/**
* Add a fake sparkle from a mouse interaction.
*/
public void AddSparkleFromMouse(Point start, Point end, DateTime startTime)
{
if (Math.Abs(start.X - end.X) <= 5 && Math.Abs(start.Y - end.Y) <= 5)
{
// only generate moving sparkles
return;
}
MovingSparkle sparkle = new MovingSparkle();
sparkle.SetSparkle(15, 25, 1);
sparkle.SetMovement(start.X, start.Y, (end.X - start.X) * 2.0, (end.Y - start.Y) * 2.0, startTime);
canvas.Children.Add(sparkle.Image);
sparkles.AddLast(sparkle);
sparkle.Update(startTime);
}
/**
* Update the position and size of all sparkles.
* Remove sparkles that leave the canvas.
*/
public void Update(DateTime now)
{
LinkedListNode <MovingSparkle> node = sparkles.First;
while (node != null)
{
// update sparkle
MovingSparkle sparkle = node.Value;
sparkle.Update(now);
// remove sparkle if outside the canvas
double left = Canvas.GetLeft(sparkle.Image);
double top = Canvas.GetTop(sparkle.Image);
if (left + sparkle.Image.Width < 0 || left > canvas.ActualWidth ||
top + sparkle.Image.Height < 0 || top > canvas.ActualHeight)
{
LinkedListNode <MovingSparkle> next = node.Next;
canvas.Children.Remove(sparkle.Image);
sparkles.Remove(node);
node = next;
continue;
}
node = node.Next;
}
}