
Problema
Copiei algum código deaquieaquie combinei as melhores peças para o meu trabalho. Estou me perguntando por que as coordenadas do meu retângulo estão em porcentagens da imagem, enquanto as coordenadas da luneta não estão.
Exemplo de trabalho
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{spy}
\begin{document}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1.5cm, connect spies}]
\node [anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[height=10cm]{tux}};
\begin{scope}[x={(image.south east)},y={(image.north west)}]
\draw[red,ultra thick,rounded corners] (0.62,0.65) rectangle (0.78,0.75);
\spy on (4.5,7) in node [] at (3,5);
\draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
\foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
\foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
\end{scope}
\end{tikzpicture}
\end{document}
Segunda tentativa
Neste exemplo, tentei colocar o spy using outlines={circle,red,magnification=5,size=1.5cm, connect spies}
dentro dos \begin{scope}
parâmetros, mas não funcionou. A imagem foi ampliada no local errado. Minha ideia veio do pgfmanual (68 Spy Library: Magnifying Parts of Pictures p.746 of v.3.0.0), mas, infelizmente! Não funcionou.
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{spy}
\begin{document}
\begin{tikzpicture}[]
\node [anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[height=10cm]{tux}};
\begin{scope}[x={(image.south east)},y={(image.north west)},spy using outlines={circle,red,magnification=5,size=1.5cm, connect spies}]
\draw[red,ultra thick,rounded corners] (0.62,0.65) rectangle (0.78,0.75);
\spy on (4.5,7) in node [] at (3,5);
\draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
\foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
\foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
\end{scope}
\end{tikzpicture}
\end{document}
Responder1
\spy
usa o sistema de coordenadas no escopo da spy using outlines
opção. Para usar seu sistema de coordenadas especial para espionar sua imagem, você pode definir coordenadas nomeadas.
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{spy}
\begin{document}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=3,size=2.5cm, connect spies}]
\node [anchor=south west,inner sep=0] (image)
at (0,0) {\includegraphics[height=10cm]{example-image}};
\begin{scope}[x={(image.south east)},y={(image.north west)}]
\draw[red,ultra thick,rounded corners] (0.62,0.65) rectangle (0.78,0.75);
\coordinate (pos spy) at (.2,.2);
\coordinate (center) at (.5,.5);
\spy on (center) in node [] at (pos spy);
\draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
\foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
\foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
\end{scope}
\end{tikzpicture}
\end{document}