pin

This is an intermediate step while converting from window to world coordinates. I use the word pin, because I imagine having two pieces of paper. One is marked out in world coordinate, and the other in window coordinates. I then put a pin through both pieces of paper. The pin is at StageView.worldPin and through StageView.viewPinRatio on the other piece of paper. They are now joined at a single point, but still free to rotate. If you change one piece of paper for rubber, you can also imagine scaling too.

StageView and ActView convert between window and pin coordinates using StageOrActView.sceneToIntermediate and StageOrActView.intermediateToScene matrices. They convert between pin and world using StageOrActView.intermediateToWorld and StageOrActView.worldToIntermediate matrices.