var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");

var y = 110;
var x = 10;
var speed = 0.5;

function movePlayer(){
  //context.clearRect(0, 0, canvas.width, canvas.height);
  context.beginPath();
  var player = new Image();
  player.src = "http://www.clker.com/cliparts/J/W/v/e/2/z/vertical-top-view-of-car-md.png";
  player.onload = function(){
    context.drawImage(player, x, y, player.width*0.4, player.height*0.13);
  }

  y = y - speed;

  if (y < -15){
    y = 110;
  }

  requestAnimationFrame(movePlayer);
}

requestAnimationFrame(movePlayer)