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30 lines
957 B
TeX
30 lines
957 B
TeX
\documentclass{article}
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\usepackage[pdftex,active,tightpage]{preview}
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\setlength\PreviewBorder{2mm}
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\usepackage{tikz}
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\begin{document}
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\begin{preview}
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\begin{tikzpicture}
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% Draw axes
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\draw [<->,thick] (0,2.5) node (yaxis) [above] {$x_2$}
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|- (2.5,0) node (xaxis) [right] {$x_1$};
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% Draw two intersecting lines
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\draw[thick, dashed] (1,1) coordinate (a) -- (2,1) coordinate (b);
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\draw[thick, dashed] (a) -- (1,2) coordinate (d);
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\draw[thick] (d) -- (2,2) coordinate (c);
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\draw[thick] (b) -- (2,2);
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\fill[green!15] (a) -- (b) -- (c) -- (d) -- (a);
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% Draw lines indicating intersection with y and x axis. Here we
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% use the perpendicular coordinate system
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\draw[dotted] (yaxis |- a) node[left] {$a_2$}
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-| (xaxis -| a) node[below] {$a_1$};
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\draw[dotted] (yaxis |- c) node[left] {$b_2$}
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-| (xaxis -| c) node[below] {$b_1$};
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\end{tikzpicture}
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\end{preview}
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\end{document}
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