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\documentclass{article} | |
\usepackage{pgfplots} | |
\usepackage{tikz} | |
\pgfplotsset{compat=1.5.1} | |
\begin{document} | |
\begin{figure} | |
\begin{tikzpicture} | |
\begin{axis}[ | |
ticks=none, | |
axis lines = middle, | |
axis line style={->}, | |
ymin=-1.3, ymax = 1.3, | |
xmin=-1.3, xmax=1.3, | |
xlabel={$x$}, | |
ylabel={$y$}, | |
axis equal image, | |
samples = 500 | |
] | |
\addplot[black, | |
fill = blue, | |
fill opacity = 0.5, | |
domain = -1.3:1.3] {1 - x}; | |
\addplot[black, | |
fill = blue, | |
fill opacity = 0.5, | |
domain = -1.3:1.3] {-1 - x}; | |
\node [rotate = -45] at (axis cs:0.6,0.6) {$y=1-x$}; | |
\node [rotate = -45] at (axis cs:-0.4,-0.4) {$y=-1-x$}; | |
\draw[dashed, | |
fill = blue, | |
fill opacity = 0.5] (axis cs:0,1) -- (axis cs:-1,1) -- (axis cs:-1,0) -- (axis cs:0,-1) -- (axis cs:1,-1) -- (axis cs:1,0) -- (axis cs:0,1); | |
\addplot[red, | |
mark = *, | |
only marks] coordinates {(-1,1) (1,1) (1,-1) (-1,-1)}; | |
\addplot[mark = ""] coordinates {(-1, 1)} node[above] {(-1,1)}; | |
\addplot[mark = ""] coordinates {(1, 1)} node[above] {(1,1)}; | |
\addplot[mark = ""] coordinates {(-1, -1)} node[below] {(-1,-1)}; | |
\addplot[mark = ""] coordinates {(1, -1)} node[below] {(1,-1)}; | |
\draw[dashed] (axis cs:-1,-1) -- (axis cs:0,-1) -- (axis cs:-1,0) -- (axis cs:-1,-1); | |
\draw[dashed] (axis cs:1,1) -- (axis cs:1,0) -- (axis cs:0,1) -- (axis cs:1,1); | |
\end{axis} | |
\end{tikzpicture} | |
\end{figure} | |
\end{document} |
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