https://learn.microsoft.com/en-us/dotnet/api/system.drawing.drawing2d.graphicspathiterator.nextsubpath?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
GraphicsPathIterator.NextSubpath Method (System.Drawing.Drawing2D) | Microsoft Learn
Moves the subpath to the next subpath in the specified GraphicsPath.
methodsystemdrawingmicrosoftlearn