Returns the total number of frames recorded by calls to frameStarted(). This can be used when clients want to perform an action every N frames, such a

Called when a ball collides with a Body in this element. The default implementation does nothing (allowing objects to bounce off each other normally).

Returns true if there are active elements in motion. Returns false if there are no active elements, indicating that tick() can be called with larger t

Returns a list of the high score stored in SharedPreferences. Always returns a nonempty list, which will be [0] if no high scores have been stored.

Returns true if the flipper should be activated by a left flipper button.

Returns true if the flipper should be activated by a right flipper button.

Makes all targets visible by calling Body.setActive(true) on each target body

Parses the string argument as a JSON object and converts to a Map.