Fix floating point exceptions

Graphics/Post.cpp

-// $Id: Post.cpp,v 1.29 2001-11-05 08:37:43 geuzaine Exp $
+// $Id: Post.cpp,v 1.30 2001-11-16 10:57:31 geuzaine Exp $
 
 #include "Gmsh.h"
 #include "GmshUI.h"
@@ -80,7 +80,9 @@ void Palette(Post_View *v, int nbi, int i){ /* i in [0,nbi-1] */
 void Palette2(Post_View *v,double min, double max, double val){ /* val in [min,max] */
   int index;  
 
-  index = (int)( (val-min)/(max-min)*(v->CT.size-1) + 0.5);
+  index = (min==max) ? 
+    v->CT.size/2 :
+    (int)( (val-min)/(max-min)*(v->CT.size-1) + 0.5);
 
   glColor4ubv((GLubyte *) &v->CT.table[index]);
 }

Plugin/LevelsetPlugin.cpp

-// $Id: LevelsetPlugin.cpp,v 1.20 2001-09-05 11:24:06 geuzaine Exp $
+// $Id: LevelsetPlugin.cpp,v 1.21 2001-11-16 10:57:33 geuzaine Exp $
 
 #include "LevelsetPlugin.h"
 #include "List.h"
@@ -81,6 +81,7 @@ Post_View *GMSH_LevelsetPlugin::execute (Post_View *v)
 	myVals[2] = vv;
       }
 
+      if(nx == 3 || nx == 4){      
 	double v1[3] = {Xp[2]-Xp[0],Yp[2]-Yp[0],Zp[2]-Zp[0]};
 	double v2[3] = {Xp[1]-Xp[0],Yp[1]-Yp[0],Zp[1]-Zp[0]};
 	double gr[3];
@@ -121,13 +122,12 @@ Post_View *GMSH_LevelsetPlugin::execute (Post_View *v)
 	  }
 	}
 	
-      if(nx == 3 || nx == 4){
 	for(k=0 ; k<3 ; k++) List_Add(View->ST, &Xp[k]);
 	for(k=0 ; k<3 ; k++) List_Add(View->ST, &Yp[k]);
 	for(k=0 ; k<3 ; k++) List_Add(View->ST, &Zp[k]);
 	for(k=0 ; k<3 ; k++) List_Add(View->ST, &myVals[k]);
 	View->NbST++;
-      }
+
 	if(nx == 4){	  
 	  for(k=2 ; k<5 ; k++) List_Add(View->ST, &Xp[k % 4]);
 	  for(k=2 ; k<5 ; k++) List_Add(View->ST, &Yp[k % 4]);
@@ -136,6 +136,7 @@ Post_View *GMSH_LevelsetPlugin::execute (Post_View *v)
 	  View->NbST++;
 	}
       }
+    }
 
     char name[1024],filename[1024];
     sprintf(name,"cut-%s",v->Name);