var sys=require("sys");

function linear_draw() {
    if (this.end == 1) return;
    var percent = (Date.now() - this.starttime)/this.duration;
	if (percent > 1) percent = 1;
    this.obj[2] = (this.targetx-this.startposx)*percent+this.startposx;
    this.obj[5] = (this.targety-this.startposy)*percent+this.startposy;
	this.app.refresh();
	var self = this;
	if (percent < 1) {
	    this.obj.timer=setTimeout(function() { self.draw();}, 20);
		return;
	}
	this.app.refresh();
	this.obj.animated_linear = null;
}
function linear(app,obj,targetx,targety,duration) {
    try {
        if (obj.animated_linear) {
	        obj[5] = obj.animated_linear.targety;
	        obj[2] = obj.animated_linear.targetx;
			obj.animated_linear.end = 1;
		}
	} catch(e) {
	    
	}
	obj.animated_linear = this;
	this.app = app;
	this.obj = obj;
	this.end = 0;
	this.starttime = Date.now();
	this.startposx = obj[2];
	this.startposy = obj[5];
    this.targetx = targetx;
	this.targety = targety;
	this.duration = duration*1000;
}

exports.linear = linear;
linear.prototype.start = linear_draw;
linear.prototype.draw = linear_draw;

function multiply(s,d) {
    var m=[];
	m[0] = s[0]*d[0]+s[1]*d[3];
	m[1] = s[0]*d[1]+s[1]*d[4];
	m[2] = s[0]*d[2]+s[1]*d[5]+s[2];
	m[3] = s[3]*d[0]+s[4]*d[3];
	m[4] = s[3]*d[1]+s[4]*d[4];
	m[5] = s[3]*d[2]+s[4]*d[5]+s[5];
	s[0] = m[0];
	s[1] = m[1];
	s[2] = m[2];
	s[3] = m[3];
	s[4] = m[4];
	s[5] = m[5];
}


function scale_draw() {
    if (this.end == 1) return;
    var percent = (Date.now() - this.starttime)/this.duration;
	if (percent > 1) percent = 1;
	//sys.puts("time="+(Date.now()-this.starttime)+" percent="+percent);
    var sx = (this.targetx-this.startsx)*percent+this.startsx;
    var sy = (this.targety-this.startsy)*percent+this.startsy;
	var t=[sx,0,0,0,sy,0];
	//sys.puts("center="+this.obj.center.x+","+this.obj.center.y);
	this.obj[0] = sx;
	this.obj[4] = sy;
	this.obj[2] = this.origin_offset_x - (sx-this.startsx)*this.obj.center.x;
	this.obj[5] = this.origin_offset_y - (sy-this.startsy)*this.obj.center.y;
	//sys.puts("sx="+sx);
	//sys.puts("sy="+sy);
	//sys.puts("offseet x="+this.obj[2]);
	//sys.puts("offseet y="+this.obj[5]);

	this.app.refresh();
	var self = this;
	if (percent < 1) {
	    this.obj.timer=setTimeout(function() { self.draw();}, 20);
		return;
	}
	this.app.refresh();
	this.obj.animated_scale = null;
}

function scale(app,obj,targetx,targety, duration) {
    try {
        if (obj.animated_scale) {
	        //obj[0] = obj.animated_scale.targetx;
	        //obj[4] = obj.animated_scale.targety;
			//obj[2] = obj.animated_scale.final_offset_x;
			//obj[5] = obj.aninated_scale.final_offset_y;
			obj.animated_scale.end = 1;
		}
	} catch(e) {
	    
	}
	obj.animated_scale = this;
	this.app = app;
	this.obj = obj;
	this.end = 0;
	this.starttime = Date.now();
	this.startsx = obj[0];
	this.startsy = obj[4];
    this.targetx = targetx;
	this.targety = targety;
	this.duration = duration*1000;
	this.origin_offset_x = obj[2];
	this.origin_offset_y = obj[5];
	this.final_offset_x = this.origin_offset_x-(targetx-this.startsx)*obj.center.x;
	this.final_offset_y = this.origin_offset_y-(targety-this.startsy)*obj.center.y;
}


exports.scale = scale;
scale.prototype.start = scale_draw;
scale.prototype.draw = scale_draw;