分析的精彩
https://blog.csdn.net/u011387817/article/details/89142467
/**
* @param view 目标view
* @param points 坐标点(x, y)
* @return 坐标点是否在view范围内
*/
private boolean pointInView(View view, float[] points) {
// 像ViewGroup那样，先对齐一下Left和Top
points[0] -= view.getLeft();
points[1] -= view.getTop();
// 获取View所对应的矩阵
Matrix matrix = view.getMatrix();
// 如果矩阵有应用过变换
if (!matrix.isIdentity()) {
// 反转矩阵
matrix.invert(matrix);
// 映射坐标点
matrix.mapPoints(points);
}
//判断坐标点是否在view范围内
return points[0] >= 0 && points[1] >= 0 && points[0] < view.getWidth() && points[1] < view.getHeight();
}
