Bug report #13754
Selected Multipolygon by Rectangle / "on the fly" reprojection = Only few entities are selected
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Severe/Regression | ||
| Assignee: | - | ||
| Category: | Map Canvas | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | fixed/implemented |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 21781 |
Description
Hi,
The graphical selection on multipolygons, does not recover all entities when using reprojection "on the fly".
example:
multipolygon CRS 3857 + qgis project CRS 3857 + selection of all entities: works well
multipolygon CRS 3857 + qgis project CRS 2154 ("on the fly" reprojection) + selection of all entities: Only few entities are selected
Associated revisions
selection by polygon: use 40 instead of 4 points for selection rectangle for more accurate transformation (fixes #13754)
selection by polygon: use 40 instead of 4 points for selection rectangle for more accurate transformation (fixes #13754)
(cherry picked from commit 0a83f182f3e8aea684163096f70efc9f38399ad2)
History
#1
Updated by Giovanni Manghi over 8 years ago
- Category changed from Map Tools to Map Canvas
- Priority changed from Normal to Severe/Regression
- Target version set to Future Release - High Priority
- Affected QGIS version changed from 2.12.0 to master
This worked as expected until 2.8.3
Actually in 2.8.3 if selecting outside the boundaries of a certain layer CRS QGIS shown this message
CRS Exception: Selection extends beyond layer's coordinate system
that is not anymore the case in qgis > 2.8.3
#2
Updated by Nyall Dawson over 8 years ago
- Status changed from Open to Feedback
Can you give some more detail? I tried with a few multipolygon layers and couldn't reproduce
#3
Updated by Julien Ancelin over 8 years ago
- File test_bug_select.sqlite added
Here is a multipolygon layer with a "3943 crs".
if the qgis project is in crs 3943, no selection problem.
If I reprojects on the fly with "crs 3857" and I'm trying to select all: some multipolygones are not selected
#4
Updated by Giovanni Manghi over 8 years ago
- File wb1.dbf.zip added
- Status changed from Feedback to Open
attached another small dataset.
#5
Updated by Nyall Dawson about 8 years ago
- Status changed from Open to Feedback
Julien - I get an error opening that dataset
Giovanni - I can't reproduce using your dataset.
#6
Updated by Giovanni Manghi about 8 years ago
- Status changed from Feedback to Open
Giovanni - I can't reproduce using your dataset.
open the dataset I attached, enable otf to 2154, try do a selection. Cheers!
#7
Updated by Saber Razmjooei almost 8 years ago
- Status changed from Open to Feedback
I can't reproduce with the latest master.
#8
Updated by Giovanni Manghi almost 8 years ago
- Status changed from Feedback to Open
zoom out to ~300.000.000 and try select all features by click and drag.
If you zoom in enough selection seems to work, but not if you zoom out enough.
#9
Updated by Jürgen Fischer almost 8 years ago
- Status changed from Open to Closed
Fixed in changeset 0a83f182f3e8aea684163096f70efc9f38399ad2.
#10
Updated by Jürgen Fischer almost 8 years ago
- Resolution set to fixed/implemented
Giovanni Manghi wrote:
zoom out to ~300.000.000 and try select all features by click and drag.
If you zoom in enough selection seems to work, but not if you zoom out enough.
It only worked when the projections were somewhat alike. The four points of a rectangle around the extent of the layer in EPSG:2154 were transformed to a polygon in EPSG:3857 that excludes Arabia. 0a83f182 adds 9 points to each rectangle edge and improves it. Selection for more "stronger" projections might still "fail" and need more points (e.g. polar and non-polar).