   XNA2D negative to Positive values
  ok this may have a rediculous ans that im missing :P but ....if i define a Varible as GameBall.Velocity = (-GameBall.Velocity);how would you reverse this? (e.g)GameBall.Velocity = (+GameBall.Velocity); //i know this doesnt work but it Illustrates what im trying to do
  Take a look at Math.Abs()Cheers,Mark   ;  Or go back to simple algebra and multiply by -1.   ;  Nice thank you :) its also worked just doing the same thing GameBall.Velocity = (-GameBall.Velocity); on an already  -GameBall.Velocity just made it pos ofc :P