diff --git a/cs677/final/mpi-fractals.cc b/cs677/final/mpi-fractals.cc
index 2902f58..2bfa625 100644
--- a/cs677/final/mpi-fractals.cc
+++ b/cs677/final/mpi-fractals.cc
@@ -46,15 +46,15 @@ int main(int argc, char * argv[])
     {
         if (!strncmp(argv[i], "-w", 2))
         {
-            width = atoi(strlen(argv[i]) > 2 ? argv[i] + 1 : argv[++i]);
+            width = atoi(strlen(argv[i]) > 2 ? argv[i] + 2 : argv[++i]);
         }
         else if (!strncmp(argv[i], "-h", 2))
         {
-            height = atoi(strlen(argv[i]) > 2 ? argv[i] + 1 : argv[++i]);
+            height = atoi(strlen(argv[i]) > 2 ? argv[i] + 2 : argv[++i]);
         }
         else if (!strncmp(argv[i], "-t", 2))
         {
-            fractal_type = atoi(strlen(argv[i]) > 2 ? argv[i] + 1 : argv[++i]);
+            fractal_type = atoi(strlen(argv[i]) > 2 ? argv[i] + 2 : argv[++i]);
         }
     }
     getSizes(&my_rank, &world_size, &nprocs);
@@ -104,6 +104,30 @@ int main(int argc, char * argv[])
                     if (event.key.keysym.sym == SDLK_q)
                         going = false;
                     break;
+                case SDL_MOUSEBUTTONDOWN:
+                    switch (event.button.button)
+                    {
+                        case 1:         /* left-click to re-center */
+                            x_center = getXVirt(event.button.x);
+                            y_center = getYVirt(event.button.y);
+                            redraw = true;
+                            break;
+                        case 3:         /* re-center AND zoom in */
+                            x_center = getXVirt(event.button.x);
+                            y_center = getYVirt(event.button.y);
+                            zoom /= 2.0;
+                            redraw = true;
+                            break;
+                        case 4:         /* zoom in */
+                            zoom /= 2.0;
+                            redraw = true;
+                            break;
+                        case 5:         /* zoom out */
+                            zoom *= 2.0;
+                            redraw = true;
+                            break;
+                    }
+                    break;
             }
         }
     }