JPS61196288A - Cursor position coordinate conversion system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is equipped with an input device such as a digitizer or a mouse for inputting the coordinates of a point specified by a person on a screen, and moves a cursor according to the coordinates of the input point. This paper relates to improvements in cursor position coordinate conversion methods for display systems.

When displaying horizontal and vertical line segments on the display section of the above display system, a person specifies the coordinates of the first and last points of the line while looking at the display section, and displays the line segment. However, in this case, it is desirable that it be straight and not difficult to see.

[Conventional technology]

FIG. 6 is a block diagram showing the configuration of main parts of a conventional display system, and FIG. 7 is a diagram showing a horizontal line displayed on the display section in the display system of FIG. 6.

In the figure, 1 is a digitizer, 2 is an input control section, 3 is an image control section, and 4 is a display section.

In FIG. 6, when a signal indicating coordinates is input from the digitizer 1, the input control section 2 converts the input into data, sends it to the image control section 3, and a cursor is displayed at the corresponding coordinate position on the display section 4.

For example, if you want to display a horizontal line between the four points A in Figure 7 on the screen of the display unit 4, while looking at the screen, specify the cursor on the screen of the digitizer 1 so that it is at point A. Next, while looking at the screen of the display unit 4, specify the four points on the screen of the digitizer 1 and issue an instruction to connect the four points, and a horizontal line segment will be displayed.

[Problem that the invention seeks to solve]

However, since the dot spacing of the vertical and horizontal lines is very narrow, it is difficult to specify exactly four points; for example, point C, which is several dots away from point 0, is often specified.

In this case, there is a problem that the horizontal line segment has steps as shown in FIG. 7, making it difficult to see.

The same problem occurs when displaying vertical line segments.

[Means for solving problems]

The above problem is solved by the cursor position coordinate conversion method of the present invention, which fixes the lower bits of input position coordinate data.

[Effect]

According to the present invention, the coordinate data on the display unit that displays the cursor is coarser than the input coordinate data by the fixed lower bit, and the cursor moves on the coarser coordinates, so that, for example, When finding the next coordinate position to display a horizontal line segment, it becomes easier to find the horizontal coordinate position where the first coordinate point is located, so it is possible to display a horizontal line segment that is easy to see without steps.

The same is true for vertical line segments.

〔Example〕

FIG. 1 is a block diagram showing the configuration of the main parts of a display system according to an embodiment of the present invention, FIG. 2, FIG. 3 is a diagram showing details of the data conversion unit 5 in FIG. 1, and FIG. FIG. 5 is a diagram showing coordinate positions every 4 bits based on an arbitrary position.

In the figure, 5 and 20 are data conversion units, 6 and 7 are shift registers, 8 is a control unit, 9 is a buffer memory, 10 is a lower fixed AND circuit, 11 is an upper AND circuit, 12 is an adder, and S-
0 to 5W-1 indicate changeover switches.

The difference between FIG. 1 and FIG. 6 is that a data converter 5 is provided for fixing the lower bits of the position coordinates to which the cursor is moved.

Regarding the details of this data conversion unit 5, the coordinate data X×Y is
The following explanation will be made assuming bits x 8 bits.

FIG. 2 shows a representative method of fixing lower data of only the X coordinate, in which the data of the X coordinate is inputted to the shift register 6, and then transferred from the shift register 7 via the changeover switches 5II4° to S%17. It outputs data, and each changeover switch is provided for each bit, so that when the changeover switch of a certain bit is switched to the ground side, all the changeover switches of the bits below it can be changed.

For example, if you want to thin out every 4 bits based on the origin (0, 0) as shown in FIG. 4, select switch sh. When , sW, is set to the ground side (the same goes for the Y side), the lower two bits are fixed to 0, so the output data will only take multiples of 4, such as 0 and 4.8. On the display unit 4, the cursor is displayed so as to move on the intersection points of grids spaced apart by 4 dots, as shown by the O marks in Fig. 4. It becomes easy to specify the cursor position in horizontal or vertical position.

Next, as shown in Figure 5, the first specified cursor position (
3.0) in FIG. 5 as a reference, and a case where, for example, decimation is to be performed every 4 bits will be explained with reference to FIG.

Note that the method for both the X and Y coordinates is the same, so here 8
The case of the X coordinate of a bit will be explained.

Coordinate data indicating the first cursor position input to the input control section 2-1 is sent to the buffer memory 9 and stored therein, and this data is sent to the lower fixed AND circuit 10.

The lower fixed AND circuit 10 performs an AND operation with the data 00000011, and sends the result to the adder 12. In the case of FIG. 5, a value of 3 is input to the adder 12.

From then on, the coordinate data indicating the cursor position input to the input control unit 2-1 is sent to the upper AND circuit 11,
The data is ANDed with the data of 11100, sent to the adder 12, added to the previously input value of 3, and output to the image control section 3.

In this way, coordinate data for every four dots is created as shown by mark Q in FIG.

If you instruct the control unit 8 how many lower bits to fix,
The above control is performed by the control section 8.

As explained above, by providing the data converter 5,
Since the coordinate data indicating the cursor position can be made coarsely, it is easy to move the cursor to a desired coordinate position when displaying a horizontal or vertical line segment, and a straight and easily visible line segment can be displayed.

When a figure created in this way is printed out, it is natural that the horizontal and vertical line segments are straighter and easier to see than in the past.

〔Effect of the invention〕

As explained in detail above, according to the present invention, when displaying a horizontal or vertical line segment on the display section, it becomes easier to move the cursor to a desired coordinate position, so that a straight and easy-to-see line segment can be displayed. There is a certain effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the main parts of a display system according to an embodiment of the present invention, FIG. 2, FIG. 3 is a diagram showing details of the data conversion unit 5 in FIG. 1, and FIG. Figure 5 is a diagram showing the coordinate positions of every 4 bits based on an arbitrary position. Figure 6 is a block diagram showing the configuration of the main parts of a conventional display system. 7 is a diagram showing a horizontal line displayed on the display unit in the display system of FIG. 6. In the figure, l is a digitizer, 2.2-1 is an input control section, 3 is an image control section, 4 is a display section, 5.20 is a data conversion section, 6.7 is a shift register, 8 is a control section, 9 is a 10 is a buffer memory, 10 is a lower fixed AND circuit, 11 is an upper AND circuit, and 12 is an adder. y61 Figure 2 Figure 3 Figure □ × Figure 5 Figure 7

Claims (1)

[Claims] In a display system that is equipped with an input device for inputting the coordinates of a point specified by a person on the screen and moves a cursor according to the coordinates of the input point, the lower bits of the input position coordinate data are fixed. Cursor position coordinate conversion method.