Fix zooming too fast with trackpad

SupEngine/src/Input.ts

@@ -364,7 +364,10 @@ export default class Input extends EventEmitter {
 
   private onMouseWheel = (event: MouseWheelEvent) => {
     event.preventDefault();
-    this.newScrollDelta = (event.wheelDelta > 0 || event.detail < 0) ? 1 : -1;
+    this.newScrollDelta = 0;
+    if ((event.wheelDelta || event.detail) !== 0) {
+      this.newScrollDelta = (event.wheelDelta > 0 || event.detail < 0) ? 1 : -1;
+    }
     return false;
   };
 

SupEngine/src/components/Camera2DControls.ts

@@ -1,4 +1,5 @@
 import * as THREE from "three";
+import { throttle } from "lodash";
 import ActorComponent from "../ActorComponent";
 import Actor from "../Actor";
 import Camera from "./Camera";
@@ -47,6 +48,8 @@ export default class Camera2DControls extends ActorComponent {
     if (this.zoomCallback != null) this.zoomCallback();
   }
 
+  throttledChangeOrthographicScale = throttle(this.changeOrthographicScale, 75, { trailing: false });
+
   update() {
     let input = this.actor.gameInstance.input;
     let keys = (<any>window).KeyEvent;
@@ -84,7 +87,7 @@ export default class Camera2DControls extends ActorComponent {
       }
 
       if (newOrthographicScale != null && newOrthographicScale !== this.camera.orthographicScale) {
-        this.changeOrthographicScale(newOrthographicScale, mousePosition.x, mousePosition.y);
+        this.throttledChangeOrthographicScale(newOrthographicScale, mousePosition.x, mousePosition.y);
       }
     }
   }