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TikZ：图像上的复杂蒙版（偶数奇数规则）

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TikZ：图像上的复杂蒙版（偶数奇数规则）

我需要在图像上绘制各种形状的蒙版。例如，我制作了一个圆形蒙版，如下所示：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\definecolor{background}{HTML}{2C414C}
\definecolor{foreground}{HTML}{FFFFFF}
\usetikzlibrary{positioning,fit}
\begin{document}
\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule]
    (image.north west) rectangle (image.south east) % Cover up everything
    (0,1) circle [radius=50pt]; % Punch a hole
\end{tikzpicture}
\end{document}

掩码示例

如何使用更复杂的形状代替圆形？具体来说，我需要一个心形。我尝试使用这个答案，但它要么导致错误，要么根本不出现：

\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule]
    (image.north west) rectangle (image.south east)
    (0,1) draw .. controls (0,0.75) and (-1.5,1.00) .. (-1.5,2)  arc (180:0:0.75)  -- cycle;
    (0,1) draw .. controls (0,0.75) and ( 1.5,1.00) .. ( 1.5,2)  arc (0:180:0.75) -- cycle;
\end{tikzpicture}

错误：! Use of \@next doesn't match its definition.

答案1

仅用一条路径绘制心形：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\definecolor{background}{HTML}{2C414C}
\definecolor{foreground}{HTML}{FFFFFF}
\usetikzlibrary{positioning,fit}
\begin{document}
\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule]
    (image.north west) rectangle (image.south east)
    (0,1) .. controls (0,1.75) and (-1.5,2.00) .. (-1.5,3)  arc (180:0:0.75)  arc (180:0:0.75)
    .. controls ( 1.5,2.00) and (0,1.75) .. (0,1) --cycle;
\end{tikzpicture}
\end{document}

在此处输入图片描述

使用哈特定义中的相对坐标，可以更轻松地将其放置在图像上的任何位置：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\definecolor{background}{HTML}{2C414C}
\definecolor{foreground}{HTML}{FFFFFF}
\usetikzlibrary{positioning,fit}

\newcommand{\hart}{.. controls +(0,.75) and +(0,-1.00) .. ++(-1.5,2)  arc (180:0:0.75) arc (180:0:0.75)
    .. controls +(0,-1.00) and +(0,.75) .. cycle}

\begin{document}
\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule]
    (image.north west) rectangle (image.south east)
    {[rotate=90, scale=.5](image.center)\hart} 
    {[scale=1.5](image.center)\hart}
    {[rotate=-50]([shift={(1,2)}]image.south west)\hart};
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

看来，两次都draw太多;了。

在此处输入图片描述

\documentclass[border=10pt, tikz]{standalone}
\usepackage{tikz}
\definecolor{background}{HTML}{2C414C}
\definecolor{foreground}{HTML}{FFFFFF}
\usetikzlibrary{positioning,fit}

\begin{document}

\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule]
    (image.north west) rectangle (image.south east) % Cover up everything
    (0,1) circle [radius=50pt]; % Punch a hole
\end{tikzpicture}

\begin{tikzpicture}[inner sep=0pt, outer sep=0pt, draw=foreground, fill=foreground]
  \node (image) {\includegraphics{example-image}};
  \fill [red, opacity=0.5,even odd rule,]
   (image.north west) rectangle (image.south east)
(0,1) .. controls (0,0.75) and (-1.5,1.00) .. (-1.5,2)  arc (180:0:0.75)  -- cycle
(0,1) .. controls (0,0.75) and ( 1.5,1.00) .. ( 1.5,2)  arc (0:180:0.75) -- cycle;
\end{tikzpicture}

\end{document}

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