SNR_schematic.tex

\documentclass{standalone}
%\pagenumbering{gobble}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% schematic of SN blast wave

% big help from
% tex.stackexchange.com/questions/299999/shading-the-area-between-arcs-with-a-rainbow
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\usepackage{tikz}
\usepackage[outline]{contour}
\usetikzlibrary{arrows, snakes, calc}
\usetikzlibrary{shapes.geometric}

%[draw options] (center) (initial angle:final angle:inner radius:outer radius)
\def\myarc[#1](#2)(#3:#4:#5:#6) {\draw[#1] ($(#2) + (#3:#5)$) arc (#3:#4:#5)
		--  ($(#2) + (#4:#6)$) arc (#4:#3:#6) -- cycle;}

\begin{document}

\tikzset{
	trans/.style={very thick, dashed,->,shorten >=2pt,shorten <=0pt,>=stealth},
	photon/.style={very thick, ->, snake=snake, line after snake=1mm}
	}


\begin{tikzpicture}[scale=1.0, font=\sffamily]

	\myarc[fill=gray!30](0,0)(10:170:0:2.4)
	\myarc[fill=gray!80, dotted](0,0)(10:170:2.3:3.1)
	\myarc[fill=white, dashed](0,0)(10:170:3.1:6)
	\myarc[fill=black](0,0)(10:170:3.1:3.25)
	\node[star,star points=7,star point ratio=1.8, fill] at (0,0) {};

	\node at (0,2.65) {\large{$\rho_2$}};
	\node at (0,4.7) {\large{$\rho_1$}};
	\node[rotate=0] at (1.35,0.0) {\large{$R$}};
	\node[rotate=0] at (2.75,0.22) {\large{$\Delta R$}};

	\draw[line width = 0.7mm, rotate=0, ->] (0,3.1) -- ++(0,0.7);
	\draw[line width = 0.7mm, rotate=-45, ->] (0,3.1) -- ++(0,0.7);
	\draw[line width = 0.7mm, rotate=45, ->] (0,3.1) -- ++(0,0.7);

\end{tikzpicture}
\end{document}