JPS605327A - Location appointing system with light pen - Google Patents

Abstract

PURPOSE:To realize correct location appointment and cursor position control with a light pen, by preparing data of picture element address extents and cursor display position to characters, figure, and symbols, as a light pen position appointing table. CONSTITUTION:When a symbol S is displayed over four picture elements of X2Y1, X3Y1, X2Y2, and X3Y2 as shown in the figure, the 1st display information becomes X1Y1 and final display information becomes X4Y2, and then, the display position information of a cursor K becomes X2Y2. If a hit is obtained at a picture element X4Y1 when picture information given from a picture file 5 is displayed on a CRT1 and the symbol S is selected by placing a light pen 2 onto the display section thereafter, its information is given to a control section 3. At the control section 3 comparative retrieval of the hit information with the first and final information stored in a table 4 is made and, if the hit information is registered, the cursor display position information X2Y2 of the registered block is read out and the cursor K is displayed on the CRT display section 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for positioning and specifying characters and figures using a light pen in a semi-graphic CRT display device.
In addition to fixed characters such as kana characters, special figures such as graphs and genealogical diagrams can be displayed on the CRT screen by combining each pattern, and the screen format is as shown in Figure 1, with the minimum display pixel size. It consists of a set of a. As the density of information increases, the number of constituent pixels per screen increases to 4.
The number of symbols is increasing from 000 symbols (2 letters and 2 figures) to 7000 symbols, and more information is being displayed on one screen. Moreover, as the number of displayed symbols increases, the pixel area per symbol decreases.
The visual recognition of the image [m and the designation of symbol position 1ρ by Light Ben makes me happy. In particular, in systems where screen operations are performed using a light ben, the deterioration in operability is a major problem. In addition, as shown in FIG. 2(A), in order to confirm the position specification of pixel a by the light ben with the cursor displayed in the image accumulation aOF area, four pixels at, at are shown in FIG. 2(fB). .

When specifying the position of one symbol S consisting of a+ and a4 with the light ben, the light ben selects pixel a! When you hit , the cursor K is displayed at the bottom of the image Jaw and the symbol S (r is collapsed, making it difficult to see.)
To specify the position jα by Lightven, the cursor is moved to the X and Y positions on the screen by capturing the scanning line on the CRT, but as shown in Fig. 2 fc), for example, pixels a, pixel a, When trying to specify the location, if the brightness of the scanning line is good, a light bend hit will occur when the scanning line is at pixel a or a8 position, and the cursor will be displayed at pixel a or 81st position 1d, or vice versa. When the scanning line is at low brightness, a cursor may be displayed at pixel a4 or a.

This problem can be corrected to some extent by adjusting the brightness of the CRT, but it is difficult to specify the position accurately, and the iX'41 point will also change over time.

The present invention prepares the data of the pixel address range and cursor display position for the character 2 figure symbol as a light ben position specification table, and enables reliable position specification and cursor position control even if the light ben hits anywhere within the pixel address range. The purpose is to obtain a single position designation system.

;+(,r, Figure 5 is a diagram showing the configuration of an apparatus according to an embodiment of the present invention. CRT display &li 1 has a semi-graphic display function by rask scanning, and has a video signal generator and a fixed pattern generator for this purpose. , variable pattern'
tb generator! Equipped with J Fresh memory, controller and interface, through the interface Light Ben 2 and other keyboards.

Exchanges display information and control information with the computer. The light pen control section 3 receives light benhit information from the CRT display section 1, searches for cursor display position information corresponding to the information, and provides the information to the CRT display section 1. The light pen position specification table 4 stores pixel address ranges and cursor display position information for displaying symbols of characters and figures in units of blocks for each symbol currently displayed on the CRT display section l. The screen file 5 stores various screen information displayed on the CRT display section.

Light Ben control section 3. The light ben position designation table 4 is assigned to, for example, the CPU and memory of a computer connected to a CRT display unit, and the screen file 5 is assigned to a magnetic recording device. Block information for each symbol stored in table 4 is as shown in the table below.

In this information, the display start information xn + ym and the final information Xp + Yq do not specify the symbol, but are the display start address xn + of the pixel address range in which a certain symbol is displayed.
'ym and the display final address Xp, Yq are stored in binary numbers,
Cursor display position information Xn+3. Ym+.

is stored as the pixel address of the cursor display position for the symbol displayed in the pixel address range.

For example, as shown in FIG. 4, a symbol S has pixel addresses X, , Y, -X, , Y, and X, Y, ~X, Y,
Pixel address X, , Y, , X, Y , X, Y within the range of
When displayed over four pixels of , , X, Y, the first information to be displayed is x, , y, and the last information to be displayed is
, , Y, None, the final information displayed on the cursor is set to X, Y-.

In such a configuration, screen information given from the screen file 5 (for example, screen information configuring an electric power system diagram by combining various symbols) is displayed on the CRT display unit 1, and the pixel address for each symbol constituting the screen information is displayed. The range and cursor display position information is stored in the table 4 in units of blocks and updated each time the screen is modified, symbols are deleted, or added. When the light ben 2 is applied to the display surface of the CRT display and an attempt is made to select the symbol S shown in FIG.
If there is a hit at Y, the hit information X, , Y
, is given to the light vent control section 3. When the control unit 3 receives the hit information X,, Y, it performs a comparative search with the first and last information stored in the table 4, and if the hit information is registered, it displays the cursor of the registered block. The position information x, , y is successively provided as the CRT display section IK cursor display position information, and the C
The RT display unit 1 displays a cursor K at pixel addresses x, y, to notify that the symbol S has been specified by the light ben 2. Therefore, when specifying the position of the symbol S, if hit information is obtained from the light ben within the first and last pixel address range, the cursor can be displayed at an appropriate position, and the pixel address range can be set appropriately large and the stitching (
By adjusting the range according to screen changes), it is possible to specify the position reliably even if the light pen position deviates slightly from the symbol. The table contents are adjusted by the control section 3.

Note that when the hit information of the light ben falls within a range that is not registered in table 4, the control unit 3 erases the cursor on the CRT to notify that the position specification is inappropriate, and then resets the cursor by specifying the proper position again. Give location information.

The display control mode of the control unit 3 is shown in FIG. 5 (4) and (
The flowchart shown in B) is obtained. Figure 4 (4) shows the cursor control flow, in which the light ben receives hit information (step S1), searches table 4 (step S2), and determines whether the hit information is within the pixel address range of a certain symbol. If it is within the range, the cursor position information from the search result is output to the CRT display section (step S4); if it is outside the range, a cursor deletion command is given to the CRT display section (step S5).

CB) in the same figure shows the table update control flow, in which table information is updated from screen 7 isle 6 to table 4 for each symbol that makes up the current display screen in response to changes in the display screen such as screen switching, symbol deletion, and addition. Erase files transferred to
Additional information is updated (step S6).

Note that the contents of table 4 are not limited to the setting of the pixel address range for symbol S as shown in FIG. 4, and can be changed as appropriate depending on the position of the symbol on the screen or the number of symbols. For example, as shown in Figure 6 (A) to (Q), in a case where the symbol is displayed relatively in the center of the screen, it is necessary to avoid giving margin to the left and right sides of the symbol S.
), in order to cope with the decrease in brightness of the CRT and to improve the operability of the symbols located on the left end of both sides, the symbol S is located on the left side of the range (Figure 6B), and the symbol S on the 7th symbol on the right end of the screen is To improve operability, the symbol S is placed to the right of the range (Fig. 6C), and similarly, to improve the operability at the top and bottom of the screen, the symbol S is placed near the top of the range (Fig. 6D). lower part of the range (Figure 6E)
to make position specification more reliable and easier.

As described above, according to the present invention, information specifying the pixel address range for the display position of a character or graphic symbol and cursor display position information are stored in a table, and pixel information based on a hit with a light pen is stored in a table. Since the cursor position 1k is specified and the cursor position 1 is specified by comparing the information with the information in the table, the operability of the light pen in high-density display can be improved regardless of the size of the symbol, and the cursor position relative to the symbol can be The cursor can be placed in an appropriate position (especially on the screen 414), and the cursor and symbol are reliably separated so that the cursor does not disturb the symbol. Furthermore, if a margin is provided for the pixel address range in anticipation of changes in the brightness of the CRT, position designation will not become unstable due to aging or the like.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the screen format of a CRT display device, Figure 2 (N), Figure 2 (B) and Figure 2 (C) are diagrams showing the relationship between pixels, symbols, and cursors, and Figure 6 is a diagram showing the screen format of a CRT display device. FIG. 4 is a diagram illustrating the relationship between pixel address ψα circumference information, symbols, and cursor display position information in the present invention; FIG. 5 +A) and FIG.
Figure (B) is a flowchart of the control section in Figure 6, Figure 6 (B), Figure 6 (C), Figure 6 (0) and Figure 6 (■) are the pixel address ranges in the present invention. FIG. 3 is a diagram for illustrating the relationship between information and symbols. a...pixel, S...symbol, K...cursor,
l...CRT display section, 2...Light pen, 3...
-Control section, 4...Table, 5...Screen file. Figure 3 Figure 6 (C) Figure 6 (T)) To Figure 6 (F,)

Claims (1)

[Claims] Semi-graphic CR that displays symbols of characters and shapes
In the T display device, pixel address range information that specifies the pixel address range in which the symbol is displayed and cursor display position information that specifies the cursor position to be displayed within the range by pixel address are set according to the display position WK of each symbol. , a table that stores the adjusted information blocks, and the light pen hit information is given as a pixel address, and the information block is searched to see if it is within the pixel address range of which information block stored in the above table. A position specifying method using a light ben, comprising: a controller that obtains cursor display position information; and a CRT display section that displays a cursor at a pixel address according to the cursor display position information retrieved by the controller.