Is there a way to configure the controls as in many games? I mean something like that circle that you see in the lower left corner on various games where you just have to move your finger without lifting it from the screen
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Yes, search this forum for "virtual joystick" or "virtual gamepad" or "thumbstick", there are lots of examples. Here is one I made for another post:
dropbox.com/s/7p6fgru06zrzvpj/Thumbstick8Direction2.capx