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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。 |
求平面方程和直线交点
原坐标系下 三个两两垂直的向量构成新坐标系，求从原坐标系到新坐标系的空间变换矩阵
平面直角坐标系下情形：
坡面法向量在XOZ平面和YOZ平面上的投影线的坡度大小，可能实际用处比较小。
空间直角坐标系中点的平移、旋转、缩放后坐标计算
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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Mapping Irregular Quadrilateral to a Rectangle