Method setDirection

src/engineMath.js:761–772

Sets this this vector to point in the specified integer direction (0-3), corresponding to multiples of 90 degree rotation * @param {number} [direction] * @param {number} [length] * @return {Vector2}

(direction, length=1)

     * @param {number} [length]
     * @return {Vector2} */
    setDirection(direction, length=1)
    {
        ASSERT_NUMBER_VALID(direction);
        ASSERT_NUMBER_VALID(length);
        direction = mod(direction, 4);
        ASSERT(direction===0 || direction===1 || direction===2 || direction===3,
            'Vector2.setDirection() direction must be an integer between 0 and 3.');
        
        this.x = direction%2 ? direction-1 ? -length : length : 0;
        this.y = direction%2 ? 0 : direction ? -length : length;
        return this;
    }

    /** Returns the integer direction of this vector, corresponding to multiples of 90 degree rotation (0-3)
     * @return {number} */