㈠ 点的基本运算

1. 平面上两点之间距离 1

2. 判断两点是否重合 1

3. 矢量叉乘 1

4. 矢量点乘 2

5. 判断点是否在线段上 2

6. 求一点饶某点旋转后的坐标 2

7. 求矢量夹角 2 -I-point basic computing 1. Planar distance between two points on 1 2. To determine whether the coincidence of two 1 3. Vector fork x 1 4. Vector points x 2 5. To determine whether the line segment points 2 6. For a little Rao After rotating the coordinates of points 2 7. seek vector angle 2