Hi Bill, I do not see a problem with picking TArcs. Could you send me a copy of your canvas in the form canvas.C and canvas.root ? Rene Brun William Hanlon wrote: > > 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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