package {
	import flash.filters.ColorMatrixFilter;
	
	import mx.controls.Image;
	
	public class student_twitter_swarm_Tree {
		private var x:int, y:int;
		private var radius:int = 75, mood:String;
		public var image:Image;
		
		public function student_twitter_swarm_Tree (x:int, y:int, image:Image, mood:String):void {
			this.x = x;
	    	this.y = y;
	    	
	    	this.image = image;
	    	this.image.x = x - 75;
	    	this.image.y = y - 75;
	    	
	    	this.mood = mood;
	    	setColor(mood);
		}
		
		public function getX ():int {
			return this.x;
		}
		public function getY ():int {
			return this.y;
		}
		public function getRadius ():int {
			return this.radius;
		}
		public function getImage ():Image {
			return this.image;
		}
		public function getMood ():String {
			return this.mood;
		}
		
		public function distanceToBoid (boid:student_twitter_swarm_Boid):int {
			var distX:int = this.x - boid.getX(),
				distY:int = this.y - boid.getY();
			return Math.sqrt(distX * distX + distY * distY);
		}
		
		public function shake (boids:Array):void {
			// Find all boids within the tree radius and give them a random impulse.
			// The result is that they scatter.

			for(var i:int = 0; i < boids.length; i++) {
				if (this.distanceToBoid(boids[i]) <= this.radius) {
					boids[i].addRandomImpulse (10.0);
				}
			}
		}
		
		public function setColor (mood:String):void {
			// Sets the color of the filter to the given color.

			var color:Array = [];
			color[color.length] = ["happy", 0.3, 1.0, 0.3];
			color[color.length] = ["sad", 	0.2, 0.2, 1.0];
			color[color.length] = ["angry", 0.9, 0.9, 0.0];
			color[color.length] = ["tired", 0.8, 0.8, 0.8];
			color[color.length] = ["love", 	1.0, 0.2, 0.2];
			
			for(var i:int = 0; i < color.length; i++) {
				if (mood == color[i][0]) {
					setFilter(color[i][1], color[i][2], color[i][3]); 
				}
			}
		}
		private function setFilter (red:Number, green:Number, blue:Number): void {
			// Filters the image back to the color that the boid was initialised with.
			
			this.image.filters = []

			// channel Red, Green, Blue and Alpha
			var bwMatrix: Array = [	red, 0, 0, 0, 0,
									0, green, 0, 0, 0,
									0, 0, blue, 0, 0,
									0, 0, 0, 1, 0];
			
			var filter:ColorMatrixFilter = new ColorMatrixFilter (bwMatrix); 
			this.image.filters = [filter]; 
		}
	}
}