engine.js

; 

networld.Engine = (function($){
  
  var $node,
      ready = false,
      keys = {},
      mouse = {x:0,y:0},
      cursor,
      player,
      netPlayers = {},
      images,
      socket,
      loopInterval,
      syncInterval;
  
  var options = {},
      defaults = {
        node: null,
        fps: 60,
        syncRate: 0.1,
        images: {},
        cursor:null,
        loadPlayer: function(){},
        loadGameObjects: function(){},
        loadCursor: function(){},
        loop: function(){},
        sync: function(){},
        receiveData: function(){}
      }
  
  function init(o){
    options = $.extend(true, defaults, o);
    $node = $(options.node);
    socket = new io.Socket();
    socket.on('message', function(data){
      options.receiveData.call({netPlayers:netPlayers, $node:$node, images:images}, data);
    });
    socket.connect();
    loadAssets(function(){
      loadPlayer();
      loadGameObjects();
      loadCursor();
      attachEvents();
      launch();
    });
  }
  
  function loadCursor(){
    cursor = options.loadCursor.call({$node:$node, images:images, mouse:mouse});
  }
  
  function loadAssets(callback, context){
    images = new networld.ImageManager();
    images.load(options.images, function(){
      callback.call(context);
    }, 20000);
  }
  
  function loadPlayer(){
    player = options.loadPlayer.call({$node:$node, images:images, socket:socket});
  }
  
  function loadGameObjects(){
    options.loadGameObjects.call(this, $node);
  }
  
  function attachEvents(){
    $(window).keyup(function(e){
      e.preventDefault();
      if(keys[e.keyCode]){
        keys[e.keyCode] = false;
      }
    });
    $(window).keydown(function(e){
      e.preventDefault();
      if(!keys[e.keyCode]){
        keys[e.keyCode] = true;
      }
    });
    $(window).mousemove(function(e){
      mouse.x = e.pageX;
      mouse.y = e.pageY;
    });
  }
  
  function sync(){
    options.sync.call({player:player, netPlayers:netPlayers, keys:keys, mouse:mouse, socket:socket});
  }
  
  function loop(){
    if(cursor != null){
      cursor.x = mouse.x;
      cursor.y = mouse.y;
      cursor.update();
    }
    options.loop.call({player:player, netPlayers:netPlayers, keys:keys, mouse:mouse, cursor:cursor, socket:socket});
  }
  
  function launch(){
    try{
      loopInterval = setInterval(loop, 1000 / options.fps);
      syncInterval = setInterval(sync, 1000 * options.syncRate);
    }catch(e){
      clearInterval(loopInterval);
      clearInterval(syncInterval);
      console.log(e);
      throw(e);
    }
  }
  
  return function(opts) {
    init(opts);
  }
  

})(jQuery);