Initial attempt at road generation

Tools/MapViewer/MapViewer/Model/Bitmap24.cs

@@ -68,5 +68,35 @@ namespace TransportGame.MapViewer.Model
 
             return 3 * (x + y * Width);
         }
+
+        public void DrawLine(int x0, int y0, int x1, int y1, Color color)
+        {
+            int dx = Math.Abs(x1 - x0);
+            int sx = x0 < x1 ? 1 : -1;
+
+            int dy = Math.Abs(y1 - y0);
+            int sy = y0 < y1 ? 1 : -1;
+
+            int err = (dx > dy ? dx : -dy) / 2, e2;
+
+            for (; ; )
+            {
+                this[x0, y0] = color;
+                if (x0 == x1 && y0 == y1)
+                    break;
+
+                e2 = err;
+                if (e2 > -dx) 
+                {
+                    err -= dy; 
+                    x0 += sx; 
+                }
+                if (e2 < dy) 
+                { 
+                    err += dx; 
+                    y0 += sy; 
+                }
+            }
+        }
     }
 }