JPH07168552A - Rubber band frame display device - Google Patents

Abstract

PURPOSE:To eliminate the flickering of the whole of rubber band frames and to improve operability by reducing an area performing the erasing and the redisplaying of rubber band frames when a plotting is performed in a window where rubber band frames are included. CONSTITUTION:This device is provided with a data saving area 9 for saving display data of the rubber band frame area on a frame buffer 11, a plotting area managing table 8 indicating a plotting area in the window, a scope area setting means 5 for calculating displayable areas to store them in the plotting area managing table 8, a rubber band frame part display means 3 for plotting prescribed rubber band frame graphics, a rubber band frame part erasing means 4 for erasing rubber band frame graphics, a rubber band frame control means 2 for performing the erasing, redisplaying and movement control of rubber band frames and a plotting means 16 for plotting designated graphics in the frame buffer 11 and redisplaying rubber band frame parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of drawing an outer shape (hereinafter referred to as a rubber band frame) for indicating the size and position of a window when the window is resized or moved in a multi-window display system.

[0002]

2. Description of the Related Art Conventionally, in a system having no dedicated hardware for displaying a rubber band frame, the rubber band frame is displayed by mixing and drawing the rubber band frame on the frame buffer used for drawing a figure. . In that case, when drawing is performed in any of the windows, first, the entire rubber band frame is erased, and after the drawing is completed, the rubber band frame is displayed again.

[0003]

In the above-mentioned conventional rubber band frame display device, the entire rubber band frame is erased and redisplayed every time drawing is performed, regardless of the display position of the rubber band frame. When drawing in that window, the rubber band frame always flickers, which is a drawback in that operability is poor.

[0004]

In order to solve the above-mentioned problems, a first embodiment of a rubber band frame display device of the present invention is a display device and a frame for storing a picture image displayed on the display device. In a multi-window display system including a buffer, an input unit for designating a display position on the display device, and a storage unit, a rubber band frame which is an outer shape for indicating the size and position of the window when the window is resized or moved. And a data save area for saving display data of the rubber band frame area on the frame buffer on the storage means, and a rubber band frame display device for displaying The drawing area management table that shows the drawing area of the The scope area setting means for calculating a displayable area in the scope area that has been displayed and registering it in the drawing area management table, and the area data for displaying at least a part of the rubber band frame on the frame buffer, Rubber band frame portion display means for transferring at least a part of a predetermined rubber band frame graphic to the data save area, and data in the data save area at a rubber band frame display position on the frame buffer. The rubber band frame part erasing means for transferring and erasing at least a part of the rubber band frame figure, and the rubber band frame part erasing means and the rubber band frame part displaying means activated by the input means and the like. Rubber band frame control means for erasing, re-displaying, and movement control, and a drawing instruction from the host device. Then, the rubber band frame control means is activated before the drawing is started to erase the rubber band frame portion in the drawing area, then the drawing area management table is referred to, the designated figure is drawn in the frame buffer, and then, again. Drawing means for activating the rubber band frame control means to re-display the rubber band frame portion in the drawing area.

The second embodiment of the present invention is started by a clipping area setting instruction from a host device, calculates a displayable area within the instructed clipping area, and sets the clipping area setting in the drawing area management table. Have means.

The third embodiment of the present invention is started by a drawing instruction from a higher-level device, calculates a minimum rectangular area which internally includes the instructed drawing figure, and then calculates a displayable area in the area. It has a drawing area setting means for registering in the drawing area management table.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a block diagram showing a first embodiment of the present invention, an input means 1, a rubber band frame control means 2, a rubber band frame part display means 3, a rubber band frame part erasing means 4, It is composed of a scope area setting means 5, a drawing means 6, a storage means 7, a drawing area management table 8, a data save area 9, a host device 10, a frame buffer 11 and a display device 12.

The input means 1 is for instructing the movement of the rubber band frame, and for example, a mouse and a trackball are known.

The rubber band frame control means 2 performs preprocessing for displaying or erasing the rubber band frame in accordance with the given instruction mode. Here, the instruction mode is for instructing the rubber band frame control means 2 from the input means 1 or the drawing means 6 which mode should be operated, and there are three types of display mode, moving mode and erasing mode.

The rubber band frame portion display means 3 saves the image data in the drawing area of the frame buffer 11 in the data saving area 9 and draws a line segment as a rubber band frame in the area.

The rubber band frame part erasing means 4 transfers the image data in the data saving area 9 to the frame buffer 11 to delete the rubber band frame part in the drawing area.

The scope area setting means 5 divides the scope area according to the display state of the window and registers it in the drawing area management table 8. Here, the scope area is
A display area inside a window. Referring to FIG. 15, a scope area 81 and a display graphic 91 in the window 80 are shown.

The drawing means 6 determines the position of the rubber band frame and, if it is in the drawing area, activates the rubber band frame control means 2 to partially erase the rubber band frame, and then is instructed by the host device. Framed figure 1
Draw to 1. After the drawing is completed, if the rubber band frame is within the drawing area, the rubber band frame control means 2 is activated to partially display the rubber band frame.

The storage means 7 stores a drawing area management table 8, a data save area 9 and the like. Here, the drawing area management table 8 is an area in which a drawable area in the window is represented by a plurality of rectangles (also referred to as a rectangle list). The data save area 9 is for saving image data in an area that is erased by drawing a rubber band frame.

The higher-level device 10 gives a drawing instruction to the drawing means 6 or gives a scope area setting instruction to the scope area setting means 5.

The frame buffer 11 is a buffer for writing an image for actually displaying the image on the display device 12.

Next, the operation of the first embodiment of the present invention will be described with reference to the drawings.

First, when the higher-level device 10 issues a window scope area setting instruction, the scope area setting means 5 is activated. Referring to FIG. 7, in the processing in the scope area setting means 5, in step 501, the scope area is divided according to the display state of the window to create a displayable area, and in step 502, drawing in the storage means 7 is performed. Register in the area management table 8. Here, in the drawing area management table 8, when the scope area is hidden by another window as shown in FIG. 11A, the drawing area data divided into three as shown in FIG. 11B is registered. It

Next, the operation when the drawing instruction is given from the upper level device 10 will be described.

When there is a drawing instruction from the host device 10, the drawing means 6 is activated. Referring to FIG. 8, in the processing by the drawing means 6, first, in step 601, the drawing area management table 8 is referred to and it is checked whether or not the rubber band frame is within the drawing area of the window for which the drawing instruction is issued. .
If it is in the drawing area, the rubber band frame control means 2 is activated in the erasing mode in step 602 in order to partially erase the rubber band frame. The rubber band frame control means 2 activated by the drawing means 6 in this way
Checks the instruction mode in step 201 of the process flow chart of FIG. Since the erase mode is activated here, in steps 202 to 205, the erase area of the rubber band frame is calculated with reference to the drawing area management table 8. Then, in step 206, the rubber band frame part erasing means 4 is activated. The rubber band frame part erasing means 4 uses the storage means 7 in step 401 of FIG.
By transferring the screen data saved in the upper data save area 9 to the frame buffer 11, the rubber band frame of the area is erased. The rubber band frame control means 2 erases the rubber band frame portion in the drawing area by the rubber band frame portion erasing means 4 in this way, and then checks the instruction mode in step 207 to check that the erase mode is selected. It is delivered to the drawing means 6 (see FIG. 12A).

Referring to FIG. 6, thereafter, the drawing means 6 draws the graphic instructed by the higher-level device 10 on the frame buffer 11 in step 603 (see FIG. 12B). Then, after the drawing is completed, the drawing means 6 performs step 60.
4, the drawing area management table 8 is referred to, and it is checked whether or not the rubber band frame is within the drawing area of the window for which drawing is instructed. If it is within the drawing area, the rubber band frame is partially displayed. Then, in step 605, the rubber band frame control means 2 is activated in the display mode. The rubber band frame control means 2 restarted in this way checks the instruction mode at step 201, and since it is the display mode, jumps to step 209 and goes to step 20.
9 to step 212, drawing area management table 8
Calculate the display area of the rubber band frame by referring to. Then, in step 213, the rubber band frame portion display means 3
To start. The rubber band frame portion display means 3 transfers the screen data at the rubber band frame position on the frame buffer 11 to the data save area 9 on the storage means 7 in step 301 of FIG. The rubber band frame display is performed by drawing the sub-graphics at the corresponding positions on the frame buffer 11. The rubber band frame control means 2 displays the rubber band frame portion in the drawing area on the rubber band frame portion display means 3 in this way, and then ends the processing (see FIG. 12C).

Next, the operation when there is an instruction to move the rubber band frame from the input means 1 will be described.

The rubber band frame control means 2 is activated in the moving mode in response to an instruction to move the rubber band frame from the input means 1 such as a mouse. After checking the instruction mode in step 201 of FIG. 4, the rubber band frame control means 2 is in the moving mode.
In step 05, the rubber band frame erasing area is calculated with reference to the drawing area management table 8, and the rubber band frame partial erasing means 4 is activated in step 206.
Erase the currently displayed rubber band frame. In this case, the erased area of the rubber band frame is a portion not included in the drawing area of the window being drawn. After the instruction mode is checked again in step 207, the rubber band frame position is updated in step 208, and step 2
09 to step 212, the drawing area management table 8
Calculate the display area of the rubber band frame by referring to.
Then, in step 213, the rubber band frame portion display means 3 is activated to re-display the rubber band frame, and the processing ends. In this case, the display area of the rubber band frame is a portion not included in the drawing area of the window being drawn.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, a block diagram showing a second embodiment of the present invention, an input means 1, a rubber band frame control means 2, a rubber band frame part display means 3, a rubber band frame part erasing means 4, It comprises a clipping area setting means 13, a drawing means 6, a storage means 7, a drawing area management table 8, a data saving area 9, a host device 10, a frame buffer 11 and a display device 12. The scope area setting means 5 of the first embodiment is the clipping area setting means 1
The configuration is the same as that of the first embodiment except that it is replaced with the third embodiment. The clipping area setting means 13 sets a clipping area in the drawing area management table 8. Here, the clipping area refers to an area where the internal area of the clip frame set for the drawing figure and the scope area overlap. Referring to FIG. 16, the scope area 8
The display graphic 91 in 1 is clipped by the clip frame 82.

Next, the operation of the second embodiment of the present invention will be described with reference to the drawings.

First, when the upper-level device 10 issues a window clipping region setting instruction, the clipping region setting means 13 is activated.

Referring to FIG. 9, the clipping area setting means 13 divides the clipping area according to the display state of the window in step 1301 to create a displayable area. Then, in step 1302, the storage means 7
It is registered in the drawing area management table 8 above. here,
In the drawing area management table 8, when the clipping area is hidden by another window as shown in FIG. 11A, the drawing area data divided into three as shown in FIG. 11B is registered.

Next, the operation of the processing when a drawing instruction is given from the upper level device 10 will be described.

The upper level device 10 activates the drawing means 6 by issuing a drawing instruction. Referring to FIG. 8, in step 601, the drawing unit 6 refers to the drawing area management table 8 and checks whether the rubber band frame is within the drawing area of the window for which the drawing instruction is issued. If the rubber band frame is in the drawing area, the rubber band frame control means 2 is activated in the erasing mode in step 602 in order to partially erase the rubber band frame. Referring to FIG. 4, the rubber band frame control means 2 activated by the drawing means 6 in this way checks the instruction mode at step 201 and is in the erasing mode. Therefore, at step 202 to step 205, the drawing is performed. The erased area of the rubber band frame is calculated with reference to the area management table 8. Then, in step 206, the rubber band frame part erasing means 4 is activated. The rubber band frame part erasing means 4 activated in this way transfers the screen data saved in the data saving area 9 on the storage means 7 to the frame buffer 11 in step 401 of FIG. Erase the rubber band frame in the area. The rubber band frame control means 2 erases the rubber band frame portion in the drawing area by the rubber band frame portion erasing means 4 and then checks the instruction mode in step 207.
Since the mode is the erase mode, the control is transferred to the drawing means 6 (see FIG. 13A).

After that, the drawing means 6 renders the graphic instructed by the higher-level device 10 in step 603 to the frame buffer 1.
1 is drawn (see FIG. 13B). After the drawing is completed, the drawing means 6 refers to the drawing area management table 8 in step 604 to check whether the rubber band frame is in the drawing area of the window for which the drawing instruction is given, If there is, the rubber band frame control means 2 is activated in the display mode in step 605 to partially display the rubber band frame. The rubber band frame control means 2 checks the instruction mode in step 201 and, because it is the display mode, calculates the display region of the rubber band frame with reference to the drawing region management table 8 in steps 209 to 212. . And step 21
At 3, the rubber band frame display means 3 is activated to redisplay the rubber band frame part in the drawing area, and the process ends (see FIG. 13C). Here, the rubber band frame portion display means 3 transfers the screen data at the rubber band frame position on the frame buffer 11 to the data save area 9 on the storage means 7 at step 301, and then at step 302 the rubber band frame The rubber band frame display is realized by drawing the partial figure at the position on the frame buffer 11.

Next, the operation when there is an instruction to move the rubber band frame from the input means 1 will be described.

When there is an instruction to move the rubber band frame from the input means 1 such as a mouse, the rubber band frame control means 2 is activated in the moving mode. The rubber band frame control means 2
In step 201, the instruction mode is checked, and since it is the movement mode, steps 202 to 205
At, the erase area of the rubber band frame is calculated with reference to the drawing area management table 8. Then, in step 206, the rubber band frame erasing means 4 is activated to erase the rubber band frame currently displayed. In this case, the erased area of the rubber band frame is a portion not included in the drawing area of the window being drawn. Then, in step 207, the instruction mode is rechecked, and since it is the movement mode, the rubber band frame position is updated in step 208,
In steps 209 to 212, the display area of the rubber band frame is calculated with reference to the drawing area management table 8. Then, in step 213, the rubber band frame portion display means 3 is activated to redisplay the rubber band frame, and the processing is completed. In this case, the display area of the rubber band frame is a portion not included in the drawing area of the window being drawn.

Next, the operation of the third embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 3, a block diagram showing a third embodiment of the present invention, an input means 1, a rubber band frame control means 2, a rubber band frame part display means 3, a rubber band frame part erasing means 4, The drawing area setting means 14, the drawing means 6, the storage means 7, the drawing area management table 8, the data saving area 9, the host device 10, the frame buffer 11 and the display device 12 are included. The configuration is the same as that of the first embodiment except that the drawing area setting means 14 is provided between the host device 10 and the drawing means 6 and the scope area setting means 5 is removed. The drawing area setting means 14 is for calculating and registering a minimum rectangular area including a drawing figure. Here, the minimum rectangular area refers to an area where the internal area of the minimum rectangle including the vertices of the drawn figure and the scope area overlap. When the clip frame is specified, the internal region of the clip frame further overlaps. Referring to FIG. 17, a minimum rectangle 83 related to the drawing graphic 91 in the scope area 81 is shown.

Next, the operation of the third embodiment of the present invention will be described with reference to the drawings.

First, the drawing area setting means 14 is activated when a drawing instruction is given from the upper level device 10. Referring to FIG. 10, the drawing area setting means 14 executes step 140.
In 1, the minimum rectangular area including the drawn figure is calculated. Then, in step 1402, the area is divided according to the display state of the window to create a displayable area. The area created in this way is processed in step 140.
3, the drawing area management table 8 stored in the storage unit 7
Then, the drawing means 6 is activated. Here, in the drawing area management table 8, when the minimum drawing area is hidden by another window as shown in FIG. 11A, FIG.
As described above, the drawing area data divided into three is registered. In step 601, the drawing means 6 refers to the drawing area management table 8 to check whether the rubber band frame is in the drawing area of the window for which the drawing instruction is given, and if it is in the drawing area, the rubber is drawn. In order to partially erase the band frame, the rubber band frame control means 2 is activated in the erase mode in step 602. The rubber band frame control means 2 checks the instruction mode in step 201 and, since it is the erase mode, calculates the erase region of the rubber band frame by referring to the drawing region management table 8 in steps 202 to 205. . Then, in step 206, the rubber band frame part erasing means 4 is activated to erase the rubber band frame part in the drawing area, and in step 207, the instruction mode is checked, and the control is drawn because it is the deletion mode. Transfer to means 6 (see FIG. 14 (a)). Here, the rubber band frame part erasing means 4 executes step 40.
In 1, the screen data saved in the data save area 9 on the storage unit 7 is transferred to the frame buffer 11, thereby erasing the rubber band frame in the area.
After that, the drawing unit 6 determines in step 603 that the host device 10
The figure instructed from is drawn on the frame buffer 11 (see FIG. 14B). After the drawing is completed, the drawing means 6 refers to the drawing area management table 8 in step 604 to check whether or not the rubber band frame is in the drawing area of the window for which the drawing is instructed, and is in the drawing area. In case of step 6 to partially display the rubber band frame
05, the rubber band frame control means 2 is activated in the display mode. The rubber band frame control means 2 executes step 201.
At step 209 to step 212, the instruction mode is checked, and the display area of the rubber band frame is calculated with reference to the drawing area management table 8 in step 209 to step 212. Then, in step 213, the rubber band frame part display means 3 is activated to redisplay the rubber band frame part in the drawing area, and the process is terminated (see FIG. 14C). Here, the rubber band frame portion display means 3 performs step 301.
In step 302, after transferring the screen data at the rubber band frame position on the frame buffer 11 to the data save area 9 on the storage means 7, at step 302, drawing the partial figure of the rubber band frame at the position on the frame buffer 11. Realizes the rubber band frame display.

Next, the operation when there is an instruction to move the rubber band frame from the input means 1 will be described.

When there is an instruction to move the rubber band frame from the input means 1 such as a mouse, the rubber band frame control means 2 is activated in the moving mode. Then, in step 201, the instruction mode is checked, and since it is the movement mode,
In steps 202 to 205, the erase area of the rubber band frame is calculated with reference to the drawing area management table 8. Then, in step 206, the rubber band frame erasing means 4 is activated to erase the rubber band frame currently displayed. In this case, the erased area of the rubber band frame is a portion not included in the drawing area of the window being drawn. After the instruction mode is rechecked in step 207, the rubber band frame position is updated in step 208. Then, in steps 209 to 212, the display area of the rubber band frame is calculated with reference to the drawing area management table 8. afterwards,
In step 213, the rubber band frame part display means 3 is activated to redisplay the rubber band frame, and the process is ended. In this case, the display area of the rubber band frame is a portion not included in the drawing area of the window being drawn.

[0041]

As described above, according to the present invention, when drawing is performed in a window including a rubber band frame, the rubber band frame is erased and redisplayed by reducing the area. This has the effect of eliminating flicker in the entire frame and improving operability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a processing flow of a rubber band frame control means 2 in each embodiment of the present invention.

FIG. 5 is a diagram showing a processing flow of the rubber band frame portion display means 3 in each embodiment of the present invention.

FIG. 6 is a diagram showing a processing flow of a rubber band frame part erasing means 4 in each embodiment of the present invention.

FIG. 7 is a diagram showing a processing flow of a scope area setting means 5 in each embodiment of the present invention.

FIG. 8 is a diagram showing a flow of processing of a drawing means 6 in each embodiment of the present invention.

FIG. 9 is a diagram showing a processing flow of a clipping area setting means 13 in the second exemplary embodiment of the present invention.

FIG. 10 is a diagram showing a processing flow of a drawing area setting means 14 in a third embodiment of the present invention.

FIG. 11 is a diagram showing an example of data set in a drawing area management table 8 in each embodiment of the present invention.

FIG. 12 is a diagram showing an example of a process of controlling the rubber band frame in the first embodiment of the present invention.

FIG. 13 is a diagram showing an example of a control process of the rubber band frame in the second embodiment of the present invention.

FIG. 14 is a diagram showing an example of a rubber band frame control process in the third embodiment of the present invention.

FIG. 15 is a diagram for explaining a scope area in the present invention.

FIG. 16 is a diagram for explaining a clipping region in the present invention.

FIG. 17 is a diagram for explaining a minimum rectangular area in the present invention.

[Explanation of symbols]

 1 Input Means 2 Rubber Band Frame Control Means 3 Rubber Band Frame Partial Display Means 4 Rubber Band Frame Part Erase Means 5 Scope Area Setting Means 6 Drawing Means 7 Storage Means 8 Drawing Area Management Table 9 Data Evacuation Area 10 Upper Device 11 Frame Buffer 12 Display device 13 Clipping area setting means 14 Drawing area setting means 80 Window 80 Scope area 82 Clip frame 83 Minimum rectangular area 91 Drawing figure 92 Clipped figure

Claims (3)

[Claims] 1. A multi-window display system including a display device, a frame buffer for storing a picture image displayed on the display device, an input means for designating a display position on the display device, and a storage means. A rubber band frame display device for displaying a rubber band frame which is an outer shape for indicating the size and position of a window when resized or moved, and a rubber band frame area on the frame buffer on the storage means. A data save area for saving the display data of, a drawing area management table indicating the drawing area in the window on the storage unit, and the specified scope that is activated by the window scope area setting instruction from the host device. Scope area that calculates the displayable area in the area and registers it in the drawing area management table Setting means and data of an area in which at least a part of the rubber band frame on the frame buffer is to be displayed are transferred to the data save area, and then a part or all of a predetermined rubber band frame figure is drawn in the area. Rubber band frame part display means for transferring the data in the data save area to the rubber band frame display position on the frame buffer and deleting part or all of the rubber band frame graphic, Means for activating the rubber band frame part erasing means and the rubber band frame part displaying means to erase / redisplay / move the rubber band frame, and a drawing from a host device Activated by an instruction, after starting the rubber band frame control means before starting drawing and erasing the rubber band frame part in the drawing area, With reference to the drawing area management table, draw an indicator figure in the frame buffer,
After that, the rubber band frame display device further comprises a drawing means for activating the rubber band frame control means again to redisplay the rubber band frame portion in the drawing area. 2. A multi-window display system including a display device, a frame buffer for storing a picture image displayed on the display device, an input means for designating a display position on the display device, and a storage means. A rubber band frame display device for displaying a rubber band frame which is an outer shape for indicating the size and position of a window when resized or moved, and a rubber band frame area on the frame buffer on the storage means. Data saving area for saving the display data of, a drawing area management table indicating the drawing area in the window on the storage means, and a clipping area setting instruction from a higher-level device, Setting the clipping area to calculate the displayable area and register it in the drawing area management table Setting means and the data of an area for displaying a part or all of the rubber band frame on the frame buffer is transferred to the data save area, and then a part or all of a predetermined rubber band frame figure is displayed in the area. A rubber band frame portion display means for drawing, a rubber band frame portion erasing means for transferring the data in the data save area to a rubber band frame display position on the frame buffer and erasing a part or all of the rubber band frame figure, A rubber band frame control unit that is activated from an input unit or the like and that activates the rubber band frame partial erasing unit and the rubber band frame partial display unit to perform erasure / redisplay / movement control of the rubber band frame, It is activated by the drawing instruction, and after the rubber band frame control means is activated to erase the rubber band frame part in the drawing area before the drawing is started, Referring to the drawing area management table, draw the designated figure in the frame buffer,
Then, a rubber band frame display device having a drawing means for activating the rubber band frame control means again to redisplay the rubber band frame portion in the drawing area. 3. A multi-window display system comprising a display device, a frame buffer for storing image images to be displayed on the display device, an input means for designating a display position on the display device, and a storage means. A rubber band frame display device for displaying a rubber band frame which is an outer shape for indicating the size and position of a window when resized or moved, and a rubber band frame area on the frame buffer on the storage means. Data saving area for saving the display data of, a drawing area management table indicating the drawing area in the window that is on the storage means, and is started by the drawing instruction from the upper-level device After calculating the minimum rectangular area containing the area, the displayable area in the area is calculated and registered in the drawing area management table. The image area setting means and the data of an area for displaying a part or all of the rubber band frame on the frame buffer are transferred to the data saving area, and then a part or a predetermined rubber band frame figure is displayed in the area. A rubber band frame part displaying means for drawing the whole and a rubber band frame part deleting means for transferring the data in the data save area to the rubber band frame display position on the frame buffer and deleting a part or all of the rubber band frame figure And a rubber band frame control unit that is activated from an input unit or the like to activate the rubber band frame partial erasing unit and the rubber band frame partial display unit to perform erasure / redisplay / movement control of the rubber band frame, the drawing Activated from the area setting means, after activating the rubber band frame control means before starting the drawing to erase the rubber band frame part in the drawing area, A rubber having drawing means for referring to the drawing area management table, drawing an indicator figure in the frame buffer, and then reactivating the rubber band frame control means to redisplay the rubber band frame portion in the drawing area. Band frame display device.