How to set up a camera (Citrus Engine recipe)

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// In a GameState, the parameters are the object to follow, the offset, the bounds and the easing.
view.camera.setUp(hero, new Point(stage.stageWidth / 2, stage.stageHeight / 2), new Rectangle(0, 0, 1550, 450), new Point(.25, .05));

// You can add more interactivity :
stage.addEventListener(MouseEvent.MOUSE_WHEEL, _mouseWheel);
CitrusEngine.getInstance().input.keyboard.addKeyAction("rotate", Keyboard.X);

private function _mouseWheel(mEvt:MouseEvent):void {
	
	if (e.delta > 0)
		_camera.setZoom(_camera.getZoom() + 0.1);
	else if (e.delta < 0)
		_camera.setZoom(_camera.getZoom() - 0.1);
}

override public function update(timeDelta:Number):void {

	super.update(timeDelta);
	
	if (CitrusEngine.getInstance().input.justDid("rotate"))
		_camera.rotate(Math.PI / 2);
}