Make an image of text

gistfile1.txt

// a node.js method for creating images of text
// as used in https://twitter.com/nytanon and https://twitter.com/wapoanon

function makeImage(object, que, callback) {

  var text = object.text;

  var Canvas = require('canvas'),
    Image = Canvas.Image,
    canvas = new Canvas(200, 200),
    context = canvas.getContext('2d');

  var fs = require('fs'),
    out = fs.createWriteStream('/tmp/' + object.id + '.png'),
    stream = canvas.pngStream();

  stream.on('data', function(chunk) {
    out.write(chunk);
  });

  stream.on('end', function() {
    setTimeout(function() {
    
      tweet(object, que, callback);
      // and don't forget to delete the image from /tmp after you tweet.
      
    }, 500);
  });


  context.font = '24px Georgia';

  var maxWidth = 600;
  var lineHeight = 30;
  var xMargin = 10;

  var x = xMargin;
  var y = lineHeight;
  var text = object.snippet;

  var lines = 0;
  var width = 0;
  var height = lineHeight;


  var words = text.split(' ');
  var line = '';


  // calculate
  for (var n = 0; n < words.length; n++) {
    var testLine = line + words[n] + ' ';
    var metrics = context.measureText(testLine);
    var testWidth = metrics.width;
    if (testWidth > maxWidth && n > 0) {
      line = words[n] + ' ';
      height += lineHeight;
      lines++;
    } else {
      width = Math.max(width, testWidth);
      line = testLine;
    }
    if (n + 1 == words.length) {

      var words = text.split(' ');
      x = xMargin;
      y = lineHeight;
      line = '';

      // Calculate canvas size, add margin
      context.canvas.width = xMargin * 2 + width;
      context.canvas.height = height + xMargin;

      context.fillStyle = "white";
      context.fillRect(0, 0, context.canvas.width, context.canvas.height);

      context.font = '24px Georgia';
      context.fillStyle = "black";

      // render
      for (var i = 0; i < words.length; i++) {
        rTestLine = line + words[i] + ' ';
        var metrics = context.measureText(rTestLine);
        var testWidth = metrics.width;
        if (testWidth > maxWidth && i > 0) {
          context.fillText(line, x, y);
          line = words[i] + ' ';
          y += lineHeight;
        } else {
          line = rTestLine;
        }
        if (i + 1 == words.length) {
          context.fillText(line, x, y);
        }
      }

    }
  }

  canvas.pngStream();
}