Implemented PNG export

sources/scripts/render.js

@@ -0,0 +1,27 @@
+function Render()
+{
+  this.el = document.createElement("canvas"); this.el.id = "render";
+  this.img = document.createElement("img");
+
+  this.el.width = 300; this.el.height = 300;
+
+  this.draw = function()
+  {
+    var xml = new XMLSerializer().serializeToString(dotgrid.svg_el);
+    var svg64 = btoa(xml);
+    var b64Start = 'data:image/svg+xml;base64,';
+    var image64 = b64Start + svg64;
+    this.img.src = image64;
+    this.el.getContext('2d').clearRect(0, 0, 300, 300);
+    this.el.getContext('2d').drawImage(this.img, 0, 0);
+  }
+
+  this.buffer = function()
+  {
+    var fs = require('fs');
+    var data = this.el.toDataURL('image/png').replace(/^data:image\/\w+;base64,/, "");
+    var buf = new Buffer(data, 'base64');
+
+    return buf
+  }
+}