Fixed a bug in drawing geometry

@ Added a test case for drawing
@ Added some ToString functions for elements

Source/Geometry/Tools.cs

@@ -946,10 +946,10 @@ namespace CodeImp.DoomBuilder.Geometry
 								{
 									// Now we take the two linedefs with adjacent angles to the drawn line
 									List<Linedef> lines = new List<Linedef>(v.Linedefs);
-									lines.Sort(new LinedefAngleSorter(firstline, true, firstline.End));
+									lines.Sort(new LinedefAngleSorter(firstline, true, firstline.Start));
 									startpoints.Add(new LinedefSide(lines[0], true));
 									startpoints.Add(new LinedefSide(lines[0], false));
-									lines.Sort(new LinedefAngleSorter(firstline, false, firstline.End));
+									lines.Sort(new LinedefAngleSorter(firstline, false, firstline.Start));
 									startpoints.Add(new LinedefSide(lines[0], true));
 									startpoints.Add(new LinedefSide(lines[0], false));
 								}
@@ -970,10 +970,10 @@ namespace CodeImp.DoomBuilder.Geometry
 								{
 									// Now we take the two linedefs with adjacent angles to the drawn line
 									List<Linedef> lines = new List<Linedef>(v.Linedefs);
-									lines.Sort(new LinedefAngleSorter(firstline, true, lastline.Start));
+									lines.Sort(new LinedefAngleSorter(firstline, true, lastline.End));
 									endpoints.Add(new LinedefSide(lines[0], true));
 									endpoints.Add(new LinedefSide(lines[0], false));
-									lines.Sort(new LinedefAngleSorter(firstline, false, lastline.Start));
+									lines.Sort(new LinedefAngleSorter(firstline, false, lastline.End));
 									endpoints.Add(new LinedefSide(lines[0], true));
 									endpoints.Add(new LinedefSide(lines[0], false));
 								}

Source/Map/Linedef.cs

@@ -906,6 +906,12 @@ namespace CodeImp.DoomBuilder.Map
 			}
 		}
 
+		// String representation
+		public override string ToString()
+		{
+			return "Linedef " + GetIndex();
+		}
+		
 		#endregion
 
 		#region ================== Changes

Source/Map/Sector.cs

@@ -535,6 +535,12 @@ namespace CodeImp.DoomBuilder.Map
 			General.Map.IsChanged = true;
 		}
 
+		// String representation
+		public override string ToString()
+		{
+			return "Sector " + GetIndex();
+		}
+		
 		#endregion
 
 		#region ================== Changes

Source/Map/Vertex.cs

@@ -264,6 +264,12 @@ namespace CodeImp.DoomBuilder.Map
 			General.Map.IsChanged = true;
 		}
 
+		// String representation
+		public override string ToString()
+		{
+			return "Vertex (" + pos + ")";
+		}
+
 		#endregion
 	}
 }

Tests/Drawing/AutoCloseFail1.dbs

@@ -0,0 +1,30 @@
+type = "Doom Builder Map Settings Configuration";
+gameconfig = "ZDoom_Doom.cfg";
+strictpatches = 0;
+
+maps
+{
+	
+	MAP01
+	{
+		
+		grid
+		{
+			backoffsety = 0;
+			backoffsetx = 0;
+			backscalex = 1f;
+			gridsize = 16;
+			background = "";
+			backsource = 0;
+			backscaley = 1f;
+		}
+		
+		
+		resources
+		{
+		}
+		
+	}
+	
+}
+