public boolean within(int pointX, int pointY) {
    	if (pointX >= this.centerX - this.radius && pointX <= this.centerX + this.radius) {
    		if (pointY >= this.centerY - this.radius && pointY <= this.centerY + this.radius) {
    			return true;
    		}
    	}
    	
    	return false;
    }