Hi, I using the ROOT gui classes (TG*) to write a stand alone display program. I have a canvas on which I draw a lot of TArcs to represent a detector, then I overlay another set of TArcs to represent elements of the detector that have been "hit". My problem is that when I move my mouse over a TArc that represents a hit element I get "*** Break *** floating point exception" in my shell window. This does not happen though when I move my mouse over TArcs that are not "hit". I draw my TArcs through a function call using a statically allocated TArc then drawing this TArc repeatedly through a call of DrawArc for each detector element needed. I do not see a difference in the general method by which I implement hit and non-hit elements, so I do not understand why I have this problem only for TArcs that represent hit elements. Does anyone have an idea as to what would cause a floating point exception when mousing over a gui element like the one I described? Thanks, Bill
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