JPH04326117A - Graphic display device - Google Patents

Abstract

PURPOSE:To shorten the time required for calculating process and display operation by storing graphic data which are clipped in an invisible area and displaying a graph by using the stored data when a visible area changes. CONSTITUTION:A program 27 sends a display request to a window control program 26. The window control program 26 informs the program 27 of the visible area 25 and invisible area 24. The program 27 sends the data, obtained by clipping graphic data in the visible area 25, to the window control program 26 to display the figure in a window 22 and also stores a memory 29 with the result obtained by clipping the graphic data in the invisible area 24 at the same time. When the invisible area of the window 22 is eliminated, the window control program 26 informs the program 27 of that. The program 27 does not clip only the graphic data stored in the memory 29 and sends them to the window control program 26 to display the figure in the previous invisible area 24.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention is applied to graphic display means. In particular, it relates to graphics processing means on computers with multi-window systems.

0002

2. Description of the Related Art A multi-window system is defined as a plurality of graphic display windows 42 and 4 that are allowed to overlap each other on one display screen 41, as shown in FIG.
3 graphics system. In a multi-window system, a plurality of programs independently display figures in a plurality of figure display windows, but some of the figures that should be displayed in the window may not be displayed due to overlapping windows. For example, as shown in FIG. 4(a), window 43 is
, a part of the display figure in the window 42 is covered by the window 43 and is not displayed. When a figure displayed in a window is covered by another window and cannot be displayed, it is called invisible, and the area where the figure is invisible on the window is called the invisible area of that window The upper area, that is, the area where the figure is displayed, is called the visible area. In FIG. 4, the invisible area of the window 42 is 44, and the visible area is 45. In a multi-window system, Figure 4 (
When the window 43 moves as shown in b), the visible area changes as shown in 46, and a part of the figure that was previously invisible must be displayed. In order to display such figures, the figure display method used in the conventional multi-window system involves a procedure 51 for clipping the displayed figure data in the visible area of the window, as shown in FIG.
, a procedure 52 for displaying the clipped figure data in the visible area, a procedure 53 for recognizing changes in the visible area due to window movement, a procedure 54 for re-clipping the displayed figure data in the changed visible area, and a procedure 54 for re-clipping the displayed figure data in the changed visible area. and a procedure 55 for redisplaying the figure in a new visible area.

0003

[Problem to be Solved by the Invention] In such a conventional example, every time the visible area of a window changes, all the figures to be displayed in the window are clipped in the visible area, so the figures that are caused by the movement of the window are The disadvantage of this method is that it requires unnecessary calculation time to display the information.

SUMMARY OF THE INVENTION An object of the present invention is to provide a graphic display device that eliminates these drawbacks and can reduce the amount of calculation required to display graphics as a window moves.

[0005]

[Means for Solving the Problems] The present invention provides a graphic display device equipped with a display means for displaying a figure in the visible area of each of a plurality of figure display windows that are allowed to overlap each other. A means for clipping figure data in an invisible area of a figure caused by overlapping display windows, a means for saving the figure data clipped by this clipping means in a memory for saving figure data, and a means for changing the overlap of figure display windows. The invention is characterized by comprising a means for displaying a figure in the overlapping change part of the figure display window using the figure data stored in the saving means when the figure is recognized.

[0006]

[Operation] The displayed graphic data is clipped in an invisible area due to window overlap, the clipped graphic data is saved, and the saved graphic data is used to display the graphic in the window.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart of the present invention.

As shown in FIG. 1, this embodiment has a plurality of graphic display windows 22 that are allowed to overlap each other;
23 (32, 33), a window management program 26 (3
6) and graphic display programs 27, 28 (37, 38
), and furthermore, as a feature of the present invention, the display means includes a procedure 11 which is a means for clipping graphic data in an invisible area 24 (34) of a graphic caused by overlapping graphic display windows; a procedure 12 that is a means for storing the graphic data clipped by the clipping means in the graphic data storage memory 29 (39);
Procedures 13 and 14 are provided which are means for displaying a graphic in the overlapping changed part of the graphic display window using the graphic data stored in the storing means when a change in the overlap of the graphic display window is recognized.

Next, the operation of this embodiment will be explained. A graphic to be displayed in a window is clipped in an invisible area of the window in a procedure 11, and then saved as graphic data in a procedure 12. Changes in the visible area due to window movement are recognized in procedure 13, and graphic display in the visible area using the saved graphic data is executed in procedure 14.

FIG. 2 is a block diagram of a first embodiment of the present invention. 21 is a display screen, 22 and 23 are graphic display windows on the display screen, 24 is an invisible area of window 22 caused by the overlap of windows 22 and 23, 25 is a visible area of window 22, and 26 is a graphic display of the entire display screen. 27 and 28 are programs for displaying graphics in windows 22 and 23, respectively, and 29 is a memory for storing graphic data. The program 27 or 28 displays graphics on the display screen using the window management program 2.
6 indirectly. For example, when displaying a figure on the window 22 that overlaps the window 23, the program 27 first displays the window management program 26.
Make a display request to. Upon receiving the request, the window management program 26 notifies the program 27 of the visible area 25 and invisible area 24 of the window 22. Upon receiving the notification, the program 27 sends the data obtained by clipping the graphic data in the visible area 25 to the window management program 26, displays the graphic in the window 22, and at the same time displays the result of clipping the graphic data in the invisible area 24. It is stored in the memory 29. Next, when the window 23 that was overlapping the window 22 moves and the invisible area 24 of the window 22 disappears, the window management program notifies the program 27 to that effect. The program 27 that has received the notification sends only the graphic data stored in the memory 29 to the window management program 26 without clipping it, and displays the graphic in the previously invisible area 24.

FIG. 3 is a block diagram of a second embodiment of the present invention. 31 is a display screen, 32 and 33 are graphic display windows on the display screen, and 34 is a window 32.
35 is a visible area of window 32, 36 is a window management program that controls the graphic display of the entire display screen, 39 is a memory for storing graphic data, 37 and 38 are These are programs that display graphics in windows 32 and 33, respectively. In this example, window 3
When a graphic is to be displayed on the window 32 overlapping under the window 3, the program 37 first sends graphic data to the window management program 36. The window management program 36 clips the received graphic data in the visible area 35 of the window 32 and displays it within the visible area 35, and at the same time stores the result of clipping the graphic data in the invisible area 34 in the memory 39. Next, the window 33 that was overlapping the window 32 moves, and the window 32
When a new visible area 40 occurs, the window management program 36 recognizes the change, takes out the graphic data stored in the memory 39, clips it to the new visible area 40, and displays it in the new visible area 40. In this embodiment, the window management program 36 saves and displays graphic data, and only the graphic data that has been clipped and saved is subject to re-clipping, so the time required for calculation processing and display is reduced. It has the advantage of being shortened.

0012

[Effects of the Invention] As explained above, the present invention saves the graphic data clipped in the invisible area and displays the figure using the saved data when the visible area changes. This has the effect of shortening the time required for display.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of an embodiment of the present invention.

FIG. 2 is a block configuration diagram showing the configuration of a first embodiment of the present invention.

FIG. 3 is a block configuration diagram showing the configuration of a second embodiment of the present invention.

FIG. 4 is a diagram showing an example of a screen of a multi-window system.

FIG. 5 is a flowchart showing the operation of a conventional example.

[Explanation of symbols]

21, 31, 41 Display screen 22, 23, 3
2, 33, 42, 43 Graphic display window 24, 34, 44 Invisible area 25, 35, 40, 45 Visible area

Claims (1)

[Claims] 1. A graphic display device comprising display means for displaying a figure in the visible area of each of a plurality of figure display windows that are allowed to overlap each other, wherein the display means displays a figure generated by overlapping of the figure display windows. means for clipping graphic data in an invisible area of the screen, means for storing graphic data clipped by this clipping means in a memory for storing graphic data, and means for storing the graphic data when a change in the overlapping of graphic display windows is recognized. 1. A graphic display device comprising means for displaying a graphic in an overlapping portion of a graphic display window using graphic data stored in the graphic display window.