Re: background of DIA diagram

[Thomas HARDING <tom thomas-harding name>]

On 16/11/2014 16:02, Michael Ross wrote:
> By definition a transparent background makes no sense - you would 
> never know it is transparent because it is behind everything else - so 
> I probably don't under stand what you are after.
>
> There is nothing in the current version of Dia that has transparency - 
> I think it is coming and me be part of the unreleased stuff.
svg color models has an alpha channel. This is not tranparency: this is 
opacity, default to 1. I know Dia for an xml
superset/subset of svg. Obviously, it should be simpler to act on custom 
shapes than programmatic ones, in such case use an embedding "group" 
will help after export.

A workaround after exort to svg:

So, simply embed your "background" elements with a "g" by hand, then set 
opacity and fill-opacity properties on that group (from 0.nnnn to 1).

Same for foregrounds elements.

> On occasions when I wanted something to be transparent in front of 
> another - I have used Inkscape to create it and sometimes GIMP, than 
> made an image of it and placed into DIA as a image.  You can expand 
> and contract that image and layer it to be behind whatever else you 
> are diagramming.
>
> On Sun, Nov 16, 2014 at 5:26 AM, Vedran Vucic <vedran vucic gmail com 
> <mailto:vedran vucic gmail com>> wrote:
>
>     Hello,
>
>     I found how can I change color of DIA diagram background. But,  how to
>     make it transparent?
>
>
>     Best wishes,
>
>     VV
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> Michael E. Ross
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