Shadows, image externalization and bounding boxes

[fbouchez]

As far as I understood, the blurred shadows do not extend the bounding box of the picture. In my case, I need to externalize tikz pictures. However, the shadows are "cropped" for nodes that are near the bottom or the right of the picture.

I currently use a macro to extend the current bounding box but : 1- I need to manually choose the dimensions 2- those dimensions change if the scale of the picture is changed 3- not all pictures have a node at the bottom or the right

Is there a way to include the shadows in the bounding box ?

Thanks

[fbouchez]

Note that I now include the zoom factor so that it works for any scale. But I still need to manually set the dimensions used to increase the bounding box (shadow x/yshift + shadow radius).

\newcommand{\getzoomfactor}{% \pgfgettransformentries{\myxscale}{\@tempa}{\@tempa}{\myyscale}{\@tempa}{\@tempa} \gdef\zoomfactor{\myxscale} } \newcommand\increase@boundingbox[1]{% \path [use as bounding box] (current bounding box.south east) ++ (#1);% } \newcommand\increase@shadowboundingboxgen[2]{% %% blurred shadows \getzoomfactor% \def\xinc{0}% \ifnum#1>0% \def\xinc{1.1ex/\zoomfactor-\pgflinewidth/2/\zoomfactor}% \fi% \ifnum#2>0% \def\yinc{-0.9ex/\zoomfactor+\pgflinewidth/2/\zoomfactor}% \fi% \increase@boundingbox{\xinc,\yinc}% }

\newcommand\increaseshadowboundingbox{% \increase@shadowboundingboxgen{1}{1}% } \newcommand\increasebottomshadowboundingbox{% \increase@shadowboundingboxgen{0}{1}% } \newcommand\increaserightshadowboundingbox{% \increase@shadowboundingboxgen{1}{0}% }

[norbusan]

The current code restores the original bounding box, that is true. When removing the restore code I get an image like this: from the code

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{shadows.blur}
\usetikzlibrary{backgrounds}
\begin{document}
\begin{tikzpicture}[inner frame sep=0mm,framed]
\node[fill=white, draw=red, blur shadow] at (4,0.5) {Node};
\end{tikzpicture}
\end{document}

I guess you would like to have that in this case the left and top bb is as with the original, and only the lower and right bb is adjusted, correct?

[fbouchez]

Correct :-)

[norbusan]

Hmmm, tricky ... because one can throw the shadow in arbitrary directions ... need to think about it (it is not my code - I just maintain it now)

[norbusan]

And in addition, if the shadow protrudes over the top edge, it should not be cut off, of course ...