The only other current possibility I know of is by producing grid graphics output in SVG format. A simple example ...
library(grid) # Get from http://www.stat.auckland.ac.nz/~paul/ library(gridSVG) # Important push.viewport(viewport(gp=gpar(col="black", fill=NA))) grid.circle(x=0.4, r=0.3, gp=gpar(fill="green", alpha=0.3)) grid.circle(x=0.6, r=0.3, gp=gpar(fill="red", alpha=0.3)) # Important pop.viewport() # Produce files test.svg and test.svg.html # test.svg.html can be viewed by, e.g., Adobe SVG Viewer 3.0 in IE gridToSVG("test.svg")
Of course, you have to use grid, and gridSVG (which is very experimental), and you only get SVG, so it depends on how badly you want transparency.
Paul
Prof Brian Ripley wrote:
Yes, but currently only alpha=0 and alpha=255 are supported by the available devices that I know of (and I introduced this).
Adding alpha-level support is complicated for the devices people normally use, although it would be trivial in PDF1.4.
On Wed, 12 Nov 2003, Crispin Miller wrote:
Does anyone know whether it is possible to construct a colour for plotting with an alpha value as well as simply specifying rgb values?
-- Dr Paul Murrell Department of Statistics The University of Auckland Private Bag 92019 Auckland New Zealand 64 9 3737599 x85392 [EMAIL PROTECTED] http://www.stat.auckland.ac.nz/~paul/
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