package KinematicSimulator;

/**
 * A mathematical Vector, two dimensional.
 *
 * @author Steve
 */

class Vector2D
{
    public Vector2D add(Vector2D vector2d)
    {
        Vector2D vector2d1 = new Vector2D(x + vector2d.x, y + vector2d.y);
        return vector2d1;
    }

    public double dot(Vector2D vector2d)
    {
        return x * vector2d.x + y * vector2d.y;
    }

    Vector2D(double d, double d1)
    {
        x = d;
        y = d1;
    }

    Vector2D(Vector2D vector2d)
    {
        x = vector2d.x;
        y = vector2d.y;
    }

    public double length()
    {
        return Math.sqrt(Math.pow(x, 2D) + Math.pow(y, 2D));
    }

    public double get_x()
    {
        return x;
    }

    public double get_y()
    {
        return y;
    }

    public double angle()
    {
        return Math.atan2(x, y);
    }

    public Vector2D negative()
    {
        Vector2D vector2d = new Vector2D(-x, -y);
        return vector2d;
    }

    public Vector2D scale(double d)
    {
        return new Vector2D(x * d, y * d);
    }

    public Vector2D subtract(Vector2D vector2d)
    {
        Vector2D vector2d1 = new Vector2D(x - vector2d.x, y - vector2d.y);
        return vector2d1;
    }

    public Vector2D projection(Vector2D vector2d)
    {
        Vector2D vector2d1 = scale(dot(vector2d) / Math.pow(length(), 2D));
        return vector2d1;
    }

    private double x;
    private double y;
}