fixed panning bug

pointer.js

@@ -120,6 +120,7 @@ export class Pointer {
   }
 
   handlePointerDown({x: clientX, y: clientY}) {
+    this.updatePointer({x: clientX, y: clientY});
     if (this.sim.isCurrentMode(MODE_MASS_GENERATION)) {
       const {x, y} = this.sim.screenToSim(clientX, clientY)
       this.sim.objects.handlePointerDown({x, y});
@@ -130,7 +131,7 @@ export class Pointer {
         viewOriginStart: this.sim.display.viewOrigin,
         pointerStart: {x: clientX, y: clientY},
         pointerCurrent: {x: clientX, y: clientY},
-        velocity: this.getPointerVelocity(),
+        velocity: {x: 0, y: 0},
       };
     }
   }

simulator.js

@@ -72,7 +72,6 @@ export class Sim {
     this.pointer.clearPointerHistory();
     if (this.pointer.panning) {
       this.pointer.panning = undefined;
-      // TODO: Maybe show velocity vectors relative to view velocity
     }
   }