/// <summary>
/// Core update routine.
/// </summary>
/// <param name="context">An AnimationContext that provides internal animation information.</param>
protected override void UpdateAnimationOverride(AnimationContext context)
{
base.UpdateAnimationOverride(context);
if (context == null)
{
return;
}
Point from = GetPoint(context.Target, this.StartPoint);
Point to = GetPoint(context.Target, this.EndPoint);
double duration = this.Duration.TimeSpan.TotalSeconds;
RectangleGeometry geom = new RectangleGeometry();
context.Target.Clip = geom;
if (this.reverseClipAnimation)
{
context.SingleProperty("ClipStartXProperty", 0, 0, duration, -to.X);
context.SingleProperty("ClipStartYProperty", 0, 0, duration, -to.Y);
}
else
{
context.SingleProperty("ClipStartXProperty", 0, -from.X, duration, 0);
context.SingleProperty("ClipStartYProperty", 0, -from.Y, duration, 0);
}
SetAnimationCompleteCallback(context);
}