pgf/tikz と戯れる

\documentclass[uplatex,dvipdfmx,ja=standard,base=12pt,a4paper,fleqn]{bxjsarticle}
% chktex-file 3 chktex-file 19

\usepackage[dvipdfmx]{graphicx}

\usepackage[T1]{fontenc}
\usepackage{lmodern}

\usepackage{mathtools}
\newcommand{\sads}{\SwapAboveDisplaySkip}
\usepackage{enumitem}
\usepackage[rmdefault]{mathcomp}
\usepackage{tcolorbox}
\tcbuselibrary{breakable}
\tcbset{colback=white, breakable}
%\usepackage{bm}
%\usepackage{booktabs}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
%\usepackage{tikz}
%\usetikzlibrary{angles, quotes, backgrounds}
%\usepackage{ulem}
%\usepackage{units}


\usepackage{fancyhdr}
\usepackage{lastpage}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\rhead{2017年8月1日} 
%\cfoot{}
\cfoot{\thepage{}/{}\pageref{LastPage}}

%\addtolength{\jot}{.5\baselineskip}

\usepackage{MYMACROS}

%\renewcommand{\baselinestretch}{1.5}