let carWidth, carHeight;

let carColor;

let wheelWidth, wheelHeight;

let speed;

​

function setup() {

  createCanvas(800, 600);

  //setup the car

  rectMode(CENTER);

  posX = width/2;

  posY = height/2;

  carWidth = 100;

  carHeight = carWidth/2.5;

  carColor = color(255,0,0);

  wheelWidth = carWidth * .2;

  wheelHeight = wheelWidth/2.5;

}

​

function draw() {

  background(255);

  //car body

  fill(carColor);

  noStroke();

  rect(posX, posY, carWidth, carHeight);

  fill(0);

  //left top wheel

  rect(posX-carWidth/2 + wheelWidth/2, posY - carHeight/2-wheelHeight/2, wheelWidth, wheelHeight);

  //right top wheel

  rect(posX+carWidth/2 - wheelWidth/2, posY - carHeight/2-wheelHeight/2, wheelWidth, wheelHeight);

  //left bottom wheel

  rect(posX-carWidth/2 + wheelWidth/2, posY + carHeight/2+wheelHeight/2, wheelWidth, wheelHeight);

  //right bottom wheel

  rect(posX+carWidth/2 - wheelWidth/2, posY + carHeight/2+wheelHeight/2, wheelWidth, wheelHeight);

  //drive the car

  posX += 10;

  if (posX > width+carWidth/2) {

    posX = -carWidth/2;

  }

}