public static SKPath?GetSvgVisualElementClipPath(SvgVisualElement svgVisualElement, SKRect skBounds, HashSet <Uri> uris, CompositeDisposable disposable)
{
if (svgVisualElement == null || svgVisualElement.ClipPath == null)
{
return(null);
}
if (SvgExtensions.HasRecursiveReference(svgVisualElement, (e) => e.ClipPath, uris))
{
return(null);
}
var svgClipPath = SvgExtensions.GetReference <SvgClipPath>(svgVisualElement, svgVisualElement.ClipPath);
if (svgClipPath == null || svgClipPath.Children == null)
{
return(null);
}
return(GetClipPath(svgClipPath, skBounds, uris, disposable));
}
public static void CreateMarkers(this SvgMarkerElement svgMarkerElement, SKPath skPath, SKRect skOwnerBounds, ref List <Drawable>?markerDrawables, CompositeDisposable disposable)
{
var pathTypes = skPath.GetPathTypes();
var pathLength = pathTypes.Count;
var markerStart = svgMarkerElement.MarkerStart;
if (markerStart != null && pathLength > 0 && !SvgExtensions.HasRecursiveReference(svgMarkerElement, (e) => e.MarkerStart, new HashSet <Uri>()))
{
var marker = SvgExtensions.GetReference <SvgMarker>(svgMarkerElement, markerStart);
if (marker != null)
{
var refPoint1 = pathTypes[0].Point;
var index = 1;
while (index < pathLength && pathTypes[index].Point == refPoint1)
{
++index;
}
var refPoint2 = pathLength == 1 ? refPoint1 : pathTypes[index].Point;
CreateMarker(marker, svgMarkerElement, refPoint1, refPoint1, refPoint2, true, skOwnerBounds, ref markerDrawables, disposable);
}
}
var markerMid = svgMarkerElement.MarkerMid;
if (markerMid != null && pathLength > 0 && !SvgExtensions.HasRecursiveReference(svgMarkerElement, (e) => e.MarkerMid, new HashSet <Uri>()))
{
var marker = SvgExtensions.GetReference <SvgMarker>(svgMarkerElement, markerMid);
if (marker != null)
{
int bezierIndex = -1;
for (int i = 1; i <= pathLength - 2; i++)
{
// for Bezier curves, the marker shall only been shown at the last point
if ((pathTypes[i].Type & (byte)PathPointType.PathTypeMask) == (byte)PathPointType.Bezier)
{
bezierIndex = (bezierIndex + 1) % 3;
}
else
{
bezierIndex = -1;
}
if (bezierIndex == -1 || bezierIndex == 2)
{
CreateMarker(marker, svgMarkerElement, pathTypes[i].Point, pathTypes[i - 1].Point, pathTypes[i].Point, pathTypes[i + 1].Point, skOwnerBounds, ref markerDrawables, disposable);
}
}
}
}
var markerEnd = svgMarkerElement.MarkerEnd;
if (markerEnd != null && pathLength > 0 && !SvgExtensions.HasRecursiveReference(svgMarkerElement, (e) => e.MarkerEnd, new HashSet <Uri>()))
{
var marker = SvgExtensions.GetReference <SvgMarker>(svgMarkerElement, markerEnd);
if (marker != null)
{
var index = pathLength - 1;
var refPoint1 = pathTypes[index].Point;
if (pathLength > 1)
{
--index;
while (index > 0 && pathTypes[index].Point == refPoint1)
{
--index;
}
}
var refPoint2 = pathLength == 1 ? refPoint1 : pathTypes[index].Point;
CreateMarker(marker, svgMarkerElement, refPoint1, refPoint2, pathTypes[pathLength - 1].Point, false, skOwnerBounds, ref markerDrawables, disposable);
}
}
}
public static SKPath?GetClipPath(SvgVisualElement svgVisualElement, SKRect skBounds, HashSet <Uri> uris, CompositeDisposable disposable)
{
if (!CanDraw(svgVisualElement, Attributes.None))
{
return(null);
}
switch (svgVisualElement)
{
case SvgPath svgPath:
{
var fillRule = (svgPath.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgPath.PathData?.ToSKPath(fillRule, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgPath.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgPath, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgRectangle svgRectangle:
{
var fillRule = (svgRectangle.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgRectangle.ToSKPath(fillRule, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgRectangle.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgRectangle, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgCircle svgCircle:
{
var fillRule = (svgCircle.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgCircle.ToSKPath(fillRule, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgCircle.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgCircle, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgEllipse svgEllipse:
{
var fillRule = (svgEllipse.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgEllipse.ToSKPath(fillRule, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgEllipse.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgEllipse, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgLine svgLine:
{
var fillRule = (svgLine.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgLine.ToSKPath(fillRule, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgLine.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgLine, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgPolyline svgPolyline:
{
var fillRule = (svgPolyline.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgPolyline.Points?.ToSKPath(fillRule, false, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgPolyline.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgPolyline, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgPolygon svgPolygon:
{
var fillRule = (svgPolygon.ClipRule == SvgClipRule.EvenOdd) ? SvgFillRule.EvenOdd : SvgFillRule.NonZero;
var skPath = svgPolygon.Points?.ToSKPath(fillRule, true, skBounds, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgPolygon.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgPolygon, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgUse svgUse:
{
if (SvgExtensions.HasRecursiveReference(svgUse, (e) => e.ReferencedElement, new HashSet <Uri>()))
{
break;
}
var svgReferencedVisualElement = SvgExtensions.GetReference <SvgVisualElement>(svgUse, svgUse.ReferencedElement);
if (svgReferencedVisualElement == null || svgReferencedVisualElement is SvgSymbol)
{
break;
}
if (!CanDraw(svgReferencedVisualElement, Attributes.None))
{
break;
}
var skPath = GetClipPath(svgReferencedVisualElement, skBounds, uris, disposable);
if (skPath != null)
{
var skMatrix = SvgTransformsExtensions.ToSKMatrix(svgUse.Transforms);
skPath.Transform(skMatrix);
var skPathClip = GetSvgVisualElementClipPath(svgUse, skPath.Bounds, uris, disposable);
if (skPathClip != null)
{
var result = skPath.Op(skPathClip, SKPathOp.Intersect);
disposable.Add(result);
return(result);
}
return(skPath);
}
}
break;
case SvgText svgText:
{
// TODO: Get path from SvgText.
}
break;
default:
break;
}
return(null);
}
public UseDrawable(SvgUse svgUse, SKRect skOwnerBounds, Drawable?root, Drawable?parent, Attributes ignoreAttributes = Attributes.None)
: base(svgUse, root, parent)
{
IgnoreAttributes = ignoreAttributes;
IsDrawable = CanDraw(svgUse, IgnoreAttributes) && HasFeatures(svgUse, IgnoreAttributes);
if (!IsDrawable)
{
return;
}
if (SvgExtensions.HasRecursiveReference(svgUse, (e) => e.ReferencedElement, new HashSet <Uri>()))
{
IsDrawable = false;
return;
}
var svgReferencedElement = SvgExtensions.GetReference <SvgElement>(svgUse, svgUse.ReferencedElement);
if (svgReferencedElement == null)
{
IsDrawable = false;
return;
}
float x = svgUse.X.ToDeviceValue(UnitRenderingType.Horizontal, svgUse, skOwnerBounds);
float y = svgUse.Y.ToDeviceValue(UnitRenderingType.Vertical, svgUse, skOwnerBounds);
float width = svgUse.Width.ToDeviceValue(UnitRenderingType.Horizontal, svgUse, skOwnerBounds);
float height = svgUse.Height.ToDeviceValue(UnitRenderingType.Vertical, svgUse, skOwnerBounds);
if (width <= 0f)
{
width = new SvgUnit(SvgUnitType.Percentage, 100f).ToDeviceValue(UnitRenderingType.Horizontal, svgUse, skOwnerBounds);
}
if (height <= 0f)
{
height = new SvgUnit(SvgUnitType.Percentage, 100f).ToDeviceValue(UnitRenderingType.Vertical, svgUse, skOwnerBounds);
}
var originalReferencedElementParent = svgReferencedElement.Parent;
var referencedElementParent = default(FieldInfo);
try
{
referencedElementParent = svgReferencedElement.GetType().GetField("_parent", BindingFlags.NonPublic | BindingFlags.Instance);
if (referencedElementParent != null)
{
referencedElementParent.SetValue(svgReferencedElement, svgUse);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex.StackTrace);
}
svgReferencedElement.InvalidateChildPaths();
if (svgReferencedElement is SvgSymbol svgSymbol)
{
ReferencedDrawable = new SymbolDrawable(svgSymbol, x, y, width, height, skOwnerBounds, root, this, ignoreAttributes);
_disposable.Add(ReferencedDrawable);
}
else
{
var drawable = DrawableFactory.Create(svgReferencedElement, skOwnerBounds, root, this, ignoreAttributes);
if (drawable != null)
{
ReferencedDrawable = drawable;
_disposable.Add(ReferencedDrawable);
}
else
{
IsDrawable = false;
return;
}
}
IsAntialias = SvgPaintingExtensions.IsAntialias(svgUse);
TransformedBounds = ReferencedDrawable.TransformedBounds;
Transform = SvgTransformsExtensions.ToSKMatrix(svgUse.Transforms);
if (!(svgReferencedElement is SvgSymbol))
{
var skMatrixTranslateXY = SKMatrix.MakeTranslation(x, y);
Transform = Transform.PreConcat(skMatrixTranslateXY);
}
Fill = null;
Stroke = null;
// TODO: Transform _skBounds using _skMatrix.
TransformedBounds = Transform.MapRect(TransformedBounds);
try
{
if (referencedElementParent != null)
{
referencedElementParent.SetValue(svgReferencedElement, originalReferencedElementParent);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex.StackTrace);
}
}