1 files changed, 13 insertions, 6 deletions
diff --git a/main.c b/main.c
index e798cdd..9edb8bf 100644
--- a/main.c
+++ b/main.c
@@ -54,6 +54,7 @@ int main(void)
   camera.zoom     = 1.0f;
   InitWindow(state.window_len, state.window_len, "Abelian sand pile");
   SetTargetFPS(60);
+  const float zoom = 0.125f;
 
   while (!WindowShouldClose())
   {
@@ -61,17 +62,23 @@ int main(void)
 
     if (IsKeyPressed(KEY_UP) || IsKeyDown(KEY_UP))
     {
-      Vector2 world_pos = GetScreenToWorld2D(GetMousePosition(), camera);
-      camera.offset     = GetMousePosition();
+      Vector2 centre    = {state.window_len / 2, state.window_len / 2};
+      Vector2 world_pos = GetScreenToWorld2D(centre, camera);
+      camera.offset     = centre;
       camera.target     = world_pos;
-      camera.zoom += 0.125f;
+      camera.zoom += zoom;
+      if (camera.zoom < zoom)
+        camera.zoom = zoom;
     }
     if (IsKeyPressed(KEY_DOWN) || IsKeyDown(KEY_DOWN))
     {
-      Vector2 world_pos = GetScreenToWorld2D(GetMousePosition(), camera);
-      camera.offset     = GetMousePosition();
+      Vector2 centre    = {state.window_len / 2, state.window_len / 2};
+      Vector2 world_pos = GetScreenToWorld2D(centre, camera);
+      camera.offset     = centre;
       camera.target     = world_pos;
-      camera.zoom -= 0.125f;
+      camera.zoom -= zoom;
+      if (camera.zoom < zoom)
+        camera.zoom = zoom;
     }
 
     if (IsMouseButtonDown(MOUSE_BUTTON_LEFT))