package physics2D;

public class Vector2D implements Cloneable
{

    protected double xComponent;
    protected double yComponent;
    protected double magnitude;
    protected double angle;

    public Vector2D(double magnitude, double angle)
    {
        this.magnitude = magnitude;
        this.angle = angle % (2 * Math.PI);
        xComponent = Math.sin(angle) * magnitude;
        yComponent = Math.cos(angle) * magnitude;
    }

    public Vector2D(double xComponent, double yComponent, boolean components)
    {
        this.xComponent = xComponent;
        this.yComponent = yComponent;
        magnitude = Math.sqrt(Math.pow(xComponent, 2) + Math.pow(yComponent, 2));
        angle = Math.atan2(xComponent, yComponent);
    }

    public Vector2D()
    {
        this(0,0);
    }

    public double getMagnitude()
    {
        return magnitude;
    }

    public double getAngle()
    {
        return angle;
    }

    public double getXComponent()
    {
        return xComponent;
    }

    public double getYComponent()
    {
        return yComponent;
    }

    public Vector2D add(Vector2D v)
    {
        Vector2D n = (Vector2D) this.clone();
        n.xComponent += v.xComponent;
        n.yComponent += v.yComponent;
        n.magnitude = Math.sqrt(Math.pow(n.xComponent, 2) + Math.pow(n.yComponent, 2));
        n.angle = Math.atan2(n.xComponent, n.yComponent);
        return n;
    }

    public Vector2D subtract(Vector2D v)
    {
        return add(v.multiply(-1));
    }

    public Vector2D multiply(double d)
    {
        Vector2D n = (Vector2D) this.clone();
        n.xComponent *= d;
        n.yComponent *= d;
        n.magnitude *= d;
        if (d < 0)
        {
            magnitude *= -1;
            n.angle = (n.angle + Math.PI) % (2 * Math.PI);
        }
        return n;
    }

    public Vector2D divide(double d)
    {
        return multiply(1/d);
    }

    public Vector2D rotate(double d)
    {
        return new Vector2D(magnitude, angle + d);
    }

    protected Vector2D(double magnitude, double angle, double xComponent, double yComponent)
    {
        this.magnitude = magnitude;
        this.angle = angle;
        this.xComponent = xComponent;
        this.yComponent = yComponent;
    }

    public Object clone()
    {
        return new Vector2D(magnitude, angle, xComponent, yComponent);
    }

}