Re: questin concerning insert path

Hi,

The `insert path' key only allows you to insert path commands in the 
current path, these inserted commands are then used with prevailing 
fill/draw options of the main path.

Although it could be done with a decoration, or with plot marks, it also 
possible to define an `insert new path' key, which interrupts the main 
path allows a completely new path to be drawn with its own draw/fill. It 
does, however, involve some basic layer hackery. Note also, that these 
inserted paths are filled/drawn *before* the main path, and so would 
appear behind it.

\documentclass{article}

\usepackage{tikz}

\begin{document}
\makeatletter
\tikzset{
	insert new path/.style={
		insert path={
			\pgfextra{
				\edef\tikz <at> last <at> point{{\the\tikz <at> lastx}{\the\tikz <at> lasty}}%
				\pgfinterruptpath%
					\pgftransformshift{\expandafter\pgfqpoint\tikz <at> last <at> point}%
					#1%
				\endpgfinterruptpath%
			}
		}