How to find scaled point before scale?
I have a view and animation for that. I scaled up this view on 3X and 3Y .
pivotX and pivotY -> center of View
And i want to find a point(left,top), already scaled values, before i scale the view.
How can i find this point? ->()------------------------
| ______________ |
| | | |
| | 100x50 | |
| | | |
| -------------- |
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Note : coordinate system as [x : from left to right, y : from top to bottom]
你可以计算任何一点后的比例如下：
// 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;
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