section 13 generates a V4L signal and an H4 signal to be supplied to the character generator read signal generating section 14 in addition to a signal for reading out the contents stored in the map section 4. As shown in the ER5 diagram, the coordinate rotation processing fll12 includes a component origin register 12b, a vertical component origin register 12C, a selector 12d, a selector l2'e, and a rotation signal calculation N.
It consists of 812f, 12g, and adders 12h to 12k. The component origin register 12b is configured to generate a signal 5) representing a lateral component of the cathode ray tube origin coordinate with respect to the absolute origin in response to an origin signal supplied from the processing device w1. Further, the vertical component origin register 12c generates a signal representing the vertical component. The selector 12d is the location J11! When the display state signal from the device 1 indicates display states A and C, the signal supplied from the component origin register 12b is output, and the display state B,
When representing D, the signal V) supplied from the wl component origin register 12c is output. The selector 12e selects Process! When the display status signal from all indicates the display status pJ3A, C, the signal supplied from the vertical component origin register 12c is output, and the display status 7gB is output.
, o, the 0 rotation signal calculation units 12f and 12g output the signal supplied from the component origin register 12b, in response to the signal representing the rotation amount supplied from the processing device l. V counter 10. It is designed to give rotation to the signal supplied from the H counter 11. Performing an affine transformation. The addition 'ki-12i is a 5-bit ■ signal representing the position on one coordinate of the map section 4, and the vertical direction dust IIM! of the character generator. 2 bits representing the position on III f)
The CHG-AD (V) signal and the 2-bit CHG-N08 signal to be supplied to the graphic assembly section 16 are generated. The adder 12 receives a 5-bit H signal representing the position on the other coordinate axis of the map 4, and a 2-bit CHG-AD signal representing the position on the horizontal coordinate axis of the character generator.
(H) M number, 2 bits M- representing master timing
It is designed to generate a T signal. Of these, the lower 1 bit of the ■ signal and the lower l bit of the H signal are used as the H4 signal and v4 signal necessary for the operation of the character generator read signal generation section 14. :FI6 As shown in the figure, the latch 13a, complementary 1F data generator 13b, addition'
J413c, selector 13d-13i, EOR circuit 1
It is composed of 3j. Supplementary data generation WL3b indicates the direction of the rotational force supplied from the processing device 1 (upper left and right t)
The signals shown in Table 1 are generated in response to the display state signal - representing the display state. :jS1 Table In Table 1, "left" means to display a figure by rotating it to the left, and "to the right" means to display a figure by rotating it to the right. Selectors 13d to 13g output a signal on the input terminal a side when the display status signal represents display status $A or C, and output a signal on the input terminal A side when the display status signal 1 represents display status B or D. It is designed to output a signal. Selector 1
3h, the selector 131 selects the input terminal f'a1.3h depending on the time supplied from the EOR circuit 13j. The signal on the az side or the input terminals bl and bz side is output. As shown in FIG. 4b, latch 4c, and 4d, and this map is composed of 16X of the cathode ray tube as shown in Fig.
l (The part corresponding to i pixel is one unit, and these 32 x 32 units are collected to form map 4a or map 4b. Also, when l medium map is specified, the part corresponding to this map The information in the map is read out no matter which pixel in the 16x16 is scanned. That is, when access is being made as shown by the solid line in Figure 8. Pixel l Data F is read out from the portion corresponding to the pixel 11 to the portion corresponding to the pixel 11. The character generator read signal generating section 14 includes selectors 14a to 14f and a switch circuit 14 as shown in FIG.
g, 14j, latch 14h, shift register 14i
, 14, EOR circuit 14 m. 14n. Selectors 14a to 14f
Input terminal a or input terminal A is selected depending on the signal supplied to input terminal C. The switch circuits 14g and 14j have output terminals g- for outputting the signals supplied to the input terminals a-d and the signals according to the left and right signals or display state signals supplied to the input terminals e and f.
The combination with j is reverse twisted to either mode l or mode 2 in Table 2. Mode l
Whether "N" or "r mode 2" is selected is determined by the criteria in Table 3. shift register 1
4i is a 1-bit four-stage shift register, and the shift register 14 is a 2-bit four-stage shift register. Table 2 Table 3 1-1 - The character generator section 15 is composed of character generators 15a to 15d, as shown in No. 10, and each character generator is connected to the V
The graphic patterns of type 2g such as the shape and the H shape are selected according to the display status %l supplied from the processing device l, and also according to the signal supplied from the character generator readout signal generation section 14. , graphic data is read out from the selected graphic pattern. Figure 11 shows the character generator patterns.
It shows a V-shaped pattern, with horizontal numbers 00 outside the frame.
~11 is the CIIG-AD (
H) is the address specified by the signal, and the vertical number is the C HG -AD (V) output from the adder 12i.
It is 7 dos 1/s specified by the signal. Inside one frame is a-
The data of these parts a to d corresponds to the character cinerators 15a to 15d, respectively, and the data of these parts is 1 pixel in the horizontal force direction of the cathode ray tube x 4 pixels in the vertical direction. remembered. That is, a frame designated by one address in each direction stores data for 4×4 pixels. and,
One storage unit of the character generator is 4×4 addresses, that is, 16×16 pixels. As shown in FIG. 12, the figure assembly section 16 includes shift registers 16a to 16d, a selector lee,
It has been aE& from 6f. Each shift register outputs the MSB (most significant bit) first when the display state signal supplied from the processing device I is in the magnitude state A or B, and when the display state signal is in the display state C or D, the LSB (f & lower bits) are brought out first. Selector 16e
selects and sends out input signals as shown in Table 4 in accordance with the signals supplied from the shift register 16f. The shift register 16f in Table 4 is a 2-bit, 8-stage shift register. The operation of the device configured in this manner is as follows. First, a display operation when a figure is not rotated will be explained. At this time, as shown in FIG. 5, the display S signal is supplied from the processing device 1 to the V counter 10 and the H counter 11, and the origin signal is supplied to the component origin register 12b and the vertical component origin register 12c. . At this time, the screen is scanned as shown in Figure 22, and this state corresponds to display state C, and the horizontal position of the screen in Figure 22 is determined by the output signal of the V counter lO. The vertical position is determined by the output signal of the H counter ti. The output signal of the H counter 11 is supplied to the adder 12 and the rotation signal rA calculation section 12g, but in this case, since no rotation is given to the figure, the rotation signal calculation section 12f and the rotation signal calculation section 12g are No output signal is generated. The display status signal output from the processing device at is the display status f.
When fJ (represents
And the signal generated from the vertical component origin register 12c is selected and output. As a result, the signal output from the adder 12h is the sum of the output signal of the V counter IO and the output signal of the component origin register 12b. Since the one-rotation signal calculation unit 12g does not generate an output signal, the adder 12i outputs the output signal of the adder 121N as it is. Similarly, adder 12j
outputs the output signal of the vertical component origin register 12c, and the adder 12 receives the output signal of the adder 12j, that is, the vertical component origin register 12. A signal obtained by adding the output signal t) of c) and the data of counter 11 is output. Addition g l 2 i and adder 12. As shown in FIG. 6, the output signal of
Supplied in 3g. The correction data generator 13b normally does not need to generate an output signal when there is no need to rotate the figure, but since no special measures are taken for this purpose, correction data is generated. Then, since this data is added by the adder 13c, corrected data is output from the adder 13c. However, since this data is unnecessary when the figure is not rotated, it is ignored and not used by the generator read signal generating section 14, which will be described later. As described above, the selectors 13d to 13g output the signal on the long terminal a side in the display state C, so they output the output signal of the selector 13d, selector 13ej, power O calculator 13c, and selector 1'3f. , selector 13g outputs an output signal to adder 12. As mentioned above, the selector 13h and the selector 13i are
Input terminal a according to the signal supplied from OR circuit 13j
1. The signal supplied to a2, bl, and b2 is output. The V4L signal supplied to one side of the EOR circuit 13j is raster AO" at the 22nd v4.
During the period shown in FIG. 13(a) which displays one line of An, the H4@ signal that does not change but is supplied to the other one is shown in FIG.
n'fi4, it changes alternately to 2 during the period of the V4L signal, as shown in 1311(b). Therefore, the output signals of the selectors 13h and 13i are switched between the input terminals -f-al and a2 and the bl and b2 sides. The output signals of the selectors 13h and 13i are supplied to maps f1 & 4 as shown in FIG.
a, the memory contents are read from the map 4b, and the read memory contents are stored in the latch 4c and the Dutch 4 (1), and are supplied to the selectors 14a and 14b shown in FIG. t) and the V4L signal are supplied from the EOR circuit vlN14m, the input terminals a and b are switched in synchronization with the selectors 13h and 13i. The signals read from the selectors 14a and 14b are supplied to selectors 14c to 14f, respectively.
They are selected and output according to the signals supplied to terminals C of these selectors. At this time, the signals supplied to the terminals of the selectors 14c to 14f are data that has not been corrected by the correction data generator 13b of the map read signal generator 13, and the data supplied to the terminal a is the corrected data. It is. However, when the displayed figure is not rotated, the corrected data is not necessary. Therefore, the signal sent from the switch circuit 14g selects the terminals of the selectors 14C to 14f, and the signal supplied to the terminal a is ignored. A signal representing the number of the character generator supplied from the adder 12i is stored in the shift register 1'4k, and the stored signal is supplied to the switch circuit 14j. When the switch circuit 14j does not rotate the displayed figure, it is in the mode 1 of Table 2 mentioned above. Signals are sent out from opposing output terminals. The signal generated by the character generator read signal generating section 14 is supplied to the character generator 15a to character generator 15d, as shown in the gSIO diagram. As described above, each character generator selects <turn of V-shaped or H-shaped, which will be described later, in accordance with the display status signal supplied from the processing device 1. Since the processing device i is sending out a signal in the display state C when the display state C is not displayed, the v shadow pattern is selected. As mentioned above, the middle part of the pattern of v +t* read out by the map unit 4 is as shown in FIG. 11, and in this example, it represents the part where the figure representing the letter F is stored. ing. In Figure 11, the address written horizontally outside the frame is the adder 1 in Figure 4.
The address specified by the CIIG-AD(V) signal output from 2i and written in the vertical direction is C0G-AD(H) output from adder 12k in FIG. The problem is debilitating. Therefore, adder 12i, adder 1
11th by the V signal and H signal supplied from 2k.
Sixteen types of blocks indicated as I-XVI in the figure can be specified. This I-XVI block has four more details! /1 block, and its fine blocks t± correspond to each character generator. That is, a,
Portions t marked b, C+d correspond to character generator t5a, character generator 15b, character generator 15c, and character generator 15d, respectively. 4-bit data is stored in the vertical direction of each character generator 11 in the diagram, and the hatched area in the diagram stores the data for the eyes, and the other parts store rOJ data.
Ru. Therefore, the CHG-DAD (V) signal and the C
When the data of the MG-AD(H) signals are both 00,
Four small l and % blocks labeled I on the right side of FIG. 1 are selected, and the character generator 15a to
ooou, character generator 15b to 1000
0J, from character generator 15c [)OIIJ
, data of rollJ is read from the character generator 15C1. Data read from these character generators is supplied to and stored in shift registers 16a to 16d. When displaying the first raster, selector 16e is selected from shift register 16e in FIG.
A signal for selecting the shift register 16a is supplied to the shift register 16a. As a result, only the data in the shift register 16a, that is, the data read from the key/lag generator 15a, is selected, and the remaining shift registers 16b to 16b are selected.
16d data is discarded. At this time, the shift registers 16a and 16f are synchronized with the timing L±. Next, CIIG@AD(H)! When the data of the number becomes ot, the block (2) in FIG. 11 is selected, and the data read from the character generator 151 is also selected from therein. Similarly, CIIG-
AD (H) signal data value <lOl

[When it changes to 1, the block ■ in Figure 11. ■ is selected, and the character generator 1 for that part is selected.
Only data read from 5a is selected. After the data in the bold line part in FIG. The raster AO shown in FIG. 22 is formed. After the raster AO is formed, adjacent rasters are sequentially formed in the same manner, and the last raster An shown in FIG. 22 is formed, thereby forming one display screen. That is, a V-shaped pattern is specified by the process 'Jc and t, and a cluster of 16 blocks of I-XVI as shown in FIG. 11 is selected by the character generator read signal generation i14, and CHG -AD (H) Signal and C
HG@AD (V) One block is selected from among the blocks of the signal I-XVI, and as a result, data of 4 bits i1 is read from each of the character generators 15a to 15d. The CIIG-AD (V) signal changes every raster (7) one round trip, but the CHG-AD (H) signal changes as the scanning progresses.
When the G-AD (V) signal is 00 ・CIIG @AD
(H) The rightmost block ■ changes as the signal changes to oo, ot, to, and il. Data is sequentially read from II, nN, and ff. The data read from the -1 tractor generator 15a to character generator 15d is supplied to and stored in the small shift register lea to shift register 16d as shown in FIG. Then, in response to the signal supplied from the shift register 16f, the selector 16e selects the signal (-) supplied to the terminals ad, and sends it to the cathode ray tube 7 for display. By sequentially performing scanning in this manner, a signal representing a figure read out from the character generator section 15 is displayed on the screen. At this time, by changing the origin' data, the display screen can be moved horizontally or vertically. Next, the operation when rotating a figure will be explained. In addition to the operation described as not applying rotation to the figure, the fifth coordinate rotation processing unit 12 performs rotation signal calculation on the signals supplied to the terminals a of the adders 12i and 12j. fs12f and rotation signal calculation unit 12
Therefore, the signal representing the orthogonal coordinates output from the coordinate rotation processing section 12 is input to the rotation signal operation section 12f and the rotation signal operation section 12f.
The coordinate system is rotated by an angle corresponding to the output signal supplied from the ai91112g, as shown by the dotted line in FIG. In this way, because the coordinate system has been rotated, even if the output signals of the V counter 1O and H counter 11 are the same as when no rotation is applied to the figure, the memory may be accessed at a different location. will be done. Now, in the memory space shown by the rectangle in the :tSlA diagram, the position in the # direction is fixed at the V address (the coordinate specified by the V counter lO is defined as the V address),
When the vertical position is expressed by the orthogonal coordinates specified by the H address (the coordinate specified by the H counter 11 is defined as the H address), no roll is given to the storage system, the V counter 10 is When the value is fixed and the value of the H counter 11 is changed, access is performed in the direction indicated by the protruding ring of symbol A. However, when rotation is given to the coordinate system, access is performed in the direction indicated by the dotted line of symbol B. In other words, when the coordinate system is rotated, the sled space is accessed diagonally. The map section 4, from which data is read by a signal supplied from the map read signal generator q13, stores unique display contents for each area surrounded by 16 pixels in the vertical and horizontal directions of the cathode ray tube 7. For example, this map part 4 has data as shown in FIG. 8, that is, when the part surrounded by the 2@ line in the center is accessed, data representing the letter F is read out, and the part to the right of it is accessed. When the data representing the character B is accessed, the data representing the character B is read, and when the left neighbor is accessed, the data representing the character C is read.
When the data representing t- is read out and the coordinate rotation processing unit 12 rotates the coordinate system in the right direction, the map unit 4 is accessed as shown by the solid line in FIG. Therefore, the data for displaying the character F is read for the 14th to ll# pixels, but the 12th to 1st
Data for displaying the character C is read from the sixth to sixth pixels. On the other hand, the display timing signal is 16
Since it is generated for each pixel, it occurs every time the horizontal 2fi line in FIG. 8 is crossed. As a result, when the coordinate system is rotated clockwise and the map is accessed in the direction of the solid line arrow in Figure 8, the 1g display timing signal is 2N to display the letters F and C during the 1g1 period.
kind of data is required. In this way, when the coordinate system is rotated to the right, it is necessary to read not only the stored content of the currently accessed part during one display timing signal period, but also the stored content of the adjacent part to the left. Furthermore, when the coordinate system is rotated to the left and accessed in the direction of the arrow shown by the dashed line in the 8th Ui4, in addition to the memory contents of the part being accessed,
It is also necessary to read out the memory contents of the part to the right. Therefore,
The memory contents of the part being accessed are [Nara 1. The memory content of the part to the left is defined as "next 1," and the memory content of the part to the right is defined as "rback 1." The supplementary 1F data generator 13b in FIG. 6 is provided for this purpose. The first
For example, in 1 display state C, when the figure is rotated to the left, that is, when the coordinate system is rotated to the right, 1 is added to the signal supplied from the latch 13a. When a figure is rotated to the left, l is subtracted.In the 0 display state C, the signal supplied from the V counter 11 and stored in the latch 13a indicates the horizontal position of the map. I agree. Therefore, the 5-bit signal supplied from the latch 13a identifies the horizontal position of the 8th rJ4, that is, the characters C, F, and H, and the 5-bit signal supplied from the latch 13a identifies the character F. If you were accessing , adding 1 to it would specify the position to the left, so
represents accessing the character C, and subtracting l represents accessing the character B, resulting in addition 1! The signal at terminal a at the input end of l3c is the memory content of the part currently being accessed, that is, the signal at rnara1, but the signal at terminal C at the output side depends on the signal supplied from processing device l. Then, the signal from the correction data generator 13b is added to represent the signal from the r next] or the back A. As mentioned above, the V signal output from the adder 12i is added to the signal from the correction data generator 13b. This is a signal that specifies the horizontal position of the map at a certain point in time, and correction by the correction data generator 13b is performed on the signal supplied from the latch 13a to the adder 13c.Therefore, rotation is applied to one figure. For example, when an access is performed as shown by the solid line in FIG. 8, the contents of the V signal', that is, the output signal of the adder 12i, change during the access. During this period, a latch 13a is provided to fix the data so that the contents of the V signal supplied to the adder 13c do not change even if the output signal of the adder 12i changes.Selector 14a in FIG. , the selector 14b is rotated to the latch 13a and the correction data generator 13b in FIG.
s has been changed, the selector 14a is outputting a -next or r-back 1 signal, and the selector 14b is outputting an r-nara 1 signal. On the other hand, in the 1-display state 7sC, the horizontal selection of each storage content in FIG. 8 is performed by the V signal, and the selection of the vertical storage content is performed by the H signal.
Since this is done using a signal, if the access shown by the solid line arrow in Figure 8 is performed, the H4 signal does not change the data content when accessing from the 1st pixel to the 16th pixel. , v4 signal is 12th 11th
The content of the data changes when accessing the pixel. Therefore, the output signal of the EOR circuit 14n changes after this point. This change changes the displayed screen to 1NEXT1! /
1. It is determined that it is necessary to replace it. The information determined by the FOR circuit 14n is transferred to the shift register 1.
4i and stored in latch 14h. and,
process? An output signal controlled in mode 1 or mode 2 as shown in Table 2 is sent from the switch circuit 14g according to the left and right signals and the display state signal supplied from till, and which selector among the selectors 14c to 14f is selected as "Nara 1". % data and which selector selects the "next" data is determined. The data read out from the character generator 115 by the signal supplied from the character generator read signal generation section 14 is assembled into a figure by the figure assembly section 16.
The signal is supplied to a cathode ray tube 7 and displayed. In this case, when no rotation is given to the coordinate system, Fig. 15 (a
), when a triangular figure is displayed on the screen, when the memory is accessed as shown by the solid arrow in Figure 15(b), the displayed figure is rotated to the left as shown in Figure 15(b). displayed as a shape. Furthermore, when the memory is accessed as shown by the dashed line in FIG. 8, the displayed figure is displayed as a figure rotated to the right as shown in FIG. 15(e). : TS20 is a diagram for explaining the display state when the character F is stored in the character generator and the character generator is accessed using the orthogonal coordinates shown by the thick line with rotation 4j-. In the same figure, since the data of the character F is stored in the same way as in FIG. 11, 00 of CHG@NO is stored in the character generator 15.
a, 01 corresponds to the character generator 15b, lG corresponds to the character generator 15c, and 11 corresponds to the character generator 15d. Data read from the character generators is simultaneously read from four character generators and stored in shift registers tSa-16d. For the first time in kk, access from the l#th pixel to the 16th pixel,
The shift register 16f is supplied with the data of O1 of the C1 line G-No to the selector 16eK, and the shift register 16C storing the data of the character generator 15C is selected. A mask timing signal is supplied to this shift register 16c, and data corresponding to the 1st pixel and data corresponding to the 2#th pixel are successively read out. At this time, since the mask timing signal is also supplied to other shift registers, data corresponding to the pixels represented by symbols B, C, 口, and C are also read out, but these data are not available at the current timing. Selector 1
Since it is not selected by 6e, it is not output. Furthermore, the data read from shift register lee at this timing is not the character F but a blank part, so lr O,
It is l. Next, data rl-- IJ is supplied from the shift register 16f to the selector 16e in order to read data necessary for pixel No. 3 [1] from the shift register 16d storing the data of the character generator 15d. Then, data necessary for the third and ninth pixels is read out from the shift register 16d at the third bit of the mask timing. Since this data is for displaying the character F, it is "11." Similarly, data r11 corresponding to the fourth pixel is read out, but this data is changed from CHG-ADtV). Therefore, the read data is from the character generator corresponding to the CHG-AD(V) signal. Accesses are made one after another in the same manner. When the first access is completed, the symbol A- Column P is accessed, and columns A to A and a to P are sequentially accessed. As a result, as shown in the shaded area in Figure 21, a figure in which the letter F is rotated is created. This device displays CHG-AD (V) and CIIG-AD (H).
Since the character generators specified by and are read at the same time and the necessary data is used from there, the memory read speed is one-fourth that of a single memory configuration, which simplifies the device. It can be configured economically. Further, in the example of FIG. 20, a signal is supplied from the shift register 16f so that character generators 15c, 15d, 15a, and 15b are selected in order, but this signal corresponds to the position of the character generator where access is started. The data is rearranged according to the access order. Memory access is performed in the direction shown by the dotted line in Figure 8 when there is no need to rotate the displayed figure, but rotation! When it is necessary to tow, this access direction is arbitrarily controlled by a rotation amount signal supplied from the processing device 1. This control is performed so that, as shown in FIG. 16, the pixel to be scanned next to the pixel currently being scanned is a pixel adjacent to the pixel currently being scanned. Therefore, the pixel to be scanned next to pixel PI is either Pi-P3, and the access direction is limited to a maximum of 45 degrees. As a result, when accesses are made in directions that differ by plus and minus 45 degrees, the figure displayed as the solid line in Figure 17 when no rotation is applied will change from the position of the one chain line in Figure 17 to the position of the dotted line. It will rotate within the range. However, as it is, it is not possible to rotate the displayed figure more than 45 degrees, but the lateral access to the memory is generated by the addition m12k based on the H counter 11 (this signal is referred to as the H access signal). li, 'defined), and the memory is accessed in the vertical direction by a signal generated from the adder 121 based on the V counter lO (this signal is defined as the V access signal t).
The figure that was displayed as shown in Figure 17 has been changed to Figure 18 (
It is displayed as shown in b). As a result, Figure 18 (b
) is the figure shown by the solid line in FIG. 17 rotated 135 degrees to the right. −
In FIG. 17, ■Access signal and II7
When the changing directions of the access signals are reversed, the displayed figure becomes as shown in FIG. 18(a). 18th
In Figure (a), the figure shown by the dashed line is the figure shown by the solid line in Fig. 17 rotated 225 degrees to the right. In Fig. 18(a), if the ■access signal and H access signal are exchanged, the displayed figure changes to Fig. 18(a).
d). In Fig. 18(d), the figure indicated by the dashed line is 31 times the figure indicated by the solid line in Fig. 17.
This means that it has been rotated 5 degrees to the right. Then, in Figure 18(d), if the V access signal and H access signal are swapped and the data change direction of the access signal is reversed, the displayed figure will become as shown in Figure 18(C). . Figure 18 (C) shows the figure shown in Figure 17 at 36
This means that it has been rotated 0 degrees to the right. That is, by selecting the method of receiving the access signal and the H access signal and the direction in which the data changes, the figure can be rotated to any angle and displayed. The display state of FIG. 18 corresponds to the display state of the m3 diagram, and the display state of figures in the above-mentioned display states A, B, C, and D is (, a) in FIG. (b), (c), and (d), where. Figure 18(a), (c), Figure 18(b),
Cd), the V access signal and the H access signal are switched. In order to perform such exchange of access signals, selectors 13d to 13g shown in FIG. 6 are provided. The above explanation of applying rotation lj to the figure is based on the state in display state C, so the pattern of the character generator used is as shown in Fig. 11, with the horizontal position being CHG-AD (V ) signal, and the vertical position is CHG・AD (0 display state iA that used a V-shaped pattern represented by the (1) signal
In t), only the direction of change of the outgoing signal changes, but the combination of signals itself does not change, so the V-shaped pattern shown in Figure J11 can be used. but. In display states B and D, the horizontal direction is an H access signal,
Since the vertical car 1 is a V access signal, if you try to display the same figure as shown in Fig. 11 on the screen, the 19th
It is necessary to use an H-shaped pattern obtained by rotating the V-shaped pattern by 90 degrees as shown in the figure. Therefore, the character generator 15 a −' 1 ! i d selects a V-shaped pattern and an H-shaped pattern on the right 17 according to a display state rotation signal supplied from the processing device 1 . Note that the processing device 1 generates a display state signal, an origin signal, a rotation amount signal, and a left/right direction signal, but these signals may be controlled manually by the operator. The rotation angle may be generated by software control, and although the maximum rotation angle is 45 degrees, it may be less than that.Also, the memory configured for the map and character generator may be RAM, so even if it is a graphic display, it will be extremely fast. You can rotate and display figures. Also,
How to give continuous rotation to the displayed figure 8! IJ! rotation amount signal generated from the equipment fit! It can be changed continuously. 1. Effects of the Invention] As described in 1-1 above, in this invention, the coordinate axes of the readout/transmission screen are interchanged according to the display state, so that the processing chamber ri
Even if one small processing device is used, the rotation angle of the displayed figure can be arbitrarily controlled, resulting in improved economic efficiency.

[Brief explanation of drawings]

FIG. 1 is a blow diagram showing an embodiment of the present invention, FIG. 2 is a graph for explaining rotation of coordinates, FIG. 3 is a diagram for explaining the relationship between memory and display area, and FIG. 4
FIG. 5 is a small block diagram of the HI network of the coordinate rotation processing section 12 in FIG. 1, and FIG. 6 shows details of the map readout signal generation section 13 in FIG. 1. The block diagram shown in FIG. 7 is the map section 4 in FIG.
FIG. 8 is a detailed block diagram showing the stored contents of the map and the access direction. FIG. The figure shows block 1Δ showing the details of the character generator section 15 in FIG. 1, FIG. 11 shows the V-shaped pattern stored in the character generator, and FIG. 13 is a diagram showing the relationship between the V signal and the H signal, FIG. 14 is a diagram showing the memory access direction,
FIG. 15 is a diagram showing the state displayed when the display figure is rotated, FIG. 16 is a diagram showing the pixel scanning direction,
FIG. 17 is a diagram showing the rotation range of the display figure in display state C, FIG. 18 is a diagram showing the display state when the same figure is rotated in four display states HA, n, c, and D. The figure shows the H-shaped pattern stored in the character generator, the @20 figure shows the character generator being accessed to explain the rotation of the figure, and the ff121 figure shows the actual display state of the figure. diagram showing,
Fig. 22 is a diagram for explaining raster, Fig. 23 is a block diagram showing the configuration of the conventional device, Fig. 24 is a block diagram for explaining the memory contents of the character generator, and Fig. 25 is the same as Fig. 24. This is a timing team that indicates the state in which the read signal is displayed. f (Researcher Masatsuna Yamakawa (and 2 others) !R2 Figure ■ Figure 4 V -H Figure 19 Figure 22 Figure 24 Figure 25

Claims (2)

[Claims] (1) In a graphic display method that reads data by supplying a read signal expressed in coordinates different from the coordinates of this memory to a memory that stores data necessary for graphic display, and then displays the read data, there are two independent A graphic display method comprising: configuring a readout signal with signals represented by coordinate axes, and swapping the coordinate axes of the readout signal and the direction of data change of the readout signal on the coordinate axes depending on the display state. (2) In a graphic display method that reads data by supplying a read signal expressed in coordinates different from the coordinates of this memory to a memory that stores data necessary for graphic display, and displays the read data, two independent The read signal is composed of signals expressed by the coordinate axes, and the coordinate axes of the read signal are swapped and the direction of data change of the read signal on the coordinate axes of the read signal is swapped depending on the display state, and the data necessary for graphical display is A figure display method characterized by reading out from a memory corresponding to a combination of coordinate axes.