如何让具有相同状态的多条故事线不互相重叠？

Question

我有一个简单的情节，包含两行：

\nextgroupplot[
    no markers,
    ymin=-0.25,
    ymax=2.25,
    ytick={0, 1, 2},
    yticklabels={state one, other state ,third state},
]

\addplot+ [
        const plot mark right,
        % name this path to later be able to find an intersection on it
        name path=first,
    ] coordinates { (0,0) (200,0) (300,1) (500,2) };
   \addplot+ [
        const plot mark right,
        % name this path to later be able to find an intersection on it
        name path=second,
    ] coordinates { (0,1) (150,0) (250,1) (250,2) (450,2) (500, 1) };

看起来像：

我希望当它们具有相同状态时，这些线条堆叠在一起（使线条看起来变得更粗）：

（如果有 100 条线，它会变得更高，如果线条更粗，它看起来就像彩虹线 =））

如何使用 tikz 和 pgf 来实现？

Answer 1

我想不会有自动的在 LaTeX（及其同类产品）中，跟踪线条重叠的时间，并仅在重叠区域相应地移动它们。这就是为什么建议只移动所有的線。

有关更多详细信息，请查看代码中的注释。

% used PGFPlots v1.14
% (this is an answer to the follow-up question of 
%  <http://tex.stackexchange.com/q/357358>)
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        width=10cm,
        height=2cm,
        scale only axis,
        axis lines=left,
        xmin=0,
        xmax=500,
        no markers,
        ymin=-0.25,
        ymax=2.25,
        ytick={0, 1, 2},
        yticklabels={state one, other state ,third state},
        % (moved common `\addplot' options here)
        const plot mark right,
    ]
            % -----------------------------------------------------------------
            % for now please ignore these commands.
            % (Later it will be referenced and then you can/should read the
            %  comments on these commands)
            % -----------------------------------------------------------------
            % define a variable to count the number of `\addplot's
            % and initialize it here to zero
            \pgfmathtruncatemacro{\PlotNum}{0}
            % -----------------------------------------------------------------
        \addplot+ [
            % -----------------------------------------------------------------
            % please skip this option too, if you first come here
            % -----------------------------------------------------------------
            % of course this option should be used at *every* `\addplot'
            % command, also the first one. This has the advantage that you
            % could also apply a negative number to the initial value of
            % `\PlotNum', so that the "middle" `\addplot' command is at the
            % same height as the corresponding `yticks'
            yshift=\PlotNum*\pgflinewidth,
            % -----------------------------------------------------------------
        ] coordinates { (0,0) (200,0) (300,1) (400,2) (500,0) };

            % now just increase the value by one each time a new `addplot' follows
            \pgfmathtruncatemacro{\PlotNum}{\PlotNum+1}
        \addplot+ [
            % when you don't change the linewidth, you can simply shift the
            % plot by the (default/set) linewidth
            yshift=\pgflinewidth,
%            % (for the default linewidth `thin' this would be 0.4pt, as is
%            %  written in the pgfmanual (v3.0.1a) in section 15.3.1 (on page 166))
%            yshift=0.4pt,
        ] coordinates { (0,1) (150,0) (450,2) (500, 1) };

            \pgfmathtruncatemacro{\PlotNum}{\PlotNum+1}
        \addplot+ [
            green,
%            % with changing `linewidth' one would have to do a manual approach
%            % like the following ...
%            % -----
%            thick,
%            % half linewidth of the first `\addplot'
%            % + sum of all linewidth of the "middle" `\addplot's
%            % + half the linewidth of this `\addplot'
%            yshift=0.2pt + 0.4pt + 0.4pt,
            % -----------------------------------------------------------------
%            % ... but if the `linewidth' doesn't change you can simply do ...
%            yshift=\plotnum*\pgflinewidth,
            % ... which unfortunately doesn't work, because in this context
            % `\plotnum' doesn't seem to be not known. This is, why we simulate
            % this by  defining `\PlotNum' which can be found before each
            % `\addplot' command and use it here
            yshift=\PlotNum*\pgflinewidth,
        ] coordinates { (0,1) (100,0) (250,1) (350,2) (500, 0) };

    \end{axis}
\end{tikzpicture}
\end{document}