pgfplots 中的颜色图列表选项

Question

我正在尝试绘制一个被灯光照亮的房间，所以我走到这一步，但我不知道颜色图有什么选择

\documentclass[border=0.2cm]{standalone}
 
\usepackage{pgfplots}
\usepgfplotslibrary{colormaps}
 
\pgfplotsset{compat = newest}
 
\begin{document}

\begin{tikzpicture}[scale=0.25]
\begin{axis}[
    axis equal image,
    grid = both,
    minor tick num = 2,
    xlabel = {$x$},
    ylabel = {$y$},
    zlabel = {$z$},
    major grid style = {draw = lightgray},
    minor grid style = {draw = lightgray!25},
    legend cell align={left},
    ymin = -1, ymax = 1,
    xmin = -1, xmax = 1,
    scale = 3,
    zmin = 0, zmax = 1.1,
    z buffer = sort,
]
 
% top of the cone
\addplot3[
    surf,
    shader = interp,
    samples = 50,
    samples y = 5,
    domain = 0:2*pi,
    domain y = 0:1,
    opacity = 0.65,
    colormap/yellowwhite,
]
(
    {(cos(deg(x)))*(1-y)},
    {(sin(deg(x)))*(1-y)},
    {y}
);
 

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

Answer 1

这一切都解释在手册：

第四章：参考资料
→标记、线条样式、（背景）颜色和色彩图
→色彩地图

这是手册第 195 页，标签为“修订版 1.18.1 (2021/05/15)”。例如，您可以定义一个颜色图并为其命名：

\pgfplotsset{
  colormap={my colormap}{rgb=(0,0,1) color=(black) rgb255=(238,140,238)},
}

然后将其与 一起使用colormap name=my colormap。

\documentclass[border=0.2cm]{standalone}
\usepackage{pgfplots}

\pgfplotsset{
  compat=1.18,
  colormap={my colormap}{rgb=(0,0,1) color=(black) rgb255=(238,140,238)},
}

\begin{document}

\begin{tikzpicture}[scale=0.25]
\begin{axis}[
    axis equal image,
    grid = both,
    minor tick num = 2,
    xlabel = {$x$},
    ylabel = {$y$},
    zlabel = {$z$},
    major grid style = {draw = lightgray},
    minor grid style = {draw = lightgray!25},
    legend cell align={left},
    ymin = -1, ymax = 1,
    xmin = -1, xmax = 1,
    scale = 3,
    zmin = 0, zmax = 1.1,
    z buffer = sort,
]

\addplot3[
    surf,
    shader = interp,
    samples = 50,
    samples y = 5,
    domain = 0:2*pi,
    domain y = 0:1,
    opacity = 0.65,
    colormap name=my colormap,
  ]
  (
      {(cos(deg(x)))*(1-y)},
      {(sin(deg(x)))*(1-y)},
      {y}
  );
\end{axis}

\end{tikzpicture}
\end{document}

你想要的可能看起来像这样：

\pgfplotsset{
  colormap={yellowwhite}{rgb=(1,1,0) rgb=(1,1,0.8) rgb=(1,1,1)},
}

...

\addplot3[..., colormap name=yellowwhite] (...); ...

预定义的颜色图，\usepgfplotslibrary{colormaps}当不是已使用，是viridis和hot（默认）。如果加载库，则还有pgfplots colormaps更多颜色图可供使用：autumn，，，，，，，，，等：请参阅bledbrightbonecoldcoppercopper2earth手册在下面相关库→色彩图（我的版本第 430 页）。

带有颜色图的示例hsv2。请注意\pgfplotsset{colormap/hsv2}加载它的顺序；然后它可以与一起使用colormap name=hsv2（当然，您可以在可选参数colormap/hsv2中使用而根本\addplot3不执行此操作\pgfplotsset{colormap/hsv2}，但如果您在同一文档中多次使用此颜色图，效率会较低）。

\documentclass[border=0.2cm]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{colormaps}
\pgfplotsset{compat=1.18}

\pgfplotsset{colormap/hsv2} % <-------- this loads the 'hsv2' color map

\begin{document}

\begin{tikzpicture}[scale=0.25]
\begin{axis}[
    axis equal image,
    grid = both,
    minor tick num = 2,
    xlabel = {$x$},
    ylabel = {$y$},
    zlabel = {$z$},
    major grid style = {draw = lightgray},
    minor grid style = {draw = lightgray!25},
    legend cell align={left},
    ymin = -1, ymax = 1,
    xmin = -1, xmax = 1,
    scale = 3,
    zmin = 0, zmax = 1.1,
    z buffer = sort,
]

\addplot3[
    surf,
    shader = interp,
    samples = 50,
    samples y = 5,
    domain = 0:2*pi,
    domain y = 0:1,
    opacity = 0.65,
    % or 'colormap/hsv2', but this is less efficient
    colormap name=hsv2,
  ]
  (
      {(cos(deg(x)))*(1-y)},
      {(sin(deg(x)))*(1-y)},
      {y}
  );

\end{axis}

\end{tikzpicture}
\end{document}