Create a rotary control and calculate the rotation speed

Tutorials concerning the OpenGL® ES cross-platform API for full-function 2D and 3D graphics on the Google-Android platform.

Create a rotary control and calculate the rotation speed

Postby 3m3r1c » Thu Oct 28, 2010 1:24 pm

Hi,
I want create a knob rotary control where the user have to do a rotary gesture to using it.
I want to calculate the speed rotation of the knob and also is only possible turn it in unique sens.
I drew a picture to show you

Image

Somebody have any idea how to do that in 2D with surface view ?
3m3r1c
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