JPH01119863A - Multipicture display method - Google Patents

Abstract

PURPOSE:To instantaneously switch a general drawing, a partial drawing, etc. and to output a superposed display in a full size by providing plural video memories for storing bit data corresponding to one-to-one to a CRT picture and outputting selectively one or two arbitrary layers. CONSTITUTION:In video memories 1-3, bit pattern data of every layer of a general drawing, a partial drawing, a silk drawing, etc. corresponding to one-to-one to a picture element of a CRT are stored. An output layer switching circuit 4 analyzes an output layer designated signal and converts it to a specific code. A single output use buffer circuit 5 and a superposed output buffer circuit 6 are constituted of plural buffers which are brought to buffering at every signal. A gate circuit 7 receives code signals inputted through the buffer circuits 5, 6 and outputs of the video memories 1-3, and sends out construction data of the video memory to a CRT controller in accordance with the output layer designating signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method of displaying a screen on a graphic terminal in a so-called CAD system, which is a drawing device that performs drawing with the aid of a computer.

[Conventional technology] One of the CAD systems is a printed circuit board design device.

In this printed circuit board design apparatus, there are cases where a different drawing screen is displayed on a graphic terminal for reference during drawing work. In such cases, conventional devices employ the following display method.

■As shown in FIG. 3, the entire diagram (reference image) is displayed in a part of the partial pattern diagram (image being worked on) on the multi-window graphic screen.

(2) Retrieve the overall diagram and partial pattern diagram from the magnetic disk of the CAD system and output it to the graphic screen as necessary.

■CRT on graphic terminal The gold film displays the partial pattern diagram and the overall diagram individually on each CRT.

[Problems to be solved by the invention] However, the above method (■) has the drawback that the overall image is small and difficult to see, and the method (■) requires disk access, which slows down the response and reduces work efficiency. There is a drawback that it does.

In addition, method ■ requires a larger hardware configuration,
It has the disadvantage of being expensive.

The present invention solves these drawbacks by instantly switching between different figures such as an overall figure and a partial pattern figure, and displaying a figure alone or by superimposing two figures in full size on a CRT. The purpose of the present invention is to provide a multi-screen display method that can display images on multiple screens.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for storing a plurality of video data that can fill the full size of a display screen and store bit data in one-to-one correspondence. - Stores the drawing data of each layer in memory, analyzes the output layer designation signal given from the keyboard to generate a decoded signal, and based on this decoded signal outputs the video/video data of the output layer.
Assuming that only the plotting data output of the memory can be passed through, the contents of any one or two video memories can be transferred to C.
It is characterized in that it can be sent to the RT controller and displayed alone or superimposed on the CRT screen.

[Example code] The present invention will be described in detail below with reference to the drawings.

First, the method of the present invention will be explained. The present invention
This is a display method when drawing data stored in a memory is given to a CRT controller and the drawing is displayed on a CRT. In the present invention, the graphics of the CAD system
A display screen video memory is used that can store bit data in one-to-one correspondence with the terminal display screen (CRT screen). Furthermore, a plurality of video memories are prepared, and each video memory stores drawing data for each layer.

The contents of the plurality of video memories are sent to the CRT controller via gate circuits. This gate circuit can pass the output of any one of the plurality of video memories or any two of the video memories.

Such selection in the gating circuit is controlled by the output layer switching circuit. The output layer switching circuit analyzes an output layer designation signal given from a keyboard provided in the graphic terminal and outputs a signal for controlling the gate circuit.

Therefore, if the drawing data of each layer is stored in advance in a plurality of video memories, and the output of one or two arbitrary layers is specified from the keyboard, the output layer switching circuit causes the specified signal (
command) is interpreted, converted into a signal that controls the gate circuit, and provided to the gate circuit.

The gate circuit allows the output of the designated layer (video memory) to pass through based on this signal.

As a result, the contents of the video memory that can be passed through can be sequentially read out and sent to the CRT controller to be displayed on the CRT.

Note that if it is possible to pass plotting data in two video memories, the contents of the two video memories are sequentially input to the CRT controller, and two images are displayed on one CRT screen.
Two drawings can be displayed superimposed.

Furthermore, the video memory covers the full size of the CRT screen, and the superimposed display is also the full size of the screen.

FIG. 1 is a block diagram showing an embodiment of an apparatus for carrying out the method of the present invention. In the figure, 1, 2.
3 are video memories, and each video memory stores bit pattern data corresponding to a pair of pixels on a CRT screen.

For example, video memory 1 stores an overall diagram, video memory 2 stores a partial pattern diagram, video memory 3 stores silk diagrams, and so on, so that drawing data for each layer is stored.

4 is an output layer switching circuit, which is composed of a decoder circuit, and which inputs command input data (graphic C of the layer) given from a terminal keyboard (not shown).
It analyzes the output layer designation signal (for converting the output to RT into 0N10FF) and converts it into a specific code.

Reference numeral 5 denotes a single output buffer circuit that buffers a single output signal, and 6 a superimposed output buffer circuit that buffers a superimposed output signal. These buffer circuits are composed of a plurality of buffers that buffer each signal.

7 is a gate circuit which receives the code signal input via the buffer circuits 5 and 6 and the output of the video memory 1.2.3, and outputs the plotting data of the video memory in accordance with the output layer designation signal. It passes through. This output (image data) is given to a CRT controller (not shown) and displayed on the CRT.

In such a configuration, the output layer switching circuit 4 outputs one of the patterns Y1 to Y6 in response to a control signal input from the keyboard according to the pattern shown in FIG. Yl to Y3 are signals for individually outputting the overall diagram, partial pattern diagram, and silk diagram to the CRT controller, and Y4 to Y6 are signals for superimposing any two of the three video memories to the CRT controller. This is a signal for output.

For example, if a of the command data is 1, b and C are both O (in the case of a command that outputs only the layer of the overall diagram), the output Y1 of the output layer switching circuit 4 is O, Y
2 to Y6 are all 1, and only the output data of the video memory 1 can pass through the gate circuit 7.
Sent to CRT controller.

In addition, when a and b of the command input data are 1 and C is O (in the case of a command that outputs layers of the overall diagram and partial pattern diagram), the output layer switching circuit 4 outputs Y
4 becomes 0, Y2 to Y6 all become 1, the output data of video memories 1 and 2 can pass through gate circuit 7, and is sent to the CRT controller.

In this way, the single output of any one of the three video memories or the superimposed output (override screen) of any two of the three video memories can be easily specified.

Furthermore, each video memory is used as a dedicated memory for each layer, so there is no need to write data each time the display is switched, and output can be switched at high speed by keyboard operation.

Note that although the example shows a case where there are three layers, the number of layers is not limited to this, and it is possible to increase the number of layers as appropriate.

[Effects of the Invention] As described above in detail, the present invention has multiple layers of video memory, and each video memory is used as a dedicated memory for each drawing such as an overall drawing, a partial pattern drawing, and a silk drawing. It is possible to display only one arbitrary layer or to display and output two arbitrary layers in a superimposed manner.

Furthermore, high-speed switching is possible because memory is accessed within the same terminal, and the display size of each screen is the full size of the terminal screen, which has the advantage that the displayed images are easy to see.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of a device for carrying out the method of the present invention, Fig. 2 is a diagram showing an example of an input/output cover pattern of an output layer switching circuit, and Fig. 3 is an example of a conventional display screen. It is a diagram. 1.2.3... Video memory, 4... Output layer switching circuit, 5, 6... Buffer circuit, 7... Goo 1~ circuit.

Claims (1)

[Claims] The drawing data of each layer is stored in a plurality of video memories capable of storing bit data in one-to-one correspondence over the full size of the display screen, and the output layer is given from the keyboard. Analyzes the specified signal to generate a decoded signal, and based on this decoded signal, outputs the video signal of the corresponding output layer.
Assuming that only the plotting data output of the memory can be passed through, the contents of any one or two video memories can be transferred to C.
A multi-screen display method characterized in that the data is sent to an RT controller and can be displayed alone or superimposed on a CRT screen.