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如何将 TikZ 图形的一部分放入框中以测量其大小

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如何将 TikZ 图形的一部分放入框中以测量其大小

今天在pdfcomment( \pdftooltip) 中添加了对工具提示的支持后，我想制作一个TikZ带有工具提示注释的示例。\pdftooltip注释元素内设置了一个框来测量大小，这对图形的某些部分不起作用。以下示例中TikZ有解决方法（手动框或）：\textbullet

\documentclass{article}
\usepackage{tikz}
\usepackage{pdfcomment}[2011/05/19]
% http://svn.berlios.de/viewvc/pdfcomment/trunk/dev/tex/latex/pdfcomment/pdfcomment.sty?revision=11
\begin{document}
\begin{tikzpicture}[scale=1.5]
    % Draw axes
    \draw [<->,thick] (0,2) node (yaxis) [above] {$y$}
        |- (3,0) node (xaxis) [right] {$x$};
    % Draw two intersecting lines
    \draw (0,0) coordinate (a_1) -- (2,1.8) coordinate (a_2);
    \draw (0,1.5) coordinate (b_1) -- (2.5,0) coordinate (b_2);
    % Calculate the intersection of the lines a_1 -- a_2 and b_1 -- b_2
    % and store the coordinate in c.
    \coordinate (c) at (intersection of a_1--a_2 and b_1--b_2);
    % Draw lines indicating intersection with y and x axis. Here we use
    % the perpendicular coordinate system
    \draw[dashed] (yaxis |- c) node[left] {$y'$}
        -| (xaxis -| c) node[below] {$x'$};
    % Draw a dot to indicate intersection point
    %% 1 - add a box manually %%
    \fill[red] (c) circle (2pt);
    \draw (c) node {\pdftooltip{\rule{0pt}{5pt}\rule{5pt}{0pt}}{This is the intersection point\textCR of the two lines!}};
    %% 2 - use \textbullet, which produxes a size in a box %%
    %\draw[red] (c) node {\pdftooltip{\textbullet}{This is the intersection point\textCR of the two lines!}};
    %% 3 - produces an error %%
    % "\fill[red] (c) circle (2pt);" can not be put in a box to measure the size
    %\pdftooltip{\fill[red] (c) circle (2pt);}{This is the intersection point\textCR of the two lines!}}    
\end{tikzpicture}
\end{document}

带有工具提示注释的图形

有没有办法让TikZ图形的一部分放入盒子中时产生尺寸？

答案1

我会将工具提示作为路径的一部分。然后，您可以使用访问路径边界框current path bounding box并测量其尺寸。

\fill[red] (c) circle (2pt)
    let
        \p1 = (current path bounding box.south west),
        \p2 = (current path bounding box.north east)
    in
  node at (current path bounding box) {% should be in the center of the current path
    \pdftooltip{\rule{\dimexpr\x2-\x1\relax}{0pt}\rule{0pt}{\dimexpr\y2-\y1\relax}}%
    {This is the intersection point\textCR of the two lines!}%
};

然而，对于圆形来说，这似乎会生成一个适合圆形而不是围绕圆形的矩形。

对于多条路径，您可以使用示波器并使用跟踪其边界框local bounding box。然后使用与上述相同的测量技术。

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