根节点和子节点之间的思维导图颜色阴影未使用正确的颜色

Question

我正在尝试在 中创建思维导图tikz，但当我将根节点的颜色定义为不同于“默认颜色”时，出现了问题。主要是，根节点和其子节点之间的连接没有使用正确的颜色，如下图所示。我该如何解决这个问题？

这是 MWE：

\documentclass[border = 3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty} % Clear page

\begin{document}
    \begin{tikzpicture}[% Tikz picture options and styles on midmap
        mindmap, 
        every node/.style={concept, execute at begin node=\hskip0pt},
        root concept/.append style={
            concept color=gray,text width = 3cm},
        concept color = yellow, % Default node color
        text = white,                   % Default text color
        grow cyclic,
        level 1/.append style={level distance=6cm,sibling angle=60},
        level 2/.append style={level distance=3cm,sibling angle=90},
        level 3/.append style={level distance=3cm,sibling angle=90},
        ]
        
        \node[root concept]{Hello!}
        child[concept color=red]  { node {This is a red node}
        }
        child [concept color=blue]{ node{This is a blue node}
            child[concept color=orange]{node{This is a orange node}}
            child[concept color=green]{node{This is a green node}}
        };
        
    \end{tikzpicture}
\end{document}

可能与这个问题有关，但我发现xcolor包中的某些颜色也有这种奇怪的行为。例如，考虑以下使用青色的图像：

回答相应的代码：

\documentclass[border = 3mm]{standalone}
\usepackage{xcolor}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty} % Clear page

\begin{document}
    \begin{tikzpicture}[% Tikz picture options and styles on midmap
        mindmap, 
        every node/.style={concept, execute at begin node=\hskip0pt},
        root concept/.append style={
            concept color=gray,text width = 3cm},
        concept color = yellow, % Default node color
        text = white,                   % Default text color
        grow cyclic,
        level 1/.append style={level distance=6cm,sibling angle=60},
        level 2/.append style={level distance=3cm,sibling angle=90},
        level 3/.append style={level distance=3cm,sibling angle=90},
        ]
        \clip (0,-1) rectangle ++(8,7);
        \node[root concept]{Hello!}
        child[concept color=red]  { node {This is a red node}
        }
        child [concept color=cyan]{ node{This is a cyan node}
            child[concept color=orange]{node{This is a orange node}}
            child[concept color=green]{node{This is a green node}}
        };
        
    \end{tikzpicture}
\end{document}

Answer 1

像这样 ？

\documentclass[border = 3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty}

\begin{document}
\begin{tikzpicture}[
    mindmap, 
    every node/.style={concept, execute at begin node=\hskip0pt},
    root concept/.append style={concept color=gray, text width=3cm},
    concept color=yellow, % Default node color
    text=white, % Default text color
    grow cyclic,
    level 1/.append style={level distance=6cm, sibling angle=60},
    level 2/.append style={level distance=3cm, sibling angle=45},
    level 3/.append style={level distance=3cm, sibling angle=45},
]
\node[root concept] (root) {Hello!} % Root node
    child [concept color=red] { node (red) {This is a red node} }
    child [concept color=blue] { node (blue) {This is a blue node}
        child [concept color=orange] { node (orange) {This is an orange node} }
        child [concept color=green] { node (green) {This is a green node} }
    };

% you add manually the connections with the right colors
\path (root) to [circle connection bar switch color=from (gray) to (red)] (red);
\path (root) to [circle connection bar switch color=from (gray) to (blue)] (blue);
\path (blue) to [circle connection bar switch color=from (blue) to (orange)] (orange);
\path (blue) to [circle connection bar switch color=from (blue) to (green)] (green);
\end{tikzpicture}
\end{document}