/* <action jsname="action_CopyPositionAbs" description="Copy Absolute Position Animated">
	<property name="Child" type="scenenode"/>
	<property name="Parent" type="scenenode"/>
	<property name="MoveSpeed" type="float" default="5"/>
</action>
*/

var cpaRegister; // an object containing the list of registered nodes and their states

action_CopyPositionAbs = function(){ 
	this.lastTime = new Date().getTime(); 
	if(!cpaRegister) cpaRegister = {};
}

action_CopyPositionAbs.prototype.execute = function(){
	this.childName = ccbGetSceneNodeProperty(this.Child, "Name");
	var childPosition = ccbGetSceneNodeProperty(this.Child, "Position");
	var targetPosition = ccbGetSceneNodeProperty(this.Parent, "PositionAbs");
	var distance = childPosition.substract(targetPosition).getLength();	

	// if the distance is short enough don't register a new frame event and set the position
    if(Math.round(distance) <= this.MoveSpeed * 0.1){
        ccbSetSceneNodeProperty(this.Child, "Position", targetPosition);
        return;
    } 

    if(cpaRegister[this.childName]) return; // node is already registered

    // registering a new frame event for the child node
    var cpa = this;
    this._Update = function(){ cpa.Update(); };
	ccbRegisterOnFrameEvent(this._Update);
	cpaRegister[this.childName] = true; // setting this child's flag to true to prevent multiple frame events on the same node
}

action_CopyPositionAbs.prototype.Update = function(){
	// time
    this.absTime = new Date().getTime();
    this.deltaTime = this.absTime - this.lastTime;
    this.lastTime = this.absTime;

	var childPosition = ccbGetSceneNodeProperty(this.Child, "Position");
	var targetPosition = ccbGetSceneNodeProperty(this.Parent, "PositionAbs");
	var movementVect = childPosition.substract(targetPosition);
	var distance = movementVect.getLength();
	movementVect.normalize();
	movementVect.x *= this.MoveSpeed * this.deltaTime * 0.01;
	movementVect.y *= this.MoveSpeed * this.deltaTime * 0.01;
	movementVect.z *= this.MoveSpeed * this.deltaTime * 0.01;
	childPosition = childPosition.substract(movementVect);
    if(Math.round(distance) > this.MoveSpeed * this.deltaTime * 0.01){
        ccbSetSceneNodeProperty(this.Child, "Position", childPosition);
    } else {
    	ccbSetSceneNodeProperty(this.Child, "Position", targetPosition);
    	ccbUnregisterOnFrameEvent(this._Update); // target reached, unregistering this event
    	cpaRegister[this.childName] = false; // setting node's registered state to false
    }
}