internal void DrawMarkers(SvgMarkerElement svgMarkerElement, SKPath sKPath)
{
var pathTypes = SkiaUtil.GetPathTypes(sKPath);
var pathLength = pathTypes.Count;
if (svgMarkerElement.MarkerStart != null)
{
var refPoint1 = pathTypes[0].Point;
var index = 1;
while (index < pathLength && pathTypes[index].Point == refPoint1)
{
++index;
}
var refPoint2 = pathTypes[index].Point;
var marker = svgMarkerElement.OwnerDocument.GetElementById <SvgMarker>(svgMarkerElement.MarkerStart.ToString());
DrawMarker(marker, svgMarkerElement, refPoint1, refPoint1, refPoint2, true);
}
if (svgMarkerElement.MarkerMid != null)
{
var marker = svgMarkerElement.OwnerDocument.GetElementById <SvgMarker>(svgMarkerElement.MarkerMid.ToString());
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)
{
DrawMarker(marker, svgMarkerElement, pathTypes[i].Point, pathTypes[i - 1].Point, pathTypes[i].Point, pathTypes[i + 1].Point);
}
}
}
if (svgMarkerElement.MarkerEnd != null)
{
var marker = svgMarkerElement.OwnerDocument.GetElementById <SvgMarker>(svgMarkerElement.MarkerEnd.ToString());
var index = pathLength - 1;
var refPoint1 = pathTypes[index].Point;
--index;
while (index > 0 && pathTypes[index].Point == refPoint1)
{
--index;
}
var refPoint2 = pathTypes[index].Point;
DrawMarker(marker, svgMarkerElement, refPoint1, refPoint2, pathTypes[pathLength - 1].Point, false);
}
}