Merge branch 'master' of github.com:CartoDB/torque into data-peek

.travis.yml

@@ -1,3 +1,6 @@
+before_install:
+ - sudo apt-get install -y pkg-config libcairo2-dev libjpeg8-dev libgif-dev
+
 language: node_js
 node_js:
   - "0.10"

NEWS

@@ -1,3 +1,20 @@
+2.11.1
+
+2.11.0
+    - Do not fix values in the edge (#147)
+    - Windshaft provider accepts an optional data type for coordinates (#149)
+    - Acceptance tests
+    - renderTile accepts a callback to be called when rendering finishes
+    - tile rendering deferred until all assets are loaded
+    - sprite rendering now scales source to marker dimensions
+    - Filters accept a canvas class
+
+2.10.1
+    - Adjusted point position taking resolution into account
+    - Changed loop: false to pause animation at last frame
+    - On torque-frame-count: 1, always pause for better performance
+    - Fixes getTimeSpan
+
 2.10.0
     - Adds timetostep method to torque layer
     - Function qualifyURL can be provided to not rely on document's one

dist/torque.uncompressed.js

@@ -48,6 +48,9 @@ var cancelAnimationFrame = global.cancelAnimationFrame
         this.running = true;
         requestAnimationFrame(this._tick);
         this.options.onStart && this.options.onStart();
+        if(this.options.steps === 1){
+          this.running = false;
+        }
     },
 
     isRunning: function() {
@@ -82,6 +85,7 @@ var cancelAnimationFrame = global.cancelAnimationFrame
       this.range = torque.math.linear(0, this.options.steps);
       this.rangeInv = this.range.invert();
       this.time(this._time);
+      this.start();
       return this;
     },
 
@@ -120,9 +124,12 @@ var cancelAnimationFrame = global.cancelAnimationFrame
       this._t0 = t1;
       this._time += delta;
       if(this.step() >= this.options.steps) {
-        this._time = 0;
         if(!this.options.loop){
-          this.stop();
+          // set time to max time
+          this.time(this.options.animationDuration);
+          this.pause();
+        } else {
+          this._time = 0;
         }
       }
       if(this.running) {
@@ -663,6 +670,7 @@ module.exports.TorqueLayer = TorqueLayer;
   var types = {
     Uint8Array: typeof(global['Uint8Array']) !== 'undefined' ? global.Uint8Array : Array,
     Uint32Array: typeof(global['Uint32Array']) !== 'undefined' ? global.Uint32Array : Array,
+    Int16Array: typeof(global['Int16Array']) !== 'undefined' ? global.Int16Array : Array,
     Int32Array: typeof(global['Int32Array']) !== 'undefined' ? global.Int32Array: Array
   };
 
@@ -1577,7 +1585,7 @@ GMapsTorqueLayer.prototype = torque.extend({},
 
   providers: {
     'sql_api': torque.providers.json,
-    'url_template': torque.providers.jsonarray,
+    'url_template': torque.providers.JsonArray,
     'windshaft': torque.providers.windshaft
   },
 
@@ -1703,7 +1711,7 @@ GMapsTorqueLayer.prototype = torque.extend({},
       if (tile) {
         pos = this.getTilePos(tile.coord);
         ctx.setTransform(1, 0, 0, 1, pos.x, pos.y);
-        this.renderer.renderTile(tile, this.key, pos.x, pos.y);
+        this.renderer.renderTile(tile, this.key);
       }
     }
   },
@@ -1754,6 +1762,14 @@ GMapsTorqueLayer.prototype = torque.extend({},
     return new Date(time);
   },
 
+  timeToStep: function(timestamp) {
+    if (typeof timestamp === "Date") timestamp = timestamp.getTime();
+    if (!this.provider) return 0;
+    var times = this.provider.getKeySpan();
+    var step = (this.provider.getSteps() * (timestamp - times.start)) / (times.end - times.start);
+    return step;
+  },
+
   getStep: function() {
     return this.key;
   },
@@ -1908,7 +1924,7 @@ module.exports.GMapsTileLoader = gmaps.GMapsTileLoader;
 module.exports.GMapsTorqueLayer = gmaps.GMapsTorqueLayer;
 module.exports.GMapsTiledTorqueLayer = gmaps.GMapsTiledTorqueLayer;
 
-},{"./animator":1,"./cartocss_reference":2,"./common":3,"./core":4,"./gmaps":8,"./leaflet":12,"./math":15,"./mercator":16,"./provider":18,"./renderer":23,"./request":26}],11:[function(require,module,exports){
+},{"./animator":1,"./cartocss_reference":2,"./common":3,"./core":4,"./gmaps":8,"./leaflet":12,"./math":15,"./mercator":16,"./provider":18,"./renderer":23,"./request":27}],11:[function(require,module,exports){
 require('./leaflet_tileloader_mixin');
 
 /**
@@ -2323,7 +2339,7 @@ L.TorqueLayer = L.CanvasLayer.extend({
 
   providers: {
     'sql_api': torque.providers.json,
-    'url_template': torque.providers.jsonarray,
+    'url_template': torque.providers.JsonArray,
     'windshaft': torque.providers.windshaft
   },
 
@@ -2394,14 +2410,11 @@ L.TorqueLayer = L.CanvasLayer.extend({
     this.provider = new this.providers[this.options.provider](options);
     this.renderer = new this.renderers[this.options.renderer](this.getCanvas(), options);
 
+    this.renderer.on("allIconsLoaded", this.render.bind(this));
+
 
     // for each tile shown on the map request the data
     this.on('tileAdded', function(t) {
-      var fixedPoint = new L.Point(t.x, t.y);
-      this._adjustTilePoint(fixedPoint);
-      t.corrected = {};
-      t.corrected.x = fixedPoint.x;
-      t.corrected.y = fixedPoint.y;
       var tileData = this.provider.getTileData(t, t.zoom, function(tileData) {
         // don't load tiles that are not being shown
         if (t.zoom !== self._map.getZoom()) return;
@@ -2415,39 +2428,6 @@ L.TorqueLayer = L.CanvasLayer.extend({
 
   },
 
-  _adjustTilePoint: function (tilePoint) {
-
-    var limit = this._getWrapTileNum();
-
-    // wrap tile coordinates
-    if (!this.options.continuousWorld && !this.options.noWrap) {
-      tilePoint.x = ((tilePoint.x % limit.x) + limit.x) % limit.x;
-    }
-
-    if (this.options.tms) {
-      tilePoint.y = limit.y - tilePoint.y - 1;
-    }
-  },
-
-  _getWrapTileNum: function () {
-    var crs = this._map.options.crs,
-        size = crs.getSize(this._map.getZoom());
-    return size.divideBy(this._getTileSize())._floor();
-  },
-  
-  _getTileSize: function () {
-    var map = this._map,
-        zoom = map.getZoom() + this.options.zoomOffset,
-        zoomN = this.options.maxNativeZoom,
-        tileSize = this.options.tileSize;
-
-    if (zoomN && zoom > zoomN) {
-      tileSize = Math.round(map.getZoomScale(zoom) / map.getZoomScale(zoomN) * tileSize);
-    }
-
-    return tileSize;
-  },
-
   _clearTileCaches: function() {
     var t, tile;
     for(t in this._tiles) {
@@ -2580,6 +2560,7 @@ L.TorqueLayer = L.CanvasLayer.extend({
         }
       }
     }
+    this.renderer.applyFilters();
 
     // prepare caches if the animation is not running
     // don't cache if the key has just changed, this avoids to cache
@@ -2643,6 +2624,14 @@ L.TorqueLayer = L.CanvasLayer.extend({
     var time = times.start + (times.end - times.start)*(step/this.provider.getSteps());
     return new Date(time);
   },
+  
+  timeToStep: function(timestamp) {
+    if (typeof timestamp === "Date") timestamp = timestamp.getTime();
+    if (!this.provider) return 0;
+    var times = this.provider.getKeySpan();
+    var step = (this.provider.getSteps() * (timestamp - times.start)) / (times.end - times.start);
+    return step;
+  },
 
   getStep: function() {
     return this.key;
@@ -2660,7 +2649,7 @@ L.TorqueLayer = L.CanvasLayer.extend({
    * returns an object with the start and end times
    */
   getTimeSpan: function() {
-    var times = this.provider.getKeySpan();
+    return this.provider.getKeySpan();
   },
 
   /**
@@ -2684,7 +2673,7 @@ L.TorqueLayer = L.CanvasLayer.extend({
     if (options.animationDuration) {
       this.animator.duration(options.animationDuration);
     }
-
+    this._clearCaches();
     this.redraw();
     return this;
   },
@@ -3845,6 +3834,8 @@ var Profiler = require('../profiler');
     this.options.tiler_domain = options.tiler_domain || 'cartodb.com';
     this.options.tiler_port = options.tiler_port || 80;
 
+    this.options.coordinates_data_type = this.options.coordinates_data_type || Uint8Array;
+
     if (this.options.data_aggregation) {
       this.options.cumulative = this.options.data_aggregation === 'cumulative';
     }
@@ -3870,8 +3861,8 @@ var Profiler = require('../profiler');
      */
     proccessTile: function(rows, coord, zoom) {
       var r;
-      var x = new Uint8Array(rows.length);
+      var x = new this.options.coordinates_data_type(rows.length);
-      var y = new Uint8Array(rows.length);
+      var y = new this.options.coordinates_data_type(rows.length);
 
       var prof_mem = Profiler.metric('torque.provider.windshaft.mem');
       var prof_point_count = Profiler.metric('torque.provider.windshaft.points');
@@ -3915,13 +3906,7 @@ var Profiler = require('../profiler');
       for (var r = 0; r < rows.length; ++r) {
         var row = rows[r];
         x[r] = row.x__uint8 * this.options.resolution;
-        // fix value when it's in the tile EDGE
+        y[r] = row.y__uint8 * this.options.resolution;
-        // TODO: this should be fixed in SQL query
-        if (row.y__uint8 === -1) {
-          y[r] = 0;
-        } else {
-          y[r] = row.y__uint8 * this.options.resolution;
-        }
 
         var dates = row.dates__uint16;
         var vals = row.vals__uint8;
@@ -4100,10 +4085,12 @@ var Profiler = require('../profiler');
       var self = this;
       var prof_fetch_time = Profiler.metric('torque.provider.windshaft.tile.fetch').start();
       var subdomains = this.options.subdomains || '0123';
-      var index = Math.abs(coord.corrected.x + coord.corrected.y) % subdomains.length;
+      var limit_x = Math.pow(2, zoom);
+      var corrected_x = ((coord.x % limit_x) + limit_x) % limit_x;
+      var index = Math.abs(corrected_x + coord.y) % subdomains.length;
       var url = this.templateUrl
-                .replace('{x}', coord.corrected.x)
+                .replace('{x}', corrected_x)
-                .replace('{y}', coord.corrected.y)
+                .replace('{y}', coord.y)
                 .replace('{z}', zoom)
                 .replace('{s}', subdomains[index])
 
@@ -4208,10 +4195,14 @@ var Profiler = require('../profiler');
       var host = this.options.dynamic_cdn ? this.url().replace('{s}', '0'): this._tilerHost();
       var url = host + "/api/v1/map";
       var named = this.options.named_map;
+      var allParams = {};
 
       if(named) {
         //tiles/template
         url = host + "/api/v1/map/named/" + named.name + "/jsonp";
+        if(typeof named.params !== "undefined"){
+          layergroup = named.params;
+        }
       } else {
         layergroup = {
           "version": "1.0.1",
@@ -4226,7 +4217,12 @@ var Profiler = require('../profiler');
           }]
         };
       }
-      var extra = this._extraParams(this.options.stat_tag ? { stat_tag: this.options.stat_tag }: {} );
+      
+      if(this.options.stat_tag){
+        allParams["stat_tag"] = this.options.stat_tag;
+      }
+
+      extra = this._extraParams(allParams);
 
       // tiler needs map_key instead of api_key
       // so replace it
@@ -4339,9 +4335,13 @@ var Profiler = require('../profiler');
     }
   }
 
-  function renderSprite(ctx, img) {
+  function renderSprite(ctx, img, st) {
+
     if(img.complete){
-      ctx.drawImage(img, -img.w/2, -img.h/2, img.w, img.h);
+      if (st['marker-fill-opacity'] !== undefined || st['marker-opacity'] !== undefined) {
+        ctx.globalAlpha = st['marker-fill-opacity'] || st['marker-opacity'];
+      }
+      ctx.drawImage(img, 0, 0, img.width, img.height);
     }
   }
 
@@ -4363,6 +4363,7 @@ var torque = require('../');
 var cartocss = require('./cartocss_render');
 var Profiler = require('../profiler');
 var carto = global.carto || require('carto');
+var Filters = require('./torque_filters');
 
   var TAU = Math.PI * 2;
   var DEFAULT_CARTOCSS = [
@@ -4410,9 +4411,14 @@ var carto = global.carto || require('carto');
     this._ctx = canvas.getContext('2d');
     this._sprites = []; // sprites per layer
     this._shader = null;
+    this._icons = {};
+    this._iconsToLoad = 0;
+    this._filters = new Filters(this._canvas, {canvasClass: options.canvasClass});
     this.setCartoCSS(this.options.cartocss || DEFAULT_CARTOCSS);
     this.TILE_SIZE = 256;
-    this._icons = {};
+    this._style = null;
+    this._gradients = {};
+    
     this._forcePoints = false;
   }
 
@@ -4452,6 +4458,8 @@ var carto = global.carto || require('carto');
       this._sprites = [];
       this._shader = shader;
       this._Map = this._shader.getDefault().getStyle({}, { zoom: 0 });
+      var img_names = this._shader.getImageURLs();
+      this._preloadIcons(img_names);
     },
 
     clearSpriteCache: function() {
@@ -4468,6 +4476,9 @@ var carto = global.carto || require('carto');
       var st = shader.getStyle({
         value: value
       }, shaderVars);
+      if(this._style === null || this._style !== st){
+        this._style = st;
+      }
 
       var pointSize = st['marker-width'];
       if (!pointSize) {
@@ -4479,22 +4490,29 @@ var carto = global.carto || require('carto');
       }
 
       var canvas = this._createCanvas();
-      // take into account the exterior ring to calculate the size
-      var canvasSize = (st['marker-line-width'] || 0) + pointSize*2;
       var ctx = canvas.getContext('2d');
-      var w = ctx.width = canvas.width = ctx.height = canvas.height = Math.ceil(canvasSize);
-      ctx.translate(w/2, w/2);
 
-      var img_names = this._shader.getImageURLs();
+      var markerFile = st["marker-file"] || st["point-file"];
-      this._preloadIcons(img_names);
+      var qualifiedUrl = markerFile && this._qualifyURL(markerFile);
-      if (img_names.length > 0 && this._icons.itemsToLoad === 0) {
+
-        var img_name = st["marker-file"] || st["point-file"];
+      if (qualifiedUrl && this._iconsToLoad <= 0 && this._icons[qualifiedUrl]) {
-        var img = this._icons[img_name];
+        var img = this._icons[qualifiedUrl];
-        img.w = st['marker-width'] || img.width;
+
-        img.h = st['marker-width'] || st['marker-height'];
+        var dWidth = st['marker-width'] * 2 || img.width;
-        cartocss.renderSprite(ctx, img);
+        var dHeight = (st['marker-height'] || dWidth) * (img.width / img.height);
-      } 
+
-      else {
+        canvas.width = ctx.width = dWidth;
+        canvas.height = ctx.height = dHeight;
+
+        ctx.scale(dWidth/img.width, dHeight/img.height);
+
+        cartocss.renderSprite(ctx, img, st);
+      } else {
+        // take into account the exterior ring to calculate the size
+        var canvasSize = (st['marker-line-width'] || 0) + pointSize*2;
+        var w = ctx.width = canvas.width = ctx.height = canvas.height = Math.ceil(canvasSize);
+        ctx.translate(w/2, w/2);
+
         var mt = st['marker-type'];
         if (mt && mt === 'rectangle') {
           cartocss.renderRectangle(ctx, st);
@@ -4508,13 +4526,20 @@ var carto = global.carto || require('carto');
         i.src = canvas.toDataURL();
         return i;
       }
+      
       return canvas;
     },
 
     //
     // renders all the layers (and frames for each layer) from cartocss
     //
-    renderTile: function(tile, key) {
+    renderTile: function(tile, key, callback) {
+      if (this._iconsToLoad > 0) {
+          this.on('allIconsLoaded', function() {
+              this.renderTile.apply(this, [tile, key, callback]);
+          });
+          return false;
+      }
       var prof = Profiler.metric('torque.renderer.point.renderLayers').start();
       var layers = this._shader.getLayers();
       for(var i = 0, n = layers.length; i < n; ++i ) {
@@ -4529,7 +4554,10 @@ var carto = global.carto || require('carto');
           }
         }
       }
+      
       prof.end(true);
+
+      return callback && callback(null);
     },
 
     _createCanvas: function() {
@@ -4544,6 +4572,31 @@ var carto = global.carto || require('carto');
         : new Image();
     },
 
+    _setImageSrc: function(img, url, callback) {
+      if (this.options.setImageSrc) {
+        this.options.setImageSrc(img, url, callback);
+      } else {
+        img.onload = function(){
+            callback(null);
+        };
+        img.onerror = function(){
+            callback(new Error('Could not load image'));
+        };
+        img.src = url;
+      }
+    },
+
+    _qualifyURL: function(url) {
+      if (typeof this.options.qualifyURL !== "undefined"){
+        return this.options.qualifyURL(url);
+      }
+      else{
+        var a = document.createElement('a');
+        a.href = url;
+        return a.href;
+      }
+    },
+
     //
     // renders a tile in the canvas for key defined in 
     // the torque tile
@@ -4563,6 +4616,7 @@ var carto = global.carto || require('carto');
       }
       var tileMax = this.options.resolution * (this.TILE_SIZE/this.options.resolution - 1)
       var activePixels = tile.timeCount[key];
+      var anchor = this.options.resolution/2;
       if (activePixels) {
         var pixelIndex = tile.timeIndex[key];
         for(var p = 0; p < activePixels; ++p) {
@@ -4574,13 +4628,15 @@ var carto = global.carto || require('carto');
              sp = sprites[c] = this.generateSprite(shader, c, torque.extend({ zoom: tile.z, 'frame-offset': frame_offset }, shaderVars));
            }
            if (sp) {
-             var x = tile.x[posIdx]- (sp.width >> 1);
+             var x = tile.x[posIdx]- (sp.width >> 1) + anchor;
-             var y = tileMax - tile.y[posIdx]; // flip mercator
+             var y = tileMax - tile.y[posIdx] + anchor; // flip mercator
              ctx.drawImage(sp, x, y - (sp.height >> 1));
            }
           }
         }
       }
+      
+
       prof.end(true);
     },
 
@@ -4652,37 +4708,98 @@ var carto = global.carto || require('carto');
       }
       return null;
     },
-    _preloadIcons: function(img_names){
+
+    _preloadIcons: function(img_names) {
       var self = this;
-      if (img_names.length > 0 && !this._forcePoints){
+
-        if (Object.keys(this._icons).length === 0){
+      if (img_names.length > 0 && !this._forcePoints) {
-          for (var i = 0; i<img_names.length; i++){
+
-            var new_img = this._createImage();
+        var qualifiedImageUrlSet = Object.keys(img_names.reduce(function(imgNamesMap, imgName) {
-            this._icons[img_names[i]] = null;
+            var qualifiedUrl = self._qualifyURL(imgName);
-            if (typeof self._icons.itemsToLoad === 'undefined'){
+            if (!self._icons[qualifiedUrl]) {
-              this._icons.itemsToLoad = img_names.length;
+                imgNamesMap[qualifiedUrl] = true;
             }
-            new_img.onload = function(e){
+            return imgNamesMap;
-              self._icons[this.src] = this;
+        }, {}));
-              if (Object.keys(self._icons).length === img_names.length + 1){
+
-                self._icons.itemsToLoad--;
+        var filtered = self._shader.getLayers().some(function(layer) {
-                if (self._icons.itemsToLoad === 0){
+          return typeof layer.shader["image-filters"] !== "undefined";
-                  self.clearSpriteCache();
+        });
-                  self.fire("allIconsLoaded");
+
-                }
+        this._iconsToLoad += qualifiedImageUrlSet.length;
-              }
+
-            };
+        qualifiedImageUrlSet.forEach(function(qualifiedImageUrl) {
-            new_img.onerror = function(){
+          self._icons[qualifiedImageUrl] = null;
+
+          var img = self._createImage();
+
+          if (filtered) {
+            img.crossOrigin = 'Anonymous';
+          }
+
+          self._setImageSrc(img, qualifiedImageUrl, function(err) {
+            if (err) {
               self._forcePoints = true;
               self.clearSpriteCache();
-              console.error("Couldn't get marker-file " + this.src);
+              self._iconsToLoad = 0;
-            };
+              self.fire("allIconsLoaded");
-            new_img.src = img_names[i];
+              if(filtered) {
-          }
+                console.info("Only CORS-enabled, or same domain image-files can be used in combination with image-filters");
-          
+              }
-        }
+              console.error("Couldn't get marker-file " + qualifiedImageUrl);
-      }
+            } else {
+              self._icons[qualifiedImageUrl] = img;
+              self._iconsToLoad--;
 
+              if (self._iconsToLoad <= 0){
+                self.clearSpriteCache();
+                self.fire("allIconsLoaded");
+              }
+            }
+          });
+        });
+      } else {
+          this.fire("allIconsLoaded");
+      }
+  },
+
+  applyFilters: function(){
+    if(this._style){
+      if(this._style['image-filters']){
+        function gradientKey(imf){
+          var hash = ""
+          for(var i = 0; i < imf.args.length; i++){
+            var rgb = imf.args[i].rgb;
+            hash += rgb[0] + ":" + rgb[1] + ":" + rgb[2];
+          }
+          return hash;
+        }
+        var gradient = this._gradients[gradientKey(this._style['image-filters'])];
+        if(!gradient){
+          function componentToHex(c) {
+            var hex = c.toString(16);
+            return hex.length == 1 ? "0" + hex : hex;
+          }
+
+          function rgbToHex(r, g, b) {
+            return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
+          }
+          gradient = {};
+          var colorize = this._style['image-filters'].args;
+          
+          var increment = 1/colorize.length;
+          for (var i = 0; i < colorize.length; i++){
+            var key = increment * i + increment;
+            var rgb = colorize[i].rgb;
+            var formattedColor = rgbToHex(rgb[0], rgb[1], rgb[2]);
+            gradient[key] = formattedColor;
+          }
+          this._gradients[gradientKey(this._style['image-filters'])] = gradient;
+        }
+        this._filters.gradient(gradient);
+        this._filters.draw();
+      }
+    }
   }
 });
 
@@ -4691,7 +4808,7 @@ var carto = global.carto || require('carto');
 module.exports = PointRenderer;
 
 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"../":10,"../profiler":17,"./cartocss_render":22,"carto":undefined}],25:[function(require,module,exports){
+},{"../":10,"../profiler":17,"./cartocss_render":22,"./torque_filters":26,"carto":undefined}],25:[function(require,module,exports){
 (function (global){
 var carto = global.carto || require('carto');
 
@@ -4804,7 +4921,7 @@ var carto = global.carto || require('carto');
     // renders a tile in the canvas for key defined in 
     // the torque tile
     //
-    renderTile: function(tile, key, px, py) {
+    renderTile: function(tile, key, callback) {
       if(!this._canvas) return;
 
       var res = this.options.resolution;
@@ -4846,6 +4963,7 @@ var carto = global.carto || require('carto');
         //ctx.putImageData(imageData, 0, 0);
       }
       //prof.end();
+      return callback && callback(null);
     }
   };
 
@@ -4855,6 +4973,98 @@ module.exports = RectanbleRenderer;
 
 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 },{"carto":undefined}],26:[function(require,module,exports){
+/*
+ Based on simpleheat, a tiny JavaScript library for drawing heatmaps with Canvas, 
+ by Vladimir Agafonkin
+ https://github.com/mourner/simpleheat
+*/
+
+'use strict';
+
+function torque_filters(canvas, options) {
+    // jshint newcap: false, validthis: true
+    if (!(this instanceof torque_filters)) { return new torque_filters(canvas, options); }
+
+    options = options || {};
+
+    this._canvas = canvas = typeof canvas === 'string' ? document.getElementById(canvas) : canvas;
+
+    this._ctx = canvas.getContext('2d');
+    this._width = canvas.width;
+    this._height = canvas.height;
+
+    this._max = 1;
+    this._data = [];
+
+    this.canvasClass = options.canvasClass;
+}
+
+torque_filters.prototype = {
+
+    defaultGradient: {
+        0.4: 'blue',
+        0.6: 'cyan',
+        0.7: 'lime',
+        0.8: 'yellow',
+        1.0: 'red'
+    },
+
+    gradient: function (grad) {
+        // create a 256x1 gradient that we'll use to turn a grayscale heatmap into a colored one
+        var canvas = this._createCanvas(),
+            ctx = canvas.getContext('2d'),
+            gradient = ctx.createLinearGradient(0, 0, 0, 256);
+
+        canvas.width = 1;
+        canvas.height = 256;
+
+        for (var i in grad) {
+            gradient.addColorStop(+i, grad[i]);
+        }
+
+        ctx.fillStyle = gradient;
+        ctx.fillRect(0, 0, 1, 256);
+
+        this._grad = ctx.getImageData(0, 0, 1, 256).data;
+
+        return this;
+    },
+
+    draw: function () {
+        if (!this._grad) {
+            this.gradient(this.defaultGradient);
+        }
+
+        var ctx = this._ctx;
+        var colored = ctx.getImageData(0, 0, this._canvas.width, this._canvas.height);
+        this._colorize(colored.data, this._grad);
+        ctx.putImageData(colored, 0, 0);
+
+        return this;
+    },
+
+    _colorize: function (pixels, gradient) {
+        for (var i = 3, len = pixels.length, j; i < len; i += 4) {
+            j = pixels[i] * 4; // get gradient color from opacity value
+
+            if (j) {
+                pixels[i - 3] = gradient[j];
+                pixels[i - 2] = gradient[j + 1];
+                pixels[i - 1] = gradient[j + 2];
+            }
+        }
+    },
+
+    _createCanvas: function() {
+        return this.canvasClass
+            ? new this.canvasClass()
+            : document.createElement('canvas');
+    }
+};
+
+module.exports = torque_filters;
+
+},{}],27:[function(require,module,exports){
 (function (global){
 var torque = require('./core');
 

doc/API.md

@@ -32,6 +32,8 @@ One of two core classes for the Torque library - it is used to create an animate
 | user      | string     | ```null```      | CartoDB account name. Found from: http://accountname.cartodb.com|
 | table     | string     | ```null```      | CartoDB table name where data is found  |
 | sql       | string     | ```null```      | SQL query to be performed to fetch the data. You must use this param or table, not at the same time |
+| cartocss  | string     | ```null```      | CartoCSS style for this map |
+| loop      | boolean    | ```true```      | If ```false```, the animation is paused when it reaches the last frame |
 
 
 ### Time methods

lib/torque/animator.js

@@ -46,6 +46,9 @@ var cancelAnimationFrame = global.cancelAnimationFrame
         this.running = true;
         requestAnimationFrame(this._tick);
         this.options.onStart && this.options.onStart();
+        if(this.options.steps === 1){
+          this.running = false;
+        }
     },
 
     isRunning: function() {
@@ -80,6 +83,7 @@ var cancelAnimationFrame = global.cancelAnimationFrame
       this.range = torque.math.linear(0, this.options.steps);
       this.rangeInv = this.range.invert();
       this.time(this._time);
+      this.start();
       return this;
     },
 
@@ -118,9 +122,12 @@ var cancelAnimationFrame = global.cancelAnimationFrame
       this._t0 = t1;
       this._time += delta;
       if(this.step() >= this.options.steps) {
-        this._time = 0;
         if(!this.options.loop){
-          this.stop();
+          // set time to max time
+          this.time(this.options.animationDuration);
+          this.pause();
+        } else {
+          this._time = 0;
         }
       }
       if(this.running) {

lib/torque/core.js

@@ -62,6 +62,7 @@
   var types = {
     Uint8Array: typeof(global['Uint8Array']) !== 'undefined' ? global.Uint8Array : Array,
     Uint32Array: typeof(global['Uint32Array']) !== 'undefined' ? global.Uint32Array : Array,
+    Int16Array: typeof(global['Int16Array']) !== 'undefined' ? global.Int16Array : Array,
     Int32Array: typeof(global['Int32Array']) !== 'undefined' ? global.Int32Array: Array
   };
 

lib/torque/gmaps/torque.js

@@ -63,7 +63,7 @@ GMapsTorqueLayer.prototype = torque.extend({},
 
   providers: {
     'sql_api': torque.providers.json,
-    'url_template': torque.providers.jsonarray,
+    'url_template': torque.providers.JsonArray,
     'windshaft': torque.providers.windshaft
   },
 
@@ -189,9 +189,10 @@ GMapsTorqueLayer.prototype = torque.extend({},
       if (tile) {
         pos = this.getTilePos(tile.coord);
         ctx.setTransform(1, 0, 0, 1, pos.x, pos.y);
-        this.renderer.renderTile(tile, this.key, pos.x, pos.y);
+        this.renderer.renderTile(tile, this.key);
       }
     }
+    this.renderer.applyFilters();
   },
 
   getActivePointsBBox: function(step) {

lib/torque/leaflet/torque.js

@@ -10,7 +10,7 @@ L.TorqueLayer = L.CanvasLayer.extend({
 
   providers: {
     'sql_api': torque.providers.json,
-    'url_template': torque.providers.jsonarray,
+    'url_template': torque.providers.JsonArray,
     'windshaft': torque.providers.windshaft
   },
 

lib/torque/provider/windshaft.js

@@ -26,6 +26,8 @@
     this.options.tiler_domain = options.tiler_domain || 'cartodb.com';
     this.options.tiler_port = options.tiler_port || 80;
 
+    this.options.coordinates_data_type = this.options.coordinates_data_type || Uint8Array;
+
     if (this.options.data_aggregation) {
       this.options.cumulative = this.options.data_aggregation === 'cumulative';
     }
@@ -51,8 +53,8 @@
      */
     proccessTile: function(rows, coord, zoom) {
       var r;
-      var x = new Uint8Array(rows.length);
+      var x = new this.options.coordinates_data_type(rows.length);
-      var y = new Uint8Array(rows.length);
+      var y = new this.options.coordinates_data_type(rows.length);
 
       var prof_mem = Profiler.metric('torque.provider.windshaft.mem');
       var prof_point_count = Profiler.metric('torque.provider.windshaft.points');
@@ -96,13 +98,7 @@
       for (var r = 0; r < rows.length; ++r) {
         var row = rows[r];
         x[r] = row.x__uint8 * this.options.resolution;
-        // fix value when it's in the tile EDGE
+        y[r] = row.y__uint8 * this.options.resolution;
-        // TODO: this should be fixed in SQL query
-        if (row.y__uint8 === -1) {
-          y[r] = 0;
-        } else {
-          y[r] = row.y__uint8 * this.options.resolution;
-        }
 
         var dates = row.dates__uint16;
         var vals = row.vals__uint8;

lib/torque/renderer/cartocss_render.js

@@ -77,7 +77,7 @@
       if (st['marker-fill-opacity'] !== undefined || st['marker-opacity'] !== undefined) {
         ctx.globalAlpha = st['marker-fill-opacity'] || st['marker-opacity'];
       }
-      ctx.drawImage(img, -img.w, -img.h, img.w*2, img.h*2);
+      ctx.drawImage(img, 0, 0, img.width, img.height);
     }
   }
 

lib/torque/renderer/point.js

@@ -2,7 +2,7 @@ var torque = require('../');
 var cartocss = require('./cartocss_render');
 var Profiler = require('../profiler');
 var carto = global.carto || require('carto');
-var filters = require('./torque_filters');
+var Filters = require('./torque_filters');
 
   var TAU = Math.PI * 2;
   var DEFAULT_CARTOCSS = [
@@ -51,7 +51,8 @@ var filters = require('./torque_filters');
     this._sprites = []; // sprites per layer
     this._shader = null;
     this._icons = {};
-    this._filters = filters(this._canvas);
+    this._iconsToLoad = 0;
+    this._filters = new Filters(this._canvas, {canvasClass: options.canvasClass});
     this.setCartoCSS(this.options.cartocss || DEFAULT_CARTOCSS);
     this.TILE_SIZE = 256;
     this._style = null;
@@ -128,20 +129,29 @@ var filters = require('./torque_filters');
       }
 
       var canvas = this._createCanvas();
-      // take into account the exterior ring to calculate the size
-      var canvasSize = (st['marker-line-width'] || 0) + pointSize*2;
       var ctx = canvas.getContext('2d');
-      var w = ctx.width = canvas.width = ctx.height = canvas.height = Math.ceil(canvasSize);
-      ctx.translate(w/2, w/2);
 
-      var img_name = this._qualifyURL(st["marker-file"] || st["point-file"]);
+      var markerFile = st["marker-file"] || st["point-file"];
-      if (img_name && this._icons.itemsToLoad <= 0) {
+      var qualifiedUrl = markerFile && this._qualifyURL(markerFile);
-          var img = this._icons[img_name];
+
-          img.w = st['marker-width'] || img.width;
+      if (qualifiedUrl && this._iconsToLoad <= 0 && this._icons[qualifiedUrl]) {
-          img.h = st['marker-width'] || st['marker-height'];
+        var img = this._icons[qualifiedUrl];
-          cartocss.renderSprite(ctx, img, st);
+
-      } 
+        var dWidth = st['marker-width'] * 2 || img.width;
-      else {
+        var dHeight = (st['marker-height'] || dWidth) * (img.width / img.height);
+
+        canvas.width = ctx.width = dWidth;
+        canvas.height = ctx.height = dHeight;
+
+        ctx.scale(dWidth/img.width, dHeight/img.height);
+
+        cartocss.renderSprite(ctx, img, st);
+      } else {
+        // take into account the exterior ring to calculate the size
+        var canvasSize = (st['marker-line-width'] || 0) + pointSize*2;
+        var w = ctx.width = canvas.width = ctx.height = canvas.height = Math.ceil(canvasSize);
+        ctx.translate(w/2, w/2);
+
         var mt = st['marker-type'];
         if (mt && mt === 'rectangle') {
           cartocss.renderRectangle(ctx, st);
@@ -162,7 +172,13 @@ var filters = require('./torque_filters');
     //
     // renders all the layers (and frames for each layer) from cartocss
     //
-    renderTile: function(tile, key) {
+    renderTile: function(tile, key, callback) {
+      if (this._iconsToLoad > 0) {
+          this.on('allIconsLoaded', function() {
+              this.renderTile.apply(this, [tile, key, callback]);
+          });
+          return false;
+      }
       var prof = Profiler.metric('torque.renderer.point.renderLayers').start();
       var layers = this._shader.getLayers();
       for(var i = 0, n = layers.length; i < n; ++i ) {
@@ -179,6 +195,8 @@ var filters = require('./torque_filters');
       }
       
       prof.end(true);
+
+      return callback && callback(null);
     },
 
     _createCanvas: function() {
@@ -192,6 +210,21 @@ var filters = require('./torque_filters');
         ? new this.options.imageClass()
         : new Image();
     },
+
+    _setImageSrc: function(img, url, callback) {
+      if (this.options.setImageSrc) {
+        this.options.setImageSrc(img, url, callback);
+      } else {
+        img.onload = function(){
+            callback(null);
+        };
+        img.onerror = function(){
+            callback(new Error('Could not load image'));
+        };
+        img.src = url;
+      }
+    },
+
     _qualifyURL: function(url) {
       if (typeof this.options.qualifyURL !== "undefined"){
         return this.options.qualifyURL(url);
@@ -222,6 +255,7 @@ var filters = require('./torque_filters');
       }
       var tileMax = this.options.resolution * (this.TILE_SIZE/this.options.resolution - 1)
       var activePixels = tile.timeCount[key];
+      var anchor = this.options.resolution/2;
       if (activePixels) {
         var pixelIndex = tile.timeIndex[key];
         for(var p = 0; p < activePixels; ++p) {
@@ -233,8 +267,8 @@ var filters = require('./torque_filters');
              sp = sprites[c] = this.generateSprite(shader, c, torque.extend({ zoom: tile.z, 'frame-offset': frame_offset }, shaderVars));
            }
            if (sp) {
-             var x = tile.x[posIdx]- (sp.width >> 1);
+             var x = tile.x[posIdx]- (sp.width >> 1) + anchor;
-             var y = tileMax - tile.y[posIdx]; // flip mercator
+             var y = tileMax - tile.y[posIdx] + anchor; // flip mercator
              ctx.drawImage(sp, x, y - (sp.height >> 1));
            }
           }
@@ -313,44 +347,61 @@ var filters = require('./torque_filters');
       }
       return null;
     },
-    _preloadIcons: function(img_names){
+
+    _preloadIcons: function(img_names) {
       var self = this;
-      this._icons = {};
+
-      if (img_names.length > 0 && !this._forcePoints){
+      if (img_names.length > 0 && !this._forcePoints) {
-        for (var i = 0; i<img_names.length; i++){
+
-          var new_img = this._createImage();
+        var qualifiedImageUrlSet = Object.keys(img_names.reduce(function(imgNamesMap, imgName) {
-          this._icons[this._qualifyURL(img_names[i])] = null;
+            var qualifiedUrl = self._qualifyURL(imgName);
-          if (typeof self._icons.itemsToLoad === 'undefined'){
+            if (!self._icons[qualifiedUrl]) {
-            this._icons.itemsToLoad = img_names.length;
+                imgNamesMap[qualifiedUrl] = true;
+            }
+            return imgNamesMap;
+        }, {}));
+
+        var filtered = self._shader.getLayers().some(function(layer) {
+          return typeof layer.shader["image-filters"] !== "undefined";
+        });
+
+        this._iconsToLoad += qualifiedImageUrlSet.length;
+
+        qualifiedImageUrlSet.forEach(function(qualifiedImageUrl) {
+          self._icons[qualifiedImageUrl] = null;
+
+          var img = self._createImage();
+
+          if (filtered) {
+            img.crossOrigin = 'Anonymous';
           }
-          var filtered = self._shader.getLayers().some(function(layer){return typeof layer.shader["image-filters"] !== "undefined"});
+
-          if (filtered){
+          self._setImageSrc(img, qualifiedImageUrl, function(err) {
-            new_img.crossOrigin = 'Anonymous';
+            if (err) {
-          }
+              self._forcePoints = true;
-          new_img.onload = function(e){
+              self.clearSpriteCache();
-            self._icons[this.src] = this;
+              self._iconsToLoad = 0;
-            if (Object.keys(self._icons).length === img_names.length + 1){
+              self.fire("allIconsLoaded");
-              self._icons.itemsToLoad--;
+              if(filtered) {
-              if (self._icons.itemsToLoad <= 0){
+                console.info("Only CORS-enabled, or same domain image-files can be used in combination with image-filters");
+              }
+              console.error("Couldn't get marker-file " + qualifiedImageUrl);
+            } else {
+              self._icons[qualifiedImageUrl] = img;
+              self._iconsToLoad--;
+
+              if (self._iconsToLoad <= 0){
                 self.clearSpriteCache();
                 self.fire("allIconsLoaded");
               }
             }
-          };
+          });
-          new_img.onerror = function(){
+        });
-            self._forcePoints = true;
+      } else {
-            self.clearSpriteCache();
+          this.fire("allIconsLoaded");
-            if(filtered){
-              console.info("Only CORS-enabled, or same domain image-files can be used in combination with image-filters");
-            }
-            console.error("Couldn't get marker-file " + this.src);
-          };
-          this.itemsToLoad++;
-          new_img.src = img_names[i];
-        }
       }
-
   },
+
   applyFilters: function(){
     if(this._style){
       if(this._style['image-filters']){

lib/torque/renderer/rectangle.js

@@ -109,7 +109,7 @@ var carto = global.carto || require('carto');
     // renders a tile in the canvas for key defined in 
     // the torque tile
     //
-    renderTile: function(tile, key, px, py) {
+    renderTile: function(tile, key, callback) {
       if(!this._canvas) return;
 
       var res = this.options.resolution;
@@ -151,6 +151,7 @@ var carto = global.carto || require('carto');
         //ctx.putImageData(imageData, 0, 0);
       }
       //prof.end();
+      return callback && callback(null);
     }
   };
 

lib/torque/renderer/torque_filters.js

@@ -6,9 +6,11 @@
 
 'use strict';
 
-function torque_filters(canvas) {
+function torque_filters(canvas, options) {
     // jshint newcap: false, validthis: true
-    if (!(this instanceof torque_filters)) { return new torque_filters(canvas); }
+    if (!(this instanceof torque_filters)) { return new torque_filters(canvas, options); }
+
+    options = options || {};
 
     this._canvas = canvas = typeof canvas === 'string' ? document.getElementById(canvas) : canvas;
 
@@ -18,6 +20,8 @@ function torque_filters(canvas) {
 
     this._max = 1;
     this._data = [];
+
+    this.canvasClass = options.canvasClass;
 }
 
 torque_filters.prototype = {
@@ -32,7 +36,7 @@ torque_filters.prototype = {
 
     gradient: function (grad) {
         // create a 256x1 gradient that we'll use to turn a grayscale heatmap into a colored one
-        var canvas = document.createElement('canvas'),
+        var canvas = this._createCanvas(),
             ctx = canvas.getContext('2d'),
             gradient = ctx.createLinearGradient(0, 0, 0, 256);
 
@@ -40,7 +44,7 @@ torque_filters.prototype = {
         canvas.height = 256;
 
         for (var i in grad) {
-            gradient.addColorStop(i, grad[i]);
+            gradient.addColorStop(+i, grad[i]);
         }
 
         ctx.fillStyle = gradient;
@@ -74,6 +78,12 @@ torque_filters.prototype = {
                 pixels[i - 1] = gradient[j + 2];
             }
         }
+    },
+
+    _createCanvas: function() {
+        return this.canvasClass
+            ? new this.canvasClass()
+            : document.createElement('canvas');
     }
 };
 

package.json

@@ -1,6 +1,6 @@
 {
     "name": "torque.js",
-    "version": "2.10.0",
+    "version": "2.11.1",
     "description": "Torque javascript library",
     "repository": {
         "type": "git",
@@ -29,13 +29,18 @@
     },
     "devDependencies": {
       "leaflet": "0.7.3",
+      "underscore": "^1.6.0",
       "node-qunit-phantomjs": "^1.0.0",
       "browserify": "^7.0.0",
+      "mapnik": "https://github.com/CartoDB/node-mapnik/tarball/1.4.15-cdb1",
+      "canvas": "~1.2.1",
+      "request": "^2.53.0",
+      "qunit": "~0.7.5",
       "qunitjs": "1.x",
       "uglify-js": "1.3.3"
     },
     "scripts": {
-        "test": "make prepare-test-suite && ./node_modules/node-qunit-phantomjs/bin/node-qunit-phantomjs test/suite.html"
+        "test": "make test-all"
     },
     "main": "./lib/torque/index.js"
 }

test/acceptance/example.js

@@ -0,0 +1,22 @@
+var Canvas = require('canvas');
+var image = require('../support/image');
+
+QUnit.module('example');
+
+test('reference test with canvas', function() {
+    var circleRadius = 20;
+    var canvasSize = circleRadius * 2 + 2;
+    var canvas = new Canvas(canvasSize, canvasSize);
+
+    var ctx = canvas.getContext('2d');
+
+    ctx.beginPath();
+    ctx.arc(circleRadius + 1, circleRadius + 1, circleRadius, 0, Math.PI * 2, true);
+    ctx.closePath();
+    ctx.fill();
+
+    var imageDiff = image.compare(canvas.toBuffer(), 'canvas_basic_reference.png');
+
+    equal(imageDiff, 0);
+});
+

test/acceptance/renderer/point.js

@@ -0,0 +1,66 @@
+var pointRenderer = require('../../support/point_renderer');
+var image = require('../../support/image');
+
+QUnit.module('renderer/point');
+
+var IMAGE_DIFF_TOLERANCE = 4 / 100;
+
+asyncTest('navy example', function(assert) {
+    var cartocss = [
+        'Map {',
+        '  -torque-time-attribute: "date";',
+        '  -torque-aggregation-function: "count(cartodb_id)";',
+        '  -torque-frame-count: 760;',
+        '  -torque-animation-duration: 15;',
+        '  -torque-resolution: 2',
+        '}',
+        '#layer {',
+        '  marker-width: 3;',
+        '  marker-fill-opacity: 0.8;',
+        '  marker-fill: #FEE391; ',
+        '  comp-op: "lighten";',
+        '  [value > 2] { marker-fill: #FEC44F; }',
+        '  [value > 3] { marker-fill: #FE9929; }',
+        '  [value > 4] { marker-fill: #EC7014; }',
+        '  [value > 5] { marker-fill: #CC4C02; }',
+        '  [value > 6] { marker-fill: #993404; }',
+        '  [value > 7] { marker-fill: #662506; }',
+        '  [frame-offset = 1] { marker-width: 10; marker-fill-opacity: 0.05;}',
+        '  [frame-offset = 2] { marker-width: 15; marker-fill-opacity: 0.02;}',
+        '}'
+    ].join('\n');
+
+    var step = 300;
+
+    pointRenderer.getTile('default_navy_3-3-2.torque.json', cartocss, 3, 3, 2, step, function(err, canvas) {
+        assert.ok(!err, 'no error while getting tile');
+        var imageDiff = image.compare(canvas.toBuffer(), 'default_navy_3-3-2.png');
+        assert.ok(imageDiff < IMAGE_DIFF_TOLERANCE, 'navy tile is ok');
+        QUnit.start();
+    });
+});
+
+asyncTest('basic heatmap', function(assert) {
+    var cartocss = [
+        'Map {',
+        '  -torque-time-attribute: "date";',
+        '  -torque-aggregation-function: "count(cartodb_id)";',
+        '  -torque-frame-count: 1;',
+        '  -torque-resolution: 1',
+        '}',
+        '#layer {',
+        '  marker-width: 4;',
+        '  image-filters: colorize-alpha(blue, cyan, lightgreen, yellow , orange, red);',
+        '  marker-file: url(http://s3.amazonaws.com/com.cartodb.assets.static/alphamarker.png);',
+        '}'
+    ].join('\n');
+
+    var step = 0;
+
+    pointRenderer.getTile('heatmap_navy_3-2-3.torque.json', cartocss, 3, 2, 3, step, function(err, canvas) {
+        assert.ok(!err, 'no error while getting tile');
+        var imageDiff = image.compare(canvas.toBuffer(), 'heatmap_navy_3-2-3.png');
+        assert.ok(imageDiff < IMAGE_DIFF_TOLERANCE, 'heatmap tile is ok');
+        QUnit.start();
+    });
+});

test/results/.gitignore

@@ -0,0 +1 @@
+*.png

test/support/image.js

@@ -0,0 +1,19 @@
+var mapnik = require('mapnik');
+
+function compare(buffer, fixtureRelPath) {
+    save(__dirname + '/../results/' + fixtureRelPath, buffer);
+
+    var img = new mapnik.Image.fromBytesSync(buffer);
+    var reference = new mapnik.Image.openSync(__dirname + '/../fixtures/image/' + fixtureRelPath);
+    return img.compare(reference) / (reference.width() * reference.height());
+}
+
+function save(path, buffer) {
+    var img = new mapnik.Image.fromBytesSync(buffer);
+    img.save(path);
+}
+
+module.exports = {
+    compare: compare,
+    save: save
+};

test/support/point_renderer.js

@@ -0,0 +1,59 @@
+var Canvas = require('canvas');
+var request = require('request');
+var _ = require('underscore');
+var fs = require('fs');
+
+var torque = require('../../lib/torque/index');
+
+
+function getTile(jsonRelPath, cartocss, z, x, y, step, callback) {
+    step = step || 0;
+
+    var cartoCssOptions = torque.common.TorqueLayer.optionsFromCartoCSS(cartocss);
+
+    var provider = new torque.providers.windshaft(_.extend({ no_fetch_map: true }, cartoCssOptions));
+    var rendererOptions = _.extend({cartocss: cartocss}, cartoCssOptions, {
+        canvasClass: Canvas,
+        imageClass: Canvas.Image,
+        setImageSrc: function(img, url, callback) {
+            var requestOpts = {
+                url: url,
+                method: 'GET',
+                encoding: null
+            };
+            request(requestOpts, function (err, response, body) {
+                if (!err && response.statusCode === 200) {
+                    img.onload = function() {
+                        callback(null);
+                    };
+                    img.onerror = function() {
+                        callback(new Error('Could not load marker-file image: ' + url));
+                    };
+                    img.src = body;
+                } else {
+                    callback(new Error('Could not load marker-file image: ' + url));
+                }
+            });
+        },
+        qualifyURL: function(url) {
+            return url;
+        }
+    });
+
+    var rows = JSON.parse(fs.readFileSync(__dirname + '/../fixtures/json/' + jsonRelPath));
+
+    var canvas = new Canvas(256, 256);
+    var pointRenderer = new torque.renderer.Point(canvas, rendererOptions);
+
+    pointRenderer.renderTile(provider.proccessTile(rows, {x: x, y: y}, z), step, function(err) {
+        if (err) {
+            return callback(err, null);
+        }
+        pointRenderer.applyFilters();
+        return callback(null, canvas);
+    });
+}
+
+module.exports = {
+    getTile: getTile
+};