private void SetConstraints(Ellipse ball, PhysicsInfo info)
{
Size bounds = _container.RenderSize;
if (info.X <= 0)
{
info.X = 0;
info.AX *= -1 * Damping;
}
else if (info.X >= bounds.Width - ball.Width)
{
info.X = bounds.Width - ball.Width;
info.AX *= -1 * Damping;
}
if (info.Y <= 0)
{
info.Y = 0;
info.AY *= -1 * Damping;
}
else if (info.Y >= bounds.Height - ball.Height)
{
info.Y = bounds.Height - ball.Height;
info.AY *= -1 * Damping;
}
}
private void Randomize(object sender, RoutedEventArgs e)
{
for (int i = 0; i < TotalBalls; i++)
{
PhysicsInfo info = InitPhysicsForBall();
(_container.Children[i] as Ellipse).Tag = info;
}
}
private void UpdateBall(PhysicsInfo info)
{
info.AX *= Resistance;
info.AY += Gravity;
info.AY *= Resistance;
info.X += info.AX;
info.Y += info.AY;
}
private void CreateBalls()
{
for (int i = 0; i < TotalBalls; i++)
{
Ellipse e = new Ellipse();
e.Width = 20;
e.Height = 20;
_container.Children.Add(e);
PhysicsInfo info = InitPhysicsForBall();
e.Tag = info;
}
}
void CompositionTarget_Rendering(object sender, EventArgs e)
{
for (int i = 0; i < TotalBalls; i++)
{
Ellipse ball = _container.Children[i] as Ellipse;
PhysicsInfo info = ball.Tag as PhysicsInfo;
UpdateBall(info);
SetConstraints(ball, info);
ball.SetValue(Canvas.LeftProperty, info.X);
ball.SetValue(Canvas.TopProperty, info.Y);
}
}