You may want to check out the 13-beta (which has added colour blending to
the rendering engine).
That said for uDig we draw into a buffered image and then adjust opacity
when rendering the buffered image into a final map.
--
Jody Garnett
On 28 January 2015 at 10:24, Andy Turner <a.g.d.tur...@leeds.ac.uk> wrote:
> Hello,
>
> Does anyone have any pointers about how to go about overlay the maps I am
> creating on OpenStreetMap data? I envisage being able to set the
> opacity/transparency of the higher layers so that it is possible to view
> the underlying OpenStreetMap layer more or less clearly. I have both raster
> and vector data layers to display. I was thinking to perhaps provide a
> slider control for the opacity/transparency, but for the time being I'd
> settle for setting a value. Also, for the time being, I am primarily
> producing static map images for a specific area, but I am also thinking
> about a more interactive visual display for interrogating data for this
> area. I was thinking that the most sensible thing to start with would be
> to download some OpenStreetMap Data and some styling goodies and work from
> local files rather than pulling in data across the web. Once I can display
> the OSM data on its own, I can then figure out the overlay part.
>
> Thanks in advance,
>
> Andy
> http://www.geog.leeds.ac.uk/people/a.turner/index.html
>
>
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leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net/
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