Python Arcade provides a simple three event loop to build off.

:py:func:`on_draw`

is provided to render to the window. After the on_draw event the window will present itself to the screen. By default this attempts to occur every 1/60 seconds or around 16.7 milliseconds. This can be changed when initialising your :py:class:`arcade.Window` with the draw_rate argument. Setting the draw rate to a value above a screens refresh rate can cause tearing unless the vsync argument is set to true. It is recommended to keep your draw_rate around the refresh rate of the screen as it does not prevent the other events from occuring.

:py:func:`on_update`

is provided to update state which needs to happen at a roughly regular interval. The update event is not strictly paired to the draw event, but they share the same thread. This can cause a bottle-neck if one is significantly slower than the other. The event also provides a delta_time argument which is the time elapsed since the last on_update event.

:py:func:`on_fixed_update`

is provided to update state which must happen with an exactly regular interval.

TODO: add note about camera state resetting once that's in

All three methods are exposed to be overridden in :py:class:`arcade.Window` and :py:class:`arcade.View`. You may also register your own handlers to these events using :py:func:`arcade.Window.push_handlers`, but this is not recommended for beginners.