JPH0612053A - Display device for computer - Google Patents

Abstract

PURPOSE:To provide the display device for computer which reduces the burden to a host computer by saving the trouble of issuing a plotting command for each picture from the host computer to the display device. CONSTITUTION:A plotting pattern of a portion of one picture, plotting relative coordinates where coordinates of start and end points or the like as references of the plotting pattern are expressed by variables, and the plotting command from a host computer 2 which designates a plotting logic mode for each picture are stored in a first memory means 3. A plotting command control program from the host computer 2 which performs absolute coordinate transformation to substitute variables of plotting relative coordinates with peculiar values and successively updates peculiar values and indicates an end condition or the like of this successive update of peculiar values is stored in a second memory means 4. A display device 1 is provided with a program control means 5 which interprets and executes the plotting command subjected to absolute coordinate transformation based on this program to plot a picture on a display screen 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer display device as an output terminal device of a host computer,
In particular, the present invention relates to a computer display device having a function of saving the burden of issuing a drawing command for each screen from the host computer and reducing the load on the host computer.

[0002]

2. Description of the Related Art Conventionally, in offices or factories, a computer display device such as a CRT display device or a liquid crystal display panel and an input means such as a keyboard or a touch panel are arranged for each section. In a manufacturing line or the like, work instruction contents for instructing the worker about each work contents for each process are displayed. These display devices and input means are connected to one host computer in parallel and are individually controlled, so that each display device can independently display a screen at any time. .

In this computer display device,
As shown in the flow chart of FIG. 5, the drawing command for one screen from the host computer is stored in the memory means,
It interprets this, draws and outputs it to the video RAM, displays it on the screen, and when the drawing command for the next one screen is issued, this is repeated again. For example, on the screen of the display device, a total of 25 concentric squares 11 each having a size of 100 dots vertically and 100 dots vertically shown in FIG. In this case, as shown in FIG. 4, the host computer sequentially issues 25 drawing commands from the outermost quadrangle 11 to the innermost quadrangle 12 to perform drawing.

In the drawing command "BOX", first "03h" means that a rectangle is drawn, "00h" means that "00" is a hexadecimal number, and "SX" means a rectangle drawing pattern. In the drawing, the X coordinate of the starting point which is the reference of drawing, "SY" is the Y coordinate of the starting point, "EX" is the X coordinate of the ending point, "EY" is the Y coordinate of the ending point, and the last "00".
“H” is a drawing logic mode, and represents that “drawing” before this command is “overwritten” without erasing the drawing. That is, the first drawing command is "(00
00h, 0000h) (upper left corner on the display screen) as a starting point, and (0064h, 0064h) (lower right corner on the display screen) as an end point are drawn in the overwriting mode ". Each drawing command consists of 10 bytes, and a total of 250 bytes are required for drawing commands for all 25 screens.

[0005]

However, in the above-mentioned conventional computer display device, in addition to the large number of bytes of the drawing command required for one display,
Since there are a plurality of display devices controlled by the host computer, the number of bytes of drawing commands required to display all the display devices is extremely large. In other words, the host computer that performs various calculations, storage, and control imposes a great burden on the control of the display device, and thus causes a delay in various processing speeds including display control by the host computer, or a solution to this delay. However, in order to perform quick processing, it was inevitable to introduce an expensive host computer with even higher processing speed.

The present invention has been devised in view of the above points, and saves the host computer the trouble of issuing a drawing command for each screen when drawing on the display device, and reduces the load on the host computer. It is an object of the present invention to realize an excellent display device for a computer that can achieve the above.

[0007]

In order to achieve the above-mentioned object, a display device for a computer according to the present invention has a drawing pattern for one screen, a starting point, an ending point, and the like which are the reference for drawing in the drawing pattern. First memory means for storing drawing relative coordinates in which coordinates are expressed using variables and drawing commands from a host computer for specifying drawing logic modes such as drawing continuation, additional writing, erasing, and updating for each screen; Storing a drawing command control program from a host computer for instructing absolute coordinate conversion by replacing a variable of drawing relative coordinates in the drawing command with an eigenvalue, sequential updating of the eigenvalue, and ending conditions of the sequential updating of the eigenvalue 2 memory means and interprets and executes the drawing command whose absolute coordinates are converted by the drawing command control program. It is characterized in that it comprises a program control means for the screen display.

The address of the data memory may be used as a variable of the drawing relative coordinates.

[0009]

A drawing pattern for one screen, a drawing relative coordinate in which coordinates on the screen such as a start point and an end point which are a reference of drawing in the drawing pattern are expressed using variables, and drawing continuation for each screen, additional writing, First memory means for storing a drawing command from the host computer that designates a drawing logic mode such as erasing and updating; absolute coordinate conversion by replacing a variable of drawing relative coordinates in the drawing command with an eigenvalue; Second memory means for storing a drawing command control program from the host computer for instructing the end condition of the sequential update and the sequential update of the eigenvalue, and interpreting and executing the drawing command whose absolute coordinates are converted by the drawing command control program. By providing the program control means for displaying on the screen, the program control means of the display device Using the drawing command control program stored in the second memory means, it becomes possible to interpret and execute the drawing commands stored in the first memory means and issue the drawing commands sequentially. The load on the display device by the host computer can be significantly reduced without sequentially issuing drawing commands to the display device.

[0010]

1 is an explanatory view showing a display device for a computer of the present invention, and FIG. 2 is a flow chart of a drawing command control program used in the present invention.

In the figure, 1 is a display device for a computer of the present invention, 2 is a host computer for controlling the display device 3, 3 is a first memory means for storing drawing commands from the host computer 2, and 4 is a host computer. Two
The second memory means 5 for storing a drawing command control program from C is used for controlling the display device 1 itself.
A program control unit 6 made up of a PU, and a video RAM 6 which is a memory for occasional writing and reading dedicated to image processing for drawing and outputting to the display screen 7.

In the present invention, the drawing command "BOX" issued from the host computer 2 to the display device 1 to perform the display of FIG. 3 is as follows. "D" is a symbol indicating that a data memory is used unlike the conventional drawing command. That is, the address 0100 in the data memory represents the drawing relative coordinates of the start point, and the address 0101 in the data memory represents the drawing relative coordinates of the end point. When the display device 1 of the present invention receives the drawing command, it stores the drawing command in the first memory means 3.

Further, the display device 1 is a host computer 2
When the drawing command control program shown in the flowchart of FIG. 2 issued by the computer is received, it is stored in the second memory means 4.

When a command instructing execution of drawing is issued to the program control means 5, the program control means 5 is first used for the drawing relative coordinates of the drawing command of the present invention, as shown in the flowchart of FIG. "0000 (hexadecimal number)" at address 0100 of the data memory,
Similarly, "0064 (hexadecimal number)" is written in the address 0101.

Next, the program control means 5 uses the drawing commands "SX, S stored in the first memory means 3".
Y, EX, EY ”with respect to the drawing relative coordinates, the two addresses of the data memory (the drawing pattern of this embodiment is a“ quadrangle ”that can be drawn only by determining two points on the diagonal). Therefore, the number of addresses of the data memory used as the drawing relative coordinates may be two), and the drawing command is interpreted by substituting each numerical value written in the drawing, and the result is drawn and output to the video RAM 6, and further, the video RAM 6 Draws one screen on the display screen 7, that is, draws the outermost quadrangle 11 in FIG.

Then, in order to perform the next drawing, the value "0000" written in the address 0100 of the data memory.
"2" is added to "(hexadecimal number)" to obtain "0002 (hexadecimal number)". Similarly, the value "0064 (hexadecimal number)" written in the address 0101 of the data memory is subtracted from "2" to obtain "0062 (hexadecimal number)".

Here, if the value written at address 0100 of the data memory is "0030 (hexadecimal number)" or less, that is, the 25th innermost quadrangle 1
If it is within the absolute coordinate of 2, the drawing command is again interpreted and executed as described above to draw the second screen. At this time, the drawing logical mode in the drawing command is "00 (1
Hexadecimal number) ", that is," overwriting ", so that the drawing data of the quadrangle by all the drawing commands in the present embodiment is held in the video RAM 6, whereby the quadrangle at the innermost circumference is vertically and horizontally A quadrangle that becomes smaller by 2 dots is sequentially added. In this way
When the drawing command is executed 25 times, the graphic as shown in FIG. 3 is displayed.

In the above-described embodiment, the total number of bytes of drawing commands and drawing command control programs issued from the host computer 2 to the display device 1 is 78.
Compared with the 250 bytes required for similar display on conventional display devices, the number of bytes is significantly reduced,
It is obvious that the display device of the present invention reduces the burden on the host computer.

As described above, in the display device 1 of the present invention, the drawing command and the drawing command control program are stored in advance in the first memory means 3 and the second memory means 4 from the host computer 2, respectively. By issuing an appropriate command from the input means (not shown) connected to the display device 1 to the program control means 5 as necessary, the display device 1 itself can be issued without issuing a command from the host computer 2. The desired display is obtained.

Further, the display device 1 of the present invention is not only excellent in continuous display of a fixed drawing pattern and copying of the drawing pattern, but also the first memory means 3 and the second memory means 4 are provided. Have multiple sets of each,
It is also possible to store or download a plurality of drawing commands and a plurality of drawing command control programs from the host computer 2 in advance, respectively, and use these appropriately to combine various displays to perform complicated and precise display. It is possible.

The display device 1 of the present invention is not limited to the above-described embodiment, and is also provided with a system for performing drawing by a drawing command for each screen from the host computer in the conventional display device. Either drawing method may be freely selected by a fixed command. With such a configuration, the display device 1 of the present invention is more convenient.

[0022]

As described above in detail, according to the display device for a computer of the present invention, the drawing pattern for one screen and the coordinates on the screen such as the start point and the end point which are the reference of the drawing in the drawing pattern are changed. First memory means for storing a drawing relative coordinate represented by using a drawing command from a host computer for designating a drawing logical mode such as continuous, additional writing, erasing and updating of drawing for each screen; Second memory means for storing a drawing command control program from a host computer for instructing absolute coordinate conversion by replacing a variable of drawing relative coordinates with an eigenvalue, sequential updating of the eigenvalue, and ending conditions of the sequential updating of the eigenvalue And a command for interpreting and executing the drawing command whose absolute coordinates have been converted by the drawing command control program and displaying it on the screen. With the gram control means, the program control means of the display device uses the drawing command control program stored in the second memory means to interpret and execute the drawing command stored in the first memory means. It becomes possible to issue drawing commands one after another, and save time and labor for issuing a drawing command to the display device one by one from the host computer as in the past, and to significantly reduce the burden on the display device by the host computer. Is something that can be done. As a result, it is possible to prevent the delay of various processes of the host computer caused by the heavy load on the display device, and to perform the quick process without introducing an expensive and high-speed host computer.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a computer display device of the present invention.

FIG. 2 is a flowchart of a drawing command control program used in the computer display device of the present invention.

FIG. 3 is an explanatory diagram showing a display example by a display device for a computer.

FIG. 4 is an explanatory diagram showing drawing commands used in a conventional computer display device.

FIG. 5 is a flowchart showing the operation of a conventional computer display device.

[Explanation of symbols]

 1 Display Device 2 Host Computer 3 First Memory Means 4 First Memory Means 5 Program Control Means 6 Video RAM 7 Display Screen

Claims (2)

[Claims] 1. A drawing pattern for one screen, drawing relative coordinates formed by using variables to represent coordinates on the screen such as a starting point and an ending point as a reference of drawing in the drawing pattern, and drawing continuation for each screen, A first memory means for storing a drawing command from a host computer for designating a drawing logic mode such as additional writing, erasing, updating, and absolute coordinate conversion by replacing a variable of a drawing relative coordinate in the drawing command with an eigenvalue; Second memory means for storing a drawing command control program from the host computer for instructing the sequential update of the eigenvalue and the ending condition of the sequential update of the eigenvalue, and interpreting the drawing command whose absolute coordinates have been converted by the drawing command control program. And a computer display characterized by comprising program control means for executing and displaying on a screen apparatus. 2. A display device for a computer according to claim 1, wherein an address of a data memory is used as a variable of the drawing relative coordinates.