I'm wondering what exact steps you would recommend if I want to make a Shape over a Piece blink for a few seconds.
What I can already do:
-Properly compile and add a decorator custom Java class to a Piece
-Access the Map in which this visual effect should happen
-Produce a proper Shape that has the position, size and orientation of the Piece
-Draw that shape with a transparent shade
What I can't do yet:
-Start some kind of Thread or Executorservice that will draw that shape on and off for n times, and get acceptable levels of fluidity.