title: Are there any JS touch-screen controller library?
body: <p>I made a little canvas game. If the user has a desktop browser, then he can control the character by pressing the arrowkeys. But if he has a tablet or mobile, then arrowkeys aren't available.</p>
  
  <p>I saw somewhere a controller, which looks like a joystick from the top view. Are there any library for this, or I have to write it myself?</p>
  
  <p>Thanks in advance,</p>