public Trail(Vector from, Vector to, double speed, Color color1, Color color2)
{
var trailVector = (to - from).Normalized() * TRAIL_SIZE;
color1.A = 0;
var brush = new LinearGradientBrush(color1, color2, from.ToPoint(), to.ToPoint());
brush.MappingMode = BrushMappingMode.Absolute;
var line = new Line();
line.Stroke = brush;
line.StrokeThickness = 2;
line.StrokeStartLineCap = PenLineCap.Round;
line.StrokeEndLineCap = PenLineCap.Round;
line.X1 = from.X;
line.Y1 = from.Y;
line.X2 = from.X;
line.Y2 = from.Y;
position = Lerp.Speed(from, to, speed, p =>
{
line.X2 = p.X;
line.Y2 = p.Y;
Moving?.Invoke(p);
});
var brushPosition = Lerp.Speed(from, to + trailVector, speed, p =>
{
brush.StartPoint = (p - trailVector).ToPoint();
brush.EndPoint = p;
});
position.Completed += () =>
{
// Destination reached
Completed?.Invoke();
};
brushPosition.Completed += () =>
{
// Trail faded completely
Faded?.Invoke();
this.Destroy();
};
Add(position);
Add(brushPosition);
Add(line);
}
public void Fade()
{
BeginAnimation(OpacityProperty, null);
FadeStarted?.Invoke(this, EventArgs.Empty);
var anim = new DoubleAnimation(0, new Duration(TimeSpan.FromSeconds(0.2)))
{
FillBehavior = FillBehavior.Stop
};
anim.Completed += (sender, args) =>
{
Opacity = 0;
Faded?.Invoke(this, args);
};
BeginAnimation(OpacityProperty, anim);
}