text example using streaming api

examples/text.js

@@ -5,7 +5,8 @@
 
 var Canvas = require('../lib/canvas')
   , canvas = new Canvas(200, 200)
-  , ctx = canvas.getContext('2d');
+  , ctx = canvas.getContext('2d')
+  , fs = require('fs');
 
 ctx.globalAlpha = .2;
 
@@ -32,4 +33,9 @@ ctx.strokeText("Wahoo", 50, 100);
 ctx.fillStyle = '#000';
 ctx.fillText("Wahoo", 49, 99);
 
-canvas.savePNG(__dirname + '/text.png');
+var out = fs.createWriteStream(__dirname + '/text.png')
+  , stream = canvas.createPNGStream();
+
+stream.on('data', function(chunk){
+  out.write(chunk);
+});

lib/canvas.js

@@ -15,7 +15,8 @@ var canvas = require('../build/default/canvas')
   , Context2d = canvas.CanvasRenderingContext2d
   , CanvasGradient = canvas.CanvasGradient
   , cairoVersion = canvas.cairoVersion
-  , PNGStream = require('./pngstream');
+  , PNGStream = require('./pngstream')
+  , fs = require('fs');
 
 /**
  * Export `Canvas` as the module.

lib/pngstream.js

@@ -41,7 +41,8 @@ var PNGStream = module.exports = function PNGStream(canvas, sync) {
       : 'streamPNG';
   this.sync = sync;
   this.canvas = canvas;
-  if ('streamPNG' == method) throw new Error('async png streaming not yet implemented');
+  // TODO: implement async
+  if ('streamPNG' == method) method = 'streamPNGSync';
   process.nextTick(function(){
     canvas[method](function(err, chunk, len){
       if (err) {