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Jun 13th, 2012
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  1. var jsdom = require("jsdom"),
  2. jq = require('jquery'),
  3. fs = require('fs'),
  4. canvas = require('canvas');
  5.  
  6. exports.bg = function(req, res) {
  7. var document = jsdom.jsdom(),
  8. window = document.createWindow(),
  9. jQuery = jq.create(window),
  10. script = document.createElement("script");
  11.  
  12. window.Canvas = canvas;
  13. script.src = 'file://' + __dirname + '/public/javascripts/jquery.flot.js';
  14. script.onload = function ()
  15. {
  16. var i, d1 = [], d2 = [], d3 = [];
  17. for (i = 10; --i;) d1.push([i, parseInt(Math.random() * 30)]);
  18. for (i = 10; --i;) d2.push([i, parseInt(Math.random() * 30)]);
  19. for (i = 10; --i;) d3.push([i, parseInt(Math.random() * 30)]);
  20.  
  21. var defaults = {
  22. lines: { show: true, fill: true, steps: false },
  23. bars: { show: false, barWidth: 0.6 }
  24. };
  25.  
  26. var data = [
  27. jQuery.extend(true, {}, defaults, {data: d1}),
  28. jQuery.extend(true, {}, defaults, {data: d2}),
  29. jQuery.extend(true, {}, defaults, {data: d3})
  30. ];
  31.  
  32. var options = {
  33. width: 600, height: 300,
  34. grid: {clickable: true, hoverable: true}
  35. };
  36.  
  37. var placeholder = jQuery(''), // empty jQuery object
  38. plot = jQuery.plot(placeholder, data, options),
  39. node_canvas = plot.getCanvas(),
  40. ctx = node_canvas.getContext('2d');
  41.  
  42. node_canvas.toBuffer(function(err, buf){
  43. res.send(buf, { 'Content-Type': 'image/png' });
  44. });
  45. };
  46. document.head.appendChild(script);
  47. };
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