What is the fastest way to draw a circle ?

[Vladimir]

Here is something to play with. Some parts of the code are commented and uncommenting some of them might change the behavior a bit.

The most important part is the one that makes sure the animation is "lag-undependent" - items will move properly regardless of the number of frames the hardware can handle.

Thanks ! GL version gives 25fps for me. In my case position calculation is more complicated: each frame is calculated in separate thread and calculation sometimes can be long. However frame time is adjustable so I'll try to follow your ideas and adjust it when rendering takes more time than calculations.