Draw an helix with repeated protomers with LaTeX Tikz
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| \documentclass{article} | |
| \usepackage{tikz} | |
| \begin{document} | |
| \thispagestyle{empty} | |
| \begin{tikzpicture}[ | |
| % x=10mm, | |
| % y=cos(30)*10mm, | |
| % z={(0, -sin(30)*10mm)}, | |
| ] | |
| \def\cylrad{.325}% radius 65 angstrom diameter (65/2/100) for scalling | |
| \def\cylht{1.69} % 10.4 angstrom axial rise (10.4/2*.325) | |
| \draw | |
| (-\cylrad, \cylht) -- (-\cylrad, 0) -- | |
| plot[smooth, samples=25, variable=\t, domain=180:360] | |
| ({cos(\t)*\cylrad}, 0, {-sin(\t)*\cylrad}) -- | |
| (\cylrad, \cylht) | |
| plot[smooth cycle, samples=51, variable=\t, domain=0:360] | |
| ({cos(\t)*\cylrad}, \cylht, {-sin(\t)*\cylrad}) | |
| ; | |
| \draw[densely dashed] | |
| plot[smooth, samples=9, variable=\t, domain=0:180] | |
| ({cos(\t)*\cylrad}, 0, {-sin(\t)*\cylrad}) | |
| ; | |
| \draw[semithick] | |
| \foreach \y in {0, \cylht/2} { | |
| plot[smooth, samples=25, variable=\t, domain=180:360] | |
| ({cos(\t)*\cylrad}, {\y + (\t-180)*\cylht/720}, {-sin(\t)*\cylrad}) | |
| } | |
| ; | |
| \draw[semithick, densely dashed] | |
| \foreach \y in {\cylht/4, 3*\cylht/4} { | |
| plot[smooth, samples=25, variable=\t, domain=0:180] | |
| ({cos(\t)*\cylrad}, {\y + \t*\cylht/720}, {-sin(\t)*\cylrad}) | |
| } | |
| ; | |
| \draw | |
| \foreach \p in {1,2,3,4}{ % 84.5 degree twist angle and 4 protomers... | |
| ({-cos(\p*84.5)*\cylrad}, {\p*84.5*\cylht/720}, {sin(\p*84.5)*\cylrad}) node [circle, inner sep=0pt, fill=black, draw, minimum size=1mm] {} | |
| } | |
| ; | |
| \end{tikzpicture} | |
| \end{document} |
