JPH07334341A - Window controller - Google Patents

Abstract

PURPOSE:To prevent a display position and the row number or column number of a character from changing even when the size of a window is varied by determining column size and window size according to the number of pixels in consideration of the resolution of a display screen. CONSTITUTION:The size of the window after size variation is specified (step S11). Then data on a character font corresponding to the specified size of the window is read out of a register and selected (step S12). Then the size of the character font corresponding to the specified size is calculated and the size of a character display column which is optimum for the character size is determined (step S13). Then the size of the window corresponding to the determined size of the character display is determined on the basis of a specific expression (step S14). Then the size of the window on the display screen is varied to the said determined size and the display contents of the window are enlarged or reduced (step S15).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window control device, and more particularly to a window control device suitable for a graphic processing device such as a CAD system.

[0002]

2. Description of the Related Art Conventionally, a graphics processing device such as a CAD system may change the size of a window. When the size of the window is changed, the contents of the window display such as graphics and characters are changed accordingly. I am trying to enlarge / reduce. In this case, regarding the character, the size of the column for displaying the character and the size of the character font are not changed, but the display position is changed to perform the enlargement / reduction display.

In the graphic processing apparatus, when drawing a graphic such as a line segment or a circle, the display position is generally designated by the actual coordinates shown by (X, Y), but a character string is written in a table or the like. In such a case, the display position may be specified by the column coordinates shown in (row, column).

[0004]

However, conventionally, even if the size of the window is changed as described above, the size of the column for displaying the characters and the size of the character font have not been changed. Therefore, if you change the size of the window, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates will change, or the number of lines or columns of characters that can be displayed in the window will change. (Fig. 4
(See FIG. 6 for comparison: when the character display column size and the character font are constant).

Further, when the size of the window is changed, the character spacing becomes unnaturally widened (when enlarged, see FIG. 4 and FIG. 7: when character fonts are constant), and characters overlap. There was a problem that it was displayed as (when reduced).

The present invention has been made under such a background. A first object of the present invention is to display a display position specified by real coordinates and a display position specified by column coordinates even if the size of a window is changed. It is to prevent the relative relationship with and from changing, and the number of lines and columns of characters that can be displayed in the window.

A second object of the present invention is that, even if the size of the window is changed, the character spacing becomes unnaturally widened,
It is to prevent characters from overlapping.

[0008]

In order to achieve the first object, the invention according to claim 1 is a graphic processing apparatus having a function of changing the size of a window, and the window after the change according to a predetermined aspect ratio. Window size designating means for designating a size, and column size determining means for determining the character display column size according to the changed window size designated by the window size designating means by the number of pixels in consideration of the resolution of the display screen. A window size determining means for determining the window size according to the character display column size determined by the column size determining means by the number of pixels in consideration of the resolution of the display screen, and a size determined by the window size determining means. Change the window size and the size of the window display contents. And a changing means for.

In order to achieve the first object, the second aspect
In the invention described above, the window size designating means in claim 1 is configured to designate a window size by selecting one from a plurality of window sizes having a predetermined aspect ratio registered in advance. There is.

In order to achieve the first object, claim 3
In the invention described above, the window size designating means in claim 2 has a display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance.

In order to achieve the first object, it is preferable that:
In the described invention, the window size designating means in claim 2 has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance.

In order to achieve the first object, the invention according to claim 5
In the described invention, the window in which the changed window size is designated by the window size designation means in claim 1 is a window being displayed.

In order to achieve the first object, claim 6
In the invention described above, the window in which the changed window size is designated by the window size designating means in claim 1 is a predetermined initial window.

In order to achieve the above-mentioned first object, claim 7
In the invention described above, the predetermined initial window in claim 6 is configured to be designated by the input device at the time of startup.

In order to achieve the first object, the invention as set forth in claim 8
In the above invention, the predetermined initial window in claim 6 is configured to be read from a predetermined storage means at the time of starting.

In order to achieve the above-mentioned second object, claim 9
According to another aspect of the present invention, in a graphics processing device having a function of changing the size of a window, a window size designating unit for designating a window size after the modification with a predetermined aspect ratio, and a window size designating unit designated by the window size designating unit A character size determining means for determining the character size according to the window size by the number of pixels in consideration of the resolution of the display screen, and a character display column size according to the changed window size designated by the window size designating means are displayed. A column size determining unit that determines the number of pixels in consideration of the screen resolution, and a window size corresponding to the character display column size determined by the column size determining unit are determined by the number of pixels in consideration of the resolution of the display screen. Window size determining means and window size determining means With changing the window size to the determined size by, for characters at least as a window display content and a changing means for changing the character size determined by the character size determination means.

In order to achieve the second object, claim 1
In the invention described in 0, the window size designating means in claim 9 is configured to designate the window size by selecting one from a plurality of window sizes having a predetermined aspect ratio registered in advance. ing.

In order to achieve the second object, the claim 1
In the invention described in claim 1, the window size designating means in claim 10 has a display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance.

In order to achieve the second object, the first aspect
In the invention described in claim 2, the window size designating means in claim 10 has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance.

In order to achieve the above-mentioned second object, claim 1
According to the third aspect of the invention, the window for which the changed window size is designated by the window size designating means in claim 9 is the window being displayed.

In order to achieve the second object, the invention according to claim 1
According to the invention described in claim 4, the window whose window size after change is designated by the window size designating means in claim 9 is a predetermined initial window.

In order to achieve the second object, the first aspect is provided.
In the invention described in claim 5, the predetermined initial window in claim 14 is configured to be designated by the input device at the time of starting.

In order to achieve the second object, the claim 1
According to the sixth aspect of the invention, the predetermined initial window in claim 14 is configured to be read from a predetermined storage means at the time of starting.

In order to achieve the above-mentioned second object, claim 1
In the invention according to claim 7, the character size determining means in claim 1 selects one from the character fonts registered in advance according to the changed window size designated by the window size designating means, The character size of the selected character font is determined by the number of pixels in consideration of the resolution of the display screen.

[0025]

According to the first aspect of the invention, the window size designating means designates the changed window size according to a predetermined aspect ratio, and the column size determining means comprises:
The character display column size corresponding to the changed window size designated by the window size designating unit is determined by the number of pixels in consideration of the resolution of the display screen, and the window size determining unit is determined by the column size determining unit. The window size according to the selected character display column size is determined by the number of pixels in consideration of the resolution of the display screen, and the changing unit changes the window size to the size determined by the window size determining unit and Even if the size of the window is changed by changing the size of the display contents, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates changes, and the characters that can be displayed in the window are changed. Make sure that the number of rows and columns does not change.

According to a second aspect of the present invention, the window size designating means in the first aspect is one of a plurality of window sizes having a predetermined aspect ratio registered in advance.
If you change the size of the window by specifying the window size by selecting one, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates will change, or the window The number of lines and columns of characters that can be displayed on the screen does not change, and the effort for specifying the changed size while maintaining a predetermined aspect ratio is reduced.

In the invention according to claim 3, the window size designating means in claim 2 has a display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance. , Even if the size of the window is changed, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates does not change, and the number of lines or columns of characters that can be displayed in the window does not change. In addition, it is possible to further reduce the labor when designating the changed size while maintaining a predetermined aspect ratio.

According to a fourth aspect of the present invention, the window size designating means in the second aspect has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance, and the window size. Even if is changed, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates does not change, and the number of lines or columns of characters that can be displayed in the window does not change. (EN) The effort for designating a subsequent size while maintaining a predetermined aspect ratio is reduced, and further, the number of specifiable window sizes can be increased relatively easily.

According to a fifth aspect of the invention, the window for which the window size after change is designated by the window size designating means according to the first aspect is configured to be the window being displayed, and the window size. Even if is changed, the function that prevents the relative relationship between the display position specified by the real coordinates and the display position specified by the column coordinates from changing, and the number of lines or columns of characters that can be displayed in the window does not change, For example, it is executed during the graphic processing.

According to a sixth aspect of the invention, the window for which the window size after the change is designated by the window size designating means in the first aspect is configured to be a predetermined initial window, and the window size is set. Even if you change it, there is a function that prevents the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates from changing, and the number of lines or columns of characters that can be displayed in the window from changing. It should be executed immediately when the graphics processing device is started.

According to a seventh aspect of the invention, the predetermined initial window in the sixth aspect is configured to be designated by the input device at the time of start-up, and even if the size of the window is changed, the actual coordinates are changed. A function that prevents the relative relationship between the specified display position and the display position specified by column coordinates from changing or the number of lines or columns of characters that can be displayed in the window from changing does not change immediately, for example, when the graphics processing device is started. To be done.

In the invention according to claim 8, the predetermined initial window in claim 6 is configured to be read from a predetermined storage means at the time of starting, and even if the size of the window is changed, the actual window is not changed. The relative relationship between the display position specified by the coordinates and the display position specified by the column coordinates changes,
The function of preventing the number of rows and columns of characters that can be displayed in the window from changing does not change, for example, immediately and easily when the graphic processing device is activated.

According to a ninth aspect of the present invention, the window size designating means designates the changed window size according to a predetermined aspect ratio, and the character size determining means designates the changed window size designated by the window size designating means. The character size according to the window size is determined by the number of pixels in consideration of the resolution of the display screen, and the column size determining means determines the character display column according to the changed window size designated by the window size designating means. The size is determined by the number of pixels in consideration of the resolution of the display screen, and the window size determining unit determines the window size according to the character display column size determined by the column size determining unit in consideration of the display screen resolution. The number of pixels is determined, and the changing unit is the window size determining unit. Even if the window size is changed by changing the window size to the size determined by the above, and changing at least the characters as the window display contents to the character size determined by the character size determining means. Make sure that characters are not widely spaced or overlapped.

According to a tenth aspect of the present invention, the window size designating means in the ninth aspect designates a window size by selecting one from a plurality of window sizes having a predetermined aspect ratio registered in advance. By doing so, even if the size of the window is changed, the spacing between characters will not unnaturally widen and the characters will not overlap and be displayed, and the changed size can be specified while maintaining a predetermined aspect ratio. Try to reduce the effort when doing.

According to an eleventh aspect of the present invention, the window size designating means in the tenth aspect includes display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance. ,
Even if you change the size of the window, the spacing between characters will not unnaturally increase and the characters will not be displayed overlapping, and the effort to specify the changed size while maintaining the specified aspect ratio. To be reduced.

According to a twelfth aspect of the present invention, the window size designating means in the tenth aspect has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance, and the window size. Even if you change, the character spacing will not be unnaturally widened and the characters will not be displayed overlapping, and the effort to specify the changed size while maintaining the predetermined aspect ratio will be reduced. Furthermore, the number of window sizes that can be specified can be increased relatively easily.

According to the thirteenth aspect of the present invention, the window for which the changed window size is designated by the window size designating means in the ninth aspect is configured to be the window being displayed, and the window size. Even if you change the,
The function of preventing characters from being displayed in an overlapping manner is executed, for example, in the middle of graphic processing.

In a fourteenth aspect of the invention, the window for which the window size after change is designated by the window size designating means in the ninth aspect is configured to be a predetermined initial window, and the window size is set. Even if is changed, the function of preventing the characters from being unnaturally widened or overlapping the characters is immediately executed, for example, when the graphic processing device is started.

According to the fifteenth aspect of the present invention, the predetermined initial window in the fourteenth aspect is configured to be designated by the input device at the time of starting, and even if the window size is changed, it is unnatural. The function of preventing the characters from being widened or being overlapped and displayed is executed immediately when the graphic processing device is started, for example.

According to the sixteenth aspect of the present invention, the predetermined initial window in the fourteenth aspect is configured to be read from a predetermined storage means at the time of starting, and even if the size of the window is changed, it does not occur. A function of naturally increasing the interval between characters and preventing characters from being displayed in an overlapping manner is executed immediately and easily, for example, when the graphic processing device is started.

According to a seventeenth aspect of the present invention, the character size determining means according to the first aspect is one that corresponds to the changed window size designated by the window size designating means from among the previously registered character fonts. By selecting one and deciding the character size of the selected character font by the number of pixels in consideration of the resolution of the display screen, even if the size of the window is changed, the character spacing becomes unnaturally widened. , Characters are not displayed overlapping, and the operation to specify the character size is unnecessary.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a schematic configuration of a graphic processing device to which a window control device according to an embodiment of the present invention is applied. The graphic processing device is a central processing unit 1.
It has a storage device 2, an input device 3, a display device 4, and an information reading device 5.

The central processing unit 1 reads various programs from the storage device 2 or the information reading device 5, and performs various graphic processes and window control described later according to these programs. The storage device 2 or the central processing unit 1
In the register, data of character fonts such as character types such as Mincho typeface, Gothic type and character size such as 10 point and 12 point are stored in correspondence with the size of the window such as large, medium and small. .

A window is formed on the display device 4 under the control of the central processing unit 1. Here, the coordinate system in the window will be described.

As shown in FIG. 3, as the coordinate system in the window, a coordinate system in which the lower left point of the window is (0, 0), the right direction is X, and the upper direction is Y is the real coordinate system (XR,
YR), and the upper left column of the window is (1,1)
The coordinate system with X in the right direction and Y in the downward direction is defined as the column coordinate system (IX, IY). The real coordinate system corresponds to the resolution (the number of pixels) of the display screen of the display device 4 and is in units of pixels.

Here, the rectangle surrounding one character is called a character display column. In this embodiment, for example, as shown in FIG. 4, the number of character display columns in the window is predetermined, and the number of character display columns in the horizontal direction is NX and the number of character display columns in the vertical direction is NY. . Note that FIG. 4 shows NX
= 4, NY = 2. The width of the character display column is WC, the height is HC, and the width of the window is W.
If the height is HD and the height is HD, the relationship between the window size and the character display column size is

[Formula 1] WC = WD / NX

## EQU2 ## HC = HD / NY.

Further, the actual coordinates of the upper left point on the character display column indicated by the column coordinates (IX, IY) are (XR, YR).
Then, the relationship between the real coordinates and the column coordinates is

## EQU3 ## XR = (IX-1) WC

## EQU4 ## It is represented by YR = HD- (IY-1) HC.

The display positions of figures and characters displayed in the window are specified by either real coordinates or column coordinates. Normally, figures and single characters are specified by real coordinates, and character strings are specified by columns. Specified by coordinates. The display position of the window itself is designated by either real coordinates or column coordinates as necessary.

Next, the window control operation will be described with reference to the flowchart of FIG.

For example, in the state where the window shown in FIG. 4 is displayed on the display device 4, first, the size of the window after the size change is designated by the input device 3 such as a mouse (step S11). . This designation is, for example,
This is performed by designating and selecting a desired one from menu buttons (for example, large, medium, and small menu buttons) indicating the window size registered in advance and displayed on the display device 4. Note that the window sizes registered in advance have the same aspect ratio.

As described above, by designating the window size of the predetermined aspect ratio registered in advance by the menu button, it is possible to reduce the labor for designating the changed window size while maintaining the aspect ratio. it can.

When the size of the window after the size change is designated, the central processing unit 1 causes the data of the character font corresponding to the designated size of the window (character type such as Mincho typeface, Gothic typeface or 10-point type). , Data such as character size of 12 points) is read from the storage device 2 or the register of the central processing unit 1 and selected (step S).
12). Then, the size of the character font corresponding to the size of the specified window is calculated, and the optimum size of the character display column for the character size is determined (step S).
13). In this case, regarding the size of the character font, when the character size of 10 points is selected in consideration of the resolution of the display screen of the display device 4, the number of pixels per character corresponding to the 10 points is calculated. . The size of the character display column is also determined by the number of pixels in consideration of the resolution of the display screen of the display device 4.

It is also possible to fix the character font (particularly the character size) regardless of the size of the window without changing the character font according to the size of the window. In this case, the character font selection process of step S12 may be omitted, and the process may proceed to step S13 to determine the optimum character display column size corresponding to the window size specified in step S11. .

Next, the central processing unit 1 operates as described above.
Number of horizontal and vertical character display columns in window N
Since X and NY are determined in advance, the size of the window corresponding to the size of the character display column determined in step S13 is determined based on equations 1 and 2 (step S).
14). In this case, the size of this window is also determined by the number of pixels in consideration of the resolution of the display screen of the display device 4.

Then, the size of the window on the display screen of the display device 4 is changed to the size determined in step S14, and the display content of the window is enlarged / reduced (step S15). The enlargement / reduction processing of the display contents of this window is performed by changing the display scale according to the scale of the window and re-displaying it on the display device 4 for the elements such as figures designated by the real coordinates, and the column coordinates are displayed. For the element such as the character string designated in step S12, the character font selected in step S12 is used, and the display scale is changed according to the size of the character display column determined in step S13. It is done by redisplaying.

As a result, for example, if "large" is specified as the size of the window after the change with respect to the window of FIG. 4, the window is enlarged without changing the aspect ratio as shown in FIG. In addition, the size of the character display column and the characters and figures in the window are optimally expanded. In other words, even if the size of the window is changed, the relative relationship between the display position specified by the actual coordinates and the display position specified by the column coordinates will change, and the number of lines and columns of characters that can be displayed in the window will change. It does not change, the characters are not unnaturally widened, and the characters are not overlapped and displayed.

When the character font is fixed,
It is possible to prevent the relative relationship between the display position specified by the real coordinates and the display position specified by the column coordinates from changing, and the number of rows and columns of characters that can be displayed in the window from changing.
The series of processes described above is executed in the state where the window is displayed on the display device 4, that is, in the middle of the graphic process.

The present invention is not limited to the above-described embodiment. For example, the window to be changed is not limited to the one already displayed on the display device 4, but the window,
Also, the initial window size at startup is designated by the input device 3 such as a keyboard from the state in which no figure or character is displayed in the window, or a preset initial window size is stored in the storage device 2 or the central processing unit 1.
It is also possible to immediately execute the above window control at the time of starting the graphic processing device by reading from the register of FIG.

In the above embodiment, the data of the character font registered in advance is read according to the size of the window designated in step S11 (step S1).
2) After calculating the size of the character font, the optimum size of the character display column for the character font is determined (step S13), but steps S12 and S
After reversing the order of step 13 and determining the size of the character display column according to the size of the window specified in step S11, the optimum character font for the character display column is selected, It is also possible to read data.

Further, the window size can be specified without depending on the menu button, for example, by providing a predetermined button switch in the input device 3 and continuously operating this button switch to, for example, an enlargement ratio for a window of a basic size. 9
It is also possible to specify the sizes of a plurality of windows having a predetermined aspect ratio by changing such values as 8%, 99%, 100%, 101%. In this case, the number of specifiable window sizes can be increased relatively easily.

[0062]

As described in detail above, according to the invention of claim 1, the window size designating means is
The changed window size is designated by a predetermined aspect ratio, and the column size determination means considers the resolution of the display screen as the character display column size according to the changed window size designated by the window size designation means. And the window size determining means determines the window size according to the character display column size determined by the column size determining means by the number of pixels in consideration of the resolution of the display screen, and the changing means. Changes the window size to the size determined by the window size determining means, and also changes the size of the window display content. Therefore, even if the window size is changed, the display position and the column specified by the actual coordinates are changed. The relative relationship with the display position specified by the coordinates changes, or it can be displayed in the window. Character number of rows and number of columns so that does not change that.

According to the ninth aspect of the invention, the window size designating means designates the changed window size according to the predetermined aspect ratio, and the character size determining means designates the window size designating means. The character size according to the changed window size is determined by the number of pixels in consideration of the resolution of the display screen, and the column size determination means determines the character according to the changed window size designated by the window size designating means. The display column size is determined by the number of pixels in consideration of the resolution of the display screen, and the window size determining unit considers the window size corresponding to the character display column size determined by the column size determining unit in consideration of the display screen resolution. Then, the changing means determines the window size determining procedure. Since the window size is changed to the size determined by, and at least the characters as the window display contents are changed to the character size determined by the character size determining means, even if the window size is changed, it is unnatural. The space between the characters will be wide, and the characters will not overlap.

[Brief description of drawings]

FIG. 1 is a flowchart showing a window control operation according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a graphic processing device to which a window control device according to an embodiment of the present invention is applied.

FIG. 3 is an explanatory diagram for explaining a relationship between an actual coordinate system and a column coordinate system.

FIG. 4 is a diagram showing a window display example before performing window control according to an embodiment of the present invention.

FIG. 5 is a diagram showing a window display example after performing window control according to an embodiment of the present invention.

FIG. 6 is a diagram showing a window display example corresponding to the first conventional problem.

FIG. 7 is a diagram showing a window display example corresponding to a second conventional problem.

[Explanation of symbols]

 1 ... Central processing unit 2 ... Storage device 3 ... Input device 4 ... Display device 5 ... Information reading device

Claims (17)

[Claims] 1. A graphic processing device having a function of changing the size of a window, a window size designating means for designating a window size after the modification according to a predetermined aspect ratio, and a window size designating means after the modification designated by the window size designating means. A column size determining means for determining the character display column size according to the window size by the number of pixels in consideration of the resolution of the display screen, and a window size according to the character display column size determined by the column size determining means for the display screen A window size determining unit that determines the number of pixels in consideration of the resolution, and a changing unit that changes the window size to the size determined by the window size determining unit and changes the size of the window display content. A window control device characterized by the above. 2. The window size specifying means specifies the window size by selecting one from a plurality of window sizes having a predetermined aspect ratio registered in advance. Window controller. 3. The window control device according to claim 2, wherein the window size designation means has a display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance. . 4. The window control device according to claim 2, wherein the window size designating means has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance. 5. The window control device according to claim 1, wherein the window for which the changed window size is designated by the window size designation means is the window being displayed. 6. The window control device according to claim 1, wherein the window for which the changed window size is designated by the window size designation means is a predetermined initial window. 7. The window control device according to claim 6, wherein the predetermined initial window is designated by an input device at the time of starting. 8. The window control device according to claim 6, wherein the predetermined initial window is read from a predetermined storage means at the time of starting. 9. A graphic processing device having a function of changing the size of a window, the window size specifying means for specifying the changed window size according to a predetermined aspect ratio, and the changed size specified by the window size specifying means. A character size determining unit that determines the character size according to the window size by the number of pixels in consideration of the resolution of the display screen, and the character display column size according to the changed window size specified by the window size specifying unit is displayed. A column size determining unit that determines the number of pixels in consideration of the screen resolution, and a window size corresponding to the character display column size determined by the column size determining unit are determined by the number of pixels in consideration of the display screen resolution. Window size determination means and window size determination The window size is changed to the size determined by the column, and at least the character as the window display content is changed to the character size determined by the character size determining means. Control device. 10. The window size designating unit designates the window size by selecting one from a plurality of window sizes having a predetermined aspect ratio registered in advance. Window controller. 11. The window control device according to claim 10, wherein the window size designating means has a display control means for displaying a menu button indicating a plurality of window sizes having a predetermined aspect ratio registered in advance. . 12. The window control device according to claim 10, wherein the window size designating means has an operating means for designating a plurality of window sizes having a predetermined aspect ratio registered in advance. 13. The window for which the window size after change is designated by the window size designation means is
10. The window control device according to claim 9, wherein the window is being displayed. 14. The window whose window size after change is designated by the window size designating means is
10. The predetermined initial window, which is a predetermined initial window.
Window control device described. 15. The predetermined initial window is specified by an input device at startup.
4. The window control device described in 4. 16. The window control device according to claim 14, wherein the predetermined initial window is read from a predetermined storage means at the time of starting. 17. The character size determining means selects one of the previously registered character fonts according to the changed window size designated by the window size designating means, and the selected character font is selected. 2. The window control device according to claim 1, wherein the character size is determined by the number of pixels in consideration of the resolution of the display screen.