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The pgf manual isn't really explicit about it, so i'm here to ask it to the stack communauty. I tried to put some shadow/blur effect around the spyonnode but with no effect at all !

I tried this :

\begin{tikzpicture}[spy using overlays={
            connect spies,
\spy[circular drop shadow,
     spy connection path={
     \draw[thick] (tikzspyonnode) -- (tikzspyinnode);
] on (spypoint) in node at (3.25,-1.35);

Do someone have an idea?

share|improve this question
up vote 13 down vote accepted

You can define your own spy style with the example given in Section 49.5 of PGF/TikZ manual. Here is one such modification with shadowed spy windows.

\tikzset{spy using overlaysshadow/.style={
    spy scope={#1,
         every spy on node/.style={
            fill, fill opacity=0.2, text opacity=1
         every spy in node/.style={
                 circle, circular drop shadow,
                 fill=white, draw, ultra thick, cap=round
\begin{tikzpicture}[spy using overlaysshadow={
    connect spies}
samples=25,domain=0:2,y domain=0:1]
{exp(-x) * sin(pi*deg(y))};
\spy [red] on (2,3cm) in node at (3.5cm,-1.25cm);
\spy [blue,size=1cm] on (3cm,1cm) in node  at (0,-1.25cm);

enter image description here

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Thanks for a so quick answer but it doesn't seem working with my style based on the code in the question: – Rave May 20 '12 at 17:26
@Rave Can you give a small but compilable example that show the problem so that we can look at it together? I can't guess the problem as it is. – percusse May 20 '12 at 17:30
Yes sorry i tried to edit my answer put some picture in it but i wasn't quick enough: !Pic_shadow. The "spy in node" is really to dark compared to the "spy on node" – Rave May 20 '12 at 17:34
@Rave The grayness you see is the shadow itself because the node is not filled. Add fill=white or any other color to fill it. Have a look at the in node style in my answer. – percusse May 20 '12 at 17:39
Already tried but it went copmletly white and with my color it is to dark : !compare white and my color I'm gonna try a fill=mycolor!%!white to see what's gonna happen – Rave May 20 '12 at 17:49

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