Created
April 18, 2023 21:56
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| \newcommand{\convexpath}[2]{ | |
| [ | |
| create hullnodes/.code={ | |
| \global\edef\namelist{#1} | |
| \foreach [count=\counter] \nodename in \namelist { | |
| \global\edef\numberofnodes{\counter} | |
| \node at (\nodename) [draw=none,name=hullnode\counter] {}; | |
| } | |
| \node at (hullnode\numberofnodes) [name=hullnode0,draw=none] {}; | |
| \pgfmathtruncatemacro\lastnumber{\numberofnodes+1} | |
| \node at (hullnode1) [name=hullnode\lastnumber,draw=none] {}; | |
| }, | |
| create hullnodes | |
| ] | |
| ($(hullnode1)!#2!-90:(hullnode0)$) | |
| \foreach [ | |
| evaluate=\currentnode as \previousnode using \currentnode-1, | |
| evaluate=\currentnode as \nextnode using \currentnode+1 | |
| ] \currentnode in {1,...,\numberofnodes} { | |
| let | |
| \p1 = ($(hullnode\currentnode)!#2!-90:(hullnode\previousnode)$), | |
| \p2 = ($(hullnode\currentnode)!#2!90:(hullnode\nextnode)$), | |
| \p3 = ($(\p1) - (hullnode\currentnode)$), | |
| \n1 = {atan2(\y3,\x3)}, | |
| \p4 = ($(\p2) - (hullnode\currentnode)$), | |
| \n2 = {atan2(\y4,\x4)}, | |
| \n{delta} = {-Mod(\n1-\n2,360)} | |
| in | |
| {-- (\p1) arc[start angle=\n1, delta angle=\n{delta}, radius=#2] -- (\p2)} | |
| } | |
| -- cycle | |
| } | |
| \begin{tikzpicture} | |
| \begin{pgfonlayer}{nodelayer} | |
| \node [style=white node] (1) at (0, 0) {}; | |
| \node [style=black node] (2) at (-2, 0) {}; | |
| \node [style=black node] (3) at (2, 0) {}; | |
| % ........ | |
| \end{pgfonlayer} | |
| \begin{pgfonlayer}{edgelayer} | |
| \draw (1) to (3); | |
| \draw (2) to (1); | |
| \draw (2) to (4); | |
| % ....... | |
| \end{pgfonlayer} | |
| \begin{pgfonlayer}{background} | |
| \fill[cyan,opacity=1] \convexpath{1,2}{8pt}; | |
| \fill[cyan,opacity=1] \convexpath{2,4}{8pt}; | |
| \fill[cyan,opacity=1] \convexpath{2,5,6,7,8,9,10}{8pt}; | |
| % ...... | |
| \end{pgfonlayer} | |
| \end{tikzpicture} |
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