JPH01234890A - Graphic display system in multi-view - Google Patents

Abstract

PURPOSE:To plat graphic forms flexibly by providing information on a coordinate space for displaying graphic data one by one so that the figures can be plotted by any of logical space coordinates for defining the forms, normalized coordinate space coordinates for defining a display screen, and the device coordinate space of the display screen. CONSTITUTION:Three elevations of graphic data 16 are displayed on the display screen 11 in different areas (view); and a view 13 is the front elevation, a view 12 is the side elevation, and a view 14 is the top elevation. A normalized coordinate system figure 15 covering both the views 12 and 13 is displayed as a message graphic form which explains the graphic forms of the views 12 and 13. The forms can be defined not only in the logical coordinate space for defining the form like the normalized coordinate system graphic form 15, but also in the normalized coordinate space for defining the views themselves and even when the graphic forms are plotted partially in the different views, the graphic forms in the views are prevented from being hidden and not seen. Consequently, a flexible graphic display is made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for displaying graphical data on a multi-view screen, and particularly to a graphical displaying method suitable for a graphical data display device such as a CAD terminal.

[Conventional technology]

In the conventional method, as described in Japanese Patent Application Laid-Open No. 60-55473, a plurality of display areas are provided and one figure is edited within the area. However, there is nothing that can freely draw complicated figures in two or more different views, and when displaying a figure that spans each display area, a new display area must be created, and the new display area allows the lower There were problems such as the displayed area being hidden.

[Problem to be solved by the invention]

The above conventional technology takes into consideration the case where, when a figure is displayed in multiple display areas, the figure is only displayed in a certain number of display areas, and a complicated figure is drawn in two or more different display areas. Even when drawing a figure that is complicated in two or more display areas, a new display area must be defined, and this new display area will overlap the old display area, and the old display area will be overlaid. There was a problem in that the figures in the area were hidden, making them difficult to see.

An object of the present invention is to enable a figure to be drawn flexibly without defining a new display area even when a complex figure is drawn in two or more different display areas.

[Means to solve the problem]

The above purpose is to make it possible to draw each figure in the logical space coordinates that define the figure, the normalized coordinate space coordinates that define the display screen, and the device coordinate space of the display screen. This is achieved by having coordinate space information displayed for each data item.

[Effect]

According to the present invention, each figure can be drawn in any coordinate space by providing the figure data with information on the coordinate space to be drawn. With this, when a figure is displayed in multiple different display areas (views), another figure can be drawn directly on the coordinate space where the view is defined, so the figure can be drawn across different views. Even if you draw a , the shape on the view will not be hidden from view.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIG.

FIG. 1 shows an overview of the present invention.

On the display screen 11, three orthographic views of the graphic data 16 are displayed in different display areas (views). View 13 is
The front view, view 12 is a side view, and view 14 is a top view. Furthermore, the normalized coordinate system figure 15 spans both the view 12 and the view 13.
It is displayed as a message figure that explains the figure.

FIG. 2 shows an example of displaying a message figure using the conventional method. Similar to FIG. 1, a three-sided view 22. is displayed on the display screen 21. View 23° and View 24 are displayed. Here, if a message figure explaining the figures of view 22 and picture 23 is displayed, a new view 25 must be provided for displaying the message figure.

In this case, view 25 is different from view 22 . This may overlap with the areas of views 23 and 24, and a portion of the three-view diagram, which is a lower view, may be hidden.

In the present invention, as shown in the normalized coordinate system figure 15 in FIG.
It is possible to define shapes not only in the logical coordinate space that defines the shape, but also in the normalized coordinate space that defines the view itself, which solves the above problem and allows users to provide flexible shape drawing definitions. .

FIG. 3 shows a configuration example of the present invention. In the figure, 31 is a CPU;
32 is the main memory, 33 is the keyboard.

34 is a mouse, 35 is a graphics processor, 36 is a frame memory, 37 is a segment buffer, 38 is a C
RT, 39 is a disk device.

A view management table shown in FIG. 4 is prepared on the main memory 32. The view management table is shown in FIG. Position information of the window frame 53 on the logical coordinate space 51 and the viewport frame 54 on the normalized coordinate space 52 is provided for each of a plurality of views.

These positional information can be specified using the keyboard 33. Furthermore, the main memory 32 holds the coordinate transformation matrix table shown in FIG. 7, which includes a window viewport transformation matrix from the window frame 53 to the viewport frame 54, and a workstation transformation matrix from normalized coordinates to device coordinates. , matrices such as real coordinate conversion from logical coordinates to device coordinates are stored.

The disk device 39 stores graphic data shown in FIG. The figure data is - for each figure unit (segment),
its identifier and the number 2 display coordinate system of the displayed view,
Consists of primitive data.

FIG. 8 shows a coordinate transformation system necessary to realize the present invention. 80 is a logical coordinate system (WC space) that defines one figure
, 83 is a normalized coordinate system (NDC space), 89 is CR
This is the device coordinate system (DC space) on T38. WC space 8
0 is clipped with window frames 81 and 82, and viewport frames 84 and 8 on NDC space 83 are clipped.
5. Apply window viewport conversion. Furthermore, N.D.
By performing a workstation transformation from C space to DC space, multiple views 87.
88 can be displayed on the screen. At this time, the normalized coordinate system figure 86 is as follows in the figure data of FIG.
The display coordinate system is NDC space. in this case,
The normalized coordinate system figure 86 can be defined on the NDC space at the same level as the viewport frames 84 and 85 by applying only the workstation transformation of the transformation matrix table in FIG. , it is possible to display shapes that span different views.

The present invention can be realized using the above data and principles, and will be explained below according to the processing flow shown in FIG. 9.

1) 91: Input the window frame position and size of the WC space 80 and the viewport frame position and size of the NDC space 83 from the keyboard 33, and set them at the designated view position in the view management table.

2) 92: Read graphic data from the disk device 39.

3) 93: If the graphic data is WC space 80 definition, go to process 94; if it is NDC space 83 definition, jump to process 95.

4) 94: Find the target view in the view management table from the display view number of the graphic data, and open the window frame 82.
．． A conversion matrix is obtained from the information on the viewport frame 85, and a matrix for performing window and viewport conversion is set on the segment buffer 37.

5) 95: Find a matrix to perform workstation conversion from the conversion matrix table and set it on the segment buffer 37.

6) 96: Set graphic data on segment buffer 37.

7) 97: The graphics processor 35 executes and interprets the graphics command set on the segment buffer 37 and displays it on the CRT 38.

〔Effect of the invention〕

According to the present invention, each figure can be drawn on an arbitrary coordinate space, so in a system that can define a plurality of different display areas, it is also possible to draw complicated figures in two or more different display areas. This has the effect of allowing flexible graphic display.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an overview of the present invention, Fig. 2 is a diagram showing a conventional processing method, Fig. 3 is a system configuration diagram of one embodiment, and Fig. 4 is a diagram showing an outline of the present invention.
The figure is an explanatory diagram of a view management table, and FIG. 5 is an explanatory diagram of window/viewport conversion. Fig. 6 is an explanatory diagram showing the format of graphic data, Fig. 7 is an explanatory diagram of the conversion matrix table, Fig. 8 is an explanatory diagram of the coordinate transformation system used in the present invention, and Fig. 9 is a diagram showing the processing flow. It is. 11... Display screen, 12... View, 15... Normalized coordinate system figure, 80... WC space, 83... ND
C space. 89...DC space.

Claims (1)

[Claims] 1. In a multi-view figure display method in which multiple display areas are provided on the display screen and figures are displayed in the display areas, coordinate system information for drawing is retained for each figure unit of each figure data. A graphic display method in multi-view, characterized in that the graphic data is drawn in an arbitrary coordinate space for each graphic unit.