我嘗試創建 pgf 裝飾,它能夠在每個段落中判斷其開頭是否是輸入路徑上的尖角,但我不知道如何做到這一點。
以下面的 MWE 為例。它用曲線裝飾路徑。當它到達一個角落並且沒有空間容納另一條曲線時,它只是繪製一條簡單的直線並在角落之後繪製一條曲線。我怎麼能讓它在轉角後畫另一條簡單的線,而不是開始曲線?
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations}
\pgfdeclaredecoration{examp}{A}
{
\state{A}[width=4mm,auto corner on length=4mm]
{
\pgfpathcurveto{\pgfpoint{0mm}{0}}{\pgfpoint{2mm}{5mm}}{\pgfpoint{4mm}{0}};
}
%
\state{final}
{
\pgfpathlineto{\pgfpointdecoratedpathlast};
}
}
\begin{document}
\begin{tikzpicture}
\draw[decoration={examp,path has corners=true},decorate] (0,0) -- (0,3) -- (3,3);
\end{tikzpicture}
\end{document}
答案1
這是你想要的嗎?
[我發現當我查找此內容時,percusse 留下了評論。我不確定這是否正是打擊樂的初衷。如果是這樣,請告訴我我應該刪除它。
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations}
\newlength{\prelength}
\pgfdeclaredecoration{examp}{A}
{
\state{A}
[
width=4mm,
switch if input segment less than={4mm to B},
]
{
\pgfpathcurveto{\pgfpoint{0mm}{0}}{\pgfpoint{2mm}{5mm}}{\pgfpoint{4mm}{0}};
}
\state{B}
[
width=\pgfdecoratedinputsegmentremainingdistance,
repeat state=0,
next state=C,
persistent precomputation={%
\setlength{\prelength}{\pgfdecoratedinputsegmentremainingdistance}
},
]
{
\pgflineto{\pgfpointdecoratedinputsegmentlast};
}
\state{C}
[
width=\prelength,
repeat state=0,
next state=A,
]
{
\pgflineto{\pgfpoint{\prelength}{0}};
}
\state{final}
{
\pgfpathlineto{\pgfpointdecoratedpathlast};
}
}
\begin{document}
\begin{tikzpicture}
\draw[decoration={examp},decorate] (0,0) -- (0,3) -- (3,3) |- cycle;
\draw[decoration={examp},decorate, xshift=40mm] (0,0) -- (0,3) -- (3,3) arc (90:-90:1.5) [out=135, in=45] to cycle;
\end{tikzpicture}
\end{document}