import java.util.Vector;  //  http://java.sun.com/products/jdk/1.1/docs/api/java.util.Vector.html



//---- Scene

public class Scene
{
  //---- Data

  //- Camera

  private double camera_x=0, camera_y=0, camera_z=-8;
  private double camera_rx=0, camera_ry=0;

  //- Output buffer

  private int[] buf = null;
  private int w = 0, h = 0;

  //- Shapes in this scene

  private Vector shapes;

  //- Transformation stack

  private Transform[] trans;
  private int numTransforms;

  //---- Main code

  public Scene()
  {
    shapes = new Vector();

    trans = new Transform[32];
    numTransforms = 0;
  }

  //---- addShape

  public void addShape(Shape s)
  {
    shapes.addElement(s);
  }

  //---- setGraphics

  public void setGraphics(int[] buf, int w, int h)
  {
    this.buf = buf; this.w = w; this.h = h;
  }

  //---- setCamera

  public void setCamera(double x, double y, double z, double rx, double ry)
  {
    camera_x = x; camera_y = y; camera_z = z;
    camera_rx = rx; camera_ry = ry;
  }

  //---- plotPoint

  public void plotPoint(double x, double y, double z)
  {
    //  Transform point

    double[] t = {x, y, z, 1};

    t = trans[numTransforms-1].multiply(t);

    //  Screen space point

    double sx = w*0.5 + 150.0*t[0]/(t[2]);
    double sy = h*0.5 + 150.0*t[1]/(t[2]);

    //  Plot

    buf[(int)sx + w*(int)sy] = 0xFFFFFF;
  }

  //---- transform

  public void transform(Transform t)
  {
    trans[numTransforms] = new Transform(trans[numTransforms-1]);
    trans[numTransforms].transform(t);
    numTransforms ++;
  }

  //---- untransform

  public void untransform()
  {
    numTransforms --;
  }

  //---- render

  public void render()
  {
    //- Set up transformation stack

    trans[0] = new Transform();

    trans[0].translate(-camera_x, -camera_y, -camera_z);
    trans[0].rotateY(-camera_ry);
    trans[0].rotateX(-camera_rx);

    numTransforms = 1;

    //- Render shapes

    for(int i=0; i<shapes.size(); i++) ((Shape)shapes.elementAt(i)).render();

    //- Done
  }
}