如何淡化曲线网格的颜色

Question

我想绘制如下图所示的曲线网格。

请帮我用腹部控制网格并淡化颜色。

平均能量损失

\documentclass[tikz]{standalone}
\begin{document}   
\begin{tikzpicture}
\foreach[count=\j] \i in {3,3.5,...,10.5}{
  \pgfmathsetmacro{\xb}{0.4-0.05*\j}
  \pgfmathsetmacro{\yb}{11-0.01*\j}
  \pgfmathsetmacro{\xc}{7-0.3*\j}
  \pgfmathsetmacro{\opa}{100-0.5*\j}
  
  \draw[thick,cyan!\opa] (\i,27) .. controls +(270:6) and +(80:4.5)..
     (\xb,\yb)..controls +(260:4.5) and +(75:4.6)..(\xc,0);
}
\end{tikzpicture}
\end{document}
  

2021 年 5 月 11 日更新，彩虹色代码

\documentclass[tikz]{standalone}
\begin{document}   
\def\n{30}
\begin{tikzpicture}
\foreach[count=\j] \i in {3,3.5,...,10.5}{
  \pgfmathsetmacro{\xb}{0.4-0.05*\j}
  \pgfmathsetmacro{\yb}{11-0.01*\j}
  \pgfmathsetmacro{\xc}{7-0.3*\j}
  \pgfmathsetmacro{\opa}{100-0.5*\j}
  \pgfmathsetmacro{\faktor}{(\j-1)*400/\n+350}
          \definecolor{rainbow}{wave}{\faktor}
          \draw[ultra thick,rainbow] (\i,27) .. controls +(270:6) and +(80:4.5)..
                   (\xb,\yb)..controls +(260:4.5) and +(75:4.6)..(\xc,0);
}
\end{tikzpicture}
\end{document}

Answer 1

您的代码修改如下：

\documentclass[tikz]{standalone}
\begin{document}   
    \begin{tikzpicture}
        \foreach[count=\j] \i in {3,3.5,...,10.5}{
             \pgfmathsetmacro{\xb}{0.4-0.05*\j}
            \pgfmathsetmacro{\yb}{11-0.01*\j}
            \pgfmathsetmacro{\xc}{7-0.3*\j}     
            \pgfmathsetmacro{\k}{int(\j*100/16)}
            \draw[thick,cyan!\k] (\i,27) .. controls +(270:6) and +(80:4.5)..
            (\xb,\yb)..controls +(260:4.5) and +(75:4.6)..(\xc,0);
        }
    \end{tikzpicture}
\end{document}

你会得到这样的结果：