Behaviour:
In the mouseReleased() method pmouseX = mouseX and pmouseY = mouseY.

Expected:
pmouseX and pmouseY to be the previous x and y positions of the mouse respectively.

I have to work around this by making my own variables prevMouseX and prevMouseY and
setting them in the mouseDragged() method. I then refer to them in the mouseReleased()
method.

hm, so this requires keeping track of the previous mouseX and mouseY, once
removed. the 'previous' value is updated each time mousePressed() has
finished, so when you come to any new mouse event, the previous is exactly
that, the last mouse location.

it appears that in cases of events that aren't mouseDrag and mouseMove, i
need to wait to update that pmouseX/Y. messy, but probably better for most
users.

thread from the board:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Syntax;action=display;num=1129419847

altered mouse behavior for 0116 so that mouse positions update only on
mouseMoved and mouseDragged. this also fixes a macosx bug that cause
mouseX/Y values to be bizarre because mouseExit() fired weird positions.