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常用计算几何算法
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| 整理一下工作学习中用到的计算几何算法，大多使用JavaScript实现。 |
求经纬坐标系上某点沿经线、纬线方向前进单位距离所导致的经纬度变化量：
平面直角坐标系上点向左向右旋转90度以及以y=x的对称点：
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空间直角坐标系中点的平移、旋转、缩放后坐标计算