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如何在相对定位的图像上绘制点网格？

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如何在相对定位的图像上绘制点网格？

我有两张尺寸相同的图像，想在每张图像上添加一个点网格。然后，相应的点应该用一条线连接起来。它应该大致看起来像这样（我只连接了上排和下排的点。）

在此处输入图片描述

\documentclass[demo]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,decorations.pathmorphing}
\begin{document}
\tikz[
    spec/.style={decoration=snake}
]{
    \node[anchor=south west,inner sep=0] (F) at (0,0) {\includegraphics[width=2cm]{image.jpg}};
    \node[above right=of F,anchor=south west,inner sep=0] (B) at (1,0) {\includegraphics[width=2cm]{image.jpg}};
    \begin{scope}[x={(F.south east)},y={(F.north west)}]
        %\draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
        \foreach \x in {1,...,9} {
            \foreach \y in {1,...,9}{
                \node[draw,circle,fill,blue,inner sep=0.5pt] (F\x\y) at (\x/10,\y/10) {};
            }
        }
    \end{scope}
\begin{scope}[x={(B.south east)},y={(B.north west)}]
  \foreach \x in {1,...,9} {
    \foreach \y in {1,...,9}{
      \node[draw,circle,fill,green,inner sep=0.5pt] (B\x\y) at (\x/10,\y/10) {};
      \draw[decoration=snake] (B\x\y)--(F\x\y);
    }
  }
\end{scope}
}
\end{document}

线条看起来不错，但绿点网格不太对劲。我遗漏了什么？

答案1

图层在这里可能很有用。同样使用隐式xyz坐标系：

\documentclass[tikz,margin=5]{standalone}
\usetikzlibrary{backgrounds,decorations.pathmorphing}
\begin{document}
\begin{tikzpicture}[x=(330:1.414cm),y=(90:2cm),z=(210:2cm),line cap=round]
\foreach \layer/\dotcolor [count=\k]  in {background/green, main/blue}{
  \begin{pgfonlayer}{\layer}
  \path [fill=black, fill opacity=0.875]
     (0,0,\k) -- (1,0,\k) -- (1,1,\k) -- (0,1,\k) -- cycle;
  \foreach \i in {1,...,4}\foreach \j in {1,...,4}
    \path [fill=\dotcolor] (\j*.2, \i*.2, \k) circle [radius=.0125]
      coordinate (n-\i-\j-\k);
  \end{pgfonlayer}
}
\begin{pgfonlayer}{background}
\foreach \i in {1,...,4}\foreach \j in {1,...,4}
  \draw [gray, decoration={snake, amplitude=1}, decorate] 
     (n-\i-\j-1) -- (n-\i-\j-2);
\end{pgfonlayer}
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

您正在设置 x 和 y 向量以适应图片。这对第一张图片有效，因为它位于 (0,0)。但对于第二张图片则不然，因为它没有位于原点。绘制向量（参见下面代码中的注释部分）显示了这一点：

在此处输入图片描述

这里您的绿点完美地定位在一个不完美的 1x1“矩形”内。

可以通过在设置向量 xB 和 yB 时减去 B 的锚点来纠正这个问题：

x={($(B.south east) - (B.south west)$)},
y={($(B.north west) - (B.south west)$)}

另外，必须将锚点添加到绿点的位置以将它们移到第二张图片中：

($(\x/10,\y/10) + (B.south west)$)

其结果是：

在此处输入图片描述

代码：

\documentclass[demo,border=1mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,decorations.pathmorphing,calc}
\begin{document}
\tikz[
    spec/.style={decoration=snake}
]{
    \node[anchor=south west,inner sep=0] (F) at (0,0) {\includegraphics[width=2cm]{image.jpg}};
    \node[above right=of F,anchor=south west,inner sep=0] (B) at (1,0) {\includegraphics[width=2cm]{image.jpg}};
    \begin{scope}[x={(F.south east)},y={(F.north west)}]
        %\draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
        \foreach \x in {1,...,9} {
            \foreach \y in {1,...,9}{
                \node[draw,circle,fill,blue,inner sep=0.5pt] (F\x\y) at (\x/10,\y/10) {};
            }
        }
        % draw x and y vector
        %\draw[cyan,->] (0,0) -- (1,0) node[right] {$xF$};
        %\draw[cyan,->] (0,0) -- (0,1) node[above] {$yF$};
    \end{scope}
\begin{scope}[x={($(B.south east) - (B.south west)$)},y={($(B.north west) - (B.south west)$)}]
%\begin{scope}[x={(B.south east)},y={(B.north west)}]
  \foreach \x in {1,...,9} {
    \foreach \y in {1,...,9}{
      \node[draw,circle,fill,green,inner sep=0.5pt] (B\x\y) at ($(\x/10,\y/10) + (B.south west)$) {};
%      \node[draw,circle,fill,green,inner sep=0.5pt] (B\x\y) at (\x/10,\y/10) {};
      \draw[red,decoration=snake] (B\x\y)--(F\x\y);
    }
  }
  % draw x and y vector
  %\draw[cyan,->] (0,0) -- (1,0) node[right] {$xB$};
  %\draw[cyan,->] (0,0) -- (0,1) node[above] {$yB$};
  % lines to show the 1x1 rectangle
  %\draw[cyan] (1,0) -- (1,1);
  %\draw[cyan] (0,1) -- (1,1);
\end{scope}
}
\end{document}

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