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A drag-to-reveal menu that allow user to drag at somewhere and see a menu show up. The drag menu will stick at the point that user dragged, configurable if you want it's center to stick at a point.
As a League of Legends lover, I made an example to show that how i customize it and make it like the radial ping menu in League of Legends. Thinking to add ping sound and notification for user lol
In addition, I also wrote some code to show that how to restrict a pointer view within a radius. It may suitable for making a virtual D-Pad or something.