[R] Grid unit width and font face

[Prof Brian Ripley]

I think you are doing this in the wrong order.  You need to set the 
gpar on the viewport, then compute the grid.rect.

> grid.rect(width=unit(1,'strwidth','Some text'),draw=T, gp=gpar(font=2))
> grid.text('Some text',y=0.4,gp=gpar(font=2),draw=T)

is one way to do it: pushing a viewport is another.

The factor does depend on the font, family, pointsize, but see e.g.

> strwidth('Some text', units='in')
[1] 0.7503255
> strwidth('Some text', units='in', font = 2)
[1] 0.7965495


On Fri, 12 Aug 2011, Sébastien Bihorel wrote:

> Dear R-users,
>
> When one defines a grid unit object using the 'strwidth' dimension, it
> seems that the default plain font is assumed as the following example
> illustrates. Is there a way to either make use of a font option when
> creating a unit object or to know the factor that exists between the
> width of the same text printed in plain and in bold? This might be
> dependent on the font, though...
>
> require(grid)
>
> grid.rect(width=unit(1,'strwidth','Some text'),draw=T)
>
> grid.text('Some text',draw=T)                                   # fits
> nicely in the box
> grid.text('Some text',y=0.4,gp=gpar(font=2),draw=T)  # partially outside the box
>
> Thank you in advance for your input on this issue.
>
> Sebastien
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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