连接来自不同地块的点对

Question

我有两个散点图来自一个 csv 文件。

no,id,x,y,x_proj,y_proj
1,1,565,417,565.6,393.3
1,2,315,234,334.8,193
1,3,949,355,944.8,346.3

我想链接每个具有相同 ID 的点。有没有简单的方法可以做到这一点？

我所拥有的图片：

我想要的图片：

我目前拥有的代码：

\documentclass{article}
\usepackage{filecontents}
\usepackage{pgfplots}

\begin{document}

\begin{filecontents*}{data.csv}
no,id,x,y,x_proj,y_proj
1,1,565,417,565.6,393.3
1,2,315,234,334.8,193
1,3,949,355,944.8,346.3
\end{filecontents*}

\begin{tikzpicture}
\begin{axis}[
    enlargelimits=false,
    xmin=0, xmax=1280,
    ymin=0, ymax=720,
]
\addplot[
    only marks,
    scatter,
    mark=*,
    mark size=2pt]
    table[meta index=1, col sep=comma, x=x,y=y]{data.csv};
\addplot[
    only marks,
    scatter,
    mark=*,
    mark size=2pt]
    table[meta index=1, col sep=comma, x=x_proj,y=y_proj]{data.csv};
\end{axis}
\end{tikzpicture}

\end{document}

提前致谢，

Answer 1

这可以通过为每个点添加一个坐标来实现。然后您只需连接相应的坐标即可。

有关详细信息，请查看代码中的注释。
（代码根据https://tex.stackexchange.com/a/335625）

% used PGFPlots v1.15
\begin{filecontents*}{data.csv}
no,id,x,y,x_proj,y_proj
1,1,565,417,565.6,393.3
1,2,315,234,334.8,193
1,3,949,355,944.8,346.3
\end{filecontents*}
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
    \pgfplotstableread[col sep=comma]{data.csv}{\loadedtable}
        % store number of data points
        \pgfplotstablegetrowsof{\loadedtable}
        \pgfmathtruncatemacro{\N}{\pgfplotsretval-1}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
%        % (commented to enlarge the distance between the points)
%        enlargelimits=false,
%        xmin=0, xmax=1280,
%        ymin=0, ymax=720,
    ]

        \addplot[
            only marks,
            scatter,
            mark=*,
%            % -------------------------------------------------------------
%            % comment this block to hide names of the coords
%            % -----
%            % just for debugging purposes you can draw the names of the
%            % coordinates to check that everything is right/fine
%            nodes near coords=a\coordindex,
%            % increase the distance of the nodes a bit
%            nodes near coords align={above=1ex},
%            % -------------------------------------------------------------
        ] table [x=x,y=y,meta index=1] {\loadedtable}
            % set a coordinate on each data point
            \foreach \i in {0,...,\N} {
                coordinate [pos=\i/\N] (a\i)
            }
        ;

        \addplot[
            only marks,
            scatter,
            mark=*,
%            % -------------------------------------------------------------
%            nodes near coords=b\coordindex,
%            nodes near coords align={below=1ex},
%            % -------------------------------------------------------------
        ] table [x=x_proj,y=y_proj,meta index=1] {\loadedtable}
            % set a coordinate on each data point
            \foreach \i in {0,...,\N} {
                coordinate [pos=\i/\N] (b\i)
            }
        ;
    \end{axis}

        % now draw the connecting lines
        \foreach \i in {0,...,\N} {
            \draw (a\i) -- (b\i);
        }
\end{tikzpicture}
\end{document}