//CS5-HMC-Sp.,00-HW10-1
//A. Khakpour, Apr., 00

import java.applet.*;
import java.awt.*;

// An applet to perform a simple animation.
public class Drive1 extends Applet
{  
   private final int MOVE = 2;
   private final int RIGHT_SIDE = 450;
   private final int NUM_POINTS = 10;
   private final int PAUSE = 50000;

   private int[] car_x = {80, 70, 70, 90, 95, 140, 150, 175, 180, 170};
   private int[] car_y = {190, 190, 170, 170, 155, 155, 170, 170, 190, 190};

   private int[] car_x_update = new int[NUM_POINTS];

   //  Performs the animation.
   public void paint (Graphics g)
   {
      g.setXORMode(getBackground());

      //  Loop until the car drives off the right side.
      for (int offset=1; offset < RIGHT_SIDE; offset += MOVE)
      {
         draw_car(offset, g);  // draw the car
         for (int pause=1; pause < PAUSE; pause++);
         draw_car(offset, g);  // erase the car
      }
   }  


   //  Draws the car at a particular x offset.
   public void draw_car(int offset, Graphics g)
   {

      //  Update x coordinates
      for (int scan = 0; scan < NUM_POINTS; scan++)
         car_x_update[scan] = car_x[scan] + offset;

      g.setColor(Color.red);
      g.drawPolyline(car_x_update, car_y, 10);    
      g.drawArc(80+offset, 180, 20, 20, 0, 180);
      g.drawArc(150+offset, 180, 20, 20, 0, 180);
      g.drawLine(100+offset, 190, 150+offset, 190);

      g.setColor(Color.blue);
      g.drawOval(83+offset, 183, 14, 14);
      g.drawOval(153+offset, 183, 14, 14);
      g.drawLine(85+offset, 170, 85+offset, 140);
   }  
}