我想要在组图中展示具有共同结果范围的结果。当然，我不想在每张图片旁边显示多个颜色条，而是显示一个颜色条
- 在组图上方或下方，从组图的左侧到右侧跨越或
- 组图左侧或右侧，从组图顶部到底部
我让 groupplot 工作得益于此主题。我为颜色条尝试了几种方法，但目前还没有成功：
解决方案尝试 1
基于这个答案。但是高度不正确：
\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}
\pgfmathsetmacro{\xmin}{0}
\pgfmathsetmacro{\xmax}{1.64}
\pgfmathsetmacro{\ymin}{0}
\pgfmathsetmacro{\ymax}{1}
\begin{groupplot}[
group style={
group name=my plots,
group size= 2 by 4,
vertical sep=1.5cm
},
width=7cm,
hide axis,
enlargelimits=false,
axis equal image,
]
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot[
point meta min=0.0,
point meta max=1.0,
colormap/bluered, % Colormap preset
colorbar sampled, % Steps in colorbar
colorbar right,
colorbar style={
separate axis lines,
samples=256, % Number of steps
},
every colorbar/.append style={
height=2*\pgfkeysvalueof{/pgfplots/parent axis height}+
\pgfkeysvalueof{/pgfplots/group/vertical sep}
}
]
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\end{groupplot}
% Labels
\node[below = 0.5cm of my plots c1r1.south] {(a) Timestep 25};
\node[below = 0.5cm of my plots c2r1.south] {(b) Timestep 35};
\node[below = 0.5cm of my plots c1r2.south] {(c) Timestep 45};
\node[below = 0.5cm of my plots c2r2.south] {(d) Timestep 55};
\end{tikzpicture}
\end{document}
给出这个结果：
定义固定高度不会改变结果。有趣的是，我可以使用point meta max=2选项更改颜色栏高度
解决方案尝试 2
基于这个答案我尝试使用节点相对定位：
\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}
\pgfmathsetmacro{\xmin}{0}
\pgfmathsetmacro{\xmax}{1.64}
\pgfmathsetmacro{\ymin}{0}
\pgfmathsetmacro{\ymax}{1}
\begin{groupplot}[
group style={
group name=my plots,
group size= 2 by 4,
vertical sep=1.5cm
},
width=7cm,
hide axis,
enlargelimits=false,
axis equal image,
]
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\coordinate (top) at (rel axis cs:0,1);% coordinate at top of the first plot
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\coordinate (bot) at (rel axis cs:1,0);% coordinate at bottom of the last plot
\end{groupplot}
% Labels
\node[below = 0.5cm of my plots c1r1.south] {(a) Timestep 25};
\node[below = 0.5cm of my plots c2r1.south] {(b) Timestep 35};
\node[below = 0.5cm of my plots c1r2.south] {(c) Timestep 45};
\node[below = 0.5cm of my plots c2r2.south] {(d) Timestep 55};
% Colorbar
\path (top|-current bounding box.north)--
coordinate(legendpos)
(bot|-current bounding box.north);
\begin{axis}[%
hide axis,
scale only axis,
%height=.6\linewidth,
%width=.9\linewidth,
at={(top.north)},
anchor=north west,
point meta min=0.0,
point meta max=2.0,
colormap/bluered, % Colormap preset
colorbar horizontal, % Active colorbar
colorbar sampled, % Steps in colorbar
colorbar style={
separate axis lines,
samples=256, % Number of steps
},
]
\addplot [draw=none] coordinates {(0,0)};
\end{axis}
\end{tikzpicture}
\end{document}
这给了我一个颜色条，但它并不在我期望的位置，并且宽度不是从两个子图的左到右：
对于如何修复颜色条，有什么想法吗？
答案1
好的，第二次尝试后我基本上得到了我想要的结果。但是对于颜色条的宽度和位置，解决方案并不像我希望的那样自动化
\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}
\pgfmathsetmacro{\xmin}{0}
\pgfmathsetmacro{\xmax}{1.64}
\pgfmathsetmacro{\ymin}{0}
\pgfmathsetmacro{\ymax}{1}
\begin{groupplot}[
group style={
group name=my plots,
group size= 2 by 4,
vertical sep=1.5cm
},
width=7cm,
hide axis,
enlargelimits=false,
axis equal image,
]
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\coordinate (top) at (rel axis cs:0,1);% coordinate at top of the first plot
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\nextgroupplot
\addplot graphics [xmin=\xmin,xmax=\xmax,ymin=\ymin,ymax=\ymax]
{example-image-a};
\coordinate (bot) at (rel axis cs:1,0);% coordinate at bottom of the last plot
\end{groupplot}
% Labels
\node[below = 0.5cm of my plots c1r1.south] {(a) Timestep 25};
\node[below = 0.5cm of my plots c2r1.south] {(b) Timestep 35};
\node[below = 0.5cm of my plots c1r2.south] {(c) Timestep 45};
\node[below = 0.5cm of my plots c2r2.south] {(d) Timestep 55};
% Node position middle right groupplot
\path (top-|current bounding box.east)--
coordinate(legendposright)
(bot-|current bounding box.east);
% Node position middle above groupplot
\path (top|-current bounding box.north)--
coordinate(legendposabove)
(bot|-current bounding box.north);
% Node markers
%\node [circle,fill=black,minimum size=10pt] at (legendposright){};
%\node [circle,fill=black,minimum size=10pt] at (legendposabove){};
%Colorbar above
\begin{axis}[%
hide axis,
scale only axis,
height=.01\linewidth,
width=0.975\linewidth,
at={(legendposabove.south)},
yshift=1.25cm,
anchor=south,
point meta min=0.0,
point meta max=2.0,
colormap/bluered, % Colormap preset
colorbar horizontal, % Active colorbar
colorbar sampled, % Steps in colorbar
colorbar style={
separate axis lines,
samples=256, % Number of steps
xticklabel pos=upper
},
%every colorbar/.append style={
% width=\pgfkeysvalueof{/pgfplots/parent axis width}%+
% %\pgfkeysvalueof{/pgfplots/group/vertical sep}
%}
]
\addplot [draw=none] coordinates {(0,0)};
\end{axis}
%Colorbar right
\begin{axis}[%
hide axis,
scale only axis,
%height=0.975\linewidth,
%width=0.01\linewidth,
at={(legendposright.east)},
anchor=east,
xshift=0.25cm,
point meta min=0.0,
point meta max=2.0,
colormap/bluered, % Colormap preset
colorbar right, % Active colorbar
colorbar sampled, % Steps in colorbar
colorbar style={
separate axis lines,
samples=256, % Number of steps
},
every colorbar/.append style={
height=\pgfkeysvalueof{/pgfplots/parent axis height}%+
%\pgfkeysvalueof{/pgfplots/group/vertical sep}
}
]
\addplot [draw=none] coordinates {(0,0)};
\end{axis}
\end{tikzpicture}
\end{document}
结果：
有什么改进想法吗？