Fix a problem in TMultiGraph::Paint following the unzoom of the Y axis

when the Y axis title was non null


git-svn-id: http://root.cern.ch/svn/root/trunk@3799 27541ba8-7e3a-0410-8455-c3a389f83636

graf/src/TMultiGraph.cxx

-// @(#)root/graf:$Name:  $:$Id: TMultiGraph.cxx,v 1.5 2002/01/23 17:52:49 rdm Exp $
+// @(#)root/graf:$Name:  $:$Id: TMultiGraph.cxx,v 1.6 2002/01/24 11:39:28 rdm Exp $
 // Author: Rene Brun   12/10/2000
 
 /*************************************************************************
@@ -183,9 +183,26 @@ void TMultiGraph::Paint(Option_t *option)
      rwxmax    = gPad->GetUxmax();
      rwymin    = gPad->GetUymin();
      rwymax    = gPad->GetUymax();
+     char *xtitle = 0;
+     char *ytitle = 0;
+     Int_t firstx = 0;
+     Int_t lastx  = 0;
+     
      if (fHistogram) {
         //cleanup in case of a previous unzoom
         if (fHistogram->GetMinimum() >= fHistogram->GetMaximum()) {
+           Int_t nch = strlen(fHistogram->GetXaxis()->GetTitle());
+           firstx = fHistogram->GetXaxis()->GetFirst();
+           lastx  = fHistogram->GetXaxis()->GetLast();
+           if (nch) {
+              xtitle = new char[nch+1];
+              strcpy(xtitle,fHistogram->GetXaxis()->GetTitle());
+           }
+           nch = strlen(fHistogram->GetYaxis()->GetTitle());
+           if (nch) {
+              ytitle = new char[nch+1];
+              strcpy(ytitle,fHistogram->GetYaxis()->GetTitle());
+           }
            delete fHistogram;
            fHistogram = 0;
         }
@@ -265,6 +282,9 @@ void TMultiGraph::Paint(Option_t *option)
         fHistogram->SetMaximum(rwymax);
         fHistogram->GetYaxis()->SetLimits(rwymin,rwymax);
         fHistogram->SetDirectory(0);
+        if (xtitle) {fHistogram->GetXaxis()->SetTitle(xtitle); delete [] xtitle;}
+        if (ytitle) {fHistogram->GetYaxis()->SetTitle(ytitle); delete [] ytitle;}
+        if (firstx != lastx) fHistogram->GetXaxis()->SetRange(firstx,lastx);
      }
      fHistogram->Paint();
    }