uberpong/dev/lib/game/entities/ball.js

ig.module(
	'game.entities.ball'
)
.requires(
	'impact.entity'
)
.defines(function(){

EntityBall = ig.Entity.extend({

	name: 'ball',

	size: {x: 24, y: 24},
	collides: ig.Entity.COLLIDES.ACTIVE,
	type: ig.Entity.TYPE.B,

	animSheet: new ig.AnimationSheet( 'media/ball.png', 24, 24 ),

	bounciness: 1,
	maxVel: {x: 1000, y: 1000},

	init: function( x, y, settings ) {
		this.parent( x, y, settings );
		
		this.addAnim( 'idle', 1, [0] );

		this.randomVel();
	},

	ready: function() {
		this.startPos = {x: this.pos.x, y: this.pos.y};
	},

	collideWith: function( other, axis ) {
		if(other.name == 'paddle') {
			// the horizontal speed of the ball multiplied
			// every time it hits a paddle
			this.vel.x *= 1.15;

			// the paddles y movement is added to the ball,
			// so that players can give the ball a spin
			this.vel.y += other.vel.y/2;
		}
	},

	reset: function() {
		this.randomVel();

		this.pos.x = this.startPos.x;
		this.pos.y = this.startPos.y;
	},

	randomVel: function() {
		this.vel.x = (Math.random()*(100)) + 100;
		if(Math.random() > .5) this.vel.x *= -1;
		this.vel.y = (Math.random()*20) + 50;
	}

});

});