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                   <Array>Cool Game<Array>
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                (function() {
    var requestAnimationFrame = window.requestAnimationFrame ||
window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame
|| window.msRequestAnimationFrame;
    window.requestAnimationFrame = requestAnimationFrame;
})();

var canvas = document.getElementById("canvas"),
    ctx = canvas.getContext("2d"),
    width = 300,
    height = 400,
    score = 0,
    highScore = 0,
    dead = false,
      player = {
      colX : 10,
      colY : 10,
      width : 50,
      height : 50,
      centerX : 50/2,
      centerY : 50/2,
      x : width/2,
      y : height - 5,
      speed: 50,
      accel : 1.5,
      velX: 0,
      velY: 0,
    },
    keys = [],
    friction = 0.8,
    gravity = 0.1;

var spike = {
         x: width*Math.random(),
         y: 0,
         colX :10,
         colY : 10,
         width : 40,
         height : 40,
         centerX : 40/2,
         centerY : 40/2,
         speed: 4,
         velY: 0,
      }


canvas.width = width;
canvas.height = height;
// load sprites
var playerImg = document.getElementById("player_right");
var pokeBall = document.getElementById("pokeBall");

//create functions for the game
function collision(col1,col2){
      if(Math.abs(col1.y-col2.y) <Array>= height){
       spike.y = 0-spike.height;
       spike.velY = 0;
       spike.x = (width-spike.width)*Math.random()+spike.centerX;
       score += 1
       gravity += 0.01;
       }
   else{
       spike.velY += gravity;
       }
//player inputs
if(dead ==false){ 
  // check keys
  //  if (keys[38]) {
        // up arrow or space
  //    if(!player.jumping){
//       player.jumping = true;
 //      player.velY = -player.jumpSpeed;
//      }
//    }
    if (keys[39]) {
        // right arrow
        if (player.velX <Array> -player.speed) {
           
            player.velX-=player.accel ;
        }
    }
}
    player.velX *= friction;

    player.velY += gravity;

    player.x += player.velX;
    player.y += player.velY;
    spike.y += spike.velY;

    if (player.x >= width-player.colX) {
        player.x = width-player.colX;
    } else if (player.x-player.colX <Array>= 310-player.colY){
        player.y = 310-player.colY;
        player.jumping = false;
    }
  //clear all stuff
    ctx.clearRect(0,0,width,height);

  //draw background 
  ctx.drawImage(background,0, 0, 600, height);
  //draw spikes
  ctx.drawImage(pokeBall,(spike.x-spike.centerX), (spike.y-spike.centerY), spike.width, spike.height);
  //draw player
  if(player.velX >0){
          playerImg = document.getElementById("player_right");
   }
  if(player.velX<Array> highScore){
         highScore = score;
         }
     }
  if  (keys[16] && dead==true){
      score = 0;
      dead = false;
     }
  

  requestAnimationFrame(update);
}

document.body.addEventListener("keydown", function(e) {
    keys[e.keyCode] = true;
});

document.body.addEventListener("keyup", function(e) {
    keys[e.keyCode] = false;
});

window.addEventListener("load",function(){
    update();
});
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