import java.awt.*;

public class example3 extends BufferedApplet
{
   int w = 0, h = 0;
   double cx = 0, cy = 0;
   double deltaX = 0, deltaY = 0;
   double time0 = 0, time = 0;
   Font font = new Font("Helvetica", Font.BOLD, 30);

   double timePerFrame = 0.01;
   double elapsed = 0, prevElapsed = 0;

   public void render(Graphics g) {
      if (w == 0) {
	 w = bounds().width;
	 h = bounds().height;
	 time0 = System.currentTimeMillis() / 1000.0;

	 cx = w / 2;
	 cy = h;
      }

      prevElapsed = elapsed;
      time = System.currentTimeMillis() / 1000.0;
      elapsed = (time - time0);

      if (prevElapsed != 0) {
         timePerFrame = 0.95 * timePerFrame +
                        0.05 * (elapsed - prevElapsed);
      }

      g.setColor(Color.black);
      g.fillRect(0, 0, w, h);

      drawMyCharacter(g, (int)cx, (int)cy);

      cy += deltaY;

      if (cy >= h) {
	 cy = h;
	 deltaY = 0;
      }

      deltaY += 2 * timePerFrame;

      animating = true;
   }

   void drawMyCharacter(Graphics g, int x, int y) {
      g.setColor(Color.red);
      g.fillRect(x - 20, y - 40, 40, 40);
      g.setColor(Color.black);
      g.fillRect(x - 10, y - 30, 20, 30);
   }

   public boolean mouseUp(Event e, int x, int y) { 
      deltaY = -200 * timePerFrame;
      return true;
   }

   public boolean mouseMove(Event e, int x, int y) { 
      return true;
   }
}