基于多重变换组合的动态地图符号设计
Design of Dynamic Map Symbol Based on Multi-transform Assembly
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摘要: 采用面向对象的设计方法,将符号的状态描述(参量)与过程操作(对不同参量实施不同变换)封装,采用关键帧-层-图元-几何/非几何属性结构进行符号组织,从而将地图符号的时间维信息纳入到符号设计之中,建立了不同的变化速率模型,实现属性的动态变化;通过图元与图元之间的二维Morph函数变换矩阵,结合仿射变换,对符号的几何信息进行快速提取,从而实现了符号的动态显示。Abstract: Multi-transform assembly is brought forward to design dynamic map symbol.The data structure of key frame,layer,graphic element,geometry and attribute are used to organize the dynamic symbol.The models of change rate are built to implement the dynamic change of symbol attributes,and the expandable 2D Morph transform matrix of graphic elements is provided,and the affine transform is united to implement the dynamic extraction and visualization of symbol
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