Bug report #10597

[errpr] buffers 1.8 vs 2.2

Added by wiktor matlakiewicz over 5 years ago. Updated over 2 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Processing/QGIS
Affected QGIS version:2.2.0 Regression?:
Operating System: Easy fix?:
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:No Copied to github as #:19002

Description

qgis version: 2.2.0-Valmiera rev. c3a2817
OS: windows 7 prof 64bit

Create buffers without intersections.

image 00 - buffers creating settings (both 1.8 and 2.2)
image 01 - old buffers created by 1.8 (OK)
image 02 - new buffers created by 2.2 (WRONG)

00_settings.jpg (43.7 KB) wiktor matlakiewicz, 2014-06-16 12:15 AM

01_buffers_18.jpeg (28.5 KB) wiktor matlakiewicz, 2014-06-16 12:15 AM

02_buffers_22.jpg (20.6 KB) wiktor matlakiewicz, 2014-06-16 12:15 AM

History

#1 Updated by Giovanni Manghi over 5 years ago

  • Target version set to Version 2.4
  • Category set to 44
  • Status changed from Open to Feedback

please attach sample data.

#2 Updated by Jürgen Fischer over 5 years ago

  • Target version changed from Version 2.4 to Future Release - High Priority

#3 Updated by wiktor matlakiewicz over 5 years ago

Now I see what really happend.
Buffer creating OK, this is rendering / view problem.

qgis 1.8 shows overlayed elements "double" - so overlayed parts show as "darker" on image 01.

qgis 2.2 shows overlayed elements once - lover element is full covered by upper when both are from the same shp.

#4 Updated by Giovanni Manghi over 5 years ago

  • Status changed from Feedback to Closed
  • Resolution set to invalid

you have two kind of transparency in qgis 2.x: the layer transparency and the symbol transparency. If you use the first (not available in 1.8) then you see the effect you describe.

#5 Updated by Giovanni Manghi over 2 years ago

The "ftools" category is being removed from the tracker, changing the category of this ticket to "Processing/QGIS" to not leave the category orphaned.

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