JP2000148121A - Display control device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rapid display control device of redrawing processing. SOLUTION: An extraction means 6 detects that a changing command for changing a designated display region from the mapped state to the unmapped state is issued from a task T. After detecting the changing command, the extraction means 6 extracts a display region where redrawing is required based on superimposed relations among each display region stored in a superimposed- relation storing means 8. A drawing means 10 executes redrawing of the extracted display region by referring the definition stored in a display region storing means 4. A the superimposed relations among each display region are stored beforehand and, when a changing command is given, a display region where redrawing is required is extracted based on the stored superimposed relations, processing of redrawing becomes rapid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to display control, and more particularly to speeding up the drawing of a plurality of superimposed display areas.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 62-79576 discloses display control of a plurality of overlapping windows. When a certain window changes from the map state to the unmapped state while displaying the overlapping windows, it is necessary to redraw the window hidden by the window. In the technology of this publication, when redrawing a hidden window,
The speed of the drawing process is increased by not redrawing the portion concealed by the other windows.

[0003]

However, in order to redraw a window that has been hidden by a window that has changed from the mapped state to the unmapped state, it is necessary to know which window is hidden. To do so, the drawing program checks all windows for whether the unmapped window area overlaps with other window areas and whether other windows are in the mapped state. Must. For this reason, there is a problem that it takes time to find a window that needs to be redrawn, and as a result, it takes time until the redrawing is performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display control apparatus and method which solves the above-mentioned problems and speeds up a redrawing process when a window changes to a mapped state or an unmapped state. .

[0005]

According to the present invention, there is provided a display control apparatus comprising: a display area storing means for storing a definition of a plurality of display areas; and a superimposing means for storing an overlapping relation between the display areas. When there is an instruction to change the display state (map state or unmapped state) of the display area from the relation storage means and the processing unit, the superposition relation stored in the superposition relation storage means and the display area stored in the display area storage means Extraction means for extracting a display area requiring redrawing by referring to the definition of

[0006] Since the superposition relationship between the display areas is stored, when the display state (map or unmap state) of a certain display area is changed, it is possible to quickly determine which display area should be redrawn. Can be obtained. Therefore, the redrawing process can be performed quickly.

According to a third aspect of the present invention, the display control device includes a display state storing means for storing whether each display area is in a map state or an unmapped state. Therefore, the display state of each display area can be easily acquired when extracting the display area that needs to be redrawn.

According to a fourth aspect of the present invention, the superimposition relation stored in the superimposition relation storage means can be set or changed depending on the processing unit. Therefore,
A desired superposition relationship can be set for each processing unit.
Further, by changing the superimposition relation, it is possible to obtain the superposition relation of the display area according to the processing content of the processing unit.

According to a fifth aspect of the present invention, the display control device includes a superimposition relation updating means for updating the superposition relation of the superposition relation storage means based on a predetermined priority when a new display area is instructed from the processing unit. ing. Therefore, even when a new display area is generated, the superimposition relationship of each display area including the new display area is updated and stored.

According to a sixth aspect of the present invention, the display control device updates the superposition relation of the superposition relation storage means based on a predetermined priority when there is an instruction to change the position or size of the display area from the processing unit. Means. Therefore,
Even when the display area is moved or the size is changed, the superimposition relationship after the change is updated and stored.

The display control device according to claim 7 is characterized in that the processing unit gives a priority. Therefore, the superposition relation of the display areas can be determined from the processing unit side.

[0012] The display control device according to claim 8 is based on a rule predetermined according to the position and size of the display area.
It is characterized in that the superposition relation updating means determines the priority. Therefore, it is possible to determine the superimposition relationship of each display area without being aware of the priority on the processing unit side.

According to a display control method of the present invention, a superposition relationship between a plurality of display areas is stored, and when there is an instruction to change any of the display areas from a map state to an unmapped state by a processing unit, the stored relation is stored. It is characterized in that a display area requiring redrawing is extracted and redrawn with reference to the superimposition relationship.

Since the superposition relationship between the display areas is stored, when the display state (map or unmap state) of a certain display area is changed, it is possible to quickly determine which display area should be redrawn. Can be obtained. Therefore, the redrawing process can be performed quickly.

In the present invention, a "processing unit" refers to a group of processes for obtaining some effect. One processing unit may be constituted by one task, but may include two or more tasks.

"Extracting means" refers to means for extracting a display area requiring redrawing at least by referring to the superimposition relationship. In the embodiment, this is achieved by the CPU and the program shown in FIG. 7, FIG. 9 or FIG. 16 to FIG.

The "position of the display area" is a concept including not only the position of the display area on the screen with respect to the XY coordinates but also the position of the display area with respect to the vertical direction (which is displayed with priority).

The "computer" refers to a device that performs processing in accordance with a program, and includes a CPU, an MPU, and the like incorporated in devices such as a personal computer and a TV.
This is a concept including PU.

"Recording medium on which the program is recorded"
A recording medium such as a ROM, a RAM, a flexible disk, a CD-ROM, a memory card, a hard disk, or the like on which a program is recorded. A CD-RO recording a program to be executed after being installed on a hard disk or the like, as well as a recording medium such as a hard disk connected to the CPU and directly executing the recorded program.
This is a concept including a recording medium such as M. Furthermore, the programs referred to here include not only programs that can be directly executed, but also programs in a source format, compressed programs, encrypted programs, and the like.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIG. 1 shows an overall configuration of a display control device 2 according to an embodiment of the present invention. The display control device 2 includes extraction means 6,
A superimposition relation storage unit 8 is provided. Display area storage means 4
Stores definitions of a plurality of display areas set on the screen of the display device 12. The superimposition relation storage means 8 stores a superposition relation indicating which display area overlaps with which display area among the plurality of defined display areas, and which is displayed preferentially in the overlapped portion. I have.
The task T designates a display area and gives data to be displayed in the display area to the drawing means 10. Also,
The task T issues a command as to whether the display area is to be set to the mapped state or the unmapped state. In addition,
The task T can give data not only to the display area in the map state but also to the display area in the unmapped state. Upon receiving the display command, the drawing unit 10 refers to the definition of the display area storage unit 4 and performs drawing on the display device 12.

The extraction means 6 detects that the task T issues a change instruction to change the designated display area from the map state to the unmapped state. The extraction unit 6 that has detected the change command extracts a display area that needs to be redrawn based on the superimposition relation between the display areas stored in the superimposition relation storage unit 8. The drawing means 10 refers to the definition stored in the display area storage means 4 and redraws the extracted display area.

As described above, the superimposition relation between the display areas is stored in advance, and when a change instruction is given, the display area that needs to be redrawn is extracted based on the stored superimposition relation. The redrawing process is quicker.

FIG. 2 shows a hardware configuration when the embodiment shown in FIG. 1 is realized using a CPU. A display unit 18 such as a cathode ray tube (CRT) or a liquid crystal display (LCD), a work memory 14 functioning as a work area, and a ROM 16 are connected to the CPU 20 as a processing unit. Note that both the work memory 14 and the ROM 16 are only examples of specific examples of the storage device. The ROM 16 stores a drawing program, a display control program, and a display area definition table corresponding to the display area storage unit. The work memory 14 including a rewritable RAM and the like stores a table indicating a superimposition relationship and a display state. The superimposition relation part of this table corresponds to the superposition relation storage means, and the display state part corresponds to the display state storage means. The task T for performing the display process is executed by the CPU 20.
May be executed by another CPU or another CPU.
Or the like.

FIG. 3 shows a definition example of a display area in the display device 18. In this embodiment, four display areas E1
To E4 are defined. As shown in FIG. 4, a display area definition table (display area storage means) indicating the definition of each of the display areas E1 to E4 is recorded in the ROM 16. In this embodiment, the upper left corner of the screen is represented by coordinates (0, 0).
, And X represents the horizontal and Y represents the vertical, and the coordinates are represented by display dots. The lower right corner of the screen is (319, 239).

In FIG. 4, each display area is represented by X, Y,
It is defined by W and H. X is the X coordinate of the origin (ie, the upper left corner) of the display area, Y is the Y coordinate of the origin (ie, the upper left corner) of the display area, W is the width of the display area in the X-axis direction, and H is the width of the display area. The height in the Y-axis direction. The display area definition table may be stored in the work memory 14.

FIG. 5 shows a table of superimposition relations and display states (superimposition relation storage means and display state storage means) recorded in the work memory 14. Each display area E1, E
A display area hidden by the area is indicated for each of 2, E3, and E4. In FIG. 5, there is no display area hidden by the display area E1, the display area E2 is hidden by the display area E2, the display area E1 is hidden by the display area E3, and the display area E2 is hidden by the display area E4. . Further, each of the display areas E1 to E4 is
An item of “state” for storing whether the apparatus is in the unmapped state or the mapped state is provided. FIG. 5 shows that the display state is the map state except for the display area E3.

In this embodiment, both the superimposition relation and the display state are described in the table shown in FIG. 5, but a superposition relation table and a display state table may be provided respectively.

Here, the map state and the unmapped state will be described. The map state is a state in which the display area is to be displayed. Therefore, if the display area in the map state is not hidden by other display areas, the display device 12
Will be displayed. Also, the unmapped state is
This is a state in which the display area is not displayed. Therefore, the display area is not displayed on the display device 12.
An instruction is given from the task T to set each display area to the mapped state or the unmapped state. When the display area that has hidden the other display area changes from the mapped state to the unmapped state, the hidden part of the other display area should be displayed.

In this embodiment, as shown in FIG. 6A,
The display area 24 hidden by the other display area 22 is not displayed at all. However, as another embodiment, as shown in FIG. 6B, a portion of the display area 24 overlapping the display area 22 may be displayed thinly (so-called alpha blending). As shown in FIG. 6C, in the display area 24 overlapping the display area 22, the portion where the display content of the display area 22 exists hides the display of the area 24, and the portion where the display content does not exist displays the area 24. You may make it. That is, the display area 2
Display area 2 with background 2 transparent
4 may be superimposed. In the present invention, as illustrated in FIGS. 6A, 6B, and 6C, the display area 22 is displayed by the display area 22 so that the display area 22 is visually positioned above the display area 24. Hide ".

FIG. 7 shows a flowchart of the display control program recorded in the ROM 16. Hereinafter, the redrawing process will be described with reference to this flowchart. Here, it is assumed that the display area is defined as shown in FIGS. 3 and 4, and the superimposition relationship is defined as shown in FIG. It is assumed that the current display state of each area is as shown in FIG. That is, it is assumed that the display areas E1, E2, and E4 are displayed as shown in FIG.

In this embodiment, a display area included in another display area can be in a map state only when another display area is in a map state. The display area included in the other display area is displayed so as to hide the other display area.

In the display state as shown in FIG.
It is assumed that a change command to make the display area E4 unmapped is issued to the drawing program. In the prior art, the drawing program that receives such a change instruction examines the degree of overlap of each display area one by one, determines the area to be redrawn, and then performs redrawing as described above. Was. In this embodiment, the drawing program is:
Even if a change command for changing a certain display area from the map state to the unmapped state is issued, the process of searching for the area to be redrawn is not performed. As described below, the display control program (FIG. 7) receives a display area that requires redrawing and performs redrawing.

When a change command for changing from the unmapped state to the mapped state is issued, the drawing program performs a redrawing process. In this case, it is clear that the display area in the map state can be redrawn without receiving an instruction from the display control program.

When a change command for changing the display area E4 to the unmapped state is issued from the task T to the drawing program, the CPU 20 detects this and starts the display control program shown in FIG. 7 (step S1). Next, CPU2
0 specifies which display area has been changed to the unmapped state (step S2). Here, the display area E4 is specified. Next, by referring to the table of the superimposition relation and the display state, it is acquired that the display area hidden by the display area E4 is E2 (step S3).

Thereafter, in step S4, the drawing program is instructed to redraw the hidden display area E2. In response to this instruction, the drawing program searches the display area E4 that has hidden the display area E2, and redraws the display area E2 for the display area E4. For the definition of the display area E4, refer to the display area table of FIG. As described above, the drawing program can perform redrawing only by searching for the display area E4 that has hidden the display area E2, and thus the processing is speeded up.

In this embodiment, it is assumed that a display state change command is not issued almost simultaneously and continuously for two or more display areas, but is displayed almost simultaneously and continuously for two or more display areas. A state change command may be issued. In this case, as shown in FIG.
It is necessary to determine whether or not the hidden display area is in a map state.

For example, in the example of FIG.
Suppose that both 2 and E4 are in the unmapped state. In this case, following step S3, the hidden display area E
It is determined whether or not 2 is in the unmapped state (step S5). If the display area E2 is in the unmapped state, the process returns to step S3. In step S3, the display area E1 hidden by the display area E2 is acquired with reference to the table of FIG. Since the display area E1 is in the map state, the process proceeds from step S5 to S4, and an instruction is given to redraw the display area E1.

In the above embodiment, the change command from the task T is given to the drawing program, and the display control program detects the change command by monitoring that such a change command has been issued. I have to. However, the drawing program may notify the display control program that a change command has been issued. Further, a change command may be given from the task T to the display control program, and the display control program may give a change command to the drawing program. The same applies to the following embodiments.

In the above embodiment, the display control program instructs the drawing program to indicate a display area that requires redrawing. However, the display control program may refer to the display area definition table to instruct the drawing program which part of the display area needs to be redrawn. In the above example, the drawing program is instructed to redraw the display area E2 in the range from (20, 20) to (59, 59) (that is, the range of the display area E4).
Thereby, the redrawing process can be further speeded up.

In each of the above embodiments, the display control program does not perform redrawing. However, a part or all of the functions of the drawing program may be fetched and executed by the display control program. The same applies to the following embodiments.

In the above embodiment, the superimposition relation is fixed as a predetermined one. However, the superposition relation may be given before the task T performs processing. In this way, when there are a plurality of tasks T, it is possible to set an appropriate superimposition relationship according to each task. Further, it is possible to set a superimposition relation corresponding to the processing from the task T side every time the processing is performed.

2. Second Embodiment FIG. 10 shows a display control device 2 according to an embodiment of the present invention.
1 shows the entire configuration. In this embodiment, task T
, A new display area can be generated and destroyed, and the position and size of the display area can be changed.

When an instruction to create a new display area (or an instruction to destroy an existing display area) is issued from the task T to the drawing means 10, the superimposition relation updating means 26 detects this. The drawing unit 10 may notify the superimposition relation updating unit 26 that a new display region has been generated (or that the display region will be destroyed). Alternatively, the task T gives an instruction to generate a new display area (or an instruction to destroy the display area) to the superimposition relation updating means 26,
This may be provided by the superimposition relation updating means 26 to the drawing means 10.

When the generation of a new display area is detected, the superposition relation updating means 26 determines a predetermined display area based on the definition of each current display area stored in the display area storage means 4 and the definition of the new display area. The superposition relation of the superposition relation storage means 8 is updated according to the priority. Further, the definition of the newly generated display area is added to the display area storage unit 4.

When the destruction of the existing display area is detected, the superposition relation updating means 26 updates the superposition relation excluding the destructed display area according to a predetermined priority.
It is stored in the superimposition relation storage means 8. Further, the definition of the destroyed display area is deleted from the display area storage means 4.

As described above, even when the display area is generated or destroyed, the superposition relationship can be updated.

The hardware configuration when the display control device 2 of FIG. 10 is realized using a CPU is the same as that shown in FIG. Note that a display control program is recorded in the ROM 16. It is also assumed that the work memory 14 stores a display area table as shown in FIG. 4 and a table of superimposition relation and display state as shown in FIG.

In this state, the task T is
The processing when a command to generate a new display area E5 is given to 0 will be described. Here, a new display area E
5 indicates that X, Y, W, and H are 130, 10, and 3, respectively.
0 and 30.

FIG. 11 is a flowchart showing a part of the display control program recorded in the ROM 16 for updating the superposition relation. For the redraw instruction part,
This is the same as the embodiment.

When a new display area is created by the task T or the existing display area is destroyed, the CPU 2
0 detects this (step S11). At the same time, the definition of the generated or destroyed display area is obtained from a window management unit (such as a window manager) that manages the display area. Next, the CPU 20 determines whether it is generation or destruction (step S12).

Here, since the display area E5 is newly generated, the process proceeds to step S13, and the definition of the display area E5 is added to the display area table (step S13). As a result, the contents of the display area table are updated as shown in FIG.

Next, including this new display area E5,
The superposition relation is recalculated (step S14). In this embodiment, when two or more areas overlap, a superposition relationship is calculated by assigning priorities so that a large area is hidden by a small area. Here, the newly generated display area E5 and the display area E3 overlap and the display area E5 is smaller, so that the display area E3 is hidden by the display area E5. That is, FIG.
As shown in FIG. 3, the table of the superimposition relation and the display state is updated (step S15).

When the area is destroyed, the destroyed display area is deleted from the display area table (step S16). Subsequently, except for the display area, the superposition relation is recalculated in accordance with the predetermined rule (step S1).
7), the table of the superimposition relation and the display state is updated (step S15).

In the above description, the priorities are assigned according to a predetermined rule and the superposition relation is recalculated. However, the priority order of each display area is notified from the task T, and when two or more display areas overlap, the higher the priority order, the higher the priority (the higher the priority area, the lower the area). Is hidden),
The superposition relationship may be determined. When display areas having the same priority overlap, the superimposition relation may be determined in accordance with the order of generation.

Instead of the above, when the task T generates a new display area, which display area the new display area hides, or which display area the new display area hides is displayed. May be notified from the task T.

Next, a case where the task T gives the drawing means 10 an instruction to change the position and size of the display area will be described. FIG. 14 is a flowchart illustrating a part of the display control program related to the update of the superimposition relation when the above change is made.

Here, a description will be given assuming that the task T has instructed the display area E2 to be displayed at the top in the states shown in FIGS. 12 and 13 (change of position in the vertical relationship). When an instruction to change the position and size of the display area is given to the drawing unit 10 by the task T, the CPU 20 detects this (step S21).
At the same time, the contents of the change are acquired from the window management unit (window manager or the like). Here, a change that the display area E2 is displayed at the top (change of the priority order)
Get that.

Next, in step S22, it is determined whether or not the position is changed in the vertical relationship. In this case, since the position is changed in the vertical relationship, step S
Go to 25. In step S25, first, a display area overlapping the display area whose position has been changed is acquired with reference to the display area definition table. Here, the display area E2
Are obtained, the display areas E1 and E4 overlapping with. Next, the superposition relation is recalculated based on the change instruction, and the table of the superposition relation and the display state is updated. Here, the display areas E1 and E4 are hidden by the display area E2. Further, the display area E1 is hidden by the display area E4. FIG. 15 shows a table of the superimposition relationship and the display state updated in this manner. In the above case, since the definition of the display area is not changed, the contents of the display area definition table remain as shown in FIG.

When the left and right positions and the size of the display area are changed (that is, when the X and Y coordinates are changed)
Goes from step S22 to step S23. In step S23, the definition of the changed display area in the display area definition table is corrected. Next, it is determined whether or not there is a change in the superimposition relationship with a change in the left and right positions and the size of the display area (step S24). For example, if two overlapping display areas no longer overlap due to a change in position or size, or if two non-overlapping display areas overlap, a change occurs in the overlapping relationship. Further, when the superimposition relation is defined according to a predetermined rule, the superposition relation may be changed by changing the size.

In step S24, if there is no change in the superimposition relation, the processing in FIG. 14 ends. If there is a change in the superimposition relation, the table of the superposition relation and the display state is updated with the recalculated superposition relation (step S2).
5).

3. Third Embodiment The overall configuration of the third embodiment is the same as the first embodiment and the second embodiment. However, in this embodiment, the extraction means 6 indicates the display area to be redrawn not only in the case of the change from the map to the unmap, but also in the case of the change from the unmap to the map. I have.

The display control device 2 according to this embodiment is
The hardware configuration realized using the PU is the same as that shown in FIG. FIG. 16 and FIG.
2 is a flowchart showing a part of the redraw instruction process of the display control program recorded in FIG.

In the first embodiment, the display area in the map state is not displayed on the unmapped state. In this embodiment, the display area is freely displayed without such restrictions. Shall be.

When an instruction to change the display state is issued from the task T, the CPU 20 detects this (step S3).
1) Acquire the display area whose display state has been changed (step S32). Next, step S33
The content of the display change is "change from map to unmap" or "change from unmap to map"
Is determined.

In the case of "change from map to unmap", it is determined whether there is a display area hidden by the unmapped display area (step S).
34). If there is no such display area, FIG.
The processing of 7 is ended. If there is such a display area, it is determined whether or not the display area is in the map state with reference to the table of the superimposition relation and the display state (step S35). If it is in the unmapped state, the processing in FIGS. 16 and 17 is terminated. If it is in the map state, a redrawing range is set for the unmapped display area so that the hidden display area is redrawn (step S3).
6). This processing can be performed by referring to the display area definition table and the table of the superimposition relation and the display state.

For example, as shown in FIG.
If the display area 60 is unmapped in a state where the display area 60 is displayed on 0, the display area 70 in the range of the display area 60 (that is, the range from X1, Y1 to X2, Y2).
Is set to be redrawn.

Next, in step S37, it is determined whether or not there is a display area that hides the unmapped display area. If there is no such display area, a redraw instruction is issued in step S43. If there is such a hidden display area, it is determined whether or not the display area is in a map state (step S38). If it is not in the map state, a redraw instruction is issued in step S43. If it is in the map state, the range of the hidden display area is excluded from the set range of the redrawing to set the range of the redrawing (step S39). Thereafter, in step S43, an instruction for redrawing is issued.

For example, as shown in FIG.
In the case where the display area 80 is displayed on the unmapped display area 60 in FIG. 8A, the redrawing range is changed from the range of the display area 60 to the range of the display area 80 (that is, from X3, Y3 to X4, Y4 range).

If there is an instruction to change from an unmap to a map, steps S33 to S40 are performed.
Proceed to. In steps S40 and S41, it is determined whether or not there is a display area that is a display area that hides the map display area and is in a map state. If there is no such display area, the map display area is set as a redrawing range (step S44), and a redrawing instruction is given (step S43). If there is such a display area to be hidden, the display area that has been mapped is set as a range for redrawing except for the range of the display area to be hidden (step S42), and an instruction for redrawing is given (step S42). S43).

As described above, according to this embodiment, the restrictions on the display of the display area as described in the first embodiment (the display area included in another display area is different from the other display areas). Even if there is no restriction that the area can be in the map state only when the area is in the map state, the display area to be redrawn can be appropriately specified. In addition, since not only which display area should be redrawn but also which area should be redrawn is specified, the redrawing process is quicker.

The sign control device according to the present invention is applied to a case where a plurality of screens are displayed (for example, an electronic program guide) in a satellite TV set, a set-top box, a terrestrial broadcast TV set, and the like. Can be.

The present invention can be applied to a case where map information and Internet information are displayed in a car navigation system.

Further, the present invention can be applied to a case where image information and character information such as a menu are displayed when authoring an image in a DVD system.

Further, the present invention can be used for displaying a screen of a personal computer. This is particularly effective in a computer for factory automation (FA) when the user cannot change the form of screen display.

In the above embodiments, each means in the overall configuration diagram is realized by using a CPU, but a part or all of them may be configured by hardware logic.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a display control device according to an embodiment of the present invention.

FIG. 2 is a hardware configuration when the device shown in FIG. 1 is realized using a CPU.

FIG. 3 is a definition example of a display area.

FIG. 4 is a diagram showing an example of contents of a display area table.

FIG. 5 is a diagram illustrating an example of contents of a table of a superimposition relation and a display state.

FIG. 6 is a diagram illustrating a state in which a lower display area is hidden by an upper display area.

FIG. 7 is a flowchart of a display control program.

FIG. 8 is a diagram showing a state in which a plurality of display areas are displayed so as to overlap vertically.

FIG. 9 is a flowchart of a display control program.

FIG. 10 is a diagram illustrating an overall configuration of a display control device according to a second embodiment.

FIG. 11 is a flowchart illustrating a part of updating a superimposition relation in the display control program.

FIG. 12 is a diagram showing an example of the contents of a display area table.

FIG. 13 is a diagram illustrating an example of the contents of a table of a superimposition relationship and a display state.

FIG. 14 is a flowchart illustrating a part of updating a superimposition relation in the display control program.

FIG. 15 is a diagram illustrating an example of contents of a table of a superimposition relationship and a display state.

FIG. 16 is a flowchart of a display control program.

FIG. 17 is a flowchart of a display control program.

FIG. 18 is a diagram for explaining an area that requires redrawing.

[Explanation of symbols]

 T: Task 4: Display area storage means 6: Extraction means 8: Superimposition relation storage means 10: Drawing means 12: Display device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Goichi Yasutake 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Terms (reference) 5C025 BA28 CA02 CA09 CB09 DA01 DA04 5C058 AA01 AA06 BA18 BA21 BA24 BB11 BB14 5C082 BA12 BB13 BB15 BB25 CA63 CB01 CB06 DA54 DA87 MM02

Claims (11)

[Claims] 1. A display control device for controlling a plurality of display areas on a display device in response to a display processing request from a processing unit, comprising: superimposition relation storage means for storing a superposition relation between the display areas; When there is an instruction to change any of the display areas from the mapped state to the unmapped state, the display area requiring redrawing is extracted by referring to the superimposition relation stored in the superimposition relation storage means. A display control device comprising: extracting means; 2. A display control device for controlling a plurality of display areas on a display device in response to a display processing request from a processing unit, comprising: a display area storing means for storing definitions of the plurality of display areas; A superimposition relation storing means for storing the superposition relation between the display areas; and a superposition relation stored in the superposition relation storage means when there is a change instruction to change one of the display areas to a map state or an unmapped state from a processing unit. Extracting means for extracting a display area requiring re-drawing with reference to a drawing means for re-drawing the display area extracted by the extracting means with reference to the definition stored in the display area storing means. A display control device comprising: 3. The display control device according to claim 1, further comprising display state storage means for storing a display state of each display area in a mapped state or an unmapped state. And extracting a display area requiring redrawing by referring to a display state stored in a display state storage means. 4. The display control device according to claim 1, wherein the superimposition relation stored in the superposition relation storage means is configured to be set or changed by a processing unit. . 5. The display control device according to claim 1, further comprising, when an instruction to generate a new display area is issued from the processing unit, the superimposition relation of the superimposition relation storage means is determined based on a predetermined priority. A superimposition relation updating means for updating is provided. 6. The display control device according to claim 1, further comprising, when an instruction to change the position or size of the display area is issued from the processing unit, based on a predetermined priority order. A superimposition relation updating means for updating the superposition relation is provided. 7. The display control device according to claim 5, wherein the priority is given by a processing unit. 8. The display control device according to claim 5, wherein the priority is determined by the superimposition relation updating means based on a rule predetermined according to the position and size of the display area. Features. 9. A display control device for controlling a plurality of display areas on a display device in response to a display processing request from a processing unit, comprising: a processing unit connected to the display device; A storage unit in which a control program is stored. The storage unit further stores a superimposition relationship between the plurality of display regions. When there is an instruction to change from the map state to the unmapped state, the processing unit performs processing for extracting the display area requiring redrawing and redrawing by referring to the superimposition relation stored in the storage unit. It is characterized by being performed. 10. A recording medium in which a display control program for causing a computer having a display device and a storage device to perform display control by a processing unit is recorded. When there is an instruction to change the display area to the unmapped state, the computer refers to the superimposition relationship between the display areas stored in the storage device, extracts the display area requiring redrawing, and redraws the image. Recording medium on which a display control program to be performed by a user is recorded. 11. Upon receiving a display processing request from a processing unit,
A display control method for controlling display in a plurality of display areas in a display device, wherein a superimposition relationship between the display areas is stored, and a processing unit changes one of the display areas from a map state to an unmapped state, With reference to the stored superposition relationship,
Extracting a display area that requires redrawing and redrawing the display area.