/*
 * Platform.as - the platform class for the platform game moving platform tutorial
 * Author: Stephen Harris, Kaiparasoft Ltd
 * 
 */
 
 class Platform extends MovieClip{
	
	// the direction the platform is currently moving, only relevant if movPlat == true
	var dirn;
	
	// the boundaries to the platforms movement
	var leftMost;
	var rightMost;
	
	// this flag determines in the game if this particular platform instance is a moving one
	var movPlat:Boolean = false;
	
	// the speed at which the platform moves if its a moving one
	var linearSpeed:Number;
	
	// constructor - empty
	function Platform(){
	}
	
	// update function called every frame only if the platform is a moving one
	function Update(){
		
		// switch direction when the platform reaches its limits
		if(_x > rightMost){
			dirn = -1;
		}
		if(_x < leftMost){
			dirn = 1;
		}
		
		// update its position based on direction and speed
		_x += linearSpeed*dirn;
	}
}