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Algorithm: Detect a collision

Last Modified: 2019-07-22
I have on my program several rectangles. The rectangles are moveable.  But Collisions should be avoided when moving.
For example:
When I move the blue rectangle on the red rectangle then a collision happened.
The blue rectangle should then be placed under the red rectangle.
But then a collision with the green rectangle happens.
So rectangle blue should be placed between rectangle green and red.
I draw a rectangle after mouseUp Event.

How can I solve this problem?  

After moving
Before movingThank you
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