[Qgis-developer] line renderer and composition mode

[Jürgen E. Fischer]

Hi Andrea,

On Wed, 27. Aug 2014 at 16:20:14 +0200, Andrea Peri wrote:
> Your solution is not always good.
> You should could use the level symbols to give what symbol won in overlap.

I'm already using symbol levels.  Is there a way to have transparency in higher
levels remove earlier rendered stuff on lower levels?

Level 2 - .. -
Level 1 -.-.-.

Should look like

        - .. -

if there are level 1 & 2 boundaries on top of each other and not like

        -...--

Still the transparent bits should not cover (vector/raster) layers below.
Putting a fully transparent line on the bottom of each level and rendering it
in source composition mode would achieve that (ie. the transparent bits of the
higher level would make everything rendered in lower levels transparent again
instead of leaving it as is).


Jürgen

-- 
Jürgen E. Fischer           norBIT GmbH             Tel. +49-4931-918175-31
Dipl.-Inf. (FH)             Rheinstraße 13          Fax. +49-4931-918175-50
Software Engineer           D-26506 Norden             http://www.norbit.de
QGIS release manager (PSC)  Germany                    IRC: jef on FreeNode                         
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