JPH04123448U - graphic display device - Google Patents

Abstract

(57) [Summary] [Purpose] To display figures in real time so that the figures do not disappear even when multiple lines overlap, and figures that are not targeted can be displayed without disappearing. [Structure] The line pattern number is determined based on the contents of the drawing number register (S2), the range of graphic data to be edited is specified by the cursor, and the address of the display memory 13c is determined based on the display position of the cursor. (S3). next,
From the obtained address, the exclusive OR of the graphic data stored in the display memory 13c and the line pattern specified by the drawing number register is calculated, and the calculation result is stored in the display memory 13c (S4 ). The contents of the drawing number register are incremented by 1 (S5). Then, it is determined whether or not all line processing has been completed (S6), and the above-described processing is repeatedly executed until all line processing is completed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a graphic display device that displays graphics in real time.

0002

[Conventional technology]

Traditionally, document creation devices such as Japanese word processors have not been able to handle figures drawn with lines. There are some that have a drawing function that can be displayed. In this type of document creation device, graphic When editing (moving, copying, etc.), display the shape in real time. in this case, Specify the range to edit and select the target shape (stored in display memory) within that range. It calculates the exclusive OR with the line pattern and displays the figure based on the calculation result. Common. The reason for using exclusive OR is that exclusive OR is applied to the target shape. If you want to erase the shape, perform exclusive OR on the target shape. By performing the calculation again, you can avoid erasing the already drawn shapes that are not the target. This is because only the target figure can be erased.

0003

[Problem that the idea aims to solve]

However, when using this method, if there are an even number of lines on the same line, the overlapped areas will disappear. For example, a rectangular figure as shown in Figure 6(A) and a rectangular figure as shown in Figure 6(B). If there are straight line figures and these figures are displayed in the positional relationship as shown in Figure 6(C), , perform exclusive OR on the lines that make up both figures using the line pattern shown in Figure 7. When calculated and displayed, it will look like Figure 6 (D), and the line will disappear where the two lines overlap. Put it away. In other words, as shown in Figure 8, figures that are on the same line are calculated by exclusive OR. It has the disadvantage that if the exclusive OR is further calculated, it disappears.

0004 Also, avoid drawing a second line on a line that has already been written using exclusive OR. Another method is possible, but in this case, it is necessary to check whether a line has already been drawn at the planned location. The drawback is that the drawing process takes time because it needs to be confirmed.

[0005] The problem with this idea is that when displaying shapes in real time, multiple lines overlap. Also, shapes do not disappear, and shapes that are not targeted can be displayed without disappearing. That's true.

[0006]

[Means to solve the problem]

The means of this invention are as follows. Input means 1 (see the functional block diagram of FIG. 1, the same applies hereinafter) inputs a figure. The storage means 2 stores the figures input by the input means 1. The display means 3 displays the graphics stored in the storage means 2. The selection means 4 selects a line pattern for displaying a figure. The display control means 5 stores the line pattern selected by the selection means 4 and the storage means 2. An exclusive OR with the stored figure is calculated and the figure is displayed based on the calculation result.

[0007]

[Effect]

The function of this device is as follows. The figure input by the input means 1 is stored in the storage means 2 and displayed on the display means 3. be done. When displaying shapes in real time, the line pattern for displaying the shapes is The selected line pattern is selected by the selection means 4, and the display control means 5 displays the selected line pattern and the memory hand. Calculate the exclusive OR with the figure stored in stage 2 and display the figure based on the operation result. Let me show you. Therefore, when displaying a shape in real time, the shape will disappear even if multiple lines overlap. It is possible to display non-target figures without erasing them.

[0008]

【Example】

Hereinafter, one embodiment will be described with reference to FIGS. 2 to 5. In addition, in the example, the figure is An example applied to a displayable Japanese word processor is shown below. Figure 2 is a Japanese wordpress. FIG. 2 is a block diagram showing a circuit configuration of a processor. The input section 11 is used to input characters and figures. Ru. Characters and figures input from the input section 11 are input to the CPU 12. CPU1 2 controls each section based on a pre-stored control program; the input section 1 1, a RAM 13, a display section 14, a printing section 15, and an external storage section 16 are connected. It is. Then, the CPU 12 stores the characters and figures input from the input unit 11 in the RAM. 13 to memorize it. The RAM 13 stores character and graphic data under the control of the CPU 12. Writing/reading is performed in the document data area 13a and the work area 13. b. It is equipped with a display memory 13c. The display memory 13c is displayed on the display section 14. This is a memory that stores the display data to be displayed, and one bit is recorded for one display dot. If the storage area corresponds and the bit content is "1", the display dot lights up.

[0009] The display unit 14 is composed of, for example, a dot matrix type liquid crystal display device, and displays documents. Display data and graphical data. The printing unit 15 is, for example, a thermal printer. Prints document data and graphic data. External storage unit 1 6 stores document data and graphic data read from the RAM 13.

0010 Next, the operation of the above embodiment will be explained. The figure input from the input section 11 is stored in the RAM. 13 document data area 13a. Then, it is stored in the document data area 13a. The stored graphics are subjected to an exclusive OR operation with the display memory 13c, and displayed on the display section 14. will be displayed. When editing a shape in real time (move, copy, etc.), first Specify a range using a cursor, etc., and display the target shape within that range as a memo. The exclusive OR of the line pattern 13c and the line pattern is calculated and displayed.

[0011] Figures 3 (1) to (4) show four line patterns that have been simplified for real-time display. FIG. In this case, each line pattern is one dot of the line pattern in Figure 3 (1). It is shifted by one step.

0012 In the drawing process, when drawing multiple lines, the first line is the line pattern shown in Figure 3 (1). , the second line is the line pattern shown in Figure 3(2), the third line is the line pattern shown in Figure 3(2), and the fourth line is the line pattern shown in Figure 3(2). 3 (4) line pattern, the 5th line goes back to the beginning and becomes the line pattern in Figure 3 (1), and so on. , sequentially change the line pattern and calculate exclusive OR. Then, one line When displayed, it is displayed as shown in Figure 4 (1), and when two lines overlap, Figure 4 It will be displayed as shown in (2), and when three lines overlap, it will be displayed as shown in Figure 4 (3). shown. Below, as shown in Figure 4 (4), Figure 4 (5), Figure 4 (6), Figure 4 (7), and Figure 4 (8). displayed.

[0013] FIG. 5 is a flowchart showing the operation of the drawing process. First, in step S1 Binary data “000” is stored in the drawing number register (not shown) built into the CPU 12. 00000" to initialize the memory contents.

[0014] In step S2, the line pattern number is determined based on the contents of the drawing number register. demand. In other words, in this case, the content of the drawing number register is updated to "00000000". The logical product (AND) with the data “00000011” is calculated, and the line pattern No. “ 00000000" is required. In this case, line pattern No. “0000000 0'' specifies the line pattern shown in FIG. 3(1). Similarly, line pattern No. "00000001" is the line pattern shown in Figure 3 (2), line pattern No. "0000 0002" is the line pattern shown in Figure 3 (3), line pattern No. "00000003" corresponds to the line pattern shown in FIG. 3(4).

[0015] In the following step S3, the range of graphic data to be edited is specified with the cursor. Then, the address of the display memory 13c is determined based on the display position of the cursor. child Here, the display position specified by the cursor may be specified by the start point and end point, or In some cases, a rectangular range is specified.

[0016] In step S4, the display memory 13 is The graphic data stored in c and the specified line pattern, that is, the line pattern in Figure 3 (1) The exclusive OR is calculated, and the calculation result is stored in the display memory 13c. child As a result, the graphic data is displayed in a line pattern as shown in FIG. 4(1).

[0017] Next, in step S5, the contents of the drawing number register "00000000" are +1, in this case "00000001".

[0018] In step S6, it is determined whether or not all line processing has been completed, that is, all the graphic data to be edited is checked. It is then determined whether or not the drawing process has been completed. In step S6, it is determined as YES. If the answer is NO, the process of FIG. 5 is ended, and if the answer is NO, the process returns to step S2.

[0019] In this case, there is still graphic data to be processed, so in step S6 If NO is determined, the process returns to step S2. Below, write the drawing number register in the same way as above. Logical AND (AN) of content “00000001” and update data “00000011” D) is calculated, and line pattern No. "00000001" is obtained. in this case, Line pattern No. "00000001" specifies the line pattern shown in FIG. 3(2). In step S3, the range of graphic data to be edited is specified by the cursor, and The address of the display memory 13c is determined based on the display position of the cursor. step In S4, the address obtained in step S3 is stored in the display memory 13c. The exclusive OR of the drawn graphic data and the line pattern in Figure 3 (2) is calculated, and the calculation result is calculated. The results are stored in the display memory 13c. As a result, the line pattern shown in Figure 4(2) The shape data is displayed on the screen. Next, in step S5, the drawing number register The contents of the data "00000001" are incremented by 1 to become "00000002". below , steps S2 to S6 are performed in the same manner as described above until YES is determined in step S6. The process is executed repeatedly.

[0020]

[Effect of the idea]

According to this invention, real-time display that calculates exclusive OR when editing shapes By shifting the line pattern one by one, even if multiple lines overlap, the shape does not disappear, and non-target figures can be displayed without disappearing. follow This allows you to check the display without increasing the amount of calculation.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of this invention.

FIG. 2 is a block diagram showing a circuit configuration.

FIG. 3 is a diagram showing a plurality of line patterns.

FIG. 4 is a diagram showing a display state of figures.

FIG. 5 is a flowchart showing the operation.

FIG. 6 is a diagram illustrating an example of graphic display.

FIG. 7 is a diagram showing an example of a line pattern.

FIG. 8 is a diagram showing a state in which graphic data is operated by exclusive OR.

[Explanation of symbols]

1...Input means 2...Storage means 3...Display means 4...Selection means 5...Display control means 11...Input section 12...CPU 13...RAM 14...Display section 15...Printing department 16...External storage unit

Claims (1)

[Scope of utility model registration request] 1. An input means for inputting a figure, a storage means for storing the figure input by the input means, a display means for displaying the figure stored in the memory means, and a line for displaying the figure. A selection means for selecting a pattern, and a display control means for calculating an exclusive OR of the line pattern selected by the selection means and the figure stored in the storage means and displaying the figure based on the calculation result. A graphic display device characterized by: