JPH07282286A - Graphic display device - Google Patents

Abstract

PURPOSE:To perform a drawing process in a short time and displays a figure to be edited in real time without making the figure to be edited at a part where plural lines constituting the figures to be edited overlap with each other disappear when the figure to be edited is displayed in real time by using an arithmetic result as display data by exclusively ORing a line pattern generated on the basis of figure data on the figure to be edited with display data stored in a display memory. CONSTITUTION:A line pattern No. is found from the contents of a drawing No. register (S2), the range of graphic data to be edited is specified with a cursor, and the address of the display memory 13c is found on the basis of the display position of the cursor (S3). Then the graphic data stored in the display memory 13c from the found address and the line pattern specified by the drawing No. register are exclusively ORed and the arithmetic result is stored in the display memory 13c (S4). The contents of the drawing No. register are increased by one (S5). Then it is judged that the processing of all lines is completed (S6) and the processing is repeatedly performed until the processing of all the lines is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic display device for displaying a graphic to be edited in real time.

[0002]

2. Description of the Related Art Conventionally, some document creating apparatuses such as Japanese word processors have a drawing function capable of displaying figures drawn by lines. When editing (moving, copying, etc.) a figure in this type of document creation apparatus, the figure to be edited is displayed in real time. In this case, a range to be edited is specified, a line pattern is generated by the target figure (stored in the display memory) within that range, the exclusive OR of this line pattern and display data is calculated, and the calculation result It is common to display graphics based on. The reason for using the exclusive OR is that when the exclusive OR is calculated for the target figure, when the figure is erased, the exclusive OR is again calculated for the target figure,
This is because it is possible to erase only the target graphic without erasing the already written non-target graphic.

[0003]

However, when this method is used, if there are even-numbered lines on the same line, the overlapping portions disappear. For example, there are a rectangular figure as shown in FIG. 5 (A) and a linear figure as shown in FIG. 5 (B), and when these figures are displayed in a positional relationship as shown in FIG. When the lines forming the figure are displayed by calculating the exclusive OR with the line pattern as shown in FIG. 6, the result becomes as shown in FIG. 5D, and the line disappears in the portion where the two lines overlap. That is, as shown in FIG. 7, the figures on the same line are operated by exclusive OR, and when the exclusive OR is further operated, they disappear.

A method may be considered in which the second line is not written on the line which has already been written by the exclusive OR, but in this case, it is confirmed whether the line has already been written at the planned location. Therefore, there is a drawback that drawing processing takes time.

An object of the present invention is to calculate the exclusive OR of the line pattern generated based on the graphic data of the graphic to be edited and the display data stored in the display memory, and the calculation result obtained by this calculation. When the figure to be edited is displayed in real time on the display screen as display data, even if multiple lines that make up the figure to be edited overlap, the figure to be edited does not disappear in the part where the multiple lines overlap The processing is performed in a short time so that the figure to be edited can be displayed in real time.

[0006]

Means for Solving the Problems The means of the present invention includes at least display storage means for storing display data for displaying a graphic on a display screen and graphic data for displaying a graphic drawn by a line. A plurality of graphic data storage means to be stored and a plurality of edit target graphics are designated from the plurality of graphic data stored in the graphic data storage means, and the plurality of designated edit target graphics are displayed on the display screen. In this case, the graphic data corresponding to the plurality of editing target graphics are read one by one from the graphic data storage means, and the graphic corresponding to the graphic data is drawn based on the read graphic data. A line pattern is generated, the exclusive OR of the generated line pattern and the display data stored in the display storage means is calculated, and the operation obtained by this calculation is performed. A display control means for writing the result as new display data in the display storage means and displaying a graphic based on the written display data, wherein the display control means edits the graphic data storage means. Each time the graphic data corresponding to the graphic is read out, a line pattern having a different pattern structure is generated so that the generated line pattern does not match the display data of the graphic to be edited already stored in the display storage means. It is characterized by

[0007]

The operation of the means of the present invention is as follows. When a plurality of edit target graphics are designated from the plurality of graphic data stored in the graphic data storage means and the designated plurality of edit target graphics are displayed on the display screen, the display control means controls the graphic data. The graphic data corresponding to a plurality of graphics to be edited are read one by one from the storage means, and a line pattern for drawing a graphic corresponding to this graphic data is generated based on the read graphic data. The exclusive OR of the generated line pattern and the display data stored in the display storage means is calculated, the calculation result obtained by this calculation is written as new display data in the display storage means, and this written data is written. The display control means displays the figure based on the display data, and the display control means changes the pattern configuration every time the figure data corresponding to the figure to be edited is read from the figure data storage means. The composed line pattern occurs, already display data edited graphic stored is prevented match the display memory means the generated a line pattern.

Therefore, the exclusive OR of the line pattern generated based on the graphic data of the graphic to be edited and the display data stored in the display memory is calculated, and the calculation result obtained by this calculation is used as the display data. When the figure to be edited is displayed on the display screen in real time, even if multiple lines that compose the figure to be edited overlap, the figure to be edited in the part where the multiple lines overlap does not disappear, and the drawing process can be performed for a short time. You can display the figure to be edited in real time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. The embodiment shows an example applied to a Japanese word processor capable of displaying graphics. FIG. 1 is a block diagram showing the circuit configuration of a Japanese word processor. The input unit 11 inputs characters and figures. The characters and figures input from the input unit 11 are input to the CPU 12. The CPU 12 controls each unit based on a control program stored in advance, and in addition to the input unit 11, the RAM 13, the display unit 14,
The printing unit 15 and the external storage unit 16 are connected.
Then, the CPU 12 causes the characters input from the input unit 11,
The graphic is stored in the RAM 13. RAM 13 is a CPU
Character / graphic data is written / read out under the control of 12, and includes a document data area 13a, a work area 13b, and a display memory 13c. The display memory 13c is a memory for storing display data displayed on the display unit 14, and a 1-bit storage area corresponds to one display dot, and if the bit content is "1", the display dot is lit. .

The display unit 14 is composed of, for example, a dot matrix type liquid crystal display device, and displays document data and graphic data. The printing unit 15 is composed of, for example, a thermal printer, and prints document data and graphic data. The external storage unit 16 stores the document data and the graphic data read from the RAM 13.

Next, the operation of the above embodiment will be described. The graphic input from the input unit 11 is stored in the document data area 13a of the RAM 13. Then, the document data area 13a
The graphic stored in is calculated by exclusive OR with the display memory 13c and displayed on the display unit 14. In the case of real-time editing (moving, copying, etc.) of a figure, the range is first designated by a cursor or the like, and the figure of interest within the range is subjected to the exclusive OR of the display memory 13c and the line pattern. Is displayed.

FIGS. 2 (1) to 2 (4) are diagrams showing four line patterns prepared for real-time display. In this case, each line pattern is obtained by shifting the line pattern of FIG. 2A by 1 dot.

When a plurality of lines are drawn in the drawing process, the first line is the line pattern shown in FIG. 2 (1) and the second line is the line pattern shown in FIG. 2 (2).
2), the third line pattern of FIG. 2 (2), the fourth line pattern of FIG. 2 (4), and the fifth line of FIG.
Like the line pattern of (1), the line patterns are sequentially changed and the exclusive OR is calculated. Then, when one line is displayed, it is displayed as shown in FIG. 3 (1), and when two lines overlap, it is displayed as shown in FIG. 3 (2).
When the lines of the book overlap, they are displayed as shown in FIG. 3 (4), 3 (5), 3 (6), 3 (7),
It is displayed as shown in FIG.

FIG. 4 is a flow chart showing the operation of the drawing process. First, in step S1, the binary data "0" is stored in the drawing No. register (not shown) built in the CPU 12.
"0000000" is written to initialize the stored contents.

In step S2, the line pattern number is obtained based on the contents of the drawing number register. That is, in the present case, the content of the drawing No. register is "00000000".
AND the update data “00000011” (AN
D) is calculated to obtain the line pattern number "00000000". In this case, the line pattern No. "000000
00 "designates the line pattern shown in FIG. Similarly, the line pattern No. “00000001” is the line pattern shown in FIG.
002 "is the line pattern and line pattern No. shown in FIG.
“00000003” corresponds to the line pattern shown in FIG.

In the following step S3, the range of the graphic data to be edited is designated by the cursor, and the address of the display memory 13c is obtained based on the display position of the cursor. Here, the display position designated by the cursor may be designated by a start point and an end point, or may be designated by a rectangular range.

In step S4, the exclusive OR of the graphic data stored in the display memory 13c and the designated line pattern, that is, the line pattern of FIG. 2A is calculated from the address obtained in step S3. The calculation result is stored in the display memory 13c. As a result, the graphic data is displayed in the line pattern as shown in FIG.

Next, in step S5, the content "00000000" of the drawing No. register is incremented by 1 to "00000001" in this case.

In step S6, it is determined whether or not all line processing has been completed, that is, whether or not drawing processing has been completed for all graphic data to be edited. If it is determined to be YES in step S6, the process of FIG. 4 is terminated, and if NO, the process returns to step S2.

In this case, since graphic data to be processed still remains, NO is determined in step S6 and the process returns to step S2. Hereinafter, as in the above, the contents of the drawing No. register “0000001” and the update data “0000”
0011 ”and the logical product (AND) to calculate the line pattern.
No. "00000001" is required. In this case, the line pattern No. “00000001” specifies the line pattern shown in FIG. In step S3, the range of the graphic data to be edited is designated by the cursor, and the address of the display memory 13c is obtained based on the display position of the cursor. In step S4, the exclusive OR of the graphic data stored in the display memory 13c and the line pattern of FIG. 2B is calculated from the address obtained in step S3, and the calculation result is stored in the display memory 13c. Remembered. As a result, the graphic data is displayed in the line pattern as shown in FIG. Next, in step S5, the content "00000001" of the drawing No. register is incremented by 1 to "00".
000002 ". Hereinafter, the processes of steps S2 to S6 are repeatedly executed in the same manner as described above until YES is determined in step S6.

When the edit target graphic is erased, for example, when the edit target graphic is drawn at a new display position according to the edit processing, the exclusive OR of the edit target graphic by the drawing processing of FIG. 4 is performed. By again calculating, it is possible to erase only the edit target graphic without erasing other graphics other than the edit target graphic already written in the display memory 13c.

[0022]

According to the present invention, the exclusive OR of the line pattern generated based on the graphic data of the graphic to be edited and the display data stored in the display memory is calculated, and the exclusive OR is obtained by this calculation. When the figure to be edited is displayed in real time on the display screen with the calculation result as display data,
Even if multiple lines that make up the edit target figure overlap, the edit target figure in the part where the multiple lines overlap does not disappear,
The drawing process can be performed in a short time and the figure to be edited can be displayed in real time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration.

FIG. 2 is a diagram showing a plurality of line patterns.

FIG. 3 is a diagram showing a display state of graphics.

FIG. 4 is a flowchart showing an operation.

FIG. 5 is a diagram showing a display example of a graphic.

FIG. 6 is a diagram showing an example of a line pattern.

FIG. 7 is a diagram showing a state in which graphic data is calculated by exclusive OR.

[Explanation of symbols]

 11 ... Input section 12 ... CPU 13 ... RAM 14 ... Display section 15 ... Printing section 16 ... External storage section

Claims (1)

[Claims] 1. A display storage unit for storing at least display data for displaying a graphic on a display screen, and a graphic data storage unit for storing a plurality of graphic data for displaying a graphic drawn by a line. When a plurality of edit target graphics are designated from the plurality of graphic data stored in the graphic data storage means and the designated plurality of edit target graphics are displayed on the display screen, The graphic data corresponding to the plurality of graphics to be edited are read out one by one, and a line pattern for drawing a graphic corresponding to this graphic data is generated based on the read graphic data. The exclusive OR of the line pattern and the display data stored in the display storage means is calculated, and the calculation result obtained by this calculation is used as new display data. Display control means for writing in the display storage means and displaying a figure based on the written display data, wherein the display control means reads out the figure data corresponding to the figure to be edited from the figure data storage means. A graphic display device characterized in that a line pattern having a different pattern configuration is generated for each of them, and the generated line pattern and the display data of the edit target graphic already stored in the display storage means do not match. .