JPH03225562A - Graphic system - Google Patents

Abstract

PURPOSE:To make it possible to display the optional number of cursors having optional colors, shapes, etc., by storing a command group for displaying a cursor being displayed at present by an echo display control means in an up-to-date echo display command storing means. CONSTITUTION:An input device control means 21 always reads out positional information from a tablet 3, and when the position is changed, sets up the position as an input value and informs the input value to an echo control means 11. When an echo mode is ON, the means 11 informs a command group for displaying the cursor of a specified shape on the position corresponding to the input value as an echo to the echo display control means 22. When an up-to-date echo display command storing area 23 is idle, the means 22 plots a graphic for the echo in a frame buffer by an exclusive OR mode in accordance with the sent echo display command group and displays the graphic on a CRT 5. When the storing area 23 is not idle, exclusive OR display is temporarily executed in accordance with the command group stored in the storing area 23 to cancel the old echo and then a cursor is displayed on a new position in accordance with the new echo display command group.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a graphics system equipped with a graphics processing function by a computer.

[Conventional technology]

In recent years, multi-window systems based on the Talianto server model have been developed, in which a graphics processing system on the server or client side controls an input device such as a tablet, the graphics processing system on the client side obtains the input value, and the cursor is used as an echo of the input value. Graphics systems that control display are known.

Incidentally, conventionally, this type of cursor display control has been performed using a hardware cursor register.

[Problem to be solved by the invention]

In this way, conventional graphics systems use hardware cursor registers, so they are not affected by clearing the screen or drawing figures. It had the disadvantage of being subject to restrictions.

The present invention improves upon these conventional drawbacks, and its purpose is to display only one cursor in one color.

An object of the present invention is to provide a graphics system that is not subject to restrictions such as shape.

[Means to solve the problem]

In the graphics system of the present invention, an echo control means for requesting the server to echo display input values read from an input device in a shape requested by the user is provided in the graphic processing system on the client side. , an echo display control means for performing echo display control in response to a request from an echo control means on the client side, and a latest echo display command storage means for always holding the latest echo display command for echo display.

[Effect]

The input value read from the input device is applied to the echo control means on the client side, and the echo control means requests the server side to echo-display the input value in the form requested by the user. Thereby, in the server, the echo display control means performs echo display control in response to a request from the client side.

At this time, the latest echo display command for echo display is always held in the latest echo display command storage means.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a graphics system according to the present invention. Referring to FIG. 1, the graphics system of this embodiment includes a graphics processing system on the client side and a server 2. As shown in FIG.

In this embodiment, a tablet 3 as an input device and a CRT display 5 are connected to the server 2 via a frame buffer 4, and the server 2 controls the tablet 3 as an input device and inputs input values. An input device control means 21 for reading, and an echo display control means 22 for performing echo display control such as displaying an echo on the CRT display 5.
and a latest echo display command storage area 23 that always holds the latest echo display command for echo display.

In addition, the graphics processing system 1 on the client side obtains the input value read by the input device control means 1 of the server 2, and controls the echo display of the server 2 to echo display the value in the shape requested by the user. The echo control means 11 which requires the means 22 is provided.

Next, the operation of the graphics system having such a configuration will be explained.

The input device control means 21 constantly reads position information from the tablet 3, and when the position changes, notifies the echo control means 11 of the position as an input value. Echo control means 1
1 notifies the echo display control means 22 of the server of a command group for displaying a cursor of a specified shape as an echo at a position corresponding to the input value if the echo display mode is ON. If the latest echo display command storage area 23 is empty, the echo display control means 22 assumes that no echo is currently being displayed, and displays the frame buffer 4 in exclusive OR mode according to the sent echo display command group. Draw a shape for the echo above and mark it as C
It is displayed on the RT display 5. FIG. 2 is a diagram showing an example of a display of figures and a cursor on the CRT display 5. In this display example, a cross-shaped "+" is displayed as the cursor 6. On the other hand, the latest echo display command storage area 2
If 3 is not empty, it means that the cursor is currently displayed, so the old echo is erased by exclusive OR display according to the command group in the latest echo display command storage area 23, and The cursor is displayed at a new position with the newly sent echo display command group, and this command group is stored in the latest echo display command storage area 23.
Store in. Further, the echo display control means 22 is called not only when an echo display command group is sent from the echo control means 11, but also when the server receives a request to clear the window screen. Since the echo being displayed is also cleared by clearing, the latest echo display command storage area 23 is also emptied. Furthermore, the echo display control means 22 is also called when the server receives a request to draw figures or characters for the window.

Note that when the server 2 receives a request to draw a figure or character while the cursor is displayed, it draws the figure or character after erasing the cursor. If is displayed, an incorrect display will result when exclusive OR drawing is performed to erase the cursor later, so first call the echo display control means 22 before drawing a figure, etc., and issue the latest echo display command. According to the contents of the storage area 23, if the cursor is displayed,
After erasing the cursor, draw a shape etc.
After drawing, the echo display control means 22 is called again to display the echo according to the contents of the latest echo display command storage area 23.

In this way, in this embodiment, the echo display control means 22 is provided in the server 2, and the command group for displaying the cursor currently displayed by the echo display control means 22 is held in the latest echo display command storage area 23. By doing so, it is possible to display a cursor of any shape in any color in each window (even a plurality of cursors on the CRT display 5) without depending on the cursor display by a hardware cursor register. In addition, incorrect display can be avoided by clearing the screen in the window or drawing a figure overlapping the cursor position.

In the above example, a tablet left was used as the input device, but a control dial is used instead. A device such as a joystick may also be used. Furthermore, in the above embodiment, the input device is connected to the server 2, but instead, the input device is connected to the graphics processing system 1 on the client side, and the input device is controlled on the client side. (In this case, the input device control means 21 is provided in the graphics processing system 1 on the client side.

〔Effect of the invention〕

As explained above, the present invention provides an echo display control means for controlling echo display in a server, and stores a group of commands for displaying the cursor currently displayed by the echo display control means in the latest echo display command storage means. By doing so, it is possible to display cursors of any number of colors, shapes, etc. without being restricted by hardware.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a graphics system according to the present invention, and FIG. 2 is a diagram showing an example of display of a cursor on a CRT display. In the figure, 1...Graphic processing system, 2...Server, 3...Tablet, 4...Frameba sofa, 5...CRT display, 6...Cursor, 1
DESCRIPTION OF SYMBOLS 1...Echo control means, 21...Input device control means, 22...Echo display control means, 23...Latest echo display command storage area.

Claims (1)

[Claims] An echo control means for requesting the server to echo and display an input value read from the input device in a shape requested by the user is provided in the graphics processing system on the client side. 1. A graphics system comprising: an echo display control means for performing echo display control in response to a request; and a latest echo display command storage means for always holding the latest echo display command for echo display.