Vector2d

testVector2d.js

/**
 * Running tests
 * Create Vectors two-dimensional 
 */
var v1 = new Vector2d(1,2);
var v2 = new Vector2d(3,4);

/**
 * Vector.getX  
 * Vector.setX
 */
console.log(v1.getX());
v1.setX(1);
console.log(v1.getX());

/**
 * Vector.getY  
 * Vector.setY
 */
console.log(v2.getX());
v2.setX(3);
console.log(v2.getX());

/**
 * Vector.scale
 * Vector.toString 
 */ 
v1.scale(2);
console.log(v1.toString());

/**
 * Vector.add
 */
v1.add(v2);
console.log(v1.toString());

/**
 * Vector.sub
 */
v1.sub(v2);
console.log(v1.toString());
/**
 * Vector.negate
 */
v1.negate();
console.log(v1.toString());

/**
 * Vector.length
*/
console.log(v1.length());

/**
 * Vector.lengthSquared
 */
console.log(v1.lengthSquared());

/**
 * Vector.normalize
 */
console.log(v1.normalize());

/**
 * Vector.rotate
 */
v1.rotate(Math.PI * 0.5);
console.log(v1.toString());

Vector2d.js

var Vector2d = function () {
    
    this.x = arguments[0] || 0;
    this.y = arguments[1] || 0;
    
    /**
     * @method: setX
     * @param: int
     */
    this.setX = function (x) {
        this.x = x;
    };
    
    /**
     * @method: setY
     * @param: int
     */
    this.setY = function (y) {
        this.y = y;
    };
    
    /**
     * @method: getX
     */
    this.getX = function () {
        return this.x;
    };
    
    /**
     * @method: getY
     */
    this.getY = function () {
        return this.y;
    }
    
    /**
     * @method: scale
     */
    this.scale = function (s) {
        this.x *= s;
        this.y *= s;
    };
    
     /**
     * @method: add
     * @param: Vector
     */
    this.add = function (vector) {  
        this.x += vector.x;
        this.y += vector.y;
    };

     /**
     * @method: sub
     * @param: Vector
     */    
    this.sub = function (vector) {
        this.x -= vector.x;
        this.y -= vector.y;
    };
    
     /**
     * @method: negate
     */    
    this.negate = function () {
        this.x = -this.x;
        this.y = -this.y;
    };
    
    /**
     * @method: length
     */
    this.length = function (){
        return Math.sqrt(this.x * this.x + this.y * this.y);
    };
    
     /**
     * @method: lengthSquared
     */
    this.lengthSquared = function () {
        return this.x * this.x + this.y * this.y;
    };

     /**
     * @method: normalize
     */    
    this.normalize = function () {
        var len = this.length();
        if (len) {
            this.x /= len;
            this.y /= len;
        }
        return len;
    };

     /**
     * @method: rotate
     * @param: int
     */        
    this.rotate = function (angle) {
        var x = this.x,
            y = this.y,
            cosVal = Math.cos(angle),
            sinVal = Math.sin(angle);
        this.x = this.x * cosVal - this.y * sinVal;
        this.y = this.x * sinVal + this.y * cosVal; 
    };
    
     /**
     * @method: rotate
     */        
    this.toString = function () {
        return "(" + this.getX() + ","  + this.getY() + ")";  
    };
};