问在平铺的.json解析层之间绘制播放器

EN

$(function() {
  var c = document.getElementById("canvas").getContext('2d');

scene = {
  layers: [],
  renderLayer: function(layer) {

 /*
  if(layer.name == "Middle"){
    player.update();
  }
  */

  if (layer.type !== "tilelayer" || !layer.opacity) { return; }

  var s = c.canvas.cloneNode(),
      size = scene.data.tilewidth;
  s = s.getContext("2d");

  if (scene.layers.length < scene.data.layers.length) {
    layer.data.forEach(function(tile_idx, i) {
      if (!tile_idx) { return; }

      var img_x, img_y, s_x, s_y,
          tile = scene.data.tilesets[0];

      tile_idx--;
      img_x = (tile_idx % (tile.imagewidth / size)) * size;
      img_y = ~~(tile_idx / (tile.imagewidth / size)) * size;
      s_x = (i % layer.width) * size;
      s_y = ~~(i / layer.width) * size;
      s.drawImage(scene.tileset, img_x, img_y, size, size, s_x, s_y, size, size);
    });
    scene.layers.push(s.canvas.toDataURL());
    c.drawImage(s.canvas, 0, 0);
  }else {
    scene.layers.forEach(function(src) {
        //console.log(scene);
      var i = $("<img />", { src: src })[0];
      c.drawImage(i, 0, 0);
    });
  }
},
renderLayers: function(layers) {
  layers = Array.isArray(layers) ? layers : this.data.layers;
  layers.forEach(this.renderLayer);
},
loadTileset: function(json) {
  this.data = json;
  this.tileset = $("<img />", { src: json.tilesets[0].image })[0]
  this.tileset.onload = $.proxy(this.renderLayers, this);
},
load: function() {
  return $.ajax({
    url: "map.json",
    dataType: "text json"
  }).done($.proxy(this.loadTileset, this));
}
};
scene.load();
});

renderMap = function(){
  scene.renderLayers();
}