常见的几何图形（二维图形）都是由点、直线和圆组成，而平面上的点和直线都可用矢量进行表示，如果假设几何图形中不包含圆，那么一个无论多么复杂的几何图形都可用矢量表示并存储，且图形上的几何变换都可通过矢量上的变换得以实现。-A common geometry (two-dimensional graphics) by points, lines and circular form, while the plane of the points and straight lines are available vectors indicated that if the assumed geometry does not contain a round, then one, no matter how complex geometry Vector graphics are available to express and store, and graphics can be passed on the geometric transformation on the vector transformation can be achieved.