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\documentclass[a4]{article} |
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\usepackage{tikz} |
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\begin{document} |
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Draw a box and label the corners and the center: |
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\begin{tikzpicture} |
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\draw (0,0) -- (0,1) -- (1,1) -- (1,0) -- (0,0); |
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\node [below left] at (0,0) {$a$}; |
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\node [above left] at (0,1) {$b$}; |
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\node [above right] at (1,1) {$c$}; |
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\node [below right] at (1,0) {$d$}; |
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\draw [fill] (0.5,0.5) circle [radius=0.5pt]; |
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\node [above right] at (0.45,0.45) {\small {$e$}}; |
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\end{tikzpicture} |
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\bigskip \hrule \bigskip |
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Draw some lines: |
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\bigskip |
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\begin{tikzpicture} |
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\draw [|-] (0,0) -- (2,0); |
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\draw [|-<] (0,0.5) -- (2,0.5); |
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\draw [|->] (0,1) -- (2,1); |
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\end{tikzpicture} |
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\bigskip \hrule \bigskip |
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\paragraph{An experiment with polar coordinates} |
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This does not work: |
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\vspace{1.5cm} |
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\begin{tikzpicture} |
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\tikz \draw [->] (0,0) -- (0:1); |
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\tikz \draw [->] (0,0) -- (72:1); |
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\tikz \draw [->] (0,0) -- (144:1); |
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\tikz \draw [->] (0,0) -- (216:1); |
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\tikz \draw [->] (0,0) -- (288:1); |
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\end{tikzpicture} |
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\bigskip |
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But this does: |
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\bigskip |
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\begin{tikzpicture} |
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\foreach \a in {0, 72,...,288} |
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\draw [->] (0,0) -- (\a:1); |
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\end{tikzpicture} |
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\end{document} |