protected override void OnVisualBoundsChanged()
{
if (RenderTransform.IsNullOrIdentity())
{
return;
}
InvalidateVisualTransform();
}
private void OnRenderTransformOriginChanged(DependencyPropertyChangedEventArgs e)
{
if (RenderTransform.IsNullOrIdentity())
{
return;
}
InvalidateVisualTransform();
}
protected override Matrix GetVisualTransformOverride()
{
if (RenderTransform.IsNullOrIdentity())
{
return(Matrix.Identity);
}
double offsetX = RenderTransformOrigin.X * RenderSize.Width;
double offsetY = RenderTransformOrigin.Y * RenderSize.Height;
return(Matrix.TranslationMatrix(-offsetX, -offsetY) * RenderTransform.Value * Matrix.TranslationMatrix(offsetX, offsetY));
}
