void addFirework(double x, double y)
{
int seed = (int)DateTime.Now.Ticks;
for (int i = 0; i < FIREWORK_NUM; i++)
{
seed += (int)DateTime.Now.Ticks;
Random r = new Random(seed);
double size = SIZE_MIN + (SIZE_MAX - SIZE_MIN) * r.NextDouble();
byte red = (byte)(128 + (128 * r.NextDouble()));
byte green = (byte)(128 + (128 * r.NextDouble()));
byte blue = (byte)(128 + (128 * r.NextDouble()));
double xVelocity = X_VELOCITY - 2 * X_VELOCITY * r.NextDouble();
double yVelocity = -Y_VELOCITY *r.NextDouble();
MagicDot dot = new MagicDot(red, green, blue, size);
dot.X = x;
dot.Y = y;
dot.XVelocity = xVelocity;
dot.YVelocity = yVelocity;
dot.Gravity = GRAVITY;
dot.RunFirework();
_fireworks.Add(dot);
LayoutRoot.Children.Add(dot);
}
}
/////////////////////////////////////////////////////
// Private Methods
/////////////////////////////////////////////////////
void moveFirework()
{
for (int i = _fireworks.Count - 1; i >= 0; i--)
{
MagicDot dot = _fireworks[i];
dot.RunFirework();
if (dot.Opacity <= 0.1)
{
LayoutRoot.Children.Remove(dot);
_fireworks.Remove(dot);
}
}
}
