protected override void Update(GameTime gameTime)
{
KeyMouseReader.Update();
if (KeyMouseReader.KeyClick(Keys.Escape))
{
Exit();
}
//Calculate delta and multiply it with 2.2.
float delta = (float)gameTime.ElapsedGameTime.TotalSeconds;
delta *= 2.2f;
//Update the simulation world.
world.Update(delta);
base.Update(gameTime);
}