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);
}
}
}
