Ude af scope?

Kode 

var self = this;
function animate(t, dt)
{
  self.graphic.scale += dt/self.speed;
}

Kode 

var speed = 10;
this.graphic.addFrameListener(this.animate);
var graphic = this.graphic;
					
function animate(t, dt)
{
  graphic.scale += dt/speed;
}

Kode 

function addFrameListener(func, obj) {
  this.func = func;
  this.obj = obj;
}

function callFrameListener(t, dt){
  this.func.apply(this.obj, [t, dt]);
}

Kode 

Function.prototype.delegate = function(o) {
	var m = this;
	return function() { 
		return m.apply(o||window);
	}
}

var Explosion = function() {
	this.text = 'I am in motion';
	this.animate = function() {
		alert(this.text||'error');
	}
}

var fx = new Explosion();

fx.animate(); // I am in motion

var fn = fx.animate.delegate(fx);
fn(); // I am in motion

var fn = fx.animate.delegate(window);
fn(); // error

setTimeout(fx.animate.delegate(fx),1000); // I am in motion 

Kode 

function delegate( that, thatMethod ) {
    return function() { return thatMethod.call(that); }
}

Kode 

Function.prototype.delegate = function(o) {
	var m = this;
	return function() { 
		return m.apply(o||window);
	}
}

var test = function() {
};

test.delegate(this);

Kode 

this.speed = 10;
this.graphic.addFrameListener(this.animate.delegate(this));

Kode 

function explosion(x_pos, y_pos)
{
	this.radius = 1; //pixels
	this.duration = 5; //seconds
	this.speed = 100;
	this.graphic = new Circle(this.radius,
	{
		fill: '#FFFFFF',
		x: x_pos,
		y: y_pos,
	});

	this.animate = function(t, dt)
	{
		this.graphic.scale += dt/this.speed;
	}

	this.graphic.addFrameListener(this.animate);

	this.resume = function()
	{
		game.append(this.graphic);
	};
}

Kode 

function explosion(x_pos, y_pos)
{
	this.radius = 1; //pixels
	this.duration = 5; //seconds
	this.speed = 100;
	this.graphic = new Circle(this.radius,
	{
		fill: '#FFFFFF',
		x: x_pos,
		y: y_pos,
	});

	var self = this;
	this.animate = function(t, dt)
	{
		self.graphic.scale += dt/self.speed;
	}

	this.graphic.addFrameListener(this.animate);

	this.resume = function()
	{
		game.append(this.graphic);
	};
}

Kode 

Function.prototype.delegate = function(o) {
	var m = this;
	return function() { 
		return m.apply(o||window);
	}
}

function explosion(x_pos, y_pos) {
	this.radius = 1; //pixels
	this.duration = 5; //seconds
	this.speed = 100;
	this.graphic = new Circle(this.radius, {
		fill: '#FFFFFF',
		x: x_pos,
		y: y_pos,
	});

	this.animate = function(t, dt) {
		this.graphic.scale += dt/this.speed;
	}

	this.graphic.addFrameListener(this.animate.delegate(this));

	this.resume = function() {
		game.append(this.graphic);
	};
}