LACS09_Vector.java

//Vector.java       MrG 2012.0621
public class Vector
{
    private double x;
    private double y;

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

    public double getX()
    {
        return x;
    }

    public double getY()
    {
        return y;
    }

    public String toString()
    {
        return "<" + x + ", " + y + ">";
    }

    public Vector dilate(double size)
    {
        return new Vector(x*size,y*size);
    }

    public Vector sum(Vector other)
    {
        double tempX = this.x+other.getX();
        double tempY = this.y+other.getY();
        return new Vector(tempX,tempY);
    }

    public Vector diff(Vector other)
    {
        return this.sum(other.dilate(-1));
    }

    public double dot(Vector other)
    {
        return this.x*other.getX()+this.y*other.getY();
    }

    public double abs()
    {
        return Math.sqrt(this.dot(this));
    }
}