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My latest game is a trig minefield. I am living in a world of Maths and pain!
I spent all day trying to rotate rectangle points around an origin to allow for mouse-rollover functionality of objects in a bitmapdata game. I have a central circular object with objects sat on the surface, the entire thing is rotatable - therein lies the co-ordinate nightmare. Sadly I don't have the luxury of using movieclips and rollovers - I really need the extra performance boost from Bitmapdata.
Anywho, after wrestling with rotating rectangles around an origin all morning I came to a far simpler solution. Rotate a single point for each object(in this instance half-width(x), height(y)), then loop through an array of all the objects and find which object's point is nearest the mouse. Taddah! insta-mouse-over.
Like most things: simple. head-ache-inducingly-day-consumingly-s imple :)