Simplification causes GEOS exceptions when layer has labels

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Author Name: Nyall Dawson (@nyalldawson)
Original Redmine Issue: 9375
Affected QGIS version: master
Redmine category:vectors
Assignee: Alvaro Huarte

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I'm running into an issue with the new rendering simplification option. With this enabled on a layer which has labels shown the log is showing a lot of GEOS exceptions:

Exception: IllegalArgumentException: Invalid number of points in LinearRing found 2 - must be 0 or >= 4
Exception: Unknown exception thrown

Happy to provide test datasets if required.

[qgib]

Author Name: Alvaro Huarte (@ahuarte47)

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Hi Nyall, are you using current master ? I am conversing with Jürgen Fischer, the commit (#13365a6c77903f1ef9cce012f52ff49c8e35f269a) has the ogr simplification broken

[qgib]

Author Name: Alvaro Huarte (@ahuarte47)

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• assigned_to_id was configured as Alvaro Huarte

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Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was configured as Future Release - High Priority
• category_id was configured as Vectors

[qgib]

Author Name: Alvaro Huarte (@ahuarte47)

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Hi Nyall, the pull #11147 was merged, can you test your issue please ?

[qgib]

Author Name: Alvaro Huarte (@ahuarte47)

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Hi Nyall, if you are testing a postgis layer, then these error comes from a bug in ST_Simplify function of postgis ( http://trac.osgeo.org/postgis/ticket/1698 ). This bug collapses the geometries when the tolerance is too much big.

If you are using postgis, this patch fixes it:
#1099

[qgib]

Author Name: Alvaro Huarte (@ahuarte47)

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• resolution was changed from to fixed/implemented
• pull_request_patch_supplied was changed from 0 to 1

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Author Name: Alvaro Huarte (@ahuarte47)

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• status_id was changed from Open to Feedback

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Author Name: Giovanni Manghi (@gioman)

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the patch has been merged.

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• status_id was changed from Feedback to Closed