// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 9-9: An array of Car objects
  
  // The Car class does not change whether we are making one car, 100 cars or 1,000 cars!
  class Car { 
    color c;
    float xpos;
    float ypos;
    float xspeed;
  
    Car(color c_, float xpos_, float ypos_, float xspeed_) {
      c = c_;
      xpos = xpos_;
      ypos = ypos_;
      xspeed = xspeed_;
    }
  
    void display() {
      rectMode(CENTER);
      stroke(0);
      fill(c);
      rect(xpos,ypos,20,10);
    }
  
    void move() {
      xpos = xpos + xspeed;
      if (xpos > width) {
        xpos = 0;
      }
    }
  }