JPH05743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen editing device in a data processing device such as a computer device having a display device.

[Conventional technology]

BACKGROUND ART A data processing device such as a computer device equipped with a display device is configured to display various types of processing information on the display screen of the display device so that the processing information can be easily checked. Display information includes various types of information such as characters, symbols, figures, images, etc., and these are displayed on the display screen as necessary. Furthermore, a data processing device equipped with this type of display device not only simply displays information on the display screen, but also configures the information displayed on the display screen so that it can be edited into various states on the display screen. There is. That is, this type of device is equipped with a screen editing function, and allows various editing operations such as correction, addition, insertion, and deletion to the information displayed on the display screen.

In order to display various information on the display screen of the display device, the data processing device is equipped with screen display information storage means corresponding to the display screen. The stored contents of the screen display information storage means are sequentially read out by the display control means and displayed on the display screen. Therefore, when editing, it is possible to edit the display information to a desired state by rewriting the stored contents of the screen display information storage means.

As a reference for this type of editing technique,
JP-A-60-51938, JP-A-59-71532, JP-A-Sho
No. 58-99829, JP-A-58-94027, JP-A-58-
There is No. 70349.

[Problem that the invention seeks to solve]

A conventional data processing device equipped with a screen editing function is extremely effective in terms of operation because editing operations can be performed in correspondence with a display screen or the like.

However, the conventional system lacks consideration for operability in case of erroneous editing by an operator, and as a result, there are problems with the recovery operation.
For example, if a character, figure, etc. entered by an operator is incorrectly entered, it is necessary to return the display screen to the state before the error was made, but in order to do this, the incorrectly input character, figure, etc. must be erased. operation is required. Especially when inputting shapes, if a newly input shape that is superimposed on an already displayed shape is input incorrectly, erasing the incorrectly input part will also erase the overlapping part of the already displayed shape. In many cases, it is difficult to return to the state before the erroneous input occurred. Furthermore, graphics can often be input in units of dots, and operations such as specifying the position of the graphics to be erased when erasing an erroneously input portion are troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a screen editing device that can easily return display information to the state immediately before the erroneous input in response to an erroneous input, and can improve operability.

[Means for solving problems]

It is equipped with a display screen that displays a desired image as a whole using a large number of dots, and on the display screen, characters,
A data processing device that has a display device that displays various information such as symbols, figures, images, etc. is equipped with a screen buffer memory that corresponds to the display screen and stores image information for the display screen. The stored contents of this screen buffer memory are read out by the display control means and displayed on the display screen. Therefore, by changing the contents stored in the screen buffer memory, various edits such as correction, deletion, insertion, addition, etc. can be performed. For this purpose, an editing command input means for commanding the editing is provided. Therefore, in the present invention, image information as a result of predetermined editing is stored in the buffer memory, and an auxiliary screen buffer memory corresponding to the screen buffer memory and in response to an editing command from the editing command input means, and image information copying means for copying and storing the stored contents of the screen buffer memory at the relevant time point in the auxiliary screen buffer memory. Further, a return command input means for requesting copying of image information from the auxiliary screen buffer memory to the screen buffer memory, and a display information return unit for copying and storing image information from the auxiliary screen buffer memory to the screen buffer memory in response to the return command. and means.

[Effect]

In order to edit the image information displayed on the display screen, when a desired editing command is input from the editing command input means, the image information copying means responds to this editing command and produces image information as a result of predetermined editing. The stored contents of the screen buffer memory that have been stored are copied to the auxiliary screen buffer memory. Thereby, display information immediately before the editing command is reflected on the display screen can be stored in the auxiliary screen buffer memory. The display image information stored in the auxiliary screen buffer memory is copied and stored in the screen buffer memory by the display information return means by inputting a return command through the return command input means.

Therefore, in response to a request to return the image information before the editing due to some reason such as editing error after performing the desired editing operation, the image information before the editing can be returned by the simple operation of inputting a return command. Display information can be returned to the state.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below. FIG. 2 is a block diagram showing the overall configuration of a computer device generally called a personal computer or a business computer. In this figure, 1 is a cathode ray tube display device (hereinafter simply referred to as CRT) having a display screen SC, and 2 is a random access storage device (hereinafter simply referred to as CRT).
It is abbreviated as RAM. ), 3 is a microprocessor that is an arithmetic processing unit, 4 is a keyboard that constitutes an input unit, and 5 is a read-only storage device (hereinafter referred to as ROM).
It is abbreviated as. ). 6 is a clock oscillation circuit that generates a clock signal that serves as a reference for operation, 7 is a timing control circuit, and 8 is for a character font.
ROM, 9 is a CRT control circuit constituting display control means, 10 is a screen buffer memory constituting screen display information storage means, and 11 is a parallel/serial conversion circuit. A screen editing processing program as a screen editing processing means for realizing a screen editing function is stored in advance in the RAM 2 and ROM 5. This screen editing processing program is not special at all and has been commonly used in the past, and its outline is as follows. That is, when information for various edits is input from the keyboard 4, the microprocessor 3 operates based on this screen editing processing program, and the displayed information processed thereby is stored in the screen buffer memory 1.
Stored as 0. At this time, information such as characters is developed into a character font in the character font ROM 8 and transferred and stored in the screen buffer memory 10. Thereafter, similarly, the microprocessor 3 responds to input from the keyboard 4 based on the screen editing program, and transfers and stores the processed display information in the screen buffer memory 10. Clock transmission circuit 6
inputs basic pulses so that the microprocessor 3 operates regularly.

On the other hand, the basic clock pulse from the clock generating circuit 6 is also input to the CRT control circuit 9.
The CRT control circuit 9 receives this basic pulse and
The display information stored in the screen buffer memory 10 is sequentially read out from the screen buffer memory 10. This read display information is converted into a pulse train through a parallel/serial conversion circuit 11. This pulse train is input to the CRT 1 as a video signal v. Furthermore, the synchronizing signal s output from the CRT control circuit 9 is also input to the CRT 1. CRT1 uses these signals to
If the video signal v is a high level voltage,
Light up the dot at the corresponding position on CRT1 brightly. This scans the display screen of the CRT 1 from the upper left to the right based on the synchronization signal s, and then scans the column from the left to the right, thereby displaying all dots on the display screen of the CRT 1. Therefore,
The CRT control circuit 9 sequentially takes out the display information of the screen buffer memory 10 from the upper left to the right of the CRT 1, and then the display information of the next row, and sends it to the parallel/serial conversion circuit 11. For this reason,
The CRT control circuit 9 generates a memory address for the screen buffer memory 10 so that display information can be retrieved in the above order.

Reference numeral 13 denotes a floppy disk device constituting an external storage device, which is connected to the microprocessor 3 via a floppy disk controller 12. As a result, various created programs or display information in the screen buffer memory 10 can be transferred to the floppy disk device 1 as needed.
3 can be stored. Further, the stored programs, display information, and other data can be called up as needed, stored in a storage unit such as the RAM 2 or the screen buffer memory 10, and made available for processing.

In the above configuration, in this embodiment, auxiliary screen buffer memories 10a and 10b are provided as auxiliary screen display information storage means in correspondence with the screen buffer memory 10 as screen display information storage means. This auxiliary screen buffer memory 10a, 10
Each of b has the same storage capacity as the screen buffer memory 10, and is configured to be able to copy and store the contents of the screen buffer memory 10. The keyboard 4 contains corrections and corrections for the screen editing program mentioned above.
It is equipped with various keys for inputting information for instructing various edits such as deletion, insertion, and addition. These editing command keys act as editing command input means. Furthermore, in this embodiment, a return command key that functions as return command input means is arranged on the keyboard 4. The keyboard 4 generally includes a large number of alphanumeric keys, special keys, and the like. The return command key may be newly provided on the keyboard 4, or may be assigned to an already provided key.

FIG. 1 shows a screen buffer memory 10, an auxiliary screen buffer memory 10, etc. in response to inputs from various edit command keys arranged on a keyboard 4 constituting an edit command input means and return command keys arranged on a keyboard 4 constituting a return command input means. Screen buffer memory 10a, 10
12 is a flowchart showing an example of a screen information control means for controlling and operating the storage contents of FIG. The main parts of this screen information control means are composed of a display information copying means STM and a display information restoring means SRM. The screen information control means shown in FIG.
This is sequentially read out and executed by the microprocessor 3. A predetermined function is achieved by this execution.

The display information copying means STM is a means for responding to an edit command key arranged on the keyboard 4 and copying and storing the stored contents of the screen buffer memory 10 at the relevant time point in the auxiliary screen buffer memories 10a and 10b. In this embodiment, a case is shown in which two sets of auxiliary screen buffer memories are provided, that is, an auxiliary screen buffer memory 10a and an auxiliary screen buffer memory 10b, and therefore the display information copying means is the first display information copying means STMa and the second display It consists of an information copying means STMb. That is, the first display information copying means STMa copies and stores the stored contents of the auxiliary screen buffer memory 10a in the auxiliary screen buffer memory 10b, and the second display information copying means STMb copies and stores the stored contents of the screen buffer memory 10 in the auxiliary screen buffer memory 10a. .
As a result, the auxiliary screen buffer memories 10a, 1
0b is ranked and as the editing operation progresses,
The memory contents at a certain point in time of the screen buffer memory 10a are stored in the auxiliary screen buffer memory 1 of the higher rank.
0a, lower ranking auxiliary screen buffer memory 10b
They are copied and stored sequentially in this order. FIG. 3 is a flowchart showing the first display information copying means STMa,
FIG. 4 is a flowchart showing the second display information copying means STMb.

The display information return means SRM is a means for copying and storing the stored contents of the auxiliary screen buffer memories 10a and 10b in the screen buffer memory 10 in response to a return command key arranged on the keyboard 4. In this embodiment, a case is shown in which the contents of the auxiliary screen buffer memories 10a and 10b can be alternately copied and stored in the screen buffer memory 10a depending on the number of operations of the return command key. FIG. 5 is a flowchart showing details of the display information restoration means SRM' which constitutes the main part of the display information restoration means SRM.

The screen information control means shown in FIG. 1 will be explained in detail below. When the means is activated, initial settings are first performed in steps 1a, 1b, and 1c.
That is, in step 1a, the stored contents of the screen buffer memory 10 are transferred to the auxiliary screen buffer memory 10.
In step 1b, the contents of the auxiliary screen buffer memory 10a are copied and stored in the auxiliary screen buffer memory 10b. This starts the second display information copying means STMb, which will be described in detail later, in step 1a, and
This is accomplished by starting STMa in step 1b. In step 1c, a screen buffer pointer BP that specifies either the auxiliary screen buffer memory 10a or 10b is set and set to "0".
Initialize to . Then, in step 1d, an input from an edit command key arranged on the keyboard 4 is waited for. If any edit command key is input here, it is determined in the following step 1e whether or not the command is an edit end key. If this is an input of the editing end key, the processing of the screen information control means is ended. Otherwise, it is determined in step 1f whether this input is a screen return command. If it is not a screen return command, the input key is an edit command key, so the process moves to step 1g, where the screen buffer pointer BP is set to "0". The data such as characters corresponding to the keys input from the keyboard 4 in step 1d is temporarily stored in the keyboard buffer. step
At step 1h, if data remains in this keyboard buffer, the process returns to step 1d.
This step 1h is especially effective when inputting Japanese. In other words, the character string to be entered at a predetermined position on the screen is entered in the keyboard buffer on the keyboard 4.
, and when this is displayed, for example, on the bottom line of the display screen SC, follow the steps described below.
This is because if you execute 1i and 1j, you will not be able to return to the screen you were on before you entered the character string.

If no data such as characters remains in the keyboard buffer in step 1h, processing is transferred to the display information copying means STM. As described above, this display information copying means STM consists of the first display information copying means STMa and the second display information copying means STMb. First, the first display information copying means STMa shown in step 1f copies and stores the contents of the auxiliary screen buffer memory 10a in the auxiliary screen buffer memory 10b. Second display information copying means STMb shown in the following step 1j
copies and stores the contents of the screen buffer memory 10 in the auxiliary screen buffer memory 10a. Then, in step 1k, the screen editing processing means EDT is activated, and predetermined editing is performed on the screen buffer memory 10. When the processing of this screen editing processing means EDT is completed, the processing moves to step 1d, and waits for input of the next editing command.

Steps 1i and 1j are executed each time an editing command is input from the keyboard 4 in step 1d, and are executed before the editing command is executed. After executing step 1i and step 1j, predetermined screen editing is performed in step 1k. Therefore, after executing step 1k, the screen buffer memory 10 stores the screen display information after predetermined editing, and the auxiliary screen buffer memory 10a stores the screen display information before the editing. is stored, and the screen display information before the previous editing command is further stored in the auxiliary screen buffer memory 10b.

If it is determined that the command input in step 1f is a screen return command, the process starts with display information return means.
Moving on to SRM. First, in step 1l, 1 is added to the screen buffer pointer BP. Then, in step 1m, it is determined whether the content of the screen buffer pointer BP exceeds 2, and if it does not, the process moves to step 1n. In step 1n, the display information return means forming the main body of the display information return means STM
Start STM′. The display information storage means SRM' stores the auxiliary screen buffer memories 10a and 10b indicated by the screen buffer pointer BP, as will be described in detail later.
The stored contents are copied and stored in the screen buffer memory 10. In this example, the screen buffer pointer
If BP is 1, auxiliary screen buffer memory 10a
and if this is 2, it indicates the auxiliary screen buffer memory 10b. If the value of the screen buffer pointer BP exceeds 2 in step 1m, this value is forcibly set to 1 in step 1o, and then the process moves to step 1n.

The screen buffer pointer BP is set to zero in steps 1c and 1g. When a screen return command key arranged on the keyboard 4 is pressed after executing a certain editing command, the value of the screen buffer pointer BP becomes "1" in step 1l. As a result, in step 1n, the contents of the auxiliary screen buffer memory 10a are copied and stored in the screen buffer memory 10. This means that the contents of the screen buffer memory 10 have been rewritten to the screen information before the editing that was performed before this screen return command key was pressed. That is, the screen before the previous editing is displayed on the display screen. If you press the screen return command key again in succession, step 1l will return.
The value of the screen buffer pointer BP becomes "2".
As a result, in step 1n, the memory contents of the auxiliary screen buffer memory 10b are changed to the screen buffer memory 1.
A copy is stored in 0. This means that the screen display information before the previous editing has been copied and stored in the screen buffer memory 10. Also,
If the screen return command key is pressed further consecutively, the value of the screen buffer pointer BP becomes "3". Then, at step 1o, the value of this pointer BP is “1”
In step 1n, the contents of the auxiliary screen buffer memory 10a are copied and stored in the screen buffer memory 10 again. That is, when the screen return command key is pressed successively, the contents of the auxiliary screen buffer memory 10a and the auxiliary screen buffer memory 10b are alternately copied and stored in the screen buffer memory 10.

FIG. 7 shows an example of a specific operation. In this example, the straight lines L1, L
2. A triangle was drawn on the display screen in L3, but if for some reason it becomes necessary to return the display screen to the screen on which the straight line L1 is drawn, the screen buffer memory 10 and auxiliary screen buffer memories 10a and 10b at each point in time. The memorized contents are shown diagrammatically. First, at an initial point in time, no display information is stored in the buffer memories 10, 10a, and 10b. When the editing of the straight line L1 is completed at a certain time point n and an editing command is input to edit the straight line L2, the contents of the buffer memory 10a are changed to the buffer memory 10a by steps 1i and 1j in FIG.
b, the contents of the buffer memory 10 are copied and stored in the buffer memory 10a. Then step
Linear editing is performed at 1k. Time point (n+1) indicates the stored contents of each buffer memory 10, 10a, 10b immediately after editing of straight line L2 is executed. Similarly, at time (n+2), each buffer memory 10, 10a, immediately after the editing of straight line L3 is executed,
10b shows the storage contents of 10b. After editing straight line L3,
When a user notices some kind of mistake and presses the return command key arranged on the keyboard 4 once, the contents stored in the buffer memory 10a are copied and stored in the buffer memory 10 by the action of the display information return means SRM shown in FIG. Time point (n+3) indicates the stored contents of the screen buffer memory 10 at this time. When the return command key is pressed again, the contents of the buffer memory 10b are copied and stored in the buffer memory 10. Time point (n+4) indicates the stored contents of the screen buffer memory 10 at this time. From then on, each time you press the return command key, the time points (n+3) and (n+
The state of 4) is repeated. Therefore, if you want to start editing from the state at time (n+3),
It is sufficient to input an editing command after the display screen is displayed, or if it is desired to start editing from the state at time (n+4), the edit command may be input after the display screen is displayed.

Figure 3 shows the steps 1b and 1i shown in Figure 1.
It is a flowchart showing details of display information copying means STMa. This figure will be explained below. As described above, the first display information copying means STMa is a means for copying and storing the contents of the auxiliary screen buffer memory 10a in the auxiliary screen buffer memory 10b. When the first display information copying means STMa is activated, first in step 3a, in order to sequentially read the display information stored in the auxiliary screen buffer memory 10a, a read address pointer is used to sequentially scan and designate each address of the auxiliary screen buffer memory 10a. Initialize P1. That is, this is a step for setting the start address of the auxiliary screen buffer memory 10a in the address pointer P1. In step 3b, in order to sequentially write the display information read from the auxiliary screen buffer memory 10a into the auxiliary screen buffer memory 10b, the write address pointer P2 sequentially scans and specifies the write address of the auxiliary screen buffer memory 10b.
Initialize. That is, this is a step for setting the start address of the auxiliary screen buffer memory 10b in the address pointer P2. In the following step 3c, it is determined whether each address pointer P1, P2 has exceeded the final address of the corresponding auxiliary screen buffer memory 10a, 10b, that is, all addresses of the auxiliary screen buffer memory 10a, 10b to which each address pointer P1, P2 corresponds are scanned. Determine whether it is specified. In step 3d, the display information stored at the address specified by the address pointer P1 of the auxiliary screen buffer memory 10a is read, and this display information is written to the address specified by the address pointer P2 of the auxiliary screen buffer memory 10b. In step 3e, the addresses stored in each address pointer PP1, P2 are incremented by "1". Then process step 3c
Move to. After that, steps 3c, 3d, and 3e are repeatedly executed, and in step 3c, each address pointer P1,
Whether or not the address stored by P2 exceeds the final address of the corresponding auxiliary screen buffer memory 10a, 10b, that is, each address pointer P1, P
2 corresponds to the auxiliary screen buffer memory 10a, 1
This is repeated until all addresses in 0b are scanned and specified.
Then, when the conditions of step 3c are satisfied, the processing of the first display information copying means STMa is ended.
As a result, the contents stored in the auxiliary screen buffer memory 10a are copied and stored in the auxiliary screen buffer memory 10b.

Figure 4 shows the steps 1a and 1j shown in Figure 1.
It is a flowchart showing details of display information copying means STMb. This figure will be explained below. As described above, the second display information copying means STMb is a means for copying and storing the contents of the screen buffer memory 10 in the auxiliary screen buffer memory 10a. When the second display information copying means STMb is activated,
First, in step 4a, the screen buffer memory 10
In order to sequentially read display information stored in
A read address pointer PO that sequentially scans and designates each address of the screen buffer memory 10 is initialized. In other words, this is a step for setting the start address of the screen buffer memory 10 in this address pointer PO. In step 4b,
In order to sequentially write the display information read from the auxiliary screen buffer memory 10 into the auxiliary screen buffer memory 10a, a write address pointer P1 that sequentially scans and specifies the write address of the auxiliary screen buffer memory 10a is initialized. That is, this is a step for setting the start address of the auxiliary screen buffer memory 10a in the address pointer P1. In the following step 4c, each address pointer P0, P1 corresponds to the buffer memory 10,
It is determined whether the final address of buffer memories 10, 10a has been exceeded, that is, whether all addresses in the buffer memories 10, 10a corresponding to each address pointer P0, P1 have been scanned and specified. In step 4d, the display information stored in the address specified by the address pointer P0 of the screen buffer memory 10 is read, and this display information is transferred to the auxiliary screen buffer memory 1.
Write to the address specified by address pointer P1 of 0a. In step 4e, the addresses stored in each address pointer P0, P1 are incremented by "1". Then, the process moves to step 4c. Thereafter, steps 4c, 4d, and 4e are repeatedly executed, and in step 4c, the buffer memories 10, 1 corresponding to the addresses stored by the address pointers P0, P1 are
The scanning is continued to determine whether or not the final address of 0b has been exceeded, that is, until all addresses of the buffer memories 10, 10a corresponding to each address pointer P0, P1 are scanned and specified. Then, when the condition of step 4c is satisfied, the processing of the second display information copying means STMb is ended. As a result, the memory contents of the screen buffer memory 10 are changed to the auxiliary screen buffer memory 10a.
A copy is stored in the .

FIG. 5 is a flowchart showing details of the display information restoration means SRM' shown in step 1n in FIG. This figure will be explained below. The display information restoration means SRM' is a means for copying and storing the stored contents of the auxiliary screen buffer memories 10a and 10b designated by the screen buffer pointer BP in the screen buffer memory 10, as described above. When the display information restoration means SRM' is activated, first step 5 is executed.
At a, in order to sequentially read the display information stored in the auxiliary screen buffer memories 10a, 10b specified by the screen buffer pointer BP, a read address pointer (BP) is used to sequentially scan and designate each address of the auxiliary screen buffer memories 10a, 10b. ) is initialized. This means that this address pointer P (BP) has a screen buffer pointer.
Auxiliary screen buffer memory 10a specified by BP,
This step is to set the start address of 10b. In step 5b, the screen buffer memory 10
In order to sequentially write the display information read from the auxiliary screen buffer memories 10a and 10b, a write address pointer P0 that sequentially scans and designates the write addresses of the screen buffer memory 10 is initialized. In other words, this is a step of setting the start address of the screen buffer memory 10 in the address pointer P0. In the following step 5c, it is determined whether each address pointer P0, P(BP) has exceeded the final address of the corresponding buffer memory 10, 10a, 10b, that is, whether each address pointer P0, P(BP) has exceeded the final address of the corresponding buffer memory 10, 10a, 10b.
It is determined whether all addresses 10a and 10b have been specified for scanning. In step 5d, the display information stored at the address specified by the address pointer P (BP) of the auxiliary screen buffer memories 10a, 10b is read, and this display information is written to the address specified by the address pointer P0 of the screen buffer memory 10. In step 5e, the addresses stored in each address pointer P0, P(BP) are incremented by "1". Then process step 5c
Move to. After that, steps 5c, 5d, and 5e are repeatedly executed, and in step 5c, each address pointer P0,
Whether or not the address stored in P(BP) exceeds the final address of the corresponding buffer memory 10, 10a, 10b, that is, each address pointer P0,
Buffer memory 10, 10 corresponding to P (BP)
This is repeated until all addresses a and 10b are scanned and specified. Then, when the condition of step 5c is satisfied, the processing of the display information restoration means SRM' is ended. This causes the auxiliary screen buffer memories 10a and 10b specified by the screen buffer pointer BP to
The stored contents are copied and stored in the screen buffer memory 10, and the screen information is restored to the screen buffer memory 10.

FIG. 6 is a flowchart showing the screen editing processing means EDT shown in step 1k in FIG.
This screen editing processing means EDT is nothing special and has been used conventionally, and this figure shows its outline. Before this means EDT is activated, the command code of the editing command input in step 1d of FIG. 1 is stored in the memory OPIN.
Assume that it is stored in memory. Further, it is assumed that this screen editing processing means EDT has, for example, 10 types of editing processing functions, and this number "10" is set in the storage section Nmax. Here, for example, editing process 1
Line input processing is used for editing process 2, circle input processing is used for editing process 2,
Below, various editing processes are set in the same way, and editing process 10
It is assumed that display screen clear processing is set for . Now, for example, if you try to draw a circle on the display screen SC and press the edit key that corresponds to circle input,
In step 1d of FIG. 1, the instruction code is stored in the storage unit OPIN, and in step 1k of FIG. 1, the screen editing processing means EDT is activated. Memory section OP
In 1, OP2, . . . , OP10, instruction codes corresponding to the above-mentioned editing processes 1, 2, . . . , 10 are registered in advance. First, in step 6a,
A search pointer j for searching for editing processing is set to "1". In step 6b, the stored contents of this search pointer j are compared with the stored contents of the storage section Nmax. Then, if the stored content of the search pointer j exceeds the stored content of the storage unit Nmax, the processing of the screen editing processing means EDT is ended. If it does not exceed the limit, in step 6c, the storage section is
The storage contents of OPIN and the storage contents of storage unit OPj are compared. The storage unit OPj stores an instruction code for editing process j. Therefore, the input instruction code stored in the storage unit OPIN,
If the contents of the storage section OPj are equal, editing process j is executed in step 6d. Next, in step 6e, the stored content of the search pointer j is incremented by "1", and the process returns to step 6b. Steps 6b, 6c, 6d, 6e
In this case, the contents of the storage section OPIN are the same as the contents of the storage section OPj.
The process ends after being compared twice, but if you press the edit key that corresponds to the yen input, the memory
Since the contents of OPIN and the contents of storage unit OP2 are equal, editing process 2, that is, editing process for yen input, is executed as instructed. Through this editing process, the contents of the screen buffer memory 10 are rewritten to a predetermined state and displayed on the display screen SC.

As described above, when an editing command is inputted from the keyboard 4, the stored contents of the screen buffer memory 10 are saved to the auxiliary screen buffer memory 10a before the editing is executed each time. The memory contents of 10a are saved to auxiliary screen buffer memory 10b. Then, for the screen buffer memory 10,
A predetermined editing operation is performed. When the screen return command key placed on the keyboard 4 is pressed, the auxiliary screen buffer memory 10a, 10 is activated depending on the number of times the key is pressed.
b is selected, and its stored contents are restored to the screen buffer memory 10. Therefore, after performing an editing operation, if you notice an error in the editing and want to return to the state before the editing was performed, you can do so simply by pressing the screen return command key located on the keyboard 4. In order to continue the editing operation, a predetermined editing operation may be performed after the display screen returns to its previous state.

Further, according to the embodiment, since the contents of the screen buffer memory 10 corresponding to the display screen are saved and restored, as long as the contents can be displayed on the display screen, not only characters, symbols, and graphic information but also It is applicable to various display information such as image information.

In the above embodiments, the case where two auxiliary screen buffer memories are provided as auxiliary screen display information storage means has been explained as an example, but the number may be one, or there may be three or more. Good too. In the present invention, this number is not limited and can be arbitrarily selected depending on the type of device. Further, although the CRT display device has been described as an example of the display device, various devices such as a liquid crystal display device can be used. Further, although the editing command input means and the return command input means are explained using keys arranged on the keyboard 4 as an example, the form and arrangement position thereof are arbitrary, and can be easily changed as necessary. It is possible. Furthermore, for the convenience of explanation, the display information copying means STM and the display information restoration means SRM are only shown as examples with easy-to-understand configurations, and they may also be of a structure that is further improved in efficiency, etc. In short, any other configuration may be used as long as it achieves the predetermined function.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, even though the image information resulting from predetermined editing is stored in the screen buffer memory, erroneous input can be prevented by the operator. It is possible to obtain a screen editing device that can easily return image information to the state immediately before it was created, and that can improve operability. In addition, when copying the screen buffer memory to the auxiliary screen buffer memory, it is automatically performed according to the editing command from the editing command input means, so the operator does not need to be conscious of saving the data before the erroneous operation. This also reduces the burden on the operator and improves the operability of the operator.

[Brief explanation of the drawing]

FIG. 1 is a processing flowchart showing one embodiment of the present invention, FIG. 2 is a block diagram showing the overall configuration when the present invention is applied to a computer device, and FIGS. 3 and 4 are display information copying means. FIG. 5 is a flowchart showing an embodiment of display information restoration means; FIG. 6 is a flowchart showing one embodiment of editing processing means;
FIG. 7 is a transition diagram illustrating the storage contents of each buffer memory in one operation of the embodiment. 1: Display device, 4: Edit command input means, return command input means, 9: Display control means, 10: Screen display information storage means, 10a, 10b: Auxiliary screen display information storage means, STM: Display information copying means, SRM :
Display information return means.

Claims (1)

[Scope of Claims] 1. A display device having a display screen that displays a desired image as a whole by a large number of dots, and a storage section corresponding to each dot of the display device, and a display device having a display screen that displays a desired image as a whole by a large number of dots, and a storage section corresponding to each dot of the display device, The storage unit includes a screen buffer memory that stores image information resulting from predetermined editing, and sequentially reads the image information stored in the screen buffer memory, and displays a desired image on the display screen based on the read image information. a display control means for displaying; an auxiliary screen buffer memory provided corresponding to the screen buffer memory; and an instruction to edit the stored contents of the screen buffer memory that stores information of the image displayed on the display screen. editing command input means; image information copying means for copying and storing the stored contents of the screen buffer memory at the relevant time point in the auxiliary screen buffer memory in response to the editing command from the editing command input means; return command input means for requesting copying of image information to a buffer storage section; and display information for copying and storing image information stored in the auxiliary screen buffer memory in the screen buffer memory in response to the return command from the return command input means. A screen editing device comprising a return means.