package rebelsky.twodim;

/**
 * A vector in two space.
 *
 * @author AUTHOR
 * @version VERSION
 */
public class TwoDimVector1
{

// +--------+-------------------------------------------------------
// | Fields |
// +--------+

	double xcoord;
	double ycoord;

// +--------------+-------------------------------------------------
// | Constructors |
// +--------------+

	public TwoDimVector1(double x, double y)
	{
		this.xcoord = x;
		this.ycoord = y;
	} // TwoDimVector1(double,double)

	public TwoDimVector1()
	{
		this.xcoord = 0.0;
		this.ycoord = 0.0;
	} // TwoDimVector1()
	
// +----------+-----------------------------------------------------
// | Mutators |
// +----------+

	public void setX(double newX) 
	{
		this.xcoord = newX;
	} // setX()

	public void setY(double newY) 
	{
		this.ycoord = newY;
	} // setY()

// +-----------+----------------------------------------------------
// | Observers |
// +-----------+

	public double dotProduct(TwoDimVector1 other)
	{
		return ((this.xcoord*other.xcoord) + (this.ycoord*other.ycoord));
	} // dotProduct

	public double getX()
	{
		return this.xcoord;
	} // getX()
	
	public double getY()
	{
		return this.ycoord;
	} // getY()
	
	public double getDistanceFromOrigin()
	{
		return Math.sqrt(this.xcoord*this.xcoord + this.ycoord*this.ycoord);
	} // getDistanceFromOrigin()
	
	/**
	 * Return a new vector that is a scaled version of the current vector.
	 */
	public TwoDimVector1 stretch(double factor)
	{
		TwoDimVector1 result = new TwoDimVector1();
		result.setX(this.xcoord * factor);
		result.setY(this.ycoord * factor);
		return result;
		// Multiply the x coordinate by factor
		// Multiply the y coordinate by factor
		// Shove the two things into a vector and return it
	} // stretch(double)

} // class TwoDimVector1