Bar graph added.

node_modules/canvas/lib/jpegstream.js

@@ -0,0 +1,45 @@
+'use strict';
+
+/*!
+ * Canvas - JPEGStream
+ * Copyright (c) 2010 LearnBoost <tj@learnboost.com>
+ * MIT Licensed
+ */
+
+var Readable = require('stream').Readable;
+var util = require('util');
+
+var JPEGStream = module.exports = function JPEGStream(canvas, options) {
+  if (!(this instanceof JPEGStream)) {
+    throw new TypeError("Class constructors cannot be invoked without 'new'");
+  }
+
+  if (canvas.streamJPEGSync === undefined) {
+    throw new Error("node-canvas was built without JPEG support.");
+  }
+
+  Readable.call(this);
+
+  this.options = options;
+  this.canvas = canvas;
+};
+
+util.inherits(JPEGStream, Readable);
+
+function noop() {}
+
+JPEGStream.prototype._read = function _read() {
+  // For now we're not controlling the c++ code's data emission, so we only
+  // call canvas.streamJPEGSync once and let it emit data at will.
+  this._read = noop;
+  var self = this;
+  self.canvas.streamJPEGSync(this.options, function(err, chunk){
+    if (err) {
+      self.emit('error', err);
+    } else if (chunk) {
+      self.push(chunk);
+    } else {
+      self.push(null);
+    }
+  });
+};