使用用户定义的颜色图进行冲浪图绘制

Question

我想surf用我的 colormap制作 PGFPlots rainbow。有趣的是，我得到了错误

我不知道密钥“/pgfplots/colormap/rainbow”，我将忽略它。也许你拼错了。

尽管出现错误，但我的颜色图实际上已被使用！我猜是语法问题，但我无法找出原因。请帮忙。

梅威瑟：

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

\begin{filecontents}{surfdata.dat}
 0 0 0.8
 1 0 0.56
 2 0 0.5
 3 0 0.75

 0 2 0.6
 1 2 0.3
 2 2 0.21
 3 2 0.3

 0 4 0.68
 1 4 0.22
 2 4 0.25
 3 4 0.4

 0 6 0.7
 1 6 0.5
 2 6 0.58
 3 6 0.9
\end{filecontents}

\pgfplotsset{
/pgfplots/colormap={rainbow}{rgb255(0cm)=(96,0,96) rgb255(1cm)=(0,0,192) rgb255(2cm)=(0,160,160) rgb255(3cm)=(96,255,0) rgb255(4cm)=(255,255,0) rgb255(5cm)=(255,192,0) rgb255(6cm)=(255,0,0)}}

\begin{document}
\begin{tikzpicture}
\begin{axis}[view={0}{90}]
  \addplot3[surf,colormap/rainbow] file {surfdata.dat};
\end{axis}
\end{tikzpicture}

Answer 1

你几乎做对了。有关更多详细信息，请查看代码中的注释。

% used PGFPlots v1.14
    \begin{filecontents}{surfdata.dat}
        0 0 0.8
        1 0 0.56
        2 0 0.5
        3 0 0.75

        0 2 0.6
        1 2 0.3
        2 2 0.21
        3 2 0.3

        0 4 0.68
        1 4 0.22
        2 4 0.25
        3 4 0.4

        0 6 0.7
        1 6 0.5
        2 6 0.58
        3 6 0.9
    \end{filecontents}
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{
    % by defining the colormap, it will also immideatly be loaded ...
    colormap={rainbow}{
        rgb255(0cm)=(96,0,96)
        rgb255(1cm)=(0,0,192)
        rgb255(2cm)=(0,160,160)
        rgb255(3cm)=(96,255,0)
        rgb255(4cm)=(255,255,0)
        rgb255(5cm)=(255,192,0)
        rgb255(6cm)=(255,0,0)
    },
}
\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            view={0}{90},
        ]
            \addplot3 [
                surf,
%                % ... that is, why you don't need to provide it here (again)
%                % but this would also be the wrong syntax
%                colormap/rainbow
            ] file {surfdata.dat};
        \end{axis}
    \end{tikzpicture}
    \begin{tikzpicture}
        \begin{axis}[
            view={0}{90},
            % right would either be calling the defined colormap here as ...
            % colormap name=viridis,
        ]
            \addplot3 [
                surf,
                % ... or here (with the same syntax)
                colormap name=hot,
            ] file {surfdata.dat};
        \end{axis}
    \end{tikzpicture}
        % change the default used colormap to `hot'
        \pgfplotsset{colormap name=hot}%
    \begin{tikzpicture}
        \begin{axis}[
            view={0}{90},
            % using "your" syntax is for calling predefined styles
            % which incorporate the defined colormaps.
            % Thus, if failed in your case, because you didn't define a style,
            % but just a colorbar ...
            %
            % This now just *defines* the style, but does not apply it so far
            colormap/rainbow/.style={
                colormap name=rainbow,
            },
%            % uncomment the next line to apply the previously defined style
%            colormap/rainbow,
        ]
            \addplot3 [surf] file {surfdata.dat};
        \end{axis}
    \end{tikzpicture}
\end{document}