Feature request #1898

Group Transparency/Opacity for Legend Groups

Added by Andreas Neumann about 8 years ago. Updated 6 months ago.

Status:Open
Priority:Low
Assignee:-
Category:Symbology
Pull Request or Patch supplied:No Resolution:
Easy fix?:No

Description

It would be nice if we could have group transparency (on groups of layers). This is a concept available in SVG (and potentially other technologies). The difference is that with group opacity/transparency, the layers in the group are rendered first individually (with or without opacity) and then the transparency is added on the intermediate rendering result of the group as a whole.

The difference is clearly seen if you have layers in a group where polygons of different layers overlap. You don't want opacity on the individual layers (since this would change colors), but you want to be able to set the opacity on the parent group, for being able to have a background base map shine through.

Here are two links on the topic:
http://www.w3.org/TR/SVG/masking.html#ObjectAndGroupOpacityProperties and http://labs.trolltech.com/blogs/2009/04/23/layered-rendering-part-2-it-helps-solve-many-problems/


Related issues

Related to QGIS Application - Feature request #3438: Transparency for vector symbol layers Closed

History

#1 Updated by Giovanni Manghi almost 6 years ago

  • Target version changed from Version 1.7.0 to Version 1.7.4

#2 Updated by Giovanni Manghi over 5 years ago

  • Target version changed from Version 1.7.4 to Version 2.0.0

#3 Updated by Giovanni Manghi about 5 years ago

  • Pull Request or Patch supplied set to No
  • Assignee deleted (nobody -)

see also #6198

#4 Updated by Pirmin Kalberer about 5 years ago

  • Target version changed from Version 2.0.0 to Future Release - Nice to have

#5 Updated by Andreas Neumann over 2 years ago

see also #3438

#6 Updated by Giovanni Manghi 6 months ago

  • Easy fix? set to No

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