Fix crash when zoomed in
Fix crash when zoomed in

ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,collint8/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,collint8/SCIRun,jcollfont/SCIRun,moritzdannhauer/SCIRunGUIPrototype,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jcollfont/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jessdtate/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,collint8/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,collint8/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,ajanson/SCIRun,jessdtate/SCIRun,collint8/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jessdtate/SCIRun,jessdtate/SCIRun