class Warp {
	var mc:MovieClip;
	var Z:Array;
	var base_z:Number = 1;
	var maxI:Number = 18;
	// keitai- > var cx = 300, cy = 400, w = _root.400, h = 640;
	var cx = 300, cy = 350, w = 400, h = 400;
	
	var shift = 0, col;
	var mode:Number;
	
	function Warp(mc:MovieClip, mode:Number){
		this.mc = mc;
		this.mode = mode;
		this.Z = new Array();
	}
	
	function z_init(){
		for(var i = 0; i < maxI; i++)
			Z[i] = base_z + i * 0.5;
	}
	
	function getX(i:Number):Number{ return cx * (1 - 1 / Z[i]); }
	function getY(i:Number):Number{ return cy * (1 - 1 / Z[i]); }
	function getW(i:Number):Number{ return w / Z[i]; }
	function getH(i:Number):Number{ return h / Z[i]; }
	
	function getAlpha(i:Number):Number{ 
		var a:Number = 15 * (Z[i] - 0.8); 
		if(a > 15) a = 15;
		if(a < 0) a = 0;
		return a;
	}
	
	function onDraw(){
		mc.clear();
		if(mode == 0)
			drawRect(0, 0, w, h, 0, 255);
		//else 
		//	drawRect(0, 0, w, h, getCol((shift) * Math.PI / 8), 10);
		for(var i = maxI - 1; i > 0 ; i--){
			var x0:Number = getX(i);
			var y0:Number = getY(i);
			var w0:Number = getW(i);
			var h0:Number = getH(i);
			var alpha:Number = getAlpha(i);
			var myCol = getCol((shift + i) * Math.PI / 8);
			//if(i == maxI-1) trace(shift+i);
			if(x0 < 0) x0 = 0;
			if(y0 < 0) y0 = 0;
			if(w0 > w) w0 = w;
			if(h0 > h) h0 = h;
			drawRect(x0, y0, w0, h0, myCol, alpha);
			
		}
	}
	
	function drawRect(x0:Number, y0:Number, w0:Number, h0:Number,
					  col:Number, alpha:Number){
		mc.lineStyle();
		mc.beginFill(col, alpha);// alpha
		mc.moveTo(x0, y0);
		mc.lineTo(x0, y0 + h0);
		mc.lineTo(x0 + w0, y0 + h0);
		mc.lineTo(x0 + w0, y0);
		mc.lineTo(x0 + w0, y0);
		mc.lineTo(x0, y0);
		mc.endFill();
	}
	
	function getCol(colT:Number){
		var v0, v1;
		if(mode == 0){
			var v0 = 0x33;
			var v1 = 0xff;
		} else {
			var v0 = 0x44;
			var v1 = 0x88;
		}
		var r = int(v0 * Math.sin(colT) + v1);
		var g = int(v0 * Math.sin(colT + Math.PI * 2 / 3) + v1);
		var b = int(v0 * Math.sin(colT + Math.PI * 4 / 3) + v1);
		if(r > 0xff) r = 0xff;
		if(g > 0xff) g = 0xff;
		if(b > 0xff) b = 0xff;
		if(r < 0) r = 0;
		if(g < 0) g = 0;
		if(b < 0) b = 0;
		return r * 0x10000 + g * 0x100 + b;
	}
	
	function onTick(){
		base_z -= 0.1;
		if(base_z <= 0.01){
			shift += 1;
			base_z += 1;
		}
		z_init();
		onDraw();
	}
}