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Road shadow drawing method and device

A shadow drawing and road technology, applied in image data processing, instrumentation, 2D image generation, etc., can solve problems such as color blocks, and achieve the effect of avoiding color block problems

Active Publication Date: 2014-07-02
ALIBABA (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a method and device for drawing road shadows, which can solve the problem of color blocks at the intersection of road shadows due to repeated fusion of road shadows

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  • Road shadow drawing method and device

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Embodiment Construction

[0019] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] See figure 1 , is a method for drawing road shadows provided by an embodiment of the present invention, the method comprising:

[0021] Step 10: Create a new road shadow drawing buffer;

[0022] Wherein, the size of the road shadow drawing buffer is the same as the size of the map image to be displayed on the user terminal screen. For example, if a map image of 256 pixels*256 pixels is to be displayed on the screen of the user terminal, the size of the road shadow drawing buffer is also 256 pixels*256 pixels.

[0023] Step 11: call the line drawing interface to draw opaque road shadows for all roads to be displayed in the buffer according to the preset road shadow color;

[0024] Where...

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Abstract

The embodiment of the invention provides a road shadow drawing method and device. The method comprises the steps that a road shadow drawing buffering area is newly built; a line drawing interface is used for drawing non-transparent road shadows for all roads to be displayed in the buffering area according to preset road shadow colors; the road shadows in the buffering area and a base map are fused. By means of the road shadow drawing method and device, the problem that in the prior art, color lumps appear due to the fact that road shadows are fused multiple times at the road shadow intersecting positions can be avoided.

Description

technical field [0001] The invention relates to the field of electronic maps, in particular to a method and device for drawing road shadows in electronic maps. Background technique [0002] In the field of electronic maps, the same principle and method are used to draw road shadows and road lines, that is, to call a line drawing interface (such as DrawPolyline) for each road shadow drawn, and then combine the road shadow drawn by the line drawing interface with The map basemap is fused, that is, the road shadow is drawn on the corresponding position of the map basemap. [0003] During the research and practice of the existing road shadow drawing technology, the inventor found that the road shadow drawn by calling the line drawing interface in the existing technology has a translucent characteristic. When the map base map that has already drawn the road shadow needs to draw a new road shadow When , the existing technology is to fuse the newly drawn road shadows with the map ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
Inventor 林燕腾
Owner ALIBABA (CHINA) CO LTD