TikZ：使用 filldraw 和 let in 语法

Question

当我使用语法时，如何\filldraw填充楔子\filldraw let .. in？

\documentclass[convert = false]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}
  \filldraw[inner color = blue!50!, outer color = blue!10!black] let
    \p0 = (0, 0),
    \p1 = (1, 0),
    \p2 = (.707, .707),
    \n1 = {atan2(\x1 - \x0, \y1 - \y0)},
    \n2 = {atan2(\x2 - \x0, \y2 - \y0)},
    \n3 = {1cm}
  in (0, 0) +(\n1:\n3) arc[radius = \n3, start angle = \n1, end angle = \n2];
\end{tikzpicture}
\end{document}

我想要实现的是：

\filldraw其中使用方式如下：

\filldraw[inner color = blue!50!, outer color = blue!10!black] (2.5, 0) --
  +(.5, 0) arc (0:35.2644:.5cm);

Answer 1

您缺少--构建路径（我只是为了示例而更改了比例）：

\documentclass[convert = false]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[scale=5]
  \filldraw[inner color = blue!50!, outer color = blue!10!black] let
    \p0 = (0, 0),
    \p1 = (1, 0),
    \p2 = (.707, .707),
    \n1 = {atan2(\x1 - \x0, \y1 - \y0)},
    \n2 = {atan2(\x2 - \x0, \y2 - \y0)},
    \n3 = {1cm}
  in (\p0) -- +(\n1:\n3) arc[radius = \n3, start angle = \n1, end angle = \n2];
\end{tikzpicture}
\end{document}

-- cycle当填充（filldrawing）时，我总是喜欢在路径的末尾使用，如下所示：

\begin{tikzpicture}[scale=5]
  \filldraw[inner color = blue!50!, outer color = blue!10!black] let
    \p0 = (0, 0),
    \p1 = (1, 0),
    \p2 = (.707, .707),
    \n1 = {atan2(\x1 - \x0, \y1 - \y0)},
    \n2 = {atan2(\x2 - \x0, \y2 - \y0)},
    \n3 = {1cm}
  in (\p0) -- +(\n1:\n3) arc[radius = \n3, start angle = \n1, end angle = \n2] -- cycle;
\end{tikzpicture}