//==========================================================================
public DrawingBrush?GetOpacityMask()
{
var drawing_group = new DrawingGroup();
foreach (var child_element in Children)
{
var element = child_element;
if (element is SvgUseElement use_element)
{
element = use_element.GetElement();
}
var drawing = element switch
{
SvgDrawableBaseElement drawable_base_element => drawable_base_element.Draw(),
SvgDrawableContainerBaseElement base_element => base_element.Draw(),
_ => null
};
if (drawing != null)
{
drawing_group.Children.Add(drawing);
}
}
if (drawing_group.Children.Count == 0)
{
return(null);
}
foreach (var drawing in drawing_group.Children)
{
ConvertColors(drawing);
}
var brush = new DrawingBrush(drawing_group);
if (MaskUnits != SvgMaskUnits.UserSpaceOnUse)
{
return(brush);
}
brush.ViewportUnits = BrushMappingMode.Absolute;
brush.Viewport = drawing_group.Bounds;
return(brush);
}
} // class SvgMaskElement
//==========================================================================
public override Drawing Draw()
{
var drawing_group = new DrawingGroup {
Opacity = Opacity.ToDouble()
};
if (Transform != null)
{
drawing_group.Transform = Transform.ToTransform();
}
foreach (var element in Children)
{
var drawing = element switch
{
SvgDrawableBaseElement base_element => base_element.Draw(),
SvgDrawableContainerBaseElement base_element => base_element.Draw(),
_ => null
};
if (drawing != null)
{
drawing_group.Children.Add(drawing);
}
}
if (Filter != null)
{
if (Document.Elements[Filter.Id] is SvgFilterElement filter_element)
{
drawing_group.BitmapEffect = filter_element.ToBitmapEffect();
}
}
if (ClipPath != null)
{
if (Document.Elements[ClipPath.Id] is SvgClipPathElement clip_path_element)
{
drawing_group.ClipGeometry = clip_path_element.GetClipGeometry();
}
}
if (Mask != null)
{
if (Document.Elements[Mask.Id] is SvgMaskElement mask_element)
{
drawing_group.OpacityMask = mask_element.GetOpacityMask();
var geometry_group = new GeometryGroup();
if (drawing_group.ClipGeometry != null)
{
geometry_group.Children.Add(drawing_group.ClipGeometry);
}
geometry_group.Children.Add(mask_element.GetClipGeometry());
drawing_group.ClipGeometry = geometry_group;
}
}
return(drawing_group);
}
} // class SvgFlowRootElement