JPS62202281A - Drawing display device - Google Patents

Abstract

PURPOSE:To execute the present return at a high speed by copying the change contents to the evacuating area of a segment buffer by designating another name at the time of the simulated change, and recording a change history with a host computer when the remaining capacity of the buffer lacks and saving a buffer capacity. CONSTITUTION:At a host computer 1, a present drawing information storing area 3, a drawing information storing area 4 for simulation, the first and second recording parts 61 and 62, a recording processing part 7, a capacity recognizing part 8 and a system selecting part 9 are provided, and at a segment buffer 5 of a graphic display 2, a drawing information storing area 10 and an evacuating area 11 are provided. At the time of the simulated change, the present contents of the change object are first copied to the area 11 by designating another name, the remaining capacity lacks, then, the change history is recorded to the recording part 62 without using the area 11. At the time of the present return, another name is returned to the original position, and based upon the contents of the recording part 61, the drawing information only of the change symmetry is returned to the original position. Thus, the high speed return to the present contents after the simulated change processing can be executed and the capacity of the buffer 5 can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a drawing display device comprising a graphic display device connected to a host computer.

B1 Overview of the Invention The present invention (J, Manage drawing information by host computer - 4) is equipped with a function to display the requested part of the drawing information on the Figure IFe display device and to change the drawing information in a simulated manner. In a drawing display device, when making a simulated change, the current contents to be changed are first given a different name and saved to the save area in the segment buffer, and if the remaining capacity in the segment I buffer is insufficient, The change history is recorded on the host computer without using a save area, and when returning to the current state, the 117i special name is restored to the original, and only the drawing information to be changed in segment I/buffer is restored based on the recorded contents. 4', it is possible to quickly return to the current contents after the simulated change processing, and the capacity of the segment buffer can be saved.

= 3 = C1 Conventional technology and inventions solved), the problem map to be solved (J region's natural conditions, population facilities, and even people 1) It can also express information on human activities such as the economic situation, and it has been used since ancient times. It has been used for administrative purposes.Currently, local governments, fire departments, etc. in the country use it extensively as information that forms the basis of regional planning and regional management.In addition, public companies such as electricity, telephone, and gas ( ', our company's facilities (power line 1N) installed in the area
For planning and management of communication lines, waste pipes), maps depicting the facilities in question are used. These maps and facility maps are drawn as diagrams on paper, and the information drawn is hereinafter referred to as drawing information.

In recent years, attempts have been made to draw these drawings using computers and to process drawing information using computers.

The United States was a pioneer in this, and it has been practiced since the 1960s. Such a computer system 12 is called a drawing information processing system. Currently, it is used by federal, state, and local governments, as well as public companies such as electricity, telephone, and gas companies, and private companies such as marketing companies.

In Japan, research on Noni began later than in the United States, and it has successfully absorbed the technological developments of that time, such as databases, Compico, and Datagraphics, and is now showing its own development. Now, national and local governments.

In public corporations such as fire departments, electricity, telephone, gas, etc.
It can be said that we have finally reached the practical stage.

A feature of the drawing information processing system is that it can connect any graphic display device and display drawings.The host computer manages drawing information and requests drawings according to operator requests. The graphic display device displays the requested portion of the drawing in response to a request from the host computer.In the drawing information processing system, the function of displaying the drawing by the host computer and the graphic display device is controlled. Part B, including the part that implements it, is hereinafter referred to as the drawing display device.

The basic usage of a drawing information processing system is to advance processing through interactive operations with an operator, centering on drawings displayed on a graphic display device.

Therefore, good responsiveness of the drawing display function is strongly required. However, since the host computer performs various general-purpose tasks in addition to drawing display processing, the steady load is heavy, and no performance improvement effect can be expected on the host computer. Rather, the steady-state load tends to increase due to the increase in processing target information and the demand for higher functionality, and the display processing (J burden) on the host computer.1. As the processing response P1 increases, there is a tendency for graphics display devices to become more intelligent. In other words, the graphic display device performs most of the graphic display functions. The graphic display device having the configuration shown in FIG. 9 will be explained in detail below. The definitions of abbreviations used in the following description are as follows.

・l■IT”, , host interface.

-S R segment buffer.

・MTX, Matrix calculator. Matrix operator.

・CLP... Clipping device.

・DDA, digital differential analyzer. Digit-7= Le Hector Enerator.

・F’r3. , , , frame buffer.

・LT... Lookup table. Also known as color map.

・TM, input map. Human powered device.

・VrF, , Video interface.

・TB...table.

・AD,, Address.

-Pn, ..., plane no (n is an integer from 0 to -1) First, the graphic display device 2 has a host interface (HIF) for transmitting and receiving data with the host computer. The HTF receives various display instructions and graphic information from the host computer and transmits them to the display processors (CPl, J). Also, upon request from the host computer, it receives various display-related information from the CP II and sends it to the host computer.

SB is a memory that stores graphic information in descriptive representation (numeric values, symbols). The graphic information is managed in a hierarchical structure. Bottom layer (,1', concrete figure entity (display figure shape 1
position coordinates 2 display colors, etc.). Above these, there is information on various attributes (visible attributes, detected attributes, etc.) for each graphical entity. In addition, the position coordinates of the graphical entity are tube surface -1
This does not directly indicate the position of the pixel III of -, but on a virtual large screen.

From the graphic information stored in this SB, graphic information in a range (a rectangular area determined by world coordinate values) required to be displayed is cut out.

This cutting process involves parallel processing of the displayed figure ((matrix operator (M'r
', R1' A clipping device (c +
, P), etc. are available. Furthermore, the line segment of the graphical information of the cut out descriptive expression is set to ON according to the display position coordinates of the corresponding bit on the frame buffer (FB).
/ Digital differential analyzer that expands to OPF information (
1) DA,) is used and killed.

FB is a memory having at least the number of pixels corresponding to the number of pixels on the CRT screen in one-to-one correspondence with each pixel on the screen of the CRT. In color display, a plurality of memory planes are provided, and column data in which a set of bits corresponding to the same pixel are arranged in each plane is used as the color code of the pixel corresponding to the bit. Furthermore, in recent years,
Lookup table that stores color = 1-t in advance (
LT).

Graphic display devices that have an alias color map and store the above-mentioned hit column data in addresses and 17, LT are now mainstream. With a graphic display device, overlapping priority display is possible.In addition, it is also possible to set priorities for each plane of the 4' FB, and similarly determine which of the shapes to be displayed should be prioritized when they overlap. For each LT address, set the priority order that indicates whether to display it.Next, for each LT address, expand it to the plane with the highest priority among the combinations of planes corresponding to the bit whose contents are turned on. The display color code of the figure is stored in the LT part of the address. Then, figures in the display range are cut out from the SB, and each figure is opened in the plane of the FB corresponding to its priority order. On the other hand, when several figures overlap in each plane, the bit string corresponding to the pixel in the overlapped part is called the address 1. LT is referred to, but the color code of the highest priority display figure when the plane figure sets corresponding to 4+Q address part are overlapped with i'-j'l'-less 1 on 1 hit] is set in advance. Since the information is stored, overlapping priority display is realized. This will be explained in FIG. 1O. There are display figures ・, mu, and ■, and the order of priority for superimposition priority display is from highest to highest. The display color is red,
Green and blue.

The priority order of the FB planes is P2. P.I.
.

The order shall be PO. Display figures・,mu,■ are each P2
．． Assume that the bits are expanded to PI and PO. F B
A set of 4 bits corresponding to one pixel read from each plane of P2. It is assumed that they are arranged in the order of PI and PO, and serve as reference addresses for T and T.

Introducing the overlap of figures in each pixel and the corresponding L T reference address and the corresponding address (7) l
, shows the content. (The address pit t-content indicates that either O/] is acceptable.) <Graphic type or combination><LT reference address><L
T contents>1・,mu, ■ 1××red 2・,mu Same as above 1
-3 ・ Same as above
Same as above 4, Mu, -〇lx Green 5, Mu Same as above -6, ■ 001 Blue 7, No overlap 000 Background color Also, figure types and combinations are shown in the figures. The numbers written on the surface surrounded by the line segments are the numbers assigned to the engravings and combinations of -''1. As a result, a screen (J, as shown in the figure) will be displayed on the screen.

I7T is a table that stores the luminance of the three basic primary colors R, G, and R. R stored at each address
, G, and H, a unique color is expressed.

The video interface (VIF) reads the contents of the FB and assigns the bit string corresponding to each pixel as an address and 1. Thereby, the color coat of LT is read out and the video signal to CR, T (RlG, B, separate.

Combo knot) and synchronization signals to the CRT (vertical synchronization signal/VD, horizontal synchronization signal HD)
do something that will cause it to occur. The operation of these 1 and others is CP
It is independent from TJ control and always executes at high speed and cyclically. The mechanism up to video signal generation is explained first.
Explain using Figure 1. V I P is the bit address (F
BA, D) are generated. As a result, the read bit contents are placed at respective predetermined positions to create a LT reference address. This T, corresponds to the T reference address, or the contents of T are R, G, l1
Read to l- position. The read contents are sent to the DA converter. Here, 1) -A conversion is performed to generate n, G, and B video signals respectively. The following process 1- is performed one after another in the order in which the pixels are arranged.

These (') are executed super-fast and cyclically, so
When viewed by humans, it appears as a single screen, aided by the afterimage phenomenon.

CR'r'' performs refresh drawing on the rask scan display method.Only, the R, G, and T3 video signals for each pixel are output (1) 12 emitting a beam to a pixel position on the phosphor screen;
Various colors are displayed by combining the colors of R, G, and B fluorescent points that emit light at each brightness. Furthermore, the designation of pixels, that is, the radiation position of the beam, is controlled by a horizontal synchronization signal and a vertical synchronization signal. In other words, the electronic beam 1 is scanned horizontally from the top left of the screen, and the required number of scanning lines are sequentially scanned to the bottom right.
It is made 30 to 60 times per second. A value of 30 to 60 times (called the J1 vertical scanning frequency (refresh rate)) is generally set to a value close to the lower limit within a range that does not cause flickering.

CP [J is for analyzing and executing human information from the host computer and IM. However, most of the specific processing is performed by each dedicated processor (MTX, CI, P, VIP, etc.), and it is often the case that they are actually controlled.

The human power device (rM) is used by an operator to manually manipulate various information on the graphic display device. There are many different types available depending on the purpose. As a standard monk, there is Gibaud. Devices for manually inputting coordinate values include digitizers, tablets, and the like.

In addition, there are devices for moving figures and cursors on the screen (J1 joystick, trackball, etc.).

Now, in the drawing display device composed of the host computer and the graphic display device, the drawing information (1. Managed by the host computer) is multiplexed. In the conventional method, when there is a display request from the operator, the host computer (') cuts out the drawing information of the requested location in the virtual hole drawing and sends it to the figure display device. The graphic display device stores each graphical element of drawing information in the form of a segment in the SB, expands it into bits in the FB, and displays it on the screen.In this method, the connection between the host computer and the graphic display device is It takes a considerable amount of time to transmit the Okawa information and to register the segments in the graphic display device.
It takes a long time from the display request to the display on the screen. As mentioned above, the highest requirement for drawing display devices is good responsiveness, which has been a problem with this system.

Recently, a drawing display device has been configured using a drawing display device having an SB of 200 MB (approximately 4 MB), and the drawing information corresponding to all the drawing information managed by the host computer is transferred to the SR at startup. Register all (7) During operation (J, if there is a display request, a total of 11 hosts () will send instructions for only the range > le to the graphic display device, and the graphic display device will display graphics that correspond to all drawings in A method has been developed in which the graphical information in the requested range is cut out from the information and displayed in the F II by clicking and expanding. Since this is not necessary, any drawing location can be displayed at high speed.A drawing display device with extremely high responsiveness has been realized.

Now, in recent years, in drawing information processing systems, it has been practically desired to have a function of changing drawing information in a simulated manner while viewing it on II. In other words, it is a function of changing the drawing information 12 and restoring it again while visually checking the drawing information on the drawing display device.

In other words, it is a drawing simulation that changes drawing information. For example, in local governments, new roads, water supply, etc.
New construction of public property.

In cases where plans for removal etc. are made on drawings. Similarly, when electric power companies, telephone companies, and gas companies plan the installation or removal of power lines, telephone lines, gas pipes, etc. on drawings. A drawing display device displays the actual construction or removal of roads, water supplies, public facilities, power lines, telephone lines, waste pipes, etc. When the simulation is stopped, the original drawing information is restored so that the current drawing can be displayed.

In the above function, good responsiveness is naturally required in the drawing change process, but responsiveness is also required in the function that can return to the previous drawing information and display it after stopping the simulation. This is because various operations are carried out based on the current drawings, which is a problem that has been made into reality, and if the need arises at any time during the simulation, the current drawings will be displayed. I can't do it (because I can't do it).

For example, when an accident occurs on a power line under the jurisdiction of an electric power company, the company must display current drawings to understand the area of the accident and promptly carry out accident recovery operations. Similarly, if a fire breaks out in the area under its jurisdiction, a fire department must display the current drawings to understand the area where the fire occurred and promptly rush to the scene to extinguish the fire. Furthermore, even in cases where there is no urgency, priority is given to tasks that are executed based on current drawing information. Current drawings are also frequently used. Therefore, while the simulation is being executed, it is impossible to do so! 1
! It demands that it be restored.

Hereinafter, based on the drawing information that has been changed in a simulated manner, 1) and 3o will be referred to as restoration to the current state.

In this simulated change process, real data is changed for the current drawing information managed within the host computer.
Mauuno is problematic from a data protection perspective. For example, if the host computer goes down during the simulated change process, 1. I can think of a case where the current drawing information remains unchanged.

So if you want to change the mock ('', first the real (current)
Copy the drawing information of 15 to another area in the storage device, copy 1. One possible method would be to perform configuration change processing on the drawing information. During the simulated modification process, no operations are performed on the real drawing information, so complete data protection is ensured. In addition, with this method, when returning to the current state, the simulated drawing information can be discarded as is, and no data manipulation is required, allowing instant return.

Therefore, the responsiveness of the host computer's processing is very good.

However, there is a problem in adopting the above method in a graphic display device that stores all drawing information (graphic information format). That is, the storage area (SR) of the graphic display device for storing drawing information is not very spacious, and it is not possible to secure an area for storing both current drawing information and simulated drawing information.

The storage device of the graphic display device is an IC memory, and at present it is technically difficult and expensive to implement an extremely large capacity device.In contrast, the host computer
By using an auxiliary storage device such as a disk or a virtual storage mechanism, it is possible to have a practically unlimited storage area.

Therefore, while the host computer executes a simulated change process on the simulated drawing information, the only method available for the graphic display device is to directly change the current drawing information. In this case, when returning to the current state, even if the return process on the host computer side can be executed instantaneously, the current drawing information has actually been changed in the graphic display device, so it is not possible to easily return to the current state. In order to return the drawing information stored in the graphic display device to the current one, all the current drawing information managed by the host computer must be re-registered (J) in the same way as when starting up the system. However, this requires a long time to transmit a large amount of information and to process segment registration, and the responsiveness of returning to the current state is extremely poor.

241 The present invention (") was made as a result of examining various methods to solve the problems such as the above, but in order to make it easier to understand the characteristics of the present invention, we have described the present invention. Let me briefly describe the methods considered up to this point.

First of all, for the method considered at the beginning, the host computer (
The current drawing information is to be processed, but at the start of the simulated change process, the current drawing information is stored in a separate area in the host computer, and this is to be processed by the host computer. At the time of simulated change, the change history of the drawing information in the graphic display device is recorded in a recording section set in the host computer, for example, and when returning to the current state, the recorded contents of the recording section are referred to.
Only the changed parts should be returned to the current drawing information. According to this method, compared to registering all of the drawing information in segments again, there is no needless transmission processing or segment registration processing, and it is possible to return to the current state efficiently and in an extremely short time.

By the way, with this method, if there are many changes to the same segment, the change history will be recorded sequentially, but when returning to the current state, the change history will be restored in the reverse order of the recorded order. Because the operation is delayed, the recovery process becomes slower as the amount of change history in the recording section increases.In order to cope with such cases, the above method is taken one step further. Regarding recording, we are considering a method in which only the differences between the current mock drawing and the current drawing are recorded. [-In the case of deletion-1, in order to return to the current contents of the change history in the recording section, perform replacement and registration operations for the segment by referring to them. (Change type 1 - New establishment)
segment ("[delete-)"). ) This operation must be performed by specifying the entire contents of segment I) r(, for example, one color, one position, one color, etc.). II) B operation command (Jl) There are many cases without such a command.

Therefore, there is a large amount of information @ (segment/IDB operation commands) to be transmitted to the graphic display device, and a considerable amount of transmission time is required.

In addition, there are many segment/II) B operation processes within the graphic display device, which requires a considerable amount of processing time. Therefore, this becomes an obstacle to performing the current return processing at high speed.

For these reasons, the inventor ill: Separately set up a save area in the SR (-1, at the time of simulated change, the current content to be changed is copied to the music save area with a different name, and when returning to the current state, the current content to be changed is copied to the save area. In addition to returning the restoration target to the original name,
We are currently considering a method in which segments of drawing information that have been processed up to now and are to be restored in 11 are deleted. In this method, the current state can be restored very quickly since there is no need to perform replacement or registration operations on the segment to be restored.

Now, the drawing information processing system including the drawing display device (",
Usually, during long-term operation, the amount of information to be managed gradually increases. This is because the local industrial/economic environment, social environment, and natural environment develop and change. In such cases, the storage capacity of the system becomes an issue. In other words, is it possible to cope with the increase in the amount of information to be managed? In the case of a host computer, this increase is anticipated at the design stage (it is equipped with a storage device with a capacity of two to one).Also, even if a capacity shortage occurs, it can be dealt with by adding an external storage device. However, (2) it is difficult to deal with this in the case of a graphics display device that stores all drawing information during operation. First, it does not have an external storage device. (External storage devices have poor responsiveness and display problems. (It cannot be used for processing.) As mentioned above, the mounting capacity of IC memory has a certain limit. Therefore, at the system design stage (J), in anticipation of future increases in drawing information, the drawing area that can be managed by the system is determined. death,
Design so that there is plenty of capacity. t7 Therefore, capacity shortage will not occur unless something extraordinary happens. However, considering the cost/performance ratio, it is unthinkable to take too much leeway.

Consider the increase and decrease of segments due to simulated changes when using the save area described in -. For drawing information that is to be replaced or deleted, a new save segment will be created by copying the drawing information immediately before the change.Also, in the case of new installation, a save segment will not be created, but the drawing information will be saved as a segment. A new one will be created.In the case of deletion, even if the number of saved segments increases, the segment will be deleted, so the remaining capacity of Sr3 will not change.In the case of new installation, drawing information that will be newly created in the future will be Since it is designed with this in mind, it can be absorbed using the spare capacity of the SR, and there is almost no problem of insufficient capacity during a simulated change.However, in the case of a replacement, when a simulated change is made, continues to exist, and other new evacuation segments are created, so the remaining capacity of SB...
Make sure to reduce it by 4-ro. Furthermore, the replacement segment is an existing segment, and is not an increase in drawing information in the future. Therefore, J cannot be absorbed by the margin of SB.In the end, it depends on how much you consider to be the saving amount for the replacement segment that occurs during the simulated change in any case at the time of design, but as mentioned above, 1
- Make sure you have enough nails for 4 to 4 minutes.

1- In the situation described below, drawing information tlj due to the new establishment
If the number increases, the number of saved segments due to replacement during simulated changes will be squeezed. That is, as the amount of drawing information increases, there may be a shortage of space for storing saved segments, and it may become impossible to make simulated changes using the saving method. If the evacuation area is insufficient and no, the evacuation segment (
'Either it cannot be stored, or it is possible to replace the segment, so if you force it, you can only continue with the mock change. 1.
However, since the saved segment of the changed segment has not been saved, it is impossible to return to the current state.Also, if you perform a larger number of replacement operations than expected during a simulated change, there is a possibility that the save area will eventually run out. This saving method has a problem in that it becomes impossible to perform simulated changes as the amount of drawing information increases or a huge number of replacement operations are performed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a drawing display device that can quickly return to the current state and save the capacity of the SB.

D Means for Solving Problems The present invention provides a host computer with a current drawing information storage area,
A simulation drawing information storage area in which the current drawing information in this storage area is copied as simulation drawing information, a capacity recognition unit that recognizes whether the remaining capacity of the segment buffer is insufficient, and this capacity recognition unit. A recording method is selected when a capacity shortage is recognized by the segment buffer, and a method selection section that selects the J evacuation method is set up at other times. A save area is provided for copying the current drawing content related to the save figure information 111th name (=t), and furthermore, when the save method is selected, the change history is saved to the host computer, and the change type and the figure information unit to be changed are saved as described above. A first recording section for recording the saved graphic information j11th name and a second recording section for recording the change history of the simulation drawing information at the time of recording method selection are provided.

When the drawing information in the simulation drawing information storage area is changed in response to a simulation change request, it is processed by the host computer at the time of the simulation change process, and when returning to the current state, the drawing information in the simulation drawing information storage area is Referring to the recorded contents of the recording unit No. 1 in 1-, the name of the saved figure information unit of the 91st position of the figure information to be restored in the save area is returned to the original figure information unit name, and the drawing information is stored in the figure display device. In addition to deleting the graphic information unit to be restored in the area, only the drawing information in the drawing information storage area in the graphic display device that has undergone the simulated change is changed to the current drawing information by referring to the recorded contents of the second recording section. return.

F. Embodiment (1) Overall configuration FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. In this embodiment, current drawing information is constantly stored in the host computer 1 and used for actual operation. Current drawing information storage area 3
, a simulation drawing information storage area 4 used when changing the simulation, and two recording sections (
(hereinafter referred to as logs), that is, the first log 6 and the second log
, a recording processing unit 7 that performs recording processing on the recorded contents of the logs 6, , L, a capacity recognition unit 8 that recognizes whether the remaining capacity of the 5r35 is insufficient, and this capacity recognition unit. For example, a method selection section 9 including a method flag is provided to select a recording method when a 4-way shortage is recognized, and select an evacuation method at other times.

Then, the drawing information storage area 1 is displayed in SB5 of the graphic display device 2.
A save area 11 is set up (J.Drawing information storage area 10
is for storing drawing information to be processed by the host computer, and when the host computer 1 performs current business processing, it stores current drawing information, and when performing simulated change processing, it stores simulation drawing information. Store. The save area II is used when the save method is selected by the method selector 9, and saves the current drawing of the graphic information segment changed at the time of simulation change to the segment name given in the drawing information storage area 10. It exists with a different name. In the following, the graphic information segment stored in the save area 11 will be referred to as a save segment. The visibility attribute of the saved segment is set to invisible. This is because even though it is called a save segment, it exists in the same SB as the drawing information segment17, and the content of the save segment = 36- is the segment content that makes up the drawing (located as a symbol, etc. in the drawing), so it is expanded to FB. It is subject to drawing information extraction at the time. 4. In other words, the saved segment, which is the current drawing content, is also displayed during the simulated change process. Since this does not result in a simulated change, the visibility attribute of the saved segment is set to invisible. (Segments whose visibility attribute is invisible are not subject to bit expansion into FB.) In short, the save area does not indicate a continuous address space on the memory in the graphic display device;
This indicates a set of evacuation segments). Just manage.”
For convenience, when the save segment names are assumed to be continuous, they are often numbers, for example.

(2) The management contents of the first log 6 and the function log of the recording processing unit 6 are recorded when the save method is selected, and the change history I of each segment to be managed with this log.
Contents of the record (J, change type, relevant safety member I/name, save segment name).

The change type is between the current mock drawing and the current drawing! ll
3. This is the type of difference regarding the segment to be added, and there are three types: replacement, new creation, and deletion. Replacement means that the contents of the segment, for example, the shape, two colors, nine position coordinates, etc., have been changed from the current one. Newly established indicates that the segment does not exist in the current drawing and is newly registered in the current mock drawing. Delete and (
”, indicating that the segment exists in the current drawing but has been deleted from the current mock drawing.

Segment name is the name of the segment that is subject to change. Zunawa j:), replacement.

This is the name of a newly created or deleted segment. Replacement.

Since the segment name to be deleted exists in the current drawing, the segment name is already (f).
, Norano. (Sefumen targeted for new establishment)・
Since it does not exist in the current drawings, the name of the segment will be newly registered as ``A'', which can be distinguished from those that exist in the drawings and ``log''.

The saved segment name is the name of a segment that has the same content as the content of the current drawing of the segment to be changed.Of course, the segment name is another name.

Now, the purpose of the change history is to return the mock-changed drawing to the current drawing, and for that purpose, the contents of the current drawing before the change are needed.

However, in the simulated drawing, the current content of the segment is lost due to the change. Therefore, the current drawing content is saved in the graphic display device as a save segment. If the change type is "replacement" or "deletion-1", the saved segment is the content of the replaced or deleted segment in the current drawing.

If the change type is "new installation", the segment does not exist in the current drawing, so there is no save segment either.

The recording processing section 7 has the following functions.

That is, first, when a change is made to a certain segment, a search is made to see if any change history regarding the segment has already been recorded in the log 61. Depending on the result, the following processing is performed.

a. If not recorded, record the history of the segment as it is in the log 6 according to the change.

b. If it has already been recorded, check the change type of the change history recorded for the segment, and the processing differs as follows depending on the combination of this and the change type.

A. If the recorded change type is [Replacement - 1, the change is 1 replacement], do nothing. In other words, since the recorded change type is 1 substitution - 1, the segment exists in both the current drawing and the current simulated drawing. Even if you change the content of that segment further, it still exists in the current mock drawing. The only difference is in content compared to the current drawings. Therefore, the change type (J is also [replacement-1), which is the same as the recorded change history.

If the change is [deletion-1], the change type of the recorded item is set to 1-deletion-1. In other words, the recorded history type is “
Permutation -1, so the segment is present in the current drawing. If the segment is now deleted from the mock drawing, the difference between the current mock drawing and the current drawing with respect to the segment is that the segment ) is present in the current drawing but not in the mock drawing. . That is, the change type is 1 deletion - 1. Therefore, the recorded change type regarding the segment is updated from "Replacement-1 to [Deletion 1].

If the change is [-new establishment-1], it does not exist logically. That is, as mentioned above, the segment exists in the current drawing. There is no such thing as a "new establishment".

On the contrary, such changes are not allowed. If the recorded history type is 1 deletion - 1, no changes can be made.1. In this case, the segment I does not exist in the simulated drawing at this point.

Therefore, it is impossible to specify and change a segment that does not exist.Conversely, specifying a segment that does not exist is not allowed.Also, even if the change is [Newly established-1], it is not possible to change it by specifying a segment that does not exist. As mentioned above, the names of the sections that exist in the drawings and "Ig 61" cannot be used.

If the recorded change history type is [Newly established - 1], this does not apply if the change is "replacement". This is because in the current simulation drawing, the segment is
Although the contents may change, the segment continues to exist (1'). However, since the segment was originally newly created,
In the current drawing, ( does not exist. Therefore, the difference between the current mock drawing and the current drawing regarding the segment (J
, it remains "newly established". Therefore, the recorded change history can be left as is.

If the change is "1 deletion", the change history is deleted from log 6. This is because the segment is deleted and no longer exists in the current simulation drawing. However, since the segment in question was originally newly established, is it the current drawing? It doesn't exist here. In other words, the segment does not exist in either the current mock drawing or the current drawing. Therefore, there is no difference between the current mock drawing and the current drawing. Therefore, since there is no need for the change history for this segment, it is deleted from the log 6°.

It is impossible that the change is a new installation. If 1, then the segment was originally newly created, so it is logically incorrect to create a new segment for it. Therefore, such changes are not permitted.

Below 17. Q) "Summary the y-g update method in the table below.

table Registration: To newly record the relevant history in the log.

Update ・Update the type of change that has already been recorded to the relevant number.

History deletion: Deleting the history itself from the log.

- Don't do anything.

−・・In such a case (“impossible”)

If you manage the record contents as described in I- above, even if a specific segment is changed multiple times, the change history will never exceed the code (either an I record or no change history), which will be explained later. In addition to the effects of the present invention, there is an advantage that even if a segment has been changed many times, it can be returned to its current state with one return process or less without affecting the number of changes.

Here, an example of the correspondence between the drawing information and part of the contents of the log 6 is shown in FIG. 2. This drawing is a residential map, and each segment of the house is expressed in one segment.

Changes in the drawing information and log contents of the graphic display device as the simulated change process progresses are shown in (1) to (2). The explanation is below. The numbers in O (''correspond to the figure 4-ro.

(D current drawing information. Only Seg, H house exists. 4
-ru.

Of course nothing is recorded in the log.

■One house was newly built and the drawing information was updated as Seg, A.
Ji is registered]. Since the log does not have any history of changes related to the segment, the change type is newly recorded in the log.

Also, the shapes of the houses in Seg and H have been changed. ``Since there is no change history regarding the segment in 1G, the change history is newly recorded in the log.The log is as shown in the figure.

■The position coordinates and shape of Seg and A have been changed. The change-
47 = Modification type is "replacement". The log has already recorded the change history regarding the segment, and the change type is "new design. Therefore, no log operation is performed according to the log update method described in +'+if.

Also, Seg and R were deleted. The change type is "deletion". The change history regarding the segment has been recorded in the log, and the change type is [Replacement-1]. 3
In L, the change type of the recorded change history is updated to 1 deletion - 1 according to the log update method.

For reference, the current content is shown in the log in the figure.

(3) The management content log 6 of the second log 62 is recorded when a recording method is selected, and the difference between this management and the first log 61 is that the save segment name is replaced with This is to record the current drawing contents. In other words, "Contents of the code for each segment 1.jii", the change type, the name of the segment, and the current drawing content to be changed.Recording of the current drawing content. For example, when performing a replacement, the original current drawing content is recorded; for example, if a new drawing is created, the original drawing content () does not exist, so nothing is recorded.

(4) Operation Next, the operation of the device described in -1- will be described. First, during current operation, the host computer 1 processes the current drawing information in the current drawing information storage area 3, and performs various processes using this information. And simulated dust! When starting the process, the host computer 1 stores the current graphic information in the simulation drawing information storage area 4:IP 17, and makes the simulation drawing information the processing target.

The capacity 174 recognition unit 8 calculates the remaining capacity u1 of the SB5 and also calculates the amount of increase/decrease in the segment to be simulated changed when the evacuation area 11 is used, and compares the calculated remaining capacity with the increase/decrease in the segment amount. and recognizes whether the remaining capacity is insufficient. In other words, if the calculated segment amount is an increment, and the value exceeds the remaining capacity, the increment segment to be changed cannot be stored in S[35, so it is determined that the remaining capacity is insufficient (2, exceeding the remaining capacity Na(
If it is, it will be determined that it can be changed. It should be noted that if the calculated segment capacity is a decrease, there is a shortage of segments ("No. Segments of segments subject to simulated change). The amount increases or decreases in the following cases A to E.

A. In the case of a new installation, increase the number of newly installed segments in the drawing information storage area 611 (drawing area) 10.

B. There is no increase or decrease when a segment with no change history is deleted. The segment is either deleted from the drawing area 10 or copied to the save area 11.

C. Segment with no change history!・In the case of zero-to-zero replacement, the segment to be replaced in the drawing area 10) ・The increase/decrease in weight relative to the previous segment, and the increment of copying the old segment to the save area I+.

If a segment whose change history is new creation or replacement is deleted, the segment in the drawing area 10 will be reduced.

(e) When replacing a segment whose change history is "new creation" or "replacement", the increase/decrease of the segment to be replaced in drawing area 10 with respect to the previous segment.

Here, regarding the calculation of the remaining capacity of SB 5, if the segment (capacity) required to store a certain segment in SB 5 can be calculated accurately, there is no need to ask the graphic display device 2 about the remaining capacity of SI 35. Tomo, SB5
The remaining capacity at that time can be grasped based on the entire capacity of , and the calculated segment l-1, and therefore it can be recognized by calculation whether or not the remaining capacity is insufficient. However, if the amount of segments required to store a certain segment in SB 5 cannot be calculated accurately, an approximate calculation is performed.

For this rough estimate, we found an approximate formula for the 4-7 SB capacity required to store the segment through an experiment (queried the remaining segment capacity after segment registration, and subtracted that value from the remaining segment capacity before registration). Follow along. If the segment capacity calculation is a rough estimate, the graphic display device 2 is inquired about the remaining segment t-i to recognize the exact remaining segment amount. Based on the remaining segment capacity and the calculated segment capacity, the same determination as described in - is made again. This is because if the segment capacity calculation for the change is an approximation, then recognition 1. This is because the remaining segment capacity is also an approximate value as shown by the following formula.

Remaining segment volume/weight - Previous remaining segment capacity - Increase/decrease segment i Approximate value Based on the premise, the estimated value of the segment is based on the 6th rule in the experiment, so the recognized remaining segment volume (') is less, and the actual remaining segment There is a possibility that there are more changes than the recognized value.Therefore, if the exact remaining segment capacity is inquired, recognized, and determined, there is a possibility that simulation execution will be possible.

In this way, when it comes to understanding the remaining segment capacity, if the remaining segment capacity cannot be calculated accurately when changing the remaining segment capacity, it is usually
When it is determined that the capacity is insufficient, it first inquires of the current remaining segment capacity of the graphic display device 2 to determine the exact value 12, and then makes the determination again. By changing the method, it is possible to minimize the time-consuming 110 process of asking the graphic display device for the remaining segments 1-1 and 17, and to perform constant segment change processing at high speed.

Next, when the capacity recognition section 8 recognizes that the remaining capacity of the SB5 is not insufficient (J1 method selection section 9 selects the evacuation method by setting the method flag to [evacuation method - 1).

When the evacuation method is selected, a certain segment (S
eg, T), a search is made to see if any change history related to the segment has already been recorded in the log 61. Depending on the result, the following processing is performed.

a Record 1~ If it is an initial change (see Figure 3), change the simulated drawing in the host computer as requested.

Name the contents of Seg, I to be changed in the garden surface information storage area 10 in the graphic display device S R to the save area 11.
.

, Copy as ■. This Seg,, I or Seg,
This is a save segment that saves the current drawing contents of I.

However, this does not apply if Seg and T are "new installation-1. (If they are new installation-1, they do not exist in the current drawing.) Next, change Seg and T as requested. If it is "new establishment" then Se
g, I are newly established, and if it is "replacement", Seg, T are replaced, and [deletion-1] Seg, I are deleted.

Log 6 shows the relevant change type [replacement/new addition/deletion].

Record the segment name [Seg, I] and the save segment name rseg, J1. As mentioned above,
If Seg, I is newly installed, the save segment name is "None".

The change type, segment name, and save segment name are recorded in log 6.

b. When changing from the 2nd time onwards (Figure 4 (a) ~
(Refer to (1)) The processing differs as follows depending on the combination of the recorded change type and the relevant change type. Please note that any introduction other than the following is logically incorrect and will not be accepted.

A. If the recorded change type is [-new design or [replacement-1] and the change type is "replacement" (see FIG. 4(a)), the simulated drawing information in the host computer 1 is replaced as requested.

The contents of Seg and I of the drawing information in the graphic display device are replaced.

Log operation (do not perform one line. In other words, if the recorded change type of Seg, I is "new installation", Seg, I does not originally exist in the current drawing. Even if the contents of the segment are changed by replacement, It exists in the mock drawing.

The difference between the current drawing and the simulated drawing after the change is that Yanari Seg, T is "new installation - 1, and the contents of log 61 can be left as is. Also, the recorded change type of Seg, I is 1 replacement." Then, even if we further add the permutation to Seg, I, the difference between the current drawing and the simulated drawing is still Seg.
g, 1 substitution of T. In addition, the contents of (J) in the current drawing of Seg■ have been saved as 3eg, , I.

Therefore, no log operation is necessary.

If the recorded change type is [1-replace] and the change type is [
If it is deletion-1 (see FIG. 4(a)), the simulated drawing information in the host computer I is deleted as requested.

The contents of Seg and I of the drawing information in the graphic display device are deleted.

The change type of the log 61 is updated from "1-replace" to "1-delete-1." In other words, 31.1 originally exists in the current drawing because the recorded change type is "1 replacement". If it is deleted from the mock drawing due to the change, the difference between the current mock drawing and the current drawing will be Segment
, I's [deletion-1. Therefore, the change type of the segment in the log 61 is set to [Deletion-1].

In addition, the contents of Seg, (in the current design) are Seg,
, I have already been saved, and there is no need to perform any operation on this 1.

C. If the recorded change type is [new installation] and the change type is 1 deletion I (see Figure 4 (t)), delete the simulated drawing information in the host computer 1 as requested.

Delete the contents of Seg and I of the drawing information in the graphic display device.

The change history of the log 61 is deleted. Zunawachi, Seg
, r k1 Since it was originally newly established, it does not exist in the current design. Due to this change, Seg and I will be deleted from the simulation diagram. Therefore, Seg, ■ does not exist in the current drawing or the current mock drawing, and there is no difference between the two drawings. Therefore, it is necessary to remove the change history regarding Seg, l from the log.

It should be noted that since the save segment for the newly established Seg and I does not originally exist, there is no need to perform any related operations.

Next, when performing the current restoration process, the change history recorded in the log 61 is referred to and the drawing information in the graphic display device is restored to the current content. It differs depending on the recorded change type as follows.

a. When the recorded change type is [Replacement-1 (see FIG. 5), the relevant Seg and T are deleted from the drawing information storage area 8 in the graphic display device. Next, save Seg, ,1 of the corresponding Seg,I
Rename as Seg,T. That is, Seg,,I
Change the name to Seg, I. The visibility attribute of Seg and T is set to visible.

The above deletes the current Seg and T, which have changed from the current contents due to "replacement", and changes the original (current) Seg and I.
Rename the saved Seg,,I which has the contents of S
It is reproduced as eg■.

b. If the recorded change type is 1 new installation (see Figure 6), the relevant Seg, T is the drawing information storage area in the graphic display device.

Delete from 10.

This is because Seg, I is "newly established" and does not originally exist in the current drawing, so delete Seg, [(
1, the segment returns to the current drawing content.

If the C recorded change type is "deletion-1" (see Figure 7), save segment Seg of the relevant Seg, I, and save J to Seg.
, Liné 11 as I.

This is because Seg, T exists in the current drawing but does not exist in the current mock drawing, so the source of Seg, I (
Simply renaming the saved Seg, J, which has the content of the current drawing, and reproducing it as Seg, I, returns the segment to the current drawing content.

Now, in returning to the current state in -I-, if the segment is of the recorded change type [replacement, 1 deletion], it is returned to the current content using lineno. Therefore, there is no transmission processing of segment contents from the host computer to the graphics display device and segment registration operations within the graphics display device, and there is no need for transmission of rename commands and renaming/renaming.
Since only the name change (-1) is performed, the reversal processing time is significantly shortened. I mentioned the segment degree as an example.
Instead of performing this with a single segment, it may be performed with a graphic information unit larger than a medium or (J segment).

Further, when the capacity recognizing section 8 recognizes that there is insufficient old pickle remaining in SR5, the method selecting section 9 selects a recording method by setting the method flag to 1 recording method - 1, for example.

In this case, instead of using the first log 6 and save area 11, as mentioned above, use the second log, and enter the change type, the segment name to be changed, and the name of the change target. Record the contents of the current drawing in the log code 17. When returning to the current state, refer to the recorded contents of log 6 and the drawing information in the current -63= line and simulate 1. to simulate the drawing information in the drawing area 10. Perform the operation to return to the current one.

Of the cases A to O, which are cases of increase/decrease in segment amount due to the simulated changes described above, there are only two cases in which the segment content increases due to the saving method. In other words, a~
Of the above, the segment amount may increase due to A,
If you are 71 years old, you are in the drawing area.1.
Since this is an increment of 1 and is the same as the recording method, it cannot be said that the increase is caused by the evacuation method. In this case, in addition to the increase/decrease in the drawing area, there is an increase in the save area, and this increment in the save area has a large effect on increasing the segment amount. Therefore, if it is determined that execution is not possible in two cases, the simulated change history method is switched to the recording method, and the simulated changes from 1 onwards are performed using the recording method.

If the recording method is used, there is no increment in the save area, only an increase/decrease in the drawing area, so there is a 1-minute possibility that the simulated change can be executed.

In addition, in the evacuation method, if the amount of safety maintenance only in the drawing area increases, that is, the above-mentioned A.

In the case of E, if it is determined that the change cannot be performed, the change cannot be performed even if the recording method is switched.

The recording method is more likely to allow simulated changes than the evacuation method.
The reason for doing so is that in case A, there is no increment in the save area, resulting in a total decrease of the amount of segments in the drawing area; It is only the increase/decrease of . In other words, this is only in the case of new installation without reducing the remaining segment capacity by a large amount, and if another segment is deleted, the remaining segment capacity will increase significantly, which will be canceled out, and normally there will only be a slight increase/decrease due to replacement. There is ample possibility of implementing a simulated change.

F. Effects of the Invention As described above, according to the present invention, ■ Normally, in a simulated change, the current content to be changed is copied to the save area with a different name (-1t), and the restoration target of the area is copied to the original [Return to the name of the graphic]]7), even if there are many graphic information units to be restored, the transmission process to the graphic display device and the segment operation within the graphic display device are much less, and therefore the simulation Restoration to the current state after change processing can be performed very quickly.

■If the remaining segment capacity is insufficient, the recording method is switched, so configuration changes can be continued. Moreover, with this recording method, it is only necessary to perform data manipulation to return to the original (current drawing) only for the segments recorded in the log. ), register all the drawing information as segments again 1. In addition, compared to 1, the unnecessary transmission processing,
There is no segment registration process, and it can be restored efficiently and in an extremely short time.

■ Due to the effect of I-note ■, the segment capacity of the evacuation area was saved to the extent that the effect of -note ■ is not impaired.
Easy to design and good cost/performance.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the overall structure of the present invention, Fig. 2 is a correspondence diagram showing the correspondence between drawing information and the contents of the recording section, and Figs. 3 and 4 (A) to (T) are simulations. An explanatory diagram showing the state of the change processing, FIGS. 5 to 7 are explanatory diagrams each showing the state of the current return processing, FIG. 8 is a block diagram showing the overall configuration of the graphic display device, and FIG. 9 is a diagram showing the graphic superimposition. FIG. 10 is a block diagram showing the mechanism of video signal generation. 1 host computer, 2... graphic display device, 3 - current drawing information storage area, 4 - simulation drawing information storage area, 5...
- Segment buffer, 6I... First recording section, 62.
... second recording section, 7. recording processing section, 8. capacity recognition section, 9 method selection section, jO.. drawing information storage area, 11.
・Evacuation area. An explanatory diagram of atoms with a mixture of adventurer patterns

Claims (1)

[Claims] Drawing information to be processed by a host computer is registered as a segment in a drawing information storage area in a segment buffer of a graphics display device, and graphics information in a display range instructed by the host computer is stored in the storage area. In a drawing display device that cuts out drawing information and displays it on a screen, the host computer includes a current drawing information storage area and a simulation drawing information storage area in which the current drawing information in this storage area is copied as simulation drawing information. a capacity recognition section that recognizes whether or not the remaining capacity of the segment buffer is insufficient; and a method selection section that selects a recording method when the capacity recognition section recognizes that there is insufficient capacity, and selects an evacuation method at other times. and providing a save area in the segment buffer for copying the current drawing content related to the figure information unit to be simulated changed when selecting the save method, with a save figure information unit name attached thereto, and further providing in the host computer, a first recording unit that records a change history based on a change type and the save graphic information unit name of a graphic information unit to be changed when a save method is selected; and a first recording unit that records a change history of the simulation drawing information when a record method is selected; The drawing information in the simulation drawing information storage area is changed in response to a simulation change request, is processed by the host computer during the simulation change process, and is processed by the host computer when returning to the current state. Referring to the recorded contents of the first recording unit, return the saved graphic information unit name of the graphic information unit to be restored in the save area to the original graphic information unit name, and store the drawing information in the graphic display device. In addition to deleting the graphic information unit to be restored in the area, only the drawing information in the drawing information storage area in the graphic display device that has undergone the simulated change is changed to the current drawing information by referring to the recorded contents of the second recording section. A drawing display device characterized by a return function.