JPS6184681A - Graphic display method and apparatus - 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] The present invention is for displaying graphics by a raster scan method based on data read from a memory storing data necessary for displaying graphics.

The present invention relates to a graphic display method and a graphic display device.

[Prior Art] Conventionally, in order to display characters or figures by digital signal processing, a figure display device has been used which displays data read from a character generator as figures by a raster scan method. This display starts with raster A at the right end of one screen, as shown in Figure 22.
The figure is displayed by forming rasters A2 to An and sequentially moving the scanning position to the left side of the screen to display rasters A2 to An (this figure uses a common cathode ray tube rotated 90 degrees). FIG. 23 is a block diagram showing an example of a device that performs such a display, in which 1 is a processing device for processing digital signals, 2 is an H counter for specifying the horizontal scanning position of the cathode ray tube, and 3 is a cathode ray tube. V counter for specifying the vertical scanning position, 4 is a character.

A map section in which read address order data specifying the read address order of the generator is stored, 5 is a character generator, 6 is a shift register, 7 is a CRT, and H counter 2 and V counter 3 are represented by orthogonal coordinates. It constitutes a read signal generator that generates a read signal. The map section 4 and the character generator 5 constitute a memory for displaying figures corresponding to a video RAM in a graphic display.

In the device configured as described above, a read signal is generated based on the output signals of the H counter 2 and V counter 3 controlled by the processing device 1, and the read address order data stored in the map 4 is read by this read signal. The data is read out sequentially for each display section, and graphic data representing a graphic is read out from the character generator 5 based on the read address order data. For example, the character generator 5 reads 'js'. As shown in FIG. This data is then sequentially converted into a video signal as shown in FIGS. 25(b) to 25(f).
The character A is displayed on the cathode ray tube 7 as shown in FIG. 25(L).

In this way, the data stored in the character generator 5 is read out and displayed on the cathode ray tube.
- If multiple character generators are provided, 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 screen can also be shifted horizontally or vertically.

In addition, as shown in FIG. 2, the readout signal represented by the orthogonal coordinates having the x-a-y axes is rotated by an angle θ as shown by the dotted line, resulting in a new orthogonal coordinate represented by the By converting the data into coordinates and reading out the data from the character generator and displaying it using the readout signal represented by the orthogonal coordinates, it is possible to give rotation to one displayed figure.

[Problems to be solved by the invention] A part of the memory for displaying figures is
In the case of one display section, the change timing of the readout signal is determined so that it changes for each display section, that is, every time the horizontal double line in FIG. 8 is crossed. When the coordinate conversion is performed, the coordinate axis of the readout signal is tilted as shown by the solid line in Figure US8, so the division between the section for displaying the letter F surrounded by double lines and the section for displaying the letter C adjacent to that section is You need to access both.

However, since the section representing the letter F and the section representing the letter C are different sections, the data of the read signal is different, but a change in the data of the read signal only occurs every time a horizontal double line is crossed. Therefore, even when the timing for displaying the character C is reached, the data of the readout signal does not change, resulting in a disadvantage that normal display cannot be performed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a graphic display method and a graphic display device that can display an iF normal display when a displayed graphic is rotated.

[Means for Solving the Problem] In order to achieve such an object, the present invention, when representing a readout signal in orthogonal coordinates, swaps the coordinate axes and performs readout on the coordinate axes according to the rotation angle and direction of the figure. The data change direction of the signal is exchanged, and the data necessary for graphic display is read from the memory corresponding to the combination of coordinate axes. Hereinafter, the present invention will be described in detail using drawings showing embodiments.

[Effect] Figures can be rotated and displayed correctly.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.
The same symbols are used for the same parts as in FIG. 23. 10 is a V counter that generates a signal specifying one coordinate axis of the read signal expressed in orthogonal coordinates, 11 is an H counter that generates a signal specifying the other coordinate axis, and 12 is a counter that rotates the coordinate system of the read signal. 1.3 is a map readout signal generation unit that generates a signal for reading the stored contents of the map unit 4; 14 is a character generator that generates a signal for reading graphic data from the character generator unit; A read signal generating section 1, 5 is a character generator section, and 16 is a figure assembling section for assembling data read from the character generator section 15 into a figure.・Here, giving rotation to the coordinate axes means that the output signal of the V counter 10 is made to correspond to the coordinate axis in the X direction, and the output signal of the H counter 11 is made to correspond to the coordinate axis in the Y direction, as shown in FIG. This involves inclining the orthogonal coordinates by an angle θ as shown by the dotted line, and converting them into new orthogonal coordinates represented by the X-y axis.

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, the present invention uses a memory corresponding to the video RAM. It is called.

The apparatus shown in FIG. 1 reads data from the character generator section 15 based on a signal 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 on a cathode ray tube, and one frame on the right side of the memory.
The part indicated by symbol A is the absolute origin, and the direction to the left or downward from the absolute origin is the positive direction.

The horizontal direction of the memory is defined as the horizontal direction, and the vertical direction is defined as the vertical direction. Also, the symbol B, which is the right hand side of the display screen of the cathode ray tube.
The part indicated by is defined as the origin of the CRT.

As shown in FIG. 4, this device has a v counter 10 and an H
Depending on whether the output signal of the counter 11 is used for vertical access or horizontal access to 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 11 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 vertical direction advances in the negative (up) direction of the memory.

(b) Display state B (state in FIG. 4(b)) V counter 1
The output signal of 0 is used for vertical access of the memory, and the output signal of H
Using the output signal of the counter 11 for horizontal access,
As time passes, the vertical access position advances in the negative (up) direction of the memory, and the force direction access position l
The position moves toward the left side of the memory.

(c) Display state; C (state shown in Figure 4 (c))' ■
The output signal of the counter 10 is used for accessing the memory in the horizontal direction, and the output signal of the H counter 11 is used for accessing the memory in the vertical direction, so that the access position in the horizontal direction advances in the positive (left) direction of the memory as time passes. , where the vertical access position advances in the negative (downward) direction of memory.

(d) Display state D (state shown in FIG. 4(d)) V counter 1
The output signal of 0 is used for accessing the memory in the vertical direction, the output signal of the H counter 11 is used for accessing in the water layer direction, and the access position in the vertical direction advances in the positive (downward) direction of the memory as time passes. The horizontal access position advances in the negative (right) direction of memory.

■The counter 10 counts down when the display status signal supplied from the processing bag 7.1 represents display status A9 and display status B, and counts up when it represents display status C and D. It has become.

The H counter it counts up when the display status signal supplied from the processing unit 1 represents display states B and C, and counts down when it represents display states A and D. ing.

The coordinate rotation processing section 12 uses a V counter 10. H counter 11
A readout signal expressed in orthogonal coordinates supplied from 1 rotation amount signal, an origin signal expressed in absolute coordinates of the origin of the cathode ray tube, and a ■ signal.

■4 signals, H signal, H4 signal, CHG -AD (V
) signal, CI (G-AD (H) signal, CHG-N
.

It is designed to generate a signal.

The map read signal generating section 13 generates a V4L signal and a H44@ 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 FIG. 5, the coordinate rotation processing unit 12 includes a component origin register 12b, a vertical component origin register 12C, and a selector 1.
2d, selector 12e, rotation signal calculation section 12f, 12
g, and adders 12h to 12k.

The component origin register 12b is adapted to generate a signal 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 1. Further, the vertical component origin register 12c is adapted to generate a signal representing a vertical component. When the display state signal from the processing device 1 indicates the display state A or C, the selector 12d outputs the signal supplied from the component origin register 12b, and selects the display state, t9 B, D.
, the signal supplied from the vertical component origin register 12c is output. Selector 12
In e, the display state signal from the processing device 1 is the display state 8A,
When displaying C, the signal supplied from the vertical component origin register 12c is output, and when display states B and D are indicated, the signal supplied from the component origin register 12b is output. Rotation signal calculation section 12f
, 12g is a processing bag;
It is designed to give rotation to the signal supplied from , and performs affine transformation.

The adder 12t receives a 5-bit V signal representing the position on one coordinate of the map section 4, and a 2-bit CHG signal AD (V) representing the position on the vertical coordinate axis of the character generator.
) signal, 2-bit CHG- signal supplied to the figure assembly section 16
It is designed to generate a No signal. The adder 12 receives a 5-bit H signal representing the position on the other coordinate axis of the map 4.
A 2-bit CHG/AD (H) signal representing the position on the horizontal coordinate axis of the character generator, and a 2-bit M/T signal representing the mask timing are generated. Of these, the lower 1 bit of the ■ signal and the lower 1 bit of the H signal are the H4 signal and V4 signal necessary for the operation of the character generator read signal generation section 14.
It is used as a signal.

As shown in FIG. 6, the map read signal generation section 13 is composed of a latch 13a, a correction data generator 13b, an adder 13c, selectors 13d-13i, and an EOR circuit 13j.
It is. The correction data generator 13b is designed to generate the signals shown in Table 1 in response to the left and right signals representing the rotation direction and the display state signal representing the display state supplied from the processing device 1.

Table 1 In Table 1, "left" means that the figure is rotated to the left and displayed, and "right" means that the figure is rotated and displayed to the right.

The selectors 13d to 13g output the signal on the input terminal a side when the display state signal represents the display states A and C, and output the signal on the input terminal A side when the display state signal represents the display state f4B and [). It is designed to output . The selector 13h and the selector 131 select the input terminals a1. The signal on the a2 side or the input terminal bl, b2 side is output.

The map portion 4 is a map 4a as shown in FIG.

4b, latches 4c, and 4d, and as shown in Fig. 8, one unit of this map corresponds to 16 x 16 pixels of the cathode ray tube, and these are 3
A collection of 2×32 units constitutes a map 4a or a map 4b. Furthermore, when the map at position 1r11 is specified, the information in that map is read out no matter which pixel of 16×16 corresponding to this map is scanned. That is, in FIG.
When the access shown by the solid line is performed, data F is read out from the portion corresponding to pixel 1 to the portion corresponding to 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 14m.

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-j that output 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.
Either mode 1 or mode 2 in Table 2 is selected for the combination. And T mode 1,
! Whether "Mode 2" or "Mode 2" is selected depends on 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 Table 3 The character generator section 15, as shown in No. 10,
It is composed of character generators 15a to 15d, and each character generator selects two types of graphic patterns, a ■ shape and an H shape, which will be described later, according to a display state signal supplied from a processing device 1. Character generator router read signal generator 1
Graphic data is read out from the selected graphic pattern in accordance with the signal supplied from 4.

1st it;! 3 indicates a V-shaped pattern among the character generator patterns, and horizontal numbers 00 to 11 outside the frame are C HG output from the adder 12h.
-AD (H) is the address specified by the signal, and the vertical number is the CHG-AD(
V) is the address specified by the signal. Inside one frame is a
-d, and the data of the &~d parts corresponds to the character cinerators 15a to 15d, respectively.
Data of pixels x 4 pixels in the vertical direction is stored. That is, a frame designated by one address in each direction stores data for 4×4 pixels. And one memory unit of the character generator is 4×4
This is for the address, that is, 16×16 pixels.

As shown in FIG. 12, the figure/shape assembly section 16 is composed of shift registers 16a to 16d, a selector 16e, and a shift register 16f. Each shift register outputs the MSB (most significant bit) first when the display status signal supplied from the processing device 1 is in the display status A or H, and outputs the LSB (least significant bit) when the display status signal is in the display status C or D. bits) are output first. Selector 16
e selects and sends out input signals as shown in Table 4 according to 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 apparatus thus constructed is as follows.

First, a display operation when a figure is not rotated will be explained. At this time, as shown in FIG. 5, a display state signal is supplied from the processing device f to the V counter 10 and the H counter 11, and an origin signal is supplied to the component origin register L2b and the vertical component origin register L2c. At this time, the screen is scanned as shown in FIG. 22, and this state corresponds to display state C, and the horizontal position of the screen in FIG. 22 is determined by the output signal of the V counter 10. The vertical position is determined by the output signal of the H counter 11.

The output signal of the H counter 11 is supplied to the adder 12 and the rotation signal 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 output the output signal. has not occurred.

When the display state signal output from the processing device l represents the display state C, the selector 12d and the selector 12e select and output the signals generated from the component origin register 12b and the vertical component origin register 12c, respectively. are doing. As a result, the signal output from the adder 12h is the sum of the data of the output signal of the counter 10 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 12h as it is. Similarly, the adder 12j outputs the output signal of the vertical component origin register 12c, and the adder 12 adds the output signal of the adder 12j, that is, the output signal of the vertical component origin register 12c, and the data of the H counter 11. Output and measure the signal.

The output signals from adder 12i and adder 12 are supplied to latch 13a and selector 13g, as shown in FIG. The correction data generator 13b normally does not need to generate the output amount t) 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 character generator read signal generating section 14, which will be described later.

As described above, selectors 13d to 13g output the signal on the long terminal a side in display state C, so selector 13d and selector 13e output the output signal of adder 13c, and selector 13f and selector 13g output the signal on the long terminal a side. The output signal to the adder 12 is outputted.

As mentioned above, the selector 13h and the selector 13i are
Input terminal a according to the signal supplied from OR circuit 13j
It outputs the signal supplied to l, a2 or bl, b2. In FIG. 22, the V4L signal supplied to one side of the EOR circuit 13j is raster AO-A.
The H4 signal, which does not change during the period shown in FIG. 13(a) to display a tree of n, but is supplied to the other one, specifies the address of the vertical position over the range H in FIG. , as shown in Figure 13(b), V4L
It alternates during the duration of the signal. Therefore, selector 1
3h, the output signal of the selector 13i is input to the input terminal a1. a2
The side, bl, and b2 side are alternately switched.

The output signals of the selector 13h and the selector 13i are supplied to the map section 4 as shown in FIG.
The stored contents are read from the map 4b, and the read stored contents are stored in the latches 4c and 4d, and are supplied to the selectors 14a and 14b shown in FIG. These selectors are supplied with the H4 and V4L signals.
Since the signal from the OR circuit 14m is supplied, the input terminals a and b are synchronized with the selectors 13h and 13i.
is switched.

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, selector 14c~
The signal supplied to the terminal a of the selector 14f is 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 corrected data. 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 14k, 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 state of mode 1 in Table 2, so signals are sent from the respective opposing output terminals.

There is.

The signal generated by the character generator read signal generator 14 is transmitted to the character generator 1 as shown in FIG.
5a to the character generator 15d. As described above, the ■-shaped or H-shaped pattern described later is selected according to the display status signal supplied from the processing device 1, but each character generator does not rotate the figure. At this time, since the processing device 1 is sending out a signal for the display state C, the ■-shaped pattern is selected.

As mentioned above, the units read out by the map section 4 in the V-shaped pattern are as shown in FIG. 11, and in this example, they represent the part where the figure representing the letter F is stored. . In FIG. 11, addresses written in the horizontal direction outside the frame are specified by the CHG -AD (V) signal output from the adder 12i in FIG. Adder 1 of
It is designated by the CHG-AD (H) signal output from 2k. Therefore, adder 12i, adder 12k
16 types of blocks indicated as r-XVI in FIG. 11 can be specified by the V signal and H signal supplied from the block.

These blocks ① to XVI are further composed of four fine blocks, and the fine blocks correspond to each character generator. That is, a, b, c,
The portions marked d correspond to the character generator 15a, the +ceractor generator 15b, the character generator 15c, and the character generator 15d, respectively. Each character generator stores data of 4η points in the vertical direction of the figure, and the shaded part in the figure stores the data of rlj, and the other parts store the data of ``rO''. Konotame, CHG
When the data of the -DAD (V) signal and the CHG-AD (H) signal are both OO, four small blocks marked with "work" in the upper right of FIG. 1 are selected, and the character generator 15a outputs FOOOOj, FOOOOj, + foooo from ceractor generator 15b, 1. f[ollj from the character generator 15c, li'o011. from the character generator 15d. 1 data is read.

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 character generator 15a, is selected, and the remaining shift registers 16b to 16 are selected.
The data of d is discarded. At this time, shift register 16
The timings of a and 16f are synchronized.

Next, when the data of the CHG-AD (H) signal becomes 01, the 11th cause PRO and RI II are selected, and from among them, only the data read from the character generator 15a is similarly selected. Similarly, CHG@AD
(H) When the signal data changes to 10.11, the first
Block in Figure 1 ■.

■ 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 processing device 1, and a group of 16 blocks from 1 to 10 as shown in FIG. and CHG
@AD (V) signal selects one block from I-XVI blocks, thereby character generator 15a to character generator 1
Data of 4 pints is read from 5d.

The CHG-AD(V) signal changes with each round trip of the raster, but the CHG-AD(H) signal changes with the progress of scanning. For example, in FIG.
When the AD (V) signal is 00, the CHG fist AD (H) signal changes to 00, 01, 10.11,
The rightmost block■.

II, [, Data is sequentially read from the TV.

The data read from the character generators 15a to 15d are supplied to and stored in shift registers 16a to 16d shown in FIG. 12. 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 in the direction of the river.

Next, the operation when rotating a figure will be explained.

In addition to the operation described above assuming that the figure is not rotated, the fifth coordinate rotation processing section 12 performs a rotation signal calculation section on the signals supplied to the terminals a of the adders 12i and 12j. 12f and the output signal supplied from the rotation signal calculation section 12g are added together. Therefore, the signal representing the orthogonal coordinates output from the coordinate rotation processing section 12 is transmitted to the rotation signal calculation section 12f and the rotation signal calculation section 1.
The coordinate system is rotated by an angle corresponding to the output signal supplied from 2g, as shown by the dotted line in FIG. In this way, by rotating the coordinate system, even if the output signals of counter 10 and H counter 11 are the same values 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 Figure 'ffi 14, the horizontal position is specified by the V address (the coordinates specified by the V counter 10 are defined as ■address), and the vertical position is specified by the H address (H When no rotation is given to the coordinate system represented by orthogonal coordinates specified by the force counter 11 (the coordinates specified by the force counter 11 are defined as H addresses), the value of the V counter 10 is fixed, and the value of the H counter 11 is
When the value of is changed, access is performed in the direction shown by the solid line 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 memory space is accessed diagonally.

The map section 4, from which data is read out by the signal supplied from the map read signal generating section 13, stores independent display contents for each area surrounded by 16 pixels in the vertical and horizontal directions of the cathode ray tube 7. This map? B4 is, for example, the 8th rg
Data like the one shown in J, that is, when the part surrounded by the double line in the center is accessed, the data representing the letter F is read out, and when the part to the right of it is accessed, the data representing the character B is read out. When the character C is read out and the left neighbor is accessed, the data representing the character C is read out, and when the coordinate rotation processing unit 12 rotates the coordinate system in the right direction, the map unit 4 reads the data represented by the solid line in FIG. accessed as follows. Therefore, data for displaying the character F is read out from the 1st to 11th pixels, while data for displaying the character C is read out from the 12th to 16th pixels. On the other hand, the display timing signal is 1
Since it is generated every 6 pixels, it occurs every time the double line in the horizontal direction 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 arrow in Figure 8, two types of data for displaying letters F and C during one cycle of the display timing signal are obtained. It becomes necessary. In this manner, 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 the 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-dotted line in Figure 8, it is necessary to read out the memory content of the part to the right in addition to the memory content of the part being accessed. be. Therefore, the stored content of the part currently being accessed is defined as "r-Nara", the stored content of the part to the left thereof is defined as "Next", and the stored content of the part to the right is defined as "r-back".

The correction data generator 13b in FIG. 6 is provided for this purpose, and for the 5-beat 2-bit signal for reading the data of the map supplied from the latch 13a, the correction data generator 13b in FIG.
Corrections were made as shown in the table. For example, display form 8
In 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, and when the figure is rotated to the left, lo is subtracted. 0 display state C
At this time, the signal supplied from the V counter 11 and stored in the latch 13a indicates the horizontal position of the map. Therefore, the 5-bit signal supplied from latch 13a identifies the horizontal positions in FIG. 8, that is, the characters C, F, and H. , then adding 1 to it specifies the position to the left, which means accessing the character C, and subtracting l means accessing the character B. As a result,
The signal at the terminal a on the input side of the adder 13c is the memory content of the part currently being accessed, that is, the signal of "rNara";
The signal at the output terminal C is added with the signal from the correction data generator 13b in accordance with the signal supplied from the processing device 1, and represents the signal of γ NEXT'' or f pack j.

As mentioned above, the V signal output from the adder 12i is a signal that specifies the horizontal position of the map at the time of access, and the correction by the correction data generator 13b is sent from the latch 13a to the adder 13c. This is done on the supplied signal.

Therefore, when a figure is rotated, for example, if 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. Therefore, even if the output signal of the adder 12i changes during the repetition period of the 1 display timing signal, the addition z
A latch 13a is provided to fix the data so that the contents of the ■ signal supplied to the 413c do not change.

Since the selectors 14a and 14b in FIG. 9 are switched in synchronization with the launch 13a and correction data generator 13b in FIG. Selector 14b
is outputting a signal of rNaraA. On the other hand, in display state C, the horizontal selection of each memory content in FIG.
Since the vertical storage content is selected by the H signal, if the access shown by the solid arrow in Fig. 8 is performed, the H4 signal will select from the 1st to the 16th pixel. The data content does not change when up to the pixels are accessed, but the data content of V44 changes from the time the 12th pixel is accessed. Therefore, the output signal of the EOR circuit 14n changes after this point, and based on this change, it is determined that it is necessary to switch the displayed screen to "NEXT J".

The information determined by the EOR circuit 14n is transferred to the shift register 1.
4i and stored in latch 14h. and,
In response to the left and right signals and the display status signal supplied from the processing device 1, the switch circuit 14g sends out an output signal controlled in mode 1 or mode 2 as shown in Table 2, and which selector among the selectors 14cm and 14f is set to r?
It is determined which selector selects the data of r-next 1.

The data read out from the character generator section 15 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.

As a result, when no rotation is applied to the coordinate system, Fig. 15 (a
), when a triangular figure is displayed on the screen, if the memory is accessed as shown by the solid arrow in Figure 8, the displayed figure will move to the left as shown in Figure 15(b). Displayed as a rotated 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(C).

Diagram m20 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 orthogonal coordinates indicated by the thick line with rotation. In the same figure, the letter F
Since the data of CH is stored in the same way as in Fig. 11,
G-No. 00 is sent to the character generator 15a.
l corresponds to the character generator 15b, 10 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 16a to 16d. Initially, the 1st pixel to the 16th pixel is accessed, and CHG-No Ol data is supplied from the shift register 16f to the selector 16e, and the character generator 1
Shift register 16c storing data 5c is selected. A mask timing signal is supplied to this shift register 16c, and data corresponding to the first pixel and data corresponding to the second pixel are successively read out. At this time, since the mask timing signal is also supplied to the other shift registers, the data corresponding to the pixels represented by symbols B, C, 口, and C are also read out, but these data are not processed by the selector at the current timing. 16e
The data read from the shift register 16c at this timing is not the character F but a blank portion, so it is not output.

Next, data "11J" is supplied from the shift register 16f to the selector 16e in order to read data necessary for the third pixel from the shift register 16d storing data of the character generator 15d. The data necessary for the third pixel is read out from this shift register 16d at the third bit of the mask timing.This data is for displaying the character F, so it is "11." The data rlJ corresponding to the pixel is read out, but since the CHG-AD (V) (7) data has changed, the read data is read out 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 columns marked A-P are accessed, and the columns A-I and a-p are sequentially accessed. As a result, the hatched area in FIG. A rotated figure of the letter F is displayed. In this device, the character generators specified by CHG@AD (■) and CHG-AD (H) are read at the same time, and the necessary data is used from among them, so the read speed of the memory is limited to one memory. It is possible to construct the device simply and economically, with only one-fourth of the amount required when constructed with the following. In addition, in the example of Fig. 20, character generator 1
A signal is supplied from the shift register 16f so that selections 5c, 15d, 15a, and 15b are performed in order, but this signal changes depending on the position of the character generator where access is started, and the selection is performed in the order of access. The data is sorted accordingly.

When there is no need to apply rotation to the displayed figure, memory access is performed in the direction shown by the dotted line in FIG. Direction can be controlled arbitrarily. This control is performed so that the next pixel to be scanned after the pixel currently being scanned is a pixel adjacent to the pixel currently being scanned, as shown in FIG. Therefore, the next pixel to be scanned after pixel P1 is one of P1 to P3, and the access direction is limited to a maximum of 45 degrees.

As a result, when access is performed 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 be from the position of the dashed-dotted line to the position of the dotted line in Figure 17. It will rotate within the range.

However, as it is, it is not possible to rotate the displayed figure by more than 45 degrees, but the horizontal access to the memory is
A signal generated from the adder 12k based on the counter 11 (this signal is defined as an H access signal) is used to access the memory in the vertical direction, and a signal generated from the adder 121 based on the V counter 10 (this signal is defined as (defined as V access signal), the figure displayed as shown in FIG. 17 is displayed as shown in FIG. 18(b). As a result, the figure shown by the dashed-dotted line in FIG. 18(b) is the figure shown by the solid line in FIG. 17 rotated 135 degrees to the right. On the other hand, the 17th
In the figure, if the directions of change of the ■ access signal and the H access signal are reversed, the displayed figure becomes as shown in the tjSla diagram (a). Figure 18(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 position of the access signal and the H access signal and the changing direction of the data, the figure can be rotated to any angle and displayed.

The display state of FIG. 18 corresponds to the display state of FIG. 3, and the display state of figures in the display states A, B, C, and D described above is (a) in FIG. ff118.

(b), (c), and (d). Here, the 18th
Figures (a), (C) and Figure 18 (b), (d)
In this case, the V access signal and the H access signal are exchanged. In order to perform such exchange of access signals, selectors 13d to 13g shown in FIG. 6 are provided. The above explanation of rotating 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, where the horizontal position is the CHG-AD (V) signal. , and the vertical position is represented by the CHG-AD (H) signal.
It used a pattern of shapes. Even in display state A,
The V-shaped pattern shown in FIG. 11 can be used because only the change direction of each signal changes, but the combination of signals itself does not change. However, in display states B and D, the horizontal direction is H.
It is an access signal, and the vertical direction is ■Access signal, so if you try to display the same figure as shown in Figure 11 on the screen, you will have to rotate the V-shaped pattern by 90 degrees as shown in Figure 19. Since it is necessary to use an H-shaped pattern, the character generators 15a to 15d are
The image forming apparatus 1 has two types of patterns: an H-shaped pattern and an H-shaped pattern, and the pattern is selected according to a display state signal rotation signal supplied from a processing device 1.

Note that the processing device 1 generates a display state signal, an origin signal, a rotation angle signal, and a left/right direction signal, but these signals may be controlled manually by the operator or may be generated by software control. ,Although the maximum rotation angle is 45 degrees, it may be less than that, and the memory composed of the map and character generator may be RAM, so
Even on a graphic display, figures can be rotated and displayed at extremely high speed. Further, in order to give continuous rotation to the displayed figure, it is sufficient to continuously change the rotation minute signal generated from the processing device 1.

[Effects of the Invention] As explained below, in the present invention, both the data of a display section and the data of the section adjacent to the display section are read out, and the data is selected according to the display state.
This has the effect that normal display can be performed when the displayed figure is rotated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention;
Fig. 2 is a graph for explaining the rotation of coordinates, Fig. 3 is a graph for explaining the relationship between memory and display area, Fig. 4 is a graph for explaining the display state, and Fig. 5 is a graph for explaining the rotation of coordinates. 6 is a block diagram showing details of the map readout signal generating section 13 in FIG. 1, and FIG. 7 is a block diagram showing details of the map section 4 in FIG. 1. 8 is a diagram showing the stored contents of the map and the access direction, and FIG. 9 is a block diagram showing details of the character cinerator read signal generation section 14 in FIG. 1.
Figure 10 shows the character generator section 1 in Figure 1.
11 is a diagram showing the V-shaped pattern stored in the character generator, FIG. 12 is a block diagram showing details of the figure assembly section 16 in FIG. 1, and FIG. A diagram showing the relationship between the V@ number and the H@ number, 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, and Fig. 16 17 is a diagram showing the scanning direction of pixels, FIG. 17 is a diagram showing the rotation range of the display figure in the display state WAc,
FIG. 18 is a diagram showing the display state when the same figure is rotated in four display states A, n, c, and o. FIG. 19 is a diagram showing the H-shaped pattern stored in the character generator. Figure 20 is a diagram showing the character generator being accessed to explain the rotation of figures;
FIG. 21 is a diagram showing the actual display state of figures, and FIG. 22 is a diagram for explaining raster. Fig. 23 is a block diagram showing the configuration of a conventional device, Fig. 24 is a block diagram for explaining the memory contents of the character generator, and Fig. 25 shows the state in which the signals read out in Fig. 24 are displayed. This is a swimming pool. Agent Masatsuna Yamakawa (and 2 others) Figure 2 ■ Figure 3 Δ Figure 4 (d) Figure 11 -m-1-J-IJ 〉 Figure 19 Figure 22 Figure 24 Figure 25

Claims (3)

[Claims] (1) When displaying a figure by displaying independent images in multiple sections, a read signal expressed in coordinates different from the coordinates of this memory is supplied to a memory that stores data necessary for displaying the figure. In a graphical display method that reads data and displays the read data, the data necessary for the section to be displayed is read from memory, and
A new readout signal is generated by correcting the readout signal according to the display state, and this new readout signal reads out the data in the section adjacent to the section to be displayed, and the two types of read data are displayed. A figure display method characterized by selection according to a state. (2) When displaying a figure by displaying independent images in multiple sections, a readout signal expressed in coordinates different from the coordinates of this memory is supplied to the memory that stores the data necessary for displaying the figure. In a graphic display device that reads data and displays the read data, means for reading data in a section to be displayed, means for reading data in a section adjacent to the section to be displayed, A graphic display device comprising means for selecting data according to a display state. (3) When displaying a figure by displaying independent images in multiple sections, a readout signal expressed in coordinates different from the coordinates of this memory is supplied to the memory that stores the data necessary for displaying the figure. Read the data, read out the data necessary for the section to be displayed from memory, and
A new readout signal is generated by correcting the readout signal according to the display state, and this new readout signal reads out the data in the section adjacent to the section to be displayed, and displays the two types of read data. 1. A graphic display method that selects a graphic display method according to the state of the graphic display, characterized in that a readout signal to be supplied to a section to be displayed is stored.