JPH0426475B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a screen display control device, especially when inputting characters, etc., even when the position to be input is outside the actual screen or outside the window. This invention relates to a screen display control device configured to make it clear.

[Problems to be solved by conventional technology and invention]

Conventionally, a part of a virtual screen is developed on a buffer memory, and the developed real screen is displayed on a display. In this case, the position where you are trying to input characters, etc., for example, the position indicated using the cursor, is outside the range of the actual screen that can be displayed on the display, making it difficult to determine in which position the characters, etc. will be input. There was a problem. Similarly, even if a window is set up on the real screen, if the cursor is located outside the window even if it is within the real screen, the cursor will not be displayed and characters etc. can be entered at any position. There was a problem in that it was difficult to know whether it would be done or not.

Although not directly related to the claimed invention, enlarged characters, etc. are not displayed on the boundaries of the real screen or the boundaries of windows provided on the real screen, so generally the number of characters (lines or columns) is an even number. The configuration is such that boundaries can be provided only at positions, or the enlarged characters, etc. are displayed only when the enlarged characters, etc. are input at positions with an even number of characters. For this reason, there has been a problem in that restrictions arise when displaying boundaries, enlarged characters, etc.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides information that directs each signal on the real screen when the input position is outside the real screen when inputting characters, etc. By configuring the display to be displayed, it is possible to easily input characters, etc. on the real screen. Therefore, the screen display control device of the present invention is a screen display control device that controls a part of the virtual screen to be developed on a real screen and to display information in the virtual screen on the developed real screen. A real screen register that specifies an area to be mapped on the screen, a transfer means that transfers the area to be mapped specified by the real screen register to the real screen, and a position of a cursor existing in the virtual screen. a cursor register that specifies the area specified by the real screen register; and cursor position determining means that determines in which direction the cursor is positioned with respect to the area specified by the real screen register, the area specified by the cursor register. The present invention is characterized in that the information determined by the cursor position determining means is displayed on the real screen when the position of the cursor that is displayed is not within the area designated by the real screen register. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIG. 2 is a flowchart explaining the operation of the configuration of one embodiment of the present invention illustrated in FIG. 1, and FIG.
FIGS. 4 and 5 are operational conceptual diagrams for explaining the operational concept of the embodiment configuration. FIGS. 4 and 5 show a specific example using the embodiment configuration of the present invention shown in FIG. 1. FIG. 6 is an explanatory diagram of the case where the enlarged character is located on the boundary line.

In the figure, 1 is a control information storage unit, 1-1 is a real screen register, 1-2 is a cursor register, 1-3 is a boundary character register, 1-4 is a photo register, 2 is a virtual screen memory, and 3 is a real screen memory, 4
DMAC (Direct Memory Access Controller), 5 is CPU (Central Processing Unit), 6 is CRT
(Display device) controller, 7 represents a CRT driver, and 8 represents a CRT (display device).

In FIG. 1, a control information storage section 1 is related to the present invention and is for storing a pseudo cursor etc. on a CRT (display device) 8. In FIG.
The control information storage unit 1 includes a real screen register 1-1, a cursor register 1-2, and a boundary character register 1-3.
and font registers 1-4.

The real screen register 1-1 is used to specify an area to be mapped from the virtual screen memory 2 to the real screen memory ₃ . _DMAC in the figure
(Direct memory access controller)
4 for copying to the real screen memory 3.

The cursor register 1-2 is for holding the coordinates at which the cursor is located in the virtual screen memory 2.

The boundary character register 1-3 is for holding the position of characters, etc. existing on the boundary of the real screen memory 3 and the boundary of the window to be mapped.

The font registers 1-4 are for holding the fonts of pseudo cursors and pseudo characters to be stored on the real screen memory 3. The font may be specified using, for example, one of 80 _H to 9F _H , which are treated as JIS Kanji codes.

By adopting the above configuration, the real image information stored in the real screen memory 3 can be
It is displayed in a visually visible form on a CRT (display device) 8 via a CRT (display device) control 6 and a CRT driver 7. Note that the CPU (central processing unit) 5 is for executing the various controls and processes described above. The operation will be explained in detail below.

FIG. 2 shows a flowchart for explaining the operation of the configuration shown in FIG. The figure shows a state in which it is determined whether or not full-width or double-width characters, etc., exist at the boundaries of the real screen or at the boundaries of windows even within the real screen. If YES, execute the steps in the diagram.
If NO, execute the steps in the diagram.

The figure shows a state in which full-width or double-width characters, etc. are present on the boundary in the figure, and a process is performed to display this fact. This means, for example, as shown in FIG. 6, the presence of characters, etc. at the boundary is indicated using a graphic pseudo mark.

The figure shows a state in which a part of the virtual screen memory 2 is taken out and mapped to the real screen memory 3. This means that a part of the virtual screen memory 2 is taken out in the form of a window and mapped onto the real screen memory 3. The mapping is DMAC4 in Figure 1.
It is carried out by.

The figure shows a state in which it is checked whether the cursor position is within the area mapped in the figure.

The figure shows a state in which it is determined that as a result of checking in the figure, if the cursor exists within the mapping area, the program in the figure is executed, and if the cursor does not exist, the program in the figure is executed.

The figure shows a state in which the actual cursor is displayed in the mapping area because it has been determined that the cursor is present in the mapping area.

The figure shows a state in which a pseudo cursor is displayed in the screen mapping area because it has been determined that the cursor does not exist within the mapping area.

As a result of the above operations, if a full-width character exists on the border, a message to that effect will be displayed, and if the cursor is not displayed on the real screen, a pseudo cursor will be displayed on the real screen. This will be useful when handling the screen.

Next, using FIG. 3, when extracting a part of the virtual screen memory 2 and mapping it to the real screen memory 3, it is determined whether the cursor is located within the area to be mapped, and The operation of determining in which direction the area to be mapped will be described in detail.

The size _{of the area} e in FIG _.
The size of the mapping area x _L × y _L is, for example, the coordinates P (x ₀ , y ₀ ) of the upper left in the figure.
and the lengths x _L and y _L of the region to be mapped on the X and Y axes. Each value is held in the real screen register 1-1, and the mapping area is transferred from the virtual screen memory 2 to the real screen memory 3 by the DMAC 4.

In addition, each area indicated using a to d and f to i in the figure is based on the coordinates P (x ₀ , y ₀ ) stored in the real screen register 1-1 and the X-axis and Y-axis of the area to be mapped. These are calculated by the lengths x _L and y _L on the axis, respectively, and are stored in cursor registers 1-2.
If the position of the cursor specified by is in the area (an area other than area e), a pseudo cursor corresponding to each area is displayed on the real screen as shown in FIG. 5, which will be described later. In FIG. 5, areas other than the area e are indicated by diagonal lines. Furthermore, on the boundary of the area e to be mapped, full-width characters,
If a double-width character or the like exists, the coordinates of the existing character and information on the type of the existing character, such as a kanji character, are stored in the boundary character register 1-3 in FIG. Based on the information stored in the boundary character register 1-3, it is stored in the real screen memory 3 in the form of a pseudo mark in FIG. 6 and displayed on the real screen.

FIG. 4 shows a state in which a part of the virtual screen memory 2 is mapped to the real screen memory 3.

The mapping area in the figure is specified by the coordinates P (x 0 , y 0 ) of the upper left corner of the virtual screen memory 2 and the size x _L × y _L , and the mapping area is specified by the coordinates P (x ₀ , y ₀ ) of the upper left corner of the virtual screen memory 2 and the size x L × y L. is transferred to the desired area of 〓〓. next,
Since it is known that the position of the cursor in the virtual screen memory 2 corresponds to the area f in FIG. Store it at the right end of the area 〓〓. This makes it easy to know that the actual cursor is located on the right side of the mapped area.

FIG. 5 shows an example of displaying a pseudo cursor. Each area e in the center of the figure indicates a mapping area transferred to the real screen memory 3, which is indicated by 〓 〓 in Figure 4, and a to d, f to i in Figures 5 A to 5 are FIG. 3 shows an example of a pseudo cursor displayed when the cursor is positioned in each area in FIG. As described above, when the cursor is located outside the mapping area, screen handling becomes easier by displaying a pseudo cursor within the mapping area corresponding to the area where the cursor is located.

〔Effect of the invention〕

As explained above, according to the present invention, when inputting characters, etc., if the position to be input is not displayed on the real screen, the respective display is performed on the real screen, so that the actual You can easily input characters, etc. on the screen.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIG. 2 is a flowchart explaining the operation of the configuration of one embodiment of the present invention illustrated in FIG. 1, and FIG.
FIGS. 4 and 5 are operational conceptual diagrams for explaining the operational concept of the embodiment configuration. FIGS. 4 and 5 show a specific example using the embodiment configuration of the present invention shown in FIG. 1. FIG. 6 is an explanatory diagram of the case where the enlarged character is located on the boundary line. In the figure, 1 is a control information storage unit, 1-1 is a real screen register, 1-2 is a cursor register, 1-3 is a boundary character register, 1-4 is a font register, 2
is virtual screen memory, 3 is real screen memory, 4 is
DMAC (Direct Memory Access Controller), 5 is CPU (Central Processing Unit), 6 is CRT
(Display device) controller, 7 indicates a CRT driver, and 8 indicates a CRT (display device).

Claims (1)

[Claims] 1. In a screen display control device that controls a part of a virtual screen to be developed on a real screen and information in the virtual screen to be displayed on the developed real screen, an area to be mapped in the virtual screen is specified. a real screen register; a transfer means for transferring an area to be mapped specified by the real screen register to the real screen;
a cursor register that specifies the position of a cursor existing in the virtual screen; and a cursor position determination means that determines in which direction the cursor is positioned with respect to the area specified by the real screen register. and transmitting the information determined by the cursor position determining means onto the real screen when the cursor position specified by the cursor register does not exist within the area specified by the real screen register. A screen display control device configured to display a screen.