added image-src.js example

draw the canvas intself back via drawImage()

examples/image-src.js

@@ -0,0 +1,40 @@
+
+/**
+ * Module dependencies.
+ */
+
+var Canvas = require('../lib/canvas')
+  , Image = Canvas.Image
+  , canvas = new Canvas(200, 200)
+  , ctx = canvas.getContext('2d')
+  , fs = require('fs');
+
+ctx.fillRect(0,0,150,150);  
+ctx.save();                 
+                            
+ctx.fillStyle = '#09F'      
+ctx.fillRect(15,15,120,120);
+                            
+ctx.save();                 
+ctx.fillStyle = '#FFF'      
+ctx.globalAlpha = 0.5;      
+ctx.fillRect(30,30,90,90);  
+                            
+ctx.restore();              
+ctx.fillRect(45,45,60,60);  
+                            
+ctx.restore();              
+ctx.fillRect(60,60,30,30);  
+
+var img = new Image;
+img.src = canvas.toBuffer();
+ctx.drawImage(img, 0, 0, 50, 50);
+ctx.drawImage(img, 50, 0, 50, 50);
+ctx.drawImage(img, 100, 0, 50, 50);
+
+var out = fs.createWriteStream(__dirname + '/image-src.png')
+  , stream = canvas.createPNGStream();
+
+stream.on('data', function(chunk){
+  out.write(chunk);
+});