[Rd] using rasterImage within image

Ben Bolker bbolker at gmail.com
Wed Feb 9 23:29:44 CET 2011

Hash: SHA1

On 11-02-09 03:09 PM, Henrik Bengtsson wrote:
> On Wed, Feb 9, 2011 at 11:53 AM, Simon Urbanek 
> <simon.urbanek at r-project.org> wrote:
>> On Feb 9, 2011, at 2:36 PM, Henrik Bengtsson wrote:
>>> On Wed, Feb 9, 2011 at 11:25 AM, Simon Urbanek 
>>> <simon.urbanek at r-project.org> wrote:
>>>> Ben,
>>>> I have committed something analogous to R-devel (your rotation
>>>> code was not unlike mine, I replicated the color handling from
>>>> R internals to be consistent, I fixed the drawing limits and
>>>> added a check for x/y conformance). Note that useRaster can
>>>> only be used when x, y form a regular grid. Although I tried a
>>>> lot of corner cases (requiring quite a few fixes), I'm sure I
>>>> did not test all of them, so volunteers please give it a go and
>>>> compare it with non-raster output.
>>>> The only thing I'm not quite happy about is the argument name:
>>>> useRaster. Personally, I hate camel case in R (it has crept in
>>>> more recently making it horribly inconsistent) so please feel
>>>> free to suggest a better name ;).
>>> It.is.spelled.camelCase.
>> Fortunately not in English ;)
>>> What about style=c("image", "raster")?  This allows for future
>>> extensions too.
>> Hmm.. it's not really a "style" - the output doesn't change
>> (ideally) - it's more of a back-end specification .. also we
>> already have oldstyle argument in image() adding to the confusion
>> ...
> flavor=c("image", "raster") renderer=c("image", "raster") 
> backend=c("image", "raster") ...

  Thanks Simon! (Any reports on the SDI Windows raster rendering issue,
or do we need a warning/workaround there?)

  I like "backend", or possibly "method"

  One minor consideration: if "raster" eventually becomes the default
(as I hope it will), there would need to be some internal logic that
drops back to "image" if the user specifies uneven spacing and doesn't
explicitly specify the 'backend/method' parameter ...
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