正如標題所述,我想知道如果tikzpicture
.如果是這樣,我將如何實現這一目標?
我的用例是,我正在研究一小組用於生成繪圖的宏,如果我在某個定義的繪圖區域之外繪製了任何內容,我希望收到警告。我在繪圖中使用剪切來防止繪製區域之外的任何內容。這可以防止頁面佈局混亂,但使用者不知道頁面上實際上沒有放置某些內容(除了手動檢查輸出)。在我的特定用例中向用戶發出提示是很好的。
clip warn
理想情況下,可以透過在scope
環境或剪輯本身上放置樣式(例如 )來啟用此警告\path
。
這是一個用於起點和測試目的的 MWE:
\documentclass{article}
\usepackage{tikz}
\tikzset{x=1em,y=1em}
\tikzset{
clip warn/.style = {
% insert magic code here
},
}
\begin{document}
This diagram should not produce a warning:
\tikz{\path[clip] (0,0) rectangle (1,1); \draw (0.25,0.25) -- (0.75,0.75)}
This diagram should produce a warning:
\tikz{\path[clip] (0,0) rectangle (1,1); \draw (-0.25,0.25) -- (0.25,0.75)}
\end{document}
答案1
修訂。這是一個計算與邊界框的交點的程式碼片段,如果存在則發出警告。 (顯然,如果您的路徑完全位於邊界框之外,則不會發出警告。)在此版本中,必須將其放置\IssueWarnings
在圖片的末尾,我不知道為什麼execute at end picture={\IssueWarning}
會失敗。任何有關這方面的資訊都將受到高度讚賞。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{intersections}
\tikzset{x=1em,y=1em}
\newcounter{Paths}
\makeatletter% from https://tex.stackexchange.com/a/5354/121799
\tikzset{nomorepostaction/.code=\let\tikz@postactions\pgfutil@empty
\stepcounter{Paths}}
\newcommand\CheckIfPathExists[1]{
\pgfutil@ifundefined{tikz@intersect@path@name@#1}{\global\def\myPathExists{0}}{\global\def\myPathExists{1}}
}
\makeatother
\newcommand{\IssueWarnings}{\CheckIfPathExists{clip}
\ifnum\myPathExists=1
\xdef\CurrentPaths{\thePaths}
\foreach \i in {2,...,\CurrentPaths}
{\fill [name intersections={of=clip and path\i, name=i, total=\t}]
%[red, opacity=0.5, every node/.style={above left, black, opacity=1}]
\pgfextra{\xdef\Warn{\t}};
}
\ifnum\Warn>0\typeout{Warning: some paths got clipped}\fi
\else
\typeout{clip path not found}
\fi
}
\tikzset{
clip warn/.style = {clip,name path=clip},
every picture/.style={%
execute at begin picture={\setcounter{Paths}{0}},
execute at end picture={%
% \IssueWarnings %<- doesn't work and I dunno why
},
},
every path/.style={postaction={nomorepostaction,draw,
name path=path\thePaths}}}
\begin{document}
This diagram should not produce a warning:
\tikz{\path[clip warn] (0,0) rectangle (1,1);
\draw (0.25,0.25) -- (0.25,0.75);
\IssueWarnings
}
This diagram should produce a warning:%\typeout{checking second picture}
\tikz{\path[clip warn] (0,0) rectangle (1,1);
\draw (-0.25,0.25) -- (0.25,0.75);
\IssueWarnings
}
\end{document}