一则过度定制的例子 ```tex \documentclass{article} \usepackage{tikz} \usetikzlibrary{patterns.meta} % derived from `texdoc tikz`, sec. 62.3 \tikzdeclarepattern{% name=lines, parameters={ \pgfkeysvalueof{/pgf/pattern keys/size}, \pgfkeysvalueof{/pgf/pattern keys/angle}, \pgfkeysvalueof{/pgf/pattern keys/line width}, \pgfkeysvalueof{/pgf/pattern keys/color}, }, bounding box={(-.1pt,-.1pt) and (\pgfkeysvalueof{/pgf/pattern keys/size}+.1pt, \pgfkeysvalueof{/pgf/pattern keys/size}+.1pt)}, tile size={(\pgfkeysvalueof{/pgf/pattern keys/size}, \pgfkeysvalueof{/pgf/pattern keys/size})}, tile transformation={rotate=\pgfkeysvalueof{/pgf/pattern keys/angle}}, defaults={ size/.initial=5pt, angle/.initial=0, line width/.initial=.2pt, color/.initial=gray, }, code={ \draw[line width=\pgfkeysvalueof{/pgf/pattern keys/line width}, color=\pgfkeysvalueof{/pgf/pattern keys/color}] (0,0) -- (\pgfkeysvalueof{/pgf/pattern keys/size}, \pgfkeysvalueof{/pgf/pattern keys/size}); } } \begin{document} \tikzset{ tag label/.style={ above right, font=\small, inner sep=2pt } } % shorthands: sqr - square, R - reversed \begin{tikzpicture}[scale=2, samples=500] \draw[help lines] (0, 0) grid (2, 2); % slanted lines \fill[pattern={lines[angle=160]}] plot[id=squ, domain=0:1] function{x*x} -- (1, 2) -- (0.5, 2) -- plot[id=8squR, domain=.5:0] function{8*x*x} -- cycle; \fill[pattern={lines[angle=180]}] plot[id=2squ, domain=0:1] function{2*x*x} -- (0.5, 2) -- plot[id=8squR, domain=.5:0] function{8*x*x} -- cycle; % plots and labels \draw plot[id=squ, domain=0:1] function{x*x} node[tag label] {$x^2$}; \draw plot[id=2squ, domain=0:1] function{2*x*x} node[tag label] {$2x^2$}; \draw plot[id=8squ, domain=0:.5] function{8*x*x} node[tag label, above] {$8x^2$}; \end{tikzpicture} \end{document} ```  1. 因为用了 `plot function{...}` 的语法，需要使用 `-shell-escape` 选项并安装 gnuplot 绘图程序。调用 gnuplot 旨在减少坐标重复计算、加快编译速度，用 `plot (, )` 的语法也完全可以。 1. 只要是封闭图形就能 `\fill`，需要注意 `--plot` 和 `plot` 的不同，详见 `texdoc tikz`, sec. 22.2。 1. 提供这个回答只是说明「能画」，个人强烈建议用所见即所得的绘图工具作图。