Another whiteboard

Codeproject.com has some whiteboard projects to look at. An html5 canvas based whiteboard looked interesting. Besides the code, the author also helped by documenting a bit about how it works. Screenshots were included. They show the drawing board and a chat message box for text conversations. Drawing functionality included making a line, erasing, and clearing the entire space. The writeup also describes that he decided against polling to update the server due to scalability and user experience issues. He mentions the terms HTTP Push or Comet as alternatives, but he picked the WebSocket feature of HTML 5 for ease of implementation. However, his code still needed to "chunk" the message data into pieces small enough to transfer via the socket.