Drawing method for vector graphic map symbols

A technology for vector graphics and graphic rendering, which is applied in the field of geographic information and can solve the problems of incapable of anti-aliasing and smoothing of graphics.
CN101887592BInactive Publication Date: 2011-11-02CHINESE ACAD OF SURVEYING & MAPPING
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHINESE ACAD OF SURVEYING & MAPPING
Publication Date
2011-11-02
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a computer drawing method for vector map symbols with image smoothing characteristic. In the method, the image display characteristic is analyzed by taking image characteristic of aliasing phenomenon of the vector map symbol on a display device as a start point under the condition that the resolution of the device is not increased; and the vector map symbol is smoothly drawn through sampling and image filtering according to categories of points, lines and planes of the map symbol. The drawing method overcomes the defects of rough display of the conventional vector mapsymbol and large superimposition display contrast with image data and the vector drawing is converted into image processing and output, so that computer fine drawing of all map symbols can be realized and the drawing method has great significance for the field of geographic information visualization.
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Description

technical field

[0001] The present invention belongs to the technical field of geographic information, and more specifically relates to a computer drawing method for multi-grayscale smooth display of vector graphics, in particular to a vector map symbol displayed on a computer using a raster graphics display after multi-grayscale smoothing processing Methods. Background technique

[0002] Map symbols are the basic means to express the content of maps. They are composed of graphics or characters of different shapes, sizes, and colors. They have a clear reference to geographical elements and are important clues for visual perception of maps and important for interpreting maps. The basis is an important content of the visual expression of geographic information. At present, geographic information system (GIS) and various map software mainly use map symbols to complete the symbolic expression of geographic information. Except for a small number of point symbols that use picture...

Claims

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