JPH09231045A - Scroll method for drawing processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drawing scroll method which has no operational stress by minimizing the processing to expand the vector data into a drawing memory and updating fast this memory in every frame by means of the raster data already expanded into the drawing memory in regard to the scroll processing of a drawing processing system consisting of the vector data. SOLUTION: When scroll is requested by an input device against the initial display state, the rectangular areas overlapping each other before and after the raster data stored in a drawing memory 24 are scrolled are copied. Thus the vector data are edited and expanded in a raster into a blank area of the memory 24. As a result, the expansion of raster data is completed to the entire area of the memory 24 after a single frame is scrolled. Then a drawing is displayed after the scroll of a single frame through the display processing of the memory 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrolling method for drawing processing which realizes high speed and smooth scrolling in a drawing processing system which handles large-scale, highly accurate (complex) drawings.

[0002]

2. Description of the Related Art Conventionally, when scroll processing is performed by a drawing processing system composed of vector data, data of the entire screen area is re-developed every time one frame is scrolled. For example, Japanese Patent Application Laid-Open Nos. 04-365086 and 05-
There are known scroll control devices and window screen crawl devices such as those described in JP-A-134653 and JP-A-06-94467.

[0003]

When the user makes a scroll request in the drawing processing system of the conventional scrolling method as described above, the following problems occur. That is, a time stress occurs between frames due to the data development processing overhead of the entire screen for each scroll (one frame) (non-smooth scrolling process). Further, since the size of the expanded data is affected by whether the drawing data is complicated or simple, the processing time per frame becomes uneven.

The present invention has been made in order to solve each of the problems as described above, and an object of the present invention is to make scroll processing of a drawing processing system composed of vector data fast and smooth. , It is to provide a drawing processing method without operational stress.

[0005]

In order to solve the above object, the present invention is characterized by having the following functions.

Of the already expanded data on the drawing memory, a rectangular area to be displayed is copied even after scrolling (moving one frame), and the newly displayed portion is subjected to drawing expansion (expansion to the drawing memory). . A drawing processing system composed of vector data is generally composed of a plurality of layers having different attributes. The attributes of these layers are divided into information that allows the operator to recognize the display position and additional information that does not. Using the characteristics of this layer, during scrolling, only the layer that allows the operator to recognize the display position is subjected to drawing development (expansion to the drawing memory), and when the end of scrolling is recognized, all layers are displayed again.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. 4 is a workstation,
It is a block diagram showing the composition which actually displays vector data on a display on a personal computer. In FIG.
Reference numeral 20 is a display device, 21 is a keyboard / mouse input device, and 22 is a system device. A hard disk device 23 is connected to the system unit,
Stores vector graphic data. A drawing memory 24 for storing display data on the display device 21.
Is built-in. The graphic processing program 26 uses the window control system 25 to operate the display data in the drawing memory 24.

Next, the structure of vector graphic data will be described. In general, vector graphic data is managed in a form in which displayed data is divided into sections called layers for each attribute. As shown in the details of FIG. 5, the vector graphic data of FIG. 4 is applied to all six layers of the layer road 51, the layer administrative district 52, the layer target 53, the layer general building 54, the layer river / lake 55, and the layer facility structure 56. It is divided, and when the information of each layer is superimposed and displayed, the graphic data as shown in FIG. 4 is obtained. This vector graphic data is transparently raster-expanded on the drawing memory 24 using the graphic processing program 26 and the window control system 25, and the contents are displayed on the display device 20.

Next, the scroll processing of the present invention will be described with reference to FIGS. FIGS. 1 to 3 are obtained by dividing a vertically long drawing into three parts. FIG. 1 is the upper portion of the vertically long drawing, FIG. 2 is the middle portion, and FIG. 3 is the lower portion.

In the initial state, the hard disk device 2
Of the vector graphic data 01 stored in No. 3, it is partially stored in the drawing memory 24. (This stored data is called "raster data"). The raster data on the drawing memory 24 is indicated by 02 in FIG. The contents 02 of this raster data are displayed on the display device 2 as 09.
Displayed as 0.

When a scroll request is made in the upper right direction from the input device for the display format in this initial state, as shown in FIG.
The area 03 excluding the range of x1 pixels from the left end, which is the movement amount of the frame, and the range from the lower end to y1 is copied into a rectangular area based on the lower left end on the drawing memory, and the state of 04 is obtained. As a result, since the upper part and the right part of the drawing memory become blank, the vector data is edited as shown in FIG.
The 08 data is rasterized into the 05 and 06 areas on the drawing memory. This completes rasterization of raster data after scrolling one frame in the entire drawing memory area. At this point, by clearing the content 09 that had been displayed on the display device until then and displaying the drawing memory,
The drawing 10 after one frame scroll is displayed.

In this way, by copying the overlapping rectangular area before and after the scroll of the raster data on the drawing memory and performing the scroll processing, the entire drawing memory is expanded from the vector data and scroll processing is performed for each frame scroll. Can achieve high-performance scroll processing.

FIG. 6 is a flow chart of scroll processing in the graphic processing system. This flow includes the processing method 61 which is the method of the present invention, and shows the flow of processing in the drawing processing system.

[0014]

As described above, the scroll method of the present invention has the following advantages.

1. The amount of vector data expansion processing can be minimized and the raster data update processing on the drawing memory can be simplified. Therefore, scroll performance is improved and smooth scrolling can be realized.

2. The data operation (copying of the rectangular area) on the drawing memory is performed by the drawing processor, so that the CPU load can be reduced.

[Brief description of drawings]

FIG. 1 is a scrolling process flowchart of the present invention (No. 1).

FIG. 2 is a scroll processing flowchart of the present invention (No. 2).

FIG. 3 is a scroll processing flowchart of the present invention (No. 3).

FIG. 4 is a block diagram showing a configuration for actually displaying vector data on a display on a workstation or a personal computer.

FIG. 5 is a diagram showing a layer structure of vector graphic data.

FIG. 6 is a flowchart of scroll processing in the graphic processing system of the present invention.

[Explanation of symbols]

 01 Vector graphic data 02 Raster data 09 Display contents on display device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Haraguchi 12 890 Kashimada, Sachi-ku, Kawasaki-shi, Kanagawa Hitachi, Ltd. Information Systems Division (72) Inventor Hajime Fukada 6-chome, Onoue-cho, Naka-ku, Yokohama Address 81 Hitachi Software Engineering Stock Association In-house

Claims (1)

[Claims] 1. A scrolling method for a screen displayed in a drawing processing system, wherein, when a scroll request is made from an input device in the initial display state of the screen, rectangular areas overlapping before and after scrolling of raster data on a drawing memory. Is copied, and by this, the vector data is edited for the blank area in the drawing memory and raster-developed into the above-mentioned blank area. A scrolling method for drawing processing, wherein a drawing after one frame scroll is displayed by displaying the drawing memory.