Horizontal alignment of figures

[kendonB]

Hi, I would like to know if it's possible to adjust the horizontal alignment of figures in knitr beyond fig.align? I would like to be able to make the following plot align so that the gray graph panel is centered with the paragraphs. Thanks so much for any help.

\documentclass{article}
\usepackage[margin=1in]{geometry}
\begin{document}
\noindent Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph...
<<echo=FALSE, fig.align='center', fig.height=6, fig.width=6>>=
library(ggplot2)
bp <- ggplot(data=PlantGrowth, aes(x=group, y=weight, fill=group)) + geom_boxplot()
bp    
@
\noindent Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph. Here is a paragraph. Here is a paragraph.
Here is a paragraph...  
\end{document}

[yihui]

I'm afraid the best advice I could offer at the moment is to put the legend at the bottom or top of the graph: http://docs.ggplot2.org/current/theme.html (search for legend.position on the page) knitr does not allow arbitrary position of the plot directly, although you can always hack the plot hook (if you understand what this means...)

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