☰

tikz，定位库：缩放图片中的节点距离

tag-icon • tag-icon tikz-pgf scaling
tikz，定位库：缩放图片中的节点距离

我确实发现定位库中键移位部分中没有维度的数字没有缩放，这很尴尬。我可以检索单位向量并将其用于值中，但我确实发现语法对用户不友好。有没有好的方法告诉 tikz 将“右下方=3 和 3”解释为 3*scaled xvector 而不是 3*xvector？

\documentclass[]{article}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{backgrounds}

\begin{document}


\begin{tikzpicture}[show background rectangle]
\pgfpointtransformed{\pgfpointxy{1}{1}};
\pgfgetlastxy{\xvec}{\yvec}
\tikzset{node distance=\xvec*1 and \yvec*1}


\coordinate (C) at (1,1);
\draw[red,fill] (C) circle (5pt);
\node[below=of C] {no shifting part};
\node[below right=3 and 3,anchor=base west] (A) at (C) {no cm};
\node[below right=3cm and 3cm,anchor=base east] (D) at (C) {cm};
\node[below right=\xvec*3 and \yvec*3,anchor=south] (B) at (C) {scaled};
\draw[red](C)--(A.base west);
\end{tikzpicture}



\begin{tikzpicture}[scale=0.3,show background rectangle]
\pgfpointtransformed{\pgfpointxy{1}{1}};
\pgfgetlastxy{\xvec}{\yvec}
\tikzset{node distance=\xvec*1 and \yvec*1}


\coordinate (C) at (1,1);
\draw[red,fill] (C) circle (5pt);
\node[below=of C] {no shifting part}; %ok
%This should work like in the last node:
\node[below right=3 and 3,anchor=base west] (A) at (C) {no cm}; %not ok
\node[below right=3cm and 3cm,anchor=base east] (D) at (C) {cm}; %ok
\node[below right=\xvec*3 and \yvec*3,anchor=south] (B) at (C) {scaled}; %ok 
\draw[red](C)--(A.base west);
\end{tikzpicture}

\end{document}

答案1

我和我的positioning-plusnode distance该库已经包含一种方法来分解通过存储的值

<direction>=<y-factor> and <x-factor>:of <reference>

node distance=1 and 1对于你的例子来说已经适用了

below right=3 and 3:of C

或

below right=3:of C

我添加了一个小修复，以便它在没有参考的情况下也可以工作，即below right=3 and 3:。

冒号:用作比例因子的分隔符。从技术上讲，可以说2 and 3:2cm and 3cm of <reference>，这是否比有优势4cm and 9cm of <reference>，我不这么认为。

带有前缀的语法s似乎很难解析。

还有一个键node distance transformation（默认值true：），用于激活定位键的变换（类似于transform shape节点）。当然，任何变换都会应用（rotate等等）。

我对 PGF 转换不太有经验，有时觉得它们相当令人困惑，所以我不知道这是否是正确/最佳的方法。

顺便说一句，如果你只想扩展坐标坐标系，您也可以使用默认坐标系x=.3cm, y=.3cm的比例.3。但是，这取决于您的用例以及您首先应用缩放的原因。

代码

\documentclass[tikz]{standalone}
\usetikzlibrary{positioning-plus,backgrounds}
\tikzset{l/.style={
  label={[fill,circle,inner sep=+0pt,minimum size=+2pt,label=right:{#1}]center:}}}
\begin{document}
\begin{tikzpicture}[gridded, node distance=1 and 1]
\draw (0,0) circle[radius=2pt];
\coordinate[l=ref] (C) at (1,1);
\coordinate[below right=1 and 1:,l={1 and 1}] (f1) at (C);
\coordinate[below right=3 and 2:,l={3 and 2}] (f2) at (C);
\end{tikzpicture}
\makeatletter
\begin{tikzpicture}[scale=.3, gridded, node distance=1 and 1,
                                             node distance transformation=true]
\draw (0,0) circle[radius=2pt];
\coordinate[l=ref] (C) at (1,1);
\coordinate[below right=1 and 1:,l={1 and 1}] (f1) at (C);
\coordinate[below right=3 and 2:,l={3 and 2}] (f2) at (C);
\end{tikzpicture}
\end{document}

输出（不按比例）

在此处输入图片描述在此处输入图片描述

答案2

不确定这个答案有多么可取，因为它涉及内部内容，但本质上scale positioning提供了一个关键，如果true中断通常的定位机制，则从变换矩阵中提取缩放并将其应用于定位值，然后继续照常进行。

然而，如果应用缩放以外的变换，可能会发生奇怪的事情。

\documentclass[border=0.125cm]{standalone}

\usepackage{tikz}
\usetikzlibrary{positioning}

\makeatletter

\let\tikz@lib@place@handle@original=\tikz@lib@place@handle@
\def\tikz@lib@place@handle@alternative#1#2#3#4#5#6{%
  % Get transform entries
  \pgfgettransformentries\tikz@a\tikz@b\tikz@c\tikz@d\tikz@e\tikz@f%
  % Get scale
  \pgfpoint{sqrt(\tikz@a*\tikz@a+\tikz@b*\tikz@b)*(\tikz@a<0 ? -1 : 1)}%
    {sqrt(\tikz@c*\tikz@c+\tikz@d*\tikz@d)*(\tikz@d<0 ? -1 : 1)}%
  \pgf@x=#3\pgf@x%
  \pgf@y=#4\pgf@y%
  \edef\tikz@lib@x{\pgfmath@tonumber\pgf@x}%
  \edef\tikz@lib@y{\pgfmath@tonumber\pgf@y}%
  \tikz@lib@place@handle@original{#1}{#2}{\tikz@lib@x}{\tikz@lib@y}{#5}{#6}%
}

\newif\iftikz@lib@place@scale@positioning
\tikzset{%
  scale positioning/.code={%
    \csname tikz@lib@place@scale@positioning#1\endcsname%
    \iftikz@lib@place@scale@positioning%
      \let\tikz@lib@place@handle@=\tikz@lib@place@handle@alternative%
    \else%
      \let\tikz@lib@place@handle@=\tikz@lib@place@handle@original%
    \fi%
  },
  scale positioning/.default=true,
  % Define special keys...
  below right'/.style={scale positioning, below right={#1}}%
  % ...more needed
}

\begin{document}

\begin{tikzpicture}[scale=1, 
  every node/.style={shape=circle},
  every pin edge/.style={<-}, 
  every pin/.style={shape=rectangle},
  mark/.style args={#1 at #2 with #3}{
   draw=#3, dotted,
   pin={[pin edge=#3, #3]#2:#1}
  }]

\fill [blue, opacity=0.25] (0,0) rectangle(5,3);

\coordinate [label=above:$C$] (C) at (0,3);  

\draw [blue, <->] (3,0) -- (C);


\node [below right=3cm and 3cm of C, mark=cm at 260 with blue] {}; 
\node [below right=3 and 3 of C,  mark=vec at 280 with blue] {}; 

\begin{scope}[scale=0.3]

\coordinate [label=left:$C^\prime$] (C') at (0,3);  
\draw [red, <->] (3,0) -- (C');
\fill [red, opacity=0.25] (0,0) rectangle (5,3);

\node [below right=3cm and 3cm of C', mark=cm at 260 with red] {}; 
\node [below right=3 and 3 of C', mark=vec at 280 with red] {}; 

\node [below right=3cm and 3cm of C', dash phase=3.75pt, mark=cm at 220 with green] {}; 

% Scale one positioning using special key.
\node [below right'=3 and 3 of C', dash phase=3.75pt, mark=vec at 320 with green] {};

% Scale everything in a scope.
%
% NB. scale positioning can be used in path options 
% but *must* come before the positioning specification.
\begin{scope}[scale positioning]
\node [below right=3cm and 3cm of C',  mark=cm at 280 with orange] {};
\node [below right=3 and 3 of C',  mark=vec at 260 with orange] {};
\end{scope} 
\end{scope}
\end{tikzpicture}

\end{document}

在此处输入图片描述

相关内容