package graphics;

public class Spiral extends Shape
{
  double turns = 1.5; //# of times spiral curls around

  public Spiral()
  {
    super(25, 2);
    wrap = false;

  }

  public Spiral(int newM, int newN)
  {
    super(newM, newN);
    wrap = false;
  }

  //convert u/v pair to xyz point
  protected double[] calculatePoint(double u, double v)
  {
    //point-normal pair
    double[] vertex = {0,0,0, 0,0,0, 0,0};

    double theta = turns * 2 * Math.PI * u;

    vertex[0] = Math.exp(-u) * Math.cos(theta); //x
    vertex[1] = Math.exp(-u) * Math.sin(theta); //y
    vertex[2] = v; //z

    //vertex[3] = Math.cos(theta); //nx
    //vertex[4] = Math.sin(theta); //ny
    //vertex[5] = 0; //nz

    vertex[6] = u;
    vertex[7] = v;

    return vertex;
  }

  //gotta overwrite this b/c of casting issues :-/
  public Object clone()
  {
    Spiral newSpiral = new Spiral(M, N);

    for (int i=0; i<vertices.length; i++)
      newSpiral.setVertex(i, vertices[i]);

    for (int i=0; i<faces.length; i++)
      newSpiral.setFace(i, faces[i]);

    return newSpiral;
  }
}