Ball.js

"use strict";

function Ball(initPos,color){
	this.initPos = initPos;
    this.position = initPos.copy();
    this.origin = new Vector2(25,25);
    this.velocity = Vector2.zero;
    this.color = color; 
    this.moving = false;
    this.visible = true;
    this.inHole = false;
}

Object.defineProperty(Ball.prototype, "color",
    {
    	get: function(){
    		if(this.sprite == sprites.redBall){
    			return Color.red;
    		}
    		else if(this.sprite == sprites.yellowBall){
    			return Color.yellow;
    		}
			else if(this.sprite == sprites.blackBall){
    			return Color.black;
    		}
    		else{
    			return Color.white;
    		}
    	},
        set: function (value) {
            if (value === Color.red){
                this.sprite = sprites.redBall;
            }
            else if(value == Color.yellow){
            	this.sprite = sprites.yellowBall;
            }
			else if(value == Color.black){
            	this.sprite = sprites.blackBall;
            }
            else{
            	this.sprite = sprites.ball;
            }
        }
    });

Ball.prototype.shoot = function(power, angle){
    if(power <= 0)
        return;

    this.moving = true;

    this.velocity = calculateBallVelocity(power,angle);
}

var calculateBallVelocity = function(power, angle){

    return new Vector2(100*Math.cos(angle)*power,100*Math.sin(angle)*power);
}

Ball.prototype.update = function(delta){

    this.updatePosition(delta);

    this.velocity.multiplyWith(0.98);

	if(this.moving && Math.abs(this.velocity.x) < 1 && Math.abs(this.velocity.y) < 1){
        this.stop();
    }
}

Ball.prototype.updatePosition = function(delta){

    if(!this.moving || this.inHole)
        return;
    var ball = this;
    var newPos = this.position.add(this.velocity.multiply(delta));


	if(Game.policy.isInsideHole(newPos)){
        if(Game.sound && SOUND_ON){
            var holeSound = sounds.hole.cloneNode(true);
            holeSound.volume = 0.5;
            holeSound.play();
        }
		this.position = newPos;
        this.inHole = true;
        setTimeout(function(){ball.visible=false;ball.velocity = Vector2.zero;}, 100);
        Game.policy.handleBallInHole(this);
		return;
	}

    var collision = this.handleCollision(newPos);

    if(collision){
		this.velocity.multiplyWith(0.95);
    }else{
    	this.position = newPos;
    }
}

Ball.prototype.handleCollision = function(newPos){

	var collision = false;

	if(Game.policy.isXOutsideLeftBorder(newPos, this.origin)){
        this.velocity.x = -this.velocity.x;
        this.position.x = Game.policy.leftBorderX + this.origin.x;
        collision = true;
    }
    else if(Game.policy.isXOutsideRightBorder(newPos, this.origin)){
        this.velocity.x = -this.velocity.x;
        this.position.x = Game.policy.rightBorderX - this.origin.x;
        collision = true;
    }

    if(Game.policy.isYOutsideTopBorder(newPos, this.origin)){
        this.velocity.y = -this.velocity.y;
        this.position.y = Game.policy.topBorderY + this.origin.y;
        collision = true;
    }
    else if(Game.policy.isYOutsideBottomBorder(newPos, this.origin)){
        this.velocity.y = -this.velocity.y;
        this.position.y = Game.policy.bottomBorderY - this.origin.y;
        collision = true;
    }

    return collision;
}

Ball.prototype.stop = function(){

    this.moving = false;
    this.velocity = Vector2.zero;
}

Ball.prototype.reset = function(){
	this.inHole = false;
	this.moving = false;
	this.velocity = Vector2.zero;
	this.position = this.initPos;
	this.visible = true;
}

Ball.prototype.out = function(){

	this.position = new Vector2(0, 900);
	this.visible = false;
	this.inHole = true;

}

Ball.prototype.draw = function () {
    if(!this.visible)
        return;

	Canvas2D.drawImage(this.sprite, this.position, 0, 1, new Vector2(25,25));
};