Vector2D

package azaza;

public class Vector2D implements IVector {
    private final double x,y;

    public Vector2D(double x, double y) {
        this.x = x;
        this.y = y;
    }

    @Override
    public int dimension() {
        return 2;
    }

    @Override
    public double getComponent(int i) {
        switch (i) {
            case 0:
                return x;
            case 1:
                return y;
            default:
                throw new IllegalArgumentException();
        }
    }

    @Override
    public double scalar(IVector v) {
        return x*x + y*y;
    }

    @Override
    public double length() {
        return Math.sqrt(x * x + y * y);
    }

    @Override
    public IVector multiply(double number) {
        return new Vector2D(number * x, number * y);
    }

    @Override
    public IVector add(IVector v) {
        return new Vector2D(x + v.getComponent(0), y + v.getComponent(1));

    }

    @Override
    public IVector sub(IVector v) {
        return new Vector2D(x - v.getComponent(0), y - v.getComponent(1));
    }
}