Ease.java 文件源码

private void init(float startX, float startY, float endX, float endY) {
    PointF start = new PointF(startX, startY);
    PointF end = new PointF(endX, endY);
    c.x = 3 * start.x;
    b.x = 3 * (end.x - start.x) - c.x;
    a.x = 1 - c.x - b.x;
    c.y = 3 * start.y;
    b.y = 3 * (end.y - start.y) - c.y;
    a.y = 1 - c.y - b.y;
}