Car class

int xInput;
  int speed;
  color carColor;
  color back;
  int i;
  int sped;
  boolean Forward;

  Car(int big, int yKey, color car, color nice, int speed, boolean direction){
    size = big;
    yInput = yKey;
    carColor = car;
    back = nice;
    sped = speed;
    Forward = direction;
    if (Forward) {
      xInput = size * -1;
    }
    else {
      xInput = size + width;
    }
  }

  void display() {
    for(int i = 0; i < sped; i++){
      background(back);
      if(Forward) {
        xInput++;
      }
      else {
        xInput--;
      }
      carBody();
    }
  }

  void carBody() {
    rectMode(CENTER);
    stroke(0, 0, 0);
    fill(carColor);
    rect(xInput, yInput + size/4, size * 2, size/2);
    quad(xInput - size/2, yInput, xInput - size/4, yInput - size/2, xInput + size/4, yInput - size/2, xInput + size/2, yInput);
    fill(0, 0, 0);
    ellipse(xInput - size * 2/3, yInput + size/2, size/2, size/2);
    ellipse(xInput + size * 2/3, yInput + size/2, size/2, size/2);
  }
}