Flag of China
Author
Senan Sekhon
License
Creative Commons CC BY 4.0
Abstract
Flag of the People's Republic of China, according to official government specifications
Flag of the People's Republic of China, according to official government specifications
\documentclass[10pt]{article}
%This is the minimal setup required to render the flag
\usepackage[paperwidth=30cm, paperheight=20cm, top=0cm, bottom=0cm, left=0cm, right=0cm]{geometry}
%Paper width is set to 30cm by 20cm to match the Chinese Government-specified aspect ratio (3:2)
\usepackage{tikz}
%\usepackage[dvipsnames]{xcolor} % Optional unless you want to use colors pre-defined by the xcolor package
% Chinese Government-specified colors for the flag
\definecolor{chred}{HTML}{DE2910}
\definecolor{chyel}{HTML}{FFDE00}
% Other government specifications include:
% Diameter of large star is 1/5 flag width, here it is 6 cm
% Diameter of each small star is 1/15 flag width, here it is 2 cm
% Each small star is rotated so one point directly faces the center of the large star
%Source: https://www.crwflags.com/fotw/flags/cn.html
%Created by Senan Sekhon, December 9, 2020
\begin{document}
\begin{center} %Optional, but helps to tidy up the layout
\begin{tikzpicture}[scale=1] %Scale must be changed to make the flag fit on letter/A4 paper (scale=1 produces a 30 cm by 20 cm flag)
\clip (-15,-10) rectangle (15,10); %Optional, crops the flag to the correct size
\draw[black] (-15,-10)--(15,-10)--(15,10)--(-15,10)--cycle; %Optional, draws a border around the flag
\fill[chred] (-15,-10)--(15,-10)--(15,10)--(-15,10)--cycle; %Red background
%Template for a star, this can be shifted, scaled and rotated as you wish
\def\star{(0,4)--({sqrt(50-22*sqrt(5))},{-1+sqrt(5)})--({+sqrt(10+2*sqrt(5))},{-1+sqrt(5)})--({2*sqrt(5-2*sqrt(5))},{+4-2*sqrt(5)})--({+sqrt(10-2*sqrt(5))},{-1-sqrt(5)})--(0,{-6+2*sqrt(5)})--({-sqrt(10-2*sqrt(5))},{-1-sqrt(5)})--({-2*sqrt(5-2*sqrt(5))},{+4-2*sqrt(5)})--({-sqrt(10+2*sqrt(5))},{-1+sqrt(5)})--({-sqrt(50-22*sqrt(5))},{-1+sqrt(5)})--cycle}
%Outer scope for shifting, scaling and rotation of the entire 5-star pattern
\begin{scope}[shift={(-10,5)},scale=1,rotate=0]
%Inner scopes for shifting, scaling and rotation of each individual star
\begin{scope}[shift={(0,0)},scale=3/4,rotate=0]
\fill[chyel] \star; %Large star
\end{scope}
%Small stars, clockwise from the top
\begin{scope}[shift={(5,3)},scale=1/4,rotate=90+atan(3/5)]
\fill[chyel] \star;
\end{scope}
\begin{scope}[shift={(7,1)},scale=1/4,rotate=90+atan(1/7)]
\fill[chyel] \star;
\end{scope}
\begin{scope}[shift={(7,-2)},scale=1/4,rotate=90-atan(2/7)]
\fill[chyel] \star;
\end{scope}
\begin{scope}[shift={(5,-4)},scale=1/4,rotate=90-atan(4/5)]
\fill[chyel] \star;
\end{scope}
\end{scope}
\end{tikzpicture}
\end{center}
\end{document}