JP3476873B2 - Display system and display method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display system for displaying characters, figures and the like on a screen, and more particularly to displaying a specific display image existing in a virtual screen area.

[0002]

2. Description of the Related Art Today, an image display system with a scroll function is known. The system prepares a virtual screen area memory larger than the memory required for the actual display area size (display size) that can be displayed on the CRT, stores data in the virtual screen area memory, and scrolls the screen to obtain the desired data. Is displayed on the CRT. As a result, the data to be displayed on the CRT can be changed without rewriting the data in the virtual screen area memory, so that an area larger than the display size of the CRT can be displayed at high speed.

An image display system with a scroll function will be described with reference to FIG. In the figure, the virtual screen area 44 has an area of 2000 * 1000 dots. Then, a real screen area S1 of 800 * 600 dots, which is a part of the virtual screen area 44, is displayed on the CRT (not shown). In this case, the real screen area S1 is (100, 30
It is represented by the two end points of (0) and (899,899). The function controller 21 of the present system is displayed in the actual screen area S1.

The function controller 21 includes a real screen area size minimization button 22 and a zoom-in button 2.
3, a zoom-out button 24, and a corner display button 25. Function controller 21
The image display is changed by clicking each of the buttons with the mouse.

Each function will be briefly described. When the minimization button 22 of the real screen area size is clicked , the real screen area of the preset minimum size is displayed. When the zoom-in button 23 is clicked, a real screen area which is slightly larger than the current display size is displayed. When you click the zoom out button 24, than the current display size, displays a small real screen area slightly. When the corner display button 25 is clicked, the virtual screen area 44 is displayed.
The four corners of are displayed sequentially in the clockwise direction.

By moving the cursor K outside the real screen area S1, it is possible to refer to an area other than the real screen area S1. For example, when the cursor K is moved from the point P1 to the point P2, the area displayed on the CRT is changed from the real screen area S1 to the real screen area S2 where the point P2 is displayed on the CRT.

As a result, even when one application software is executed in the real screen area S1 and another application software is executed in the real screen area S2, the screens of two or more application software can be displayed by simply scrolling the screen. Can be switched quickly and easily.

[0008]

However, the above system has the following problems. For example,
When the display area displayed on the CRT is changed from the real screen area S1 to the real screen area S2 by moving the cursor K from the point P1 to the point P2, the function controller 21 is out of the display range of the CRT. Therefore, when using the function of the function controller 21, it is necessary to move the cursor K again, change the display area so that the function controller 21 is displayed, and use the function controller 21.

The present invention solves the above problems and provides a display system capable of displaying a specific display image existing in a virtual screen area in a changed real screen area even if the real screen area is changed. To aim.

[0010]

According to a first aspect of the present invention, there is provided a display system, wherein the image data storage means stores image data in a range wider than the display range of the display means, and the image data stored in the image data storage means is the image data storage means. Display range determination data storage means for storing display range determination data for determining the range to be displayed on the display means, display range determination data stored in the display range determination data storage means, and image data stored in the image data storage means Display signal output means for outputting a display signal to the display means, and a display range determination data changing means for changing the display range determination data stored in the display range determination data storage means when a display range changing command is given. In order to display the specific display image on the display means, the display data and the display position data thereof,
Specific display image data storage means for storing as specific display image data, image data changing means for changing image data in the image data storage means based on the specific display image data, and display range determining data by the display range determining data changing means When the display range determination data stored in the storage means is changed, all or part of the specific image display area determined by the display position data of the specific display image is determined by the changed display range determination data. It is determined whether or not it is within the display range, and all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data. If it is determined that the specific image display area determined by the display position data of the specific display image is determined by the changed display range determination data. That specific display image display position changing means for changing the display position data of the specific display images to be included in the display range, and further comprising a.

According to another aspect of the present invention, there is provided an end detecting means for outputting an end detecting signal when the continuously applied display range changing commands are interrupted, and the specific display image display position changing means is arranged to perform the end. The display position data of the specific display image is changed after receiving the detection signal.

In the display system of claim 3, the specific display image display position changing means changes the size of the image display range based on the display range determining data stored in the display range determining data storage means. By doing so, when it is determined that all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, Changing the display position data so that the amount of movement from the specific display image display position before the movement to the specific display image display position after the movement becomes the minimum movement amount, and b) the image display range is moved in parallel. By
If it is determined that all or a part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, the determination before the movement is performed. The amount of movement from the display image display position to the specific display image display position after movement is to change the display position data so as to be a parallel movement amount of the image display range,
Is characterized by.

According to a fourth aspect of the present invention, the image data in a range wider than the display range of the display means is stored, and the display range determination data for determining the range of the image data to be displayed on the display means is stored. In order to display the specific display image on the display means, the display data and the display position data thereof are stored as specific display image data, and when the display range change command is given, the display range determination data is displayed. Changing the image data based on the specific display image data, outputting a display signal to the display means based on the changed display range determination data and the image data, and displaying the display signal. When the range determination data is changed, all or part of the specific image display area determined by the display position data of the specific display image is changed. Is determined within the display range determined by the display range determination data, and all or part of the specific image display area determined by the display position data of the specific display image is the display range determination data after the change. When it is determined that it is outside the display range determined by, the specific image display area determined by the display position data of the specific display image,
It is characterized in that the display position data of the specific display image is changed so as to be included in the display range determined by the changed display range determination data.

In the display method of claim 5, further,
When the display range change command continuously given is interrupted, the end detection signal is output, and the display position data of the specific display image is changed after receiving the end detection signal.

In the display system according to the sixth aspect, based on the changed display range determination data, a) the size of the image display range is changed, so that the display position data of the specific display image is determined. When it is determined that all or part of the specific image display area is outside the display range determined by the changed display range determination data, the specific display image display position after the movement is changed from the specific display image display position before the movement. The display position data is changed so that the amount of movement to the position becomes the minimum amount of movement, and b) the image display range is moved in parallel,
If it is determined that all or a part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, the determination before the movement is performed. The amount of movement from the display image display position to the specific display image display position after movement is to change the display position data so as to be a parallel movement amount of the image display range,
Is characterized by.

[0016]

In the display system or display method according to any one of claims 1 and 4, when the display range determination data is changed, the entire specific image display area determined by the display position data of the specific display image. Alternatively, it is determined whether or not a part is within the display range determined by the changed display range determination data. When it is determined that all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, The display position data of the specific display image is changed so that the specific image display area determined by the display position data of the display image is included in the display range determined by the changed display range determination data. As a result, the display position of the specific display image moves so that all or part of the specific display image is within the range displayed on the display unit in response to the change of the display range determination data.

In the display system or the display method according to any one of claims 2 and 5, further, an end detection signal is output when the continuously applied display range changing command is interrupted, and the end detection signal is received. From, the display position data of the specific display image is changed. Therefore, while the display range change command is continuously given, even if the display range determination data of the display range determination data storage means is changed, the display position of the specific display image is not changed, and the specific display image is displayed on the display means. It is never displayed. Therefore, when the display range change command is given and the range to be displayed is searched, the specific display image does not hinder the search operation.

Further, even when the speed at which the image data changing means changes the image data in the image data storage means 3 is slow,
The display signal can be output at the changing speed of the display range determination data in the display range determination data storage means.

In the display system or the display method according to claim 3 or 6, the display position of the specific display image is changed by changing the size of the image display range based on the changed display range determination data. If it is determined that all or part of the specific image display area determined by the data is outside the display range determined by the changed display range determination data, after moving from the specific display image display position before moving The display position data is changed so that the movement amount of the display image to the specific display image display position becomes the minimum movement amount. Therefore,
When the size of the image display range is changed, it can be moved to the minimum.

On the other hand, by translating the image display range in parallel, all or part of the specific image display area determined by the display position data of the specific display image is determined by the changed display range determination data. If it is determined that the display position is out of the display range, the amount of movement from the specific display image display position before the movement to the specific display image display position after the movement is the display position so that the movement amount is the parallel movement amount of the image display range. Change the data. Therefore, when the size of the image display range is not changed, the specific display image can be displayed at the same relative position on the screen.

[0021]

【Example】

[Image Display System 1] FIG. 1 shows an overall configuration diagram of an image display system 1 which is an embodiment of the present invention. The image display system 1 includes an image data storage unit 3, a display range determination data storage unit 13, a display signal output unit 9, a display range determination data changing unit 14, a specific display image data storage unit 7, an image data changing unit 5, and a specific display. Image display position changing means 1
5 and the end detection means 17.

The image data storage means 3 stores image data in a wider range than the display range of the display means (not shown).
The display range determination data storage unit 13 stores display range determination data that determines a range to be displayed on the display unit among the image data stored in the image data storage unit 3.

The display range determination data changing means 14 changes the display range determining data stored in the display range determining data storage means 13 when a display range changing command is given. The end detection means 17 outputs an end detection signal when the continuously given display range changing commands are interrupted.

Further, the specific display image data storage means 7 is
In order to display the specific display image on the display means, the display data and the display position data thereof are stored as the specific display image data.

When the specific display image display position changing means 15 receives the end detection signal, the specific display image display area changing means 15 determines the specific image display area determined by the display position data of the specific display image stored in the specific display image data storage means 7. All or part
It is determined whether or not it is within the display range determined by the changed display range determination data. Then, when it is determined that all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, In this manner, the display position data of the specific display image is changed so that the specific image display area determined by the display position data of the specific display image is included in the display range determined by the changed display range determination data. To do.

By changing the size of the image display range, all or part of the specific image display area determined by the display position data of the specific display image is determined by the changed display range determination data. When it is determined that the display position data is out of the display range, the display position data is changed so that the movement amount from the specific display image display position before the movement to the specific display image display position after the movement becomes the minimum movement amount. .

On the other hand, when the image display range is moved in parallel, all or part of the specific image display area determined by the display position data of the specific display image is changed to the changed display range determination data. If it is determined that the image is outside the display range determined by, the amount of movement from the specific display image display position before the movement to the specific display image display position after the movement should be the parallel movement amount of the image display range. The display position data is changed.

The image data changing means 5 changes the image data in the image data storage means 3 based on the specific display image data stored in the specific display image data storage means 7. The display signal output means 9 outputs a display signal to the display means based on the display range decision data stored in the display range decision data storage means 13 and the changed image data stored in the image data storage means 3.

In the present specification, the image is used as a concept including all information displayed on the display means such as a character image, a graphic image and a video.

[Hardware Configuration] FIG. 2 shows an example of a hardware configuration in which the image display system 1 is realized by using a CPU. The image display system 1 shown in FIG.
53, ROM 55, RAM 57, keyboard interface 61, V-RAM (video RAM) 62, CRT controller 63, PD (pointing device) interface 65, and bus line 52.

The ROM 55 stores a control program for the CPU 53 and the like. The CPU 53 controls each unit via the bus line 52 according to this control program. The VRAM 62 stores image data in a range (virtual screen area) larger than the display range (real screen area) of the CRT 73. In the present embodiment, the V-RAM 62 constitutes the image data storage means.

The RAM 57 stores display range determination data for determining the range to be displayed on the CRT 73 out of the image data stored in the V-RAM 62. In this embodiment, as the display range determination data, the two end points P31 (600, 400) and P32 (1199, 79) are used as shown in FIG.
The coordinates (9) (coordinates in the virtual screen area) are stored.

Further, in the RAM 57, in order to display the specific display image on the CRT 73, its display data and its display position data are stored as specific display image data. In this embodiment, the function controller 21 is adopted as the specific display image. The RAM 57 stores image data which is display data of the function controller 21 and display position data thereof. In this embodiment, as shown in FIG. 4, as the display position data of the function controller 21, the two end points P1 are set.
The coordinates of 1 and P12 (coordinates in the virtual screen area) are stored.

That is, in this embodiment, the RAM 5
Reference numeral 7 constitutes a display range determination data storage means and a specific display image data storage means.

A keyboard 71 is connected to the keyboard interface 61. CRT controller 63
A CRT 73, which is display means, is connected to. The CRT controller 63 also outputs a display signal to the CRT 73 based on the image data stored in the V-RAM 62. In this embodiment, the CRT controller 63
Constitute display signal output means.

A PD (pointing device) 75 is connected to the PD interface 65. In this example, a mouse was used as PD75. In addition,
In the present embodiment, the PD 75 constitutes a display range change command output means for outputting a display range change command.

[Processing Flowchart] When the state shown in FIG. 4 is displayed on the CRT, move the cursor K to the arrow α.
When it is moved in the direction, the actual screen area moves as the cursor K moves, and as a result, the function controller 21 is no longer displayed on the CRT. In the present embodiment, the function controller 21 automatically moves to the position shown in FIG. 5 as described below. That is, the function controller 21 desired to be displayed
Is displayed on the CRT following the display range.

The operation will be described below with reference to the flowchart of FIG. The CPU 53 (see FIG. 2) acquires the current position and current time of the PD 75 and stores them in the RAM 57 (FIG. 3).
Step ST1). The current position may be acquired by detecting absolute coordinates on the virtual screen area. Next, the CPU 53 determines whether the detected position of the PD 75 is within the current display range (step ST2 in FIG. 3). Specifically, the procedure is as follows. First, the display range determination data stored in the RAM 57 is read. For example, the two end points P as shown in FIG.
31 (600, 400), P32 (1199, 799)
Read the data of. Next, it is determined whether the detected position of the PD 75 is within the range of the read display range determination data. This determination is based on the detected PD75 between the X coordinate "600" of the end point P31 and the X coordinate "1199" of the end point P32.
It is only necessary to determine whether or not the X coordinate of The same applies to the Y coordinate.

If the detected position of the PD 75 is within the range of the read display range determination data, the process proceeds to step ST3 in FIG. 3 to determine whether the PD 75 is moving.
In the present embodiment, R at the current time and step ST1.
When the time difference stored in the AM 57 is equal to or greater than a predetermined value, it is determined whether the position of the PD 75 stored in the RAM 57 in step ST1 is the same as the current position of the PD 75.

If the PD 75 is not moving, that is, if it is stopped, the process proceeds to step ST4 in FIG. 3 and it is determined whether or not the actual screen area size has been changed. In the present embodiment, whether or not the width Wn of the display area represented by the display range determination data at the time of stop and the width Wo of the display area represented by the display range determination data stored in the RAM 57 are the same at the time of stop. It was judged whether or not the height Hn of the display area represented by the display range determination data of 1 and the height Ho of the display area represented by the display range determination data stored in RAM 57 are the same.

The width Wn may be obtained from the difference between the X coordinates of the end points P31 and P32 at the time when the PD 75 is stopped, and the width Wo is the X of the two end points in the display range determination data stored in the RAM 57. It can be obtained from the difference in coordinates. The same applies to the height Hn and the height Ho.

For example, the two endpoints at the time when the PD 75 is stopped are (200, 300) and (999, 899), and the two endpoints in the display range determination data stored in the RAM 57 are (400, 500), ( 1199, 10
99), the width Wn = 999-200 = 799 and the width Wo = 1199-400 = 799. Further, the height Hn = 899-300 = 599, and the height H
o = 1099-500 = 599. Therefore, since both the width and the height are the same, it is determined that the actual screen area size has not been changed.

The actual screen area size is changed, for example, when the zoom-in button 23 (see FIG. 4) is clicked. On the other hand, the PD 71 moves in the X direction and the Y direction.
When the display range is changed by translating in either direction or bidirectionally, the actual screen area size is not changed.

In step ST4 of FIG. 3, the CPU 53
When it is determined that the actual screen area size has not been changed, the process proceeds to step ST8, and the movement amount of the PD 71 is calculated. In this example, the procedure was as follows. An end point P31 (600, 400) whose display range is shown in FIG. 4 and an end point P41 (900, 700) shown in FIG. 5 are read out. Then, the X coordinate "900" of the end point P41 and the X coordinate of the end point P31.
"+300", which is the difference between the coordinates "600", is the movement amount in the X direction, and "+300", which is the difference between the Y coordinate "700" at the end point P41 and the Y coordinate "400" at the end point P31, is the movement amount in the Y direction. To do. Next, the function controller 21
The coordinates of the upper left end point P11 of is read and the calculated movement amount is added to calculate a new display position of the function controller 21 (step ST9 in FIG. 3).

For example, when the upper left end point of the function controller 21 before the movement is represented by (700, 500), the upper left end point of the function controller 21 after the movement is 700 + 300 = 1000 in the X direction, and in the Y direction. 500 + 300 = 800, that is, (1000,8
00).

The CPU 53 moves the function controller 21 to a new display position of the calculated function controller 21 (step ST7 in FIG. 3), and ends the processing.

In this way, when the actual screen area size is not changed, the display position of the function controller 21 is moved by the amount of movement of the display screen, so that the function controller 21 is moved to the same relative position as before the movement.
Can be displayed.

On the other hand, when it is determined in step ST4 that the actual screen area size has been changed, step S4
Proceeding to T5, the CPU 53 determines whether the function controller 21 is within the current display range. If all the function controllers 21 are within the current display range, the movement processing of the function controller 21 is unnecessary and the process ends.

On the other hand, in step ST5, if even part of the function controller 21 is not within the current display range (outside the display range), the display position after movement is calculated (step ST6).

In step ST6, a new display position is calculated as follows.

Xfcr: X coordinate of the right end of the function controller 21 before moving, Xfcl: X coordinate of the left end of the function controller 21 before moving, Yfct: Y coordinate of the upper end of the function controller 21 before moving, Yfcb: Before moving Y coordinate of the lower end of the function controller 21, FCW: width of the function controller 21 in the X direction, FCH: height of the function controller 21 in the Y direction, Xvr: X coordinate of the right end of the display screen after the size change, Xvl: size change Xv of the left end of the rear display screen, Yvt: Y coordinate of the upper end of the display screen after the size change, Yvb: Y coordinate of the lower end of the display screen after the size change, Xnr: X of the right end of the function controller 21 after the movement Coordinates, Xnl: Function control after movement If Xfcl <Xvl, then Xnl = Xvl, where Ynt is the Y coordinate of the upper end of the function controller 21 after movement, and Ynb is the Y coordinate of the lower end of the function controller 21 after movement. , Xnr =
Xnl + FCW; If Xfcr> Xvr, Xnl = Xvr−FCW,
Xnr = Xvr; if Yfct <Yvt, then Ynt = Yvt, Ynb =
Ynt + FCH; if Yfcb> Yvb, then Ynt = Yvb-FCH,
Ynb = Yvb;

The minimum actual screen area size of the display screen is smaller than the size of the function controller 21.
It is set to be large. Therefore, even when a part or all of the function controller 21 is not displayed (when the function controller 21 protrudes from the display screen), the right end of the function controller 21 exceeds the right end of the display range and the left end of the function controller 21 is It does not exceed the left edge of the display range. Therefore, in the X direction, Xfcl <Xv
It may be determined whether or not 1 or Xfcr> Xvr. Y
The same applies to the direction.

The CPU 53 moves the function controller 21 to a new display position of the calculated function controller 21 (step ST7 in FIG. 3), and ends the processing.

In this way, when the actual screen area size is changed, the function controller 21 is displayed on the changed display screen with the minimum movement amount.

On the other hand, in step ST2 of FIG. 3, when the detected position of the PD 75 is outside the range of the read display range determination data, the process proceeds to step ST10 of FIG. 3 and the PD 75 is displayed in the actual screen area display range. The actual screen area display range as shown in FIG.
Repeat 1 or less.

In this embodiment, the detected position of the PD 75 is compared with the display range data stored in the RAM 57, and the display range data is changed by the difference. For example, the two end points P31 (600,
400), P32 (1199, 799) is read,
If the detected position of the PD 75 is (1299,899), it is protruding in both the X direction and the Y direction. Therefore, the coordinates of the two end points P31 and P32 are (70
0,500) and (1299,899). Note that X
Even when only one of the direction and the Y direction is projected, the same process may be performed.

In step ST3 of FIG. 3, PD
When 75 is moving, step ST1 and subsequent steps are repeated. Thus, the function controller 21 is not moved while the PD 75 is moving. This makes it possible to scroll the display range and search for the display range.
Since the function controller 21 is not displayed, the function controller 21 does not interfere with the search work.

In general, the speed at which the CRT controller 63 changes the image data in the V-RAM 62 is slower than the speed at which the image is scrolled. However, in this embodiment, the function controller 21 is not moved while the PD 75 is moving. That is, it is not necessary for the CRT controller 63 to change the image data of the V-RAM 62 while the PD 75 is moving. Therefore, smooth scrolling is possible without lowering the image scrolling speed.

In the present embodiment, the movement processing has been described by using the example in which the function controller 21 is displayed long in the X direction, but the same applies when the function controller 21 is displayed long in the Y direction. You can move it to.

[Other Application Examples] In this embodiment, the case where the command input icon is automatically followed has been described as an example. However, the present invention is not limited to this, and it is desired to display on the display means. Any display image may be used, for example, a clock display or an operating status display in a computer system may be used.

In the present embodiment, the case where the function controller 21 is not displayed on the screen of the CRT due to the screen scrolling or zooming up has been described, but the present invention is not limited to this, and the rotation processing of the real screen area is performed. Even if the function controller 21 is not displayed on the screen of the CRT by vertically (or vertically) mirroring (reversing) it can be similarly applied. Furthermore, since the resolution of the CRT was changed on the way, the function controller 21
The same can be applied to the case where is not displayed on the screen of the CRT.

Although a mouse is used as the PD 75 in this embodiment, a tablet trackball or the like may be used.

In the present embodiment, the PD 75 constitutes the display range change command output means, but the keyboard 71 is used.
The cursor movement key or the like may be configured as the display range change command output means.

In the present embodiment, whether or not the PD 75 is moving is determined by comparing the position of the PD 75 after a predetermined time has elapsed from the time when the position of the PD 75 was stored.
The count value or the like may be used without being limited to the time.

In the present embodiment, the processing operation is made different when the real screen area size is changed and when it is not changed, but the present invention is not limited to this.
Even when the actual screen area size is not changed, the same processing as when the actual screen area size is changed may be performed.

Further, in this embodiment, in order to realize the function shown in FIG. 1, the CPU 53 is used and this is realized by software. However, some or all of them may be realized by hardware such as a logic circuit.

[0067]

According to the display system or the display method of claims 1 and 4, when the display range determination data is changed, the specific image display area determined by the display position data of the specific display image. It is determined whether or not all or part of is within the display range determined by the changed display range determination data. When it is determined that all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, The display position data of the specific display image is changed so that the specific image display area determined by the display position data of the display image is included in the display range determined by the changed display range determination data. Therefore, the display position of the specific display image moves so that all or a part of the specific display image is within the range displayed on the display unit according to the change of the display range determination data. As a result, even if you change the real screen area,
It is possible to provide a display system or a display method capable of displaying a specific display image existing in a virtual screen area in a changed real screen area.

In the display system or the display method according to any one of claims 2 and 5, further, when the continuously given display range changing command is interrupted, an end detection signal is output, and the end detection signal is received. From, the display position data of the specific display image is changed. Therefore, when the display range change command is given and the range to be displayed is searched, the specific display image does not hinder the search operation. The display signal can be output at the changing speed of the display range determination data in the display range determination data storage means.

As a result, it is possible to provide a display system or display method with higher operability.

In the display system or the display method according to claim 3 or 6, the display position of the specific display image is changed by changing the size of the image display range based on the changed display range determination data. If it is determined that all or part of the specific image display area determined by the data is outside the display range determined by the changed display range determination data, after moving from the specific display image display position before moving The display position data is changed so that the movement amount of the display image to the specific display image display position becomes the minimum movement amount. Therefore,
When the size of the image display range is changed, it can be moved to the minimum.

On the other hand, by translating the image display range in parallel, all or part of the specific image display area determined by the display position data of the specific display image is determined by the changed display range determination data. If it is determined that the display position is out of the display range, the amount of movement from the specific display image display position before the movement to the specific display image display position after the movement is the display position so that the movement amount is the parallel movement amount of the image display range. Change the data. Therefore, when the size of the image display range is not changed, the specific display image can be displayed at the same relative position on the screen. Accordingly, it is possible to provide a display system or a display method with higher operability.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an image display system 1 according to the present invention.

FIG. 2 is a diagram showing a hardware configuration in which the image display system 1 is realized by a CPU.

FIG. 3 is a flowchart of the image display system 1.

FIG. 4 is a diagram showing an example of a CRT display of the image display system 1.

5 is a diagram showing a state in which the display area is scrolled to the upper left from the CRT display in FIG.

FIG. 6 is a diagram showing a relationship between a virtual screen area and a real screen area.

[Explanation of symbols] 3 ... Image data storage means 5 ... Image data changing means 7-Specific display image data storage means 9: Display signal output means 13 ... Display range determination data storage means 14 ... Display range determination data changing means ・ ・ ・ ・ Specific display image display position changing means 17 ... End detection means

Claims (6)

(57) [Claims] 1. An image data storage means for storing image data in a range wider than the display range of the display means, and a display range determination for determining a range to be displayed on the display means out of the image data stored in the image data storage means. Display range determination data storage means for storing data, display for outputting a display signal to the display means based on the display range determination data stored in the display range determination data storage means and the image data stored in the image data storage means Signal output means, display range determination data changing means for changing the display range determining data stored in the display range determining data storage means when a display range changing command is given, and for causing the display means to display a specific display image A specific display image data storage unit that stores the display data and the display position data as the specific display image data. Image data changing means for changing the image data of the image data storing means based on the specific display image data, and the display range determining data stored in the display range determining data storing means by the display range determining data changing means is changed. Then, the whole or part of the specific image display area determined by the display position data of the specific display image is determined whether it is within the display range determined by the changed display range determination data, If it is determined that all or part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, The display position of the specific display image so that the specific image display area determined by the display position data is included in the display range determined by the changed display range determination data. Display system characterized by comprising a specific display image display position change means for changing the over data, the. 2. The display system according to claim 1, further comprising: end detection means for outputting an end detection signal when a continuously applied display range change command is interrupted, the specific display image display position change means. Changing the display position data of the specific display image after receiving the end detection signal. 3. The display system according to claim 2 , wherein the specific display image display position changing means is based on the display range determination data stored in the display range determination data storage means: a) the size of the image display range is When it is determined that all or part of the specific image display area determined by the display position data of the specific display image is changed and is outside the display range determined by the changed display range determination data. Changes the display position data so that the amount of movement from the specific display image display position before the movement to the specific display image display position after the movement becomes the minimum movement amount. B) The image display range is moved in parallel. By being
If it is determined that all or a part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, the determination before the movement is performed. The display system is characterized in that the display position data is changed so that the movement amount from the display image display position to the specific display image display position after the movement is the parallel movement amount of the image display range. 4. Image data in a range wider than the display range of the display means is stored, display range determination data for determining a range to be displayed on the display means among the image data is stored, and the display means In order to display the specific display image on the display, the display data and the display position data are stored as specific display image data, and when a display range change command is given, the display range determination data is changed, In the display method of changing the image data based on the display image data and outputting and displaying a display signal to the display means based on the changed display range determination data and image data, the display range determination data is changed. In this case, all or part of the specific image display area determined by the display position data of the specific display image is changed to the display range determination data after the change. Whether or not it is within the display range determined by the display area, and all or part of the specific image display area determined by the display position data of the specific display image is determined by the changed display area determination data. When it is determined that the specific image display area is determined to be outside the display range, the specific image display area determined by the display position data of the specific display image is included in the display range determined by the changed display range determination data. A display method characterized by changing the display position data of the display image. 5. The display method according to claim 4, further comprising outputting an end detection signal when continuous display range changing commands are interrupted, and receiving the end detection signal before the specific display image. The display method is characterized by changing the display position data of. 6. The display method according to claim 5 , wherein , based on the changed display range determination data, a) the display position data of the specific display image is determined by changing the size of the image display range. When it is determined that all or part of the specific image display area that is to be displayed is outside the display range determined by the changed display range determination data, the specific display image before the movement and the specific display image after the movement The display position data is changed so that the amount of movement to the display position becomes the minimum amount of movement, and b) the image display range is moved in parallel,
If it is determined that all or a part of the specific image display area determined by the display position data of the specific display image is outside the display range determined by the changed display range determination data, the determination before the movement is performed. The display position data is changed so that the movement amount from the display image display position to the specific display image display position after the movement is the parallel movement amount of the image display range.