New answers tagged html5
Node.js & the event loop : To prevent flooding the action queue by multiple users playing the same game, I would divide the MMO into game rooms or game regions / zones. Dividing the game server into independent threads that could even run on independent machines. A login socket server for handling new incoming clients with a db reader & writer ...
context.clearRect() has a method signature of: context.clearRect(x, y, width, height) In your code, however, you are passing the height and width in the incorrect positions. Changing your call to context.clearRect(0, 0, canvas.width, canvas.height) fixes the issue. MDN clearRect() documentation.
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