I'm drawing a diagram for a project, but with the n vector going through the angle label it isn't very clear, I'd like to add a white background to the alpha label so it's easier to see. Thanks, see MWE below.
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{calc,patterns,angles,quotes,arrows}
\begin{document}
\begin{figure}
\begin{center}
\begin{tikzpicture}
%Define coordinates
\coordinate (origin) at (0,0);
\coordinate (bhat) at (0,5);
\coordinate (zetahat) at (5,0);
\coordinate (vector) at (3,4);
\coordinate (normal) at (1.581,4.743);
%Draw axes
\draw[thick, <->] (bhat) node[above]{$\hat{b}$} -- (origin) -- (zetahat) node[right]{$\hat{\zeta}$};
%Draw vector
\draw[thick, ->, blue] (origin) -- (vector) node[above]{$\vec{v_r}$};
%N vector
\draw[thick, dotted, ->] (origin) -- (normal) node[above]{$\hat{n}$};
%Draw angle
\pic [draw, "$\alpha$", angle eccentricity = 1.2, angle radius = 1.5cm, thick] {angle = vector--origin--bhat};
\end{tikzpicture}
\caption{Pitch angle $\alpha$ is equal to $2\theta_{bn}$, showing specular reflection}
\label{fig:Pitch Angle}
\end{center}
\end{figure}
\end{document}
Best Answer
Use
"$\alpha$"{fill=white}
instead of"$\alpha$"
in\pic