向量图使用二阶贝塞尔曲线拟合
二阶贝塞尔曲线需要三个点
线段 三点共线 平滑曲线 三点不共线
提供n个点,每次取三个点,画图。
对矩形来说,顶点往往会在n个点中出现连续两次。为了绘制折线
图片转换效果原理
- 如果两个图对应的点集数目不同,需要进行插值,统一点集数目
- 使用一个点到点的映射的函数,比如 (1- alpha)* start + alpha * end, alpha 0->1
- alpha从0到1的整个过程,就是图形渐变的过程
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