Modify TPolyLine::DistancetoPrimitive to support the case of a filled and closed

polyline. In this case the object is picked when the mouse is inside
the polygone, otherwise the object is picked only when the mouse is closed
to one of lines of the polyline.


git-svn-id: http://root.cern.ch/svn/root/trunk@7510 27541ba8-7e3a-0410-8455-c3a389f83636

graf/src/TPolyLine.cxx

-// @(#)root/graf:$Name:  $:$Id: TPolyLine.cxx,v 1.14 2002/10/31 07:27:35 brun Exp $
+// @(#)root/graf:$Name:  $:$Id: TPolyLine.cxx,v 1.15 2002/11/05 16:09:15 brun Exp $
 // Author: Rene Brun   12/12/94
 
 /*************************************************************************
@@ -151,6 +151,11 @@ Int_t TPolyLine::DistancetoPrimitive(Int_t px, Int_t py)
       d = DistancetoLine(px, py, gPad->XtoPad(fX[i]), gPad->YtoPad(fY[i]), gPad->XtoPad(fX[i+1]), gPad->YtoPad(fY[i+1]));
       if (d < distance) distance = d;
    }
+
+//*-*- in case of a closed and filled polyline, check if we are inside
+   if (fFillColor && fFillStyle && fX[0] == fX[fLastPoint] && fY[0] == fY[fLastPoint]) {
+      if (TMath::IsInside(gPad->AbsPixeltoX(px),gPad->AbsPixeltoY(py),fLastPoint+1,fX,fY)) distance = 0;
+   }
    return distance;
 }