Box2D Forums

public override function scrollRotation():Number {
    scaleX = focus.scaleX;
    scaleY = focus.scaleY;
    return focus.rotation;
}

[Inspectable(defaultValue=0.2)]
public var scrollEase:Number = 0.2;

...

public function updateScroll(e:Event = null):void {
   /// If we have a focus object, then find the new position of the focus object in the viewport.
   if(focus) {
      pos = Util.localizePoint(this, focus);
   }
   var p:Point = pos.clone();
   rot = scrollRotation();
   var r:Number = rot;
   /// If mid-focus-change, tween from the old position & rotation to the new one.
   if(tFunc != null && tPos != null) {
      if(++tFrames == tFramesTot) {
         tFunc = null;
      }
      else {
         r = tFunc(tFrames, tRot, Util.findBetterAngleTarget(tRot, r) - tRot, tFramesTot);
         p.x = tFunc(tFrames, tPos.x, p.x - tPos.x, tFramesTot);
         p.y = tFunc(tFrames, tPos.y, p.y - tPos.y, tFramesTot);
      }
   }
   /// Set the position and rotation of the viewport.
   rotation = r;
   var oldX:Number = x;
   var oldY:Number = y;
   x = 0;
   y = 0;
   p = localToGlobal(p);
   x = oldX + ((stage.stageWidth / 2 - p.x) - oldX) * scrollEase;
   y = oldY + ((stage.stageHeight / 2 - p.y) - oldY) * scrollEase;
   /// Nudge the viewport based on the mouse.
   if(Input.mouseDetected) {
      //x += (stage.stageWidth / 2 - Input.mousePos.x) * (tFunc != null ? tFunc(tFrames, tMX, mouseNudgeX - tMX, tFramesTot) : mouseNudgeX);
      //y += (stage.stageHeight / 2 - Input.mousePos.y) * (tFunc != null ? tFunc(tFrames, tMY, mouseNudgeY - tMY, tFramesTot) : mouseNudgeY);
   }
   x = Math.round(x);
   y = Math.round(y);
   if(shake) {
      x += shake.x;
      y += shake.y;
      shake.normalize(shake.length * -0.5);
      if(shake.length < 1) {
         shake = null;
      }
   }
}

   public class Camera extends Entity
   {
      
      public function Camera(){
         this.addEventListener(Event.ENTER_FRAME,enterFrame);
         
      }
      private var n:Number=0;
      private function enterFrame(e:Event):void
      {
         //move the cam and make it loop back to origin
         this.y          = 225 + Math.sin(n)*225;
         this.scaleX    = 3 + Math.sin(n)*3;
         this.scaleY    = 3 + Math.sin(n)*3;
         this.rotation    = (n / 8)*30;
         n+=0.05;
      }
   }

   [Inspectable(name="orientToFocus", variable="orientToFocus", type="Boolean", defaultValue="false")]

      
    public class DWorld extends World {
      
   public var orientToFocus:Boolean;



...

   
      public override function scrollRotation():Number {
         
         //if orient to gravity set, do rotations of the world based on gravity
         if(orientToGravity) {
            var b:BodyShape = focus as BodyShape;
            var g:V2 = getGravityFor(V2.fromP(pos).divideN(scale), b ? b.b2body : null, b);
            return (Math.atan2(g.y, -g.x) * Util.R2D) - 90;
         }
         
         //if orient to focus set, manipulate the world based on the properties of the focus object (ie. the camera)
         if(orientToFocus) {
            scaleX = focus.scaleX;
             scaleY = focus.scaleY;
             return focus.rotation;
         }
         
         //else just return standard rotation
         return rot;
         
      }

    }