//<pre>
import java.awt.*;
import render.*;

public class SimpleExample extends RenderApplet
{
   Geometry upperLeftArm, lowerLeftArm;
   Geometry upperRightArm, lowerRightArm;
   String message = "no message";
   Matrix cam = new Matrix();

   public void drawOverlay(Graphics g) {
      g.setColor(Color.black);
      g.drawString(message, 5, 14);
   }

   public void initialize() {

      message = getParameter("fred");

      Material plastic = new Material();
      plastic.setAmbient(.2,0,0);
      plastic.setDiffuse(.8,0,0);
      plastic.setSpecular(1,1,1,10);

      setBgColor(.6,.6,.8);

      addLight(1,1,1, 1,1,1);

      upperLeftArm = getWorld().add().ball(4);
      upperLeftArm.setMaterial(plastic);
      lowerLeftArm = getWorld().add().ball(4);
      lowerLeftArm.setMaterial(plastic);

      upperRightArm = getWorld().add().ball(4);
      upperRightArm.setMaterial(plastic);
      lowerRightArm = getWorld().add().ball(4);
      lowerRightArm.setMaterial(plastic);
   }

   public void animate(double time) {

      double leftSignal  = 3 * time;
      double rightSignal = 3 * time + Math.PI;

      double leftShoulder = Math.sin(leftSignal);
      double leftElbow    = Math.cos(leftSignal) * .5 + .5;

      double rightShoulder = Math.PI - Math.sin(rightSignal);
      double rightElbow    = - (Math.cos(rightSignal) * .5 + .5);

      // TRANSFORM MY CAMERA

      cam.identity();
      cam.translate(0, time, 0);

      // APPLY INVERSE OF CAMERA HERE TO MATRIX ON STACK

      m().invert(cam);


      rotateZ(0.3 * Math.sin(3 * time + 1));

      push();
	 translate(1,0,0);
         rotateZ(leftShoulder);
         limb(upperLeftArm);
         translate(2,0,0);
         rotateZ(leftElbow);
         limb(lowerLeftArm);
      pop();

      push();
	 translate(-1,0,0);
         rotateZ(rightShoulder);
         limb(upperRightArm);
         translate(2,0,0);
         rotateZ(rightElbow);
         limb(lowerRightArm);
      pop();
   }

   void limb(Geometry shape) {
      push();
         translate(1,0,0);
         scale(1,0.2,0.2);
         transform(shape);
      pop();
   }
}