package graphics;

public class Sphere extends Shape
{
  public Sphere()
  {
    super(25, 25);
  }

  public Sphere(int newM, int newN)
  {
    super(newM, newN);
  }

  //convert u/v pair to xyz point
  protected double[] calculatePoint(double u, double v)
  {
    //System.err.println("calculatePoint("+u+", "+v+")");

    //point-normal-texture
    double[] vertex = {0,0,0, 0,0,0, 0,0};

    double theta = 2 * Math.PI * u;
    double phi = Math.PI * v - Math.PI/2;

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

    //ignore normal for now
    vertex[6] = u;
    vertex[7] = v;

    return vertex;
  }

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

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

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

    return newSphere;
  }
}