JPH07122896B2 - Graphic display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to a graphic display device for efficiently capturing and displaying graphic data input from a graphic input device. A graphic control unit that stores graphic data input from a graphic input device in a graphic memory and a graphic data stored in the graphic memory is transferred to a display memory for the purpose of providing a control method capable of drawing at a high speed. And a display control unit for performing graphic display on the display device, a graphic control timer and a display control timer for operating the graphic control unit and the display control unit at independent control timings, and a control unit for controlling the device. Constitute.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic display device for efficiently capturing and displaying graphic data input from a graphic input device.

A general form of graphic processing is a method of inputting a graphic, an image or the like from a graphic input device such as a tablet or a digitizer, storing the graphic data in a memory and displaying the graphic data on a screen by a display device.

In this case, the graphic data is decomposed into the pixels of the graphic by the graphic input device, is composed of the coordinates of each pixel, and is input to the graphic display device.

Although this graphic data is transferred to the graphic memory and the display memory while being subjected to predetermined processing, it is required to accurately and rapidly perform graphic input.

[Conventional technology]

 FIG. 3 is a diagram for explaining a conventional graphic drawing mechanism, and FIG. 4 is a flow chart for explaining a drawing procedure.

Hereinafter, the operation of each unit in FIGS. 3 and 4 and the procedure of the process will be described with corresponding numbers in parentheses.

As shown in FIG. 3, the control unit 10 is usually composed of a microprocessor and controls the operation of each unit of the drawing mechanism based on a control program.

The control unit 10 activates the graphic input device, for example, the tablet 1 (1), and the tablet 1 notifies the control unit 10.

That is, after waiting for an interrupt (wait) (2), the tablet 1 detects the pixel coordinate data of the figure and interrupts (3).

The coordinate data is set in the graphic control unit 2 by the control unit 10, and is also set in the graphic memory 3 via the graphic control unit 2 (4).

The figure control unit (2), for example, reads previously input coordinates from the figure memory 3 and generates image point coordinates on a straight line connecting the input coordinates, that is, a vector on the figure memory 3. Is generated and the interruption of drawing end is notified (6).

Next, the control unit 10 activates the display control unit 4 (7), and the display control unit 4 takes out the vector data formed in the graphic memory 3 and forms a display image in the display memory 5.

Then, the graphic formed in the display memory 4 is displayed on the screen of the display device 6.

When the display of one screen is completed, the display control unit 4 interrupts the control unit 10 (8) and notifies the control unit 10 of the completion of the display (9).

Next, the tablet 1 is started up, an operation of reading the next coordinate data is performed, and the above procedure is repeated.

[Problems to be solved by the invention]

In this conventional method, for example, when coordinate data is input, a vector is generated between the coordinate and the previously input coordinate, and an attempt is made to input from the graphic input device until the vector is displayed. Is not accepted.

That is, the next input cannot be performed until the display end interrupt is notified.

As a result, necessary pixels may be missing, a missing part may appear in the displayed graphic, or a different graphic may be displayed.

The present invention was created in view of the above circumstances, and an object thereof is to provide a control system capable of drawing a graphic input from a graphic input device at the maximum speed of the drawing mechanism. .

[Means for solving problems]

In order to achieve the above-mentioned object, a graphic display device including a graphic control unit, a display control unit, a graphic control timer for controlling both control units at mutually independent timings, a display control timer, and a control unit of the device is configured. To do.

[Work]

The coordinate data of the image pixels input from the figure input device is the control timing stored in the figure memory via the figure control unit and the control timing stored in the display memory from the figure memory via the display control unit and displayed on the display device. And are controlled at independent timings.

That is, the graphic control unit and the display control unit operate with the graphic timer and the display timer, respectively.

Since the coordinate data of the image pixels, which is the source of the formation of the display screen, is input without waiting for the end of the graphic display, the data is captured with the maximum performance of the graphic control unit.

That is, the input data can be captured as accurately as possible so as to avoid image loss.

On the other hand, the screen display of the display device for displaying the fetched data is sufficient from the human visual point of view even if the cycle is about 30 screens per second.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an embodiment of the graphic display device of the present invention, and FIG. 2 is a flow chart diagram showing the control procedure of the present invention.

The same reference numerals denote the same objects throughout the drawings.

The operation of each unit in FIG. 1 will be described below in association with the procedure of the process shown in parentheses in FIG.

In the figure input device, for example, a tablet 1 for a figure and a keyboard 1A for figure processing are connected.

The figure input device is activated (1), and the same steps (1) to (4) as the control procedure of FIG. 3 described above are performed.

That is, the tablet 1 detects the pixel coordinates of an input graphic (2), is set in the graphic control unit 2, and is set in the graphic memory 3 via the graphic control unit 2 (3).

The figure control unit 2 reads the input coordinates from the figure memory 3, performs a predetermined process, and notifies an interruption of drawing end (4).

Then, the tablet 1 is immediately activated and the above procedure is repeated.

On the other hand, when the display control timer 12 is started in combination with the operation of the graphic control unit 2 and the screen display speed is set to 1/30 seconds, for example,
When this time has elapsed, the display control timer 12 notifies the control unit 10 of interruption.

The display control unit 4 takes out data from the graphic memory 3, forms an image and sets it (5).

The graphic formed in the display memory 5 is displayed on the screen of the display device 6, and the display control unit 4 notifies the control unit 10 of the end of display (6).

Then, the procedure of starting the display control timer 12 is repeated.

In this way, the graphic control unit 2 and the display control unit 4 operate in parallel at their own timing. The printing unit 7 shown in FIG. 1 is composed of a print control unit 71 and a printing device 72, and prints the graphics of the graphics data stored in the graphics memory 3, and the graphics displayed on the screen of the display device. Copy print (hard copy).

Further, the graphic control unit 2 and the graphic control timer 11, and the display control unit 4 and the display control timer 12 generate timings corresponding to their respective timers by a control timer (not shown) that is a control timing reference for the control unit 10. It goes without saying that any control timing may be generated from the control timer and the other timer may be provided independently.

Further, these functions are possible by independently performing the task of controlling the input of the graphic input device of the control program executed by the control unit 10 and the task of displaying on the display device.

〔The invention's effect〕

As described above, according to the present invention, the graphic control unit and the display control unit operate at their own timing, so that the number of samplings of image input data can be increased and an accurate image can be drawn. It is possible and industrially very useful.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a graphic display device of the present invention, FIG. 2 is a flow chart diagram showing a control procedure of the present invention, FIG. 3 is a diagram explaining a conventional graphic drawing mechanism, FIG. 4 is a flow chart for explaining a conventional control procedure. In the figure, 1 is a tablet, 2 is a graphic control unit, 3 is a graphic memory, 4 is a display control unit, 5 is a display memory, 6 is a display device, 10 is a control unit, 11 is a graphic control timer, and 12 is a display control timer. Indicates.

Claims (1)

[Claims] 1. A graphic memory (3) which performs predetermined processing on graphic data of two-dimensional coordinates input from a graphic input device (1).
The graphic control unit (2) for controlling storage in the graphic memory, takes out the graphic data stored in the graphic memory (3), forms an image, and sets it in the display memory (5). In a graphic display device comprising a display control unit (4) for controlling the graphic display and a control unit for controlling the device, a graphic control timer (11) for timing the operation of the graphic control unit (2). And a display control timer (12) for timing the operation of the display control unit (4), wherein the graphic control unit and the display control unit operate simultaneously at their own timing. Graphic display device.