Bug report #2861: new symbology: (overall) transparency slider missing for categorized/graduated symbology - QGIS Application - QGIS Issue Tracking

Bug report #2861

new symbology: (overall) transparency slider missing for categorized/graduated symbology

Added by Giovanni Manghi over 14 years ago. Updated over 11 years ago.

Status:	Closed
Priority:	Low
Assignee:	Martin Dobias
Category:	Symbology
Affected QGIS version:	master	Regression?:	No
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	12921

Description

tested with

http://www.igeo.pt/gdr/Downloads/ProdutosCLC/CLC06_PT.zip

it is also not very intuitive to have to go pick the transparency slider inside the "symbol" dialog. It would be better to have among the other options in the symbology tab, as it happens for the single symbol case.

History

#1 Updated by Volker Fröhlich about 14 years ago

Your sample data doesn't seem to be there any more.

I tried with different data and it works with Trunk.

Please give it a try!

#2 Updated by Giovanni Manghi about 14 years ago

The server is down, but the data doesn't matter. Pick a polygon vector, with the new engine make a categorized symbology.

You DON'T have a slider to set the the overall transparency for all the categories at one time, you can JUST enter each category and set the transparency one by one.

Some thing for graduated symbology.

#3 Updated by Giovanni Manghi almost 14 years ago

bottom line, you can just set transparency for single classes but not for all classes at one time (like in old symbology). If you consider that in new symbology you cannot choose more that one class at one time (like in old symbology) than this turn to be a real problem, especially if you have more than a few classes.

#4 Updated by Giovanni Manghi almost 14 years ago

#5 Updated by Sandro Santilli over 13 years ago

subscribing to the issue, I'm missing the slider too

#6 Updated by Martin Dobias over 13 years ago

It should be possible to set the transparency for the source symbol - the same transparency should be applied for each class when you (re)classify. Isn't that sufficient?

The problem with a "global" transparency setting is that as of now various categories might have various transparency levels assigned. Global transparency setting would then override that with new value for all symbols.

#7 Updated by Sandro Santilli over 13 years ago

Oh yes, I see it now. And you have to hit "classify" again too, which changes the colors if youre using random color range.

About global transparency, can't you just concatenate transparencies ?
50% of transparency on the symbol * 50% of transparency globally would get to 75% transparency...

#8 Updated by Giovanni Manghi over 13 years ago

About global transparency, can't you just concatenate transparencies ?
50% of transparency on the symbol * 50% of transparency globally would get to 75% transparency...

I think that this would be a good solution.

Martin, we also miss the possibility to select multiple symbology classes at the same time like in the old symbology (and then give the same symbology to the selected classes). There is already a ticket open about this issue?