填补不当行为？

Question

您几乎已经掌握了。诀窍是使用密钥，然后使用（索引从 0 开始）split填充第二段。every segment no 1/.style

以下代码现在仅包含解决方案的相关部分。

\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
    \usetikzlibrary{
        pgfplots.fillbetween,
    }
\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            xmax=5,
            xmin=0,
            ymax=5,
            ymin=0,
            width=7cm,
            height=7cm,
            no markers,
        ]
            \addplot [
                thick,
                black,
                fill=red,
                fill opacity=0.30,
                name path=A,
            ] coordinates {
                (5, 1)
                (4, 4)
                (1, 5)
                (2, 2)
            }
                -- cycle
            ;
            \addplot+ [
                red,
                thick,
                name path=B,
            ] coordinates {(2, 0) (2, 5)};

            \addplot+ [
                fill=none,
            ] fill between [
                of=A and B,
                split,
                every segment no 1/.style={
                    fill=green,
                },
            ];
        \end{axis}
    \end{tikzpicture}
\end{document}

编辑：

这又是解决方案，但现在经过了修改，您可以看到交点在哪里以及这会产生多少个段。

这很可能不会像你预期的那样工作，但可以通过以下方式解释pgfplots手册 v1.13 第427 页第 5.7.8 节第 3 项

这适用于“正常”情况，您可以使用手册中给出的示例之一亲自尝试。

\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
    \usetikzlibrary{
        patterns,
        pgfplots.fillbetween,
    }
\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            xmin=0,
            xmax=5,
            ymin=0,
            ymax=5,
            clip=false,
        ]
            \addplot [
                thick,
                black,
                name path=A,
            ] coordinates {
                (5, 1)
                (4, 4)
                (1, 5)
                (2, 2)
            }
                node [at start,label={right:start\,=\,end}] (start) {}
                -- cycle
            ;
            \addplot [
                red,
                thick,
                name path=B,
            ] coordinates {(2, 0) (2, 5)};

            % fill all segments with the checkerboard pattern
            % from this can be seen, that there should be 3 segments (0,1,2)
            \addplot [
                pattern=checkerboard,
                pattern color=blue!50,
            ] fill between [
                of=A and B,
            ];
            % now we try to fill them separately
            \addplot [
                fill=none,
            ] fill between [
                of=A and B,
                split,
                % works
                every segment no 0/.style={
                    fill=red!50,
                    opacity=0.5,
                },
                % works
                every segment no 1/.style={
                    fill=green!50,
                    opacity=0.5,
                },
                % doesn't work
                % this is most probably because path A intersects with itself;
                % see section 5.7.8 «Pitfalls and Limitations» on page 427
                % in the manual v1.13
%                every segment no 2/.style={% <-- equivalent to next line
                every last segment/.style={
                    fill=yellow!50,
                },
            ];

            % show the intersections of the pathes which show together with
            % the start/end point(s) the beginning/end of the segments
            \draw [
                name intersections={
                    of=A and B,
                    name=i,
                    total=\t,
                },
                black,
                every node/.style={
                    above left,
                    black,
                    opacity=1,
                }
            ]
            \foreach \s in {1,...,\t}{
                (i-\s) circle (2pt) node {\footnotesize\s}
            };

        \end{axis}
            \fill [red,radius=2pt] (start) circle;
    \end{tikzpicture}
\end{document}

Answer 1