【摘要】 地图符号qgf(x)是制图对象x在f,g,q三重拓扑映射下的象[1]。在此基础上,通过分析地图线状符号的特征,提出了半依比例线状符号的数学定义,并给出了对构造矢量线状符号的几何图元进行旋转、变形、裁剪等处理方法的数学基础,且运用面向对象的方法给出了线状符号的实现过程,最终通过实现证明了该方法解决了拐点超出扇形区域的问题且在视觉上达到了很好的效果。更多还原

【Abstract】 There are three topological mappings of f,g,q relation between mapping object x and map symbol qgf(x).On this basis,this paper analyses the characteristic of linear map symbol,gives the mathematical definition of semi-scale linear symbol,and describes the mathematical foundations of meta-data’s rotation,deformation and clipping to construct linear vector symbol.In the end,it is realized through object-oriented programming method and the experiment results show that it works well and has higher drawing quality.更多还原