Color filling method in high-level map symbolization processing

Abstract

The invention discloses a color filling method in high-level map symbolization processing, and the high-level map symbolization processing is openlayers high-level map symbolization processing. The method is characterized by comprising the following steps: 1) adopting Pattern to replace an rgb color when setting a filling color of a surface; 2) returning the Pattern in the step 1) by adopting an HTML5 canvas createPattern () method. The color filling method in high-level map symbolization processing is based on an open source WebGIS engine, namely openlays, in combination with a canvas technology of html5, so that high-level map symbolization of a browser end is realized. And dynamic advanced symbolization display of the vector data can be realized. Existing tile map methods can display complex map styles, but tile data are static and cannot be dynamically drawn according to real-time vector data. For vector data needing to be changed, the existing dynamic rendering can only simply setthe filling color of a surface, and the style is single. The method is applied to the WebGIS system, the complex thematic map can be drawn dynamically, and the attractiveness and professionality of the whole map are improved.

Description

technical field [0001] The invention relates to a color filling method in advanced map symbolization processing. Background technique [0002] The existing WebGIS system can only set the filling color of the surface or use the tile service to display complex styles when rendering the surface. The browser requests the png image from the background and displays it on the screen, instead of dynamically drawing the surface. In ordinary online maps When dynamically drawing surfaces, professional symbolization functions cannot be realized. Only the border of the surface, the fill color of the surface, and the transparency of the fill color can be set, and the rendering of surfaces with complex textures cannot be realized. In order to meet the diversity of map rendering and the display requirements for thematic data, an implementation of advanced map symbolization that can realize complex style rendering of maps is very necessary. Contents of the invention [0003] The technical...

AI Technical Summary

Problems solved by technology

[0002] The existing WebGIS system can only set the filling color of the surface or use the tile service to display complex styles when rendering the surface. The browser requests the png image from the background and displays it on the screen, instead of dynamically drawing the surface. In ordinary online maps When dynamically drawing surfaces, professional symbolization functions cannot be realized. Only the border of the surface, the fill color of the surface, and the transparency of the fill color can be set, and the rendering of surfaces with complex textures cannot be realized.

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