切换图表中的颜色

Question

有什么办法可以切换此图表的颜色吗？目前，较低的值为蓝色，较高的值为红色。有没有简单的方法可以做到这一点？

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[view={60}{30}]
    \addplot3 [
    mesh,
    z buffer=sort,
    samples=20,
    domain=-1:0,
    y domain=0:2*pi,
    ] (
    {sqrt(1-x^2) * cos(deg(y))},
    {sqrt( 1-x^2 ) * sin(deg(y))},
    x
    );
\end{axis}
\end{tikzpicture}
\end{document}

Answer 1

基于这个答案. 该色彩图称为hot。

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15} % ADDED
\usepgfplotslibrary{colormaps} % ADDED
\begin{document}
\begin{tikzpicture}
\pgfplotsset{colormap/hot} % ADDED
\begin{axis}[view={60}{30},colormap={reverse hot}{indices of colormap={\pgfplotscolormaplastindexof{hot},...,0 of hot}}] % ADDED
    \addplot3 [
    mesh,
    z buffer=sort,
    samples=20,
    domain=-1:0,
    y domain=0:2*pi,
    ] (
    {sqrt(1-x^2) * cos(deg(y))},
    {sqrt( 1-x^2 ) * sin(deg(y))},
    x
    );
\end{axis}
\end{tikzpicture}
\end{document}

Answer 2

point metaMyles 的回答已经非常优雅和简短了，但可以说，从默认值反转z为甚至更短-z。

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[view={60}{30}]
    \addplot3 [
    mesh,
    z buffer=sort,
    samples=20,
    domain=-1:0,
    y domain=0:2*pi,point meta=-z
    ] (
    {sqrt(1-x^2) * cos(deg(y))},
    {sqrt( 1-x^2 ) * sin(deg(y))},
    x
    );
\end{axis}
\end{tikzpicture}
\end{document}