我有一个视图和动画。我在3X
和3Y
上扩大了这一观点。
pivotX和pivotY - >观点中心
我想在缩放视图之前找到一个点(左,上),已经缩放的值。
How can i find this point? ->()------------------------
| ______________ |
| | | |
| | 100x50 | |
| | | |
| -------------- |
| |
-------------------------
注意:坐标系为 [x:从左到右,y:从上到下]
答案 0 :(得分:0)
您可以计算出像这样的比例之后的任何点:
// find the position relative to the pivot point
float relativeX = pointBeforeScale.x - pivotPoint.x;
float relativeY = pointBeforeScale.y - pivotPoint.y;
// multiply the relative position by the scale
relativeX *= scale;
relativeY *= scale;
// add the pivot point to the result to get the absolute position.
float pointAfterScaleX = relativeX + pivotPoint.x;
float pointAfterScaleY = relativeY + pivotPoint.y;