labels with (rectangle) background overlap each other

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 7680
Affected QGIS version: master
Redmine category:labelling

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The new background feature for labels seem to be missing some refinement in its collision detection algorithm. As seen in the attached screenshot, it currently fails to prevent label overlap. It might be due to the buffer value not being taken into account?

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• label-background-overlap.jpg (Mathieu Pellerin - nIRV)

[qgib]

Author Name: Larry Shaffer (Larry Shaffer)

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It is not part of the implementation for any backgrounds or drop shadows, yet. See commit b809723

This should be an optional setting (off by default), as calculating the bounds of the label's background can be expensive and lead to unexpected results (I'm figuring much less labels would be rendered in some cases). While 'normal' backgrounds are not a big issue (those of fixed size or slight buffers), ones with significant offset and rotation might cause problems.

Concerning SVGs, there will need to be loading of the file twice (unless still cached) and creation of possibly significant QImage of the shadow twice per SVG per layer to both calculate and render the label. And, the calculating upfront, before sending to PAL would be for all labels, including the ones that may never be rendered. Again, some caching might help there.

I will be looking into this within the next week.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Labelling

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0
• regression was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR
*
Source:*
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed

[nyalldawson]

Still an issue with 3.8

[Pedro-Murteira]

I've tested this issue on QGIS 3.22.3 and I can't seem to reproduce it, i've tested this with diferent settings and data samples, and I always get the correct behaviour out of the (rectangle) background labels. (Windows 10)

[github-actions]

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[github-actions]

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