title: How easy is it to write a Flash app and what tools are needed?
body: <p>I have been wanting to learn to write a Flash app so that it can be embedded inside a webpage.</p>
  
  <p>But is it hard to write one, say, just to show a circle bouncing around the walls of the 4 sides of the Flash window (no gravity, but just like the dot in the game "Pong"), and what tools are needed (and are they free?).</p>
  
  <p>P.S. Then after that, I would like to add that I can catch the circle with the mouse, or pick up the circle and let it drop like there is gravity and let it bounce around.  So I think probably a programming language is the best.</p>
  
  <p>Thanks very much.</p>