package rebelsky.twodim;

/**
 * A vector in two space, internally represented by angle
 * and radius.
 *
 * @author CSC152 2004F
 * @version 0.1 of September 2004
 */
public class NewTwoDimVector 
{

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

	double radius;
	double theta;

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

	public NewTwoDimVector(double _radius, double _theta)
	{
		this.radius = _radius;
		this.theta = _theta;
	} // NewTwoDimVector(double,double)

	
// +----------+-----------------------------------------------------
// | Mutators |
// +----------+

	public void setX(double newx)
	{
		double oldy= this.getY();
		this.radius = Math.sqrt(newx*newx + oldy*oldy);
		this.theta = Math.atan(oldy/newx);
	} // setX(double)

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

	public double dotProduct(NewTwoDimVector other)
	{
		return 0.0;  // STUB!
	} // dotProduct

	public double getX()
	{
		return Math.cos(this.theta) * this.radius;
	} // getX()
	
	public double getY()
	{
		return Math.sin(this.theta) * this.radius;
	} // getY()
	
	public double getDistanceFromOrigin()
	{
		return this.radius;
	} // getDistanceFromOrigin()
	
	/**
	 * Return a new vector that is a scaled version of the current vector.
	 */
	public NewTwoDimVector stretch(double factor)
	{
		return new NewTwoDimVector(this.radius*factor, this.theta);
	} // stretch(double)

} // class NewTwoDimVector