Implementation of labeling engine rules (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#58580
Author: @nyalldawson
QGIS version: 3.40

Implementation of labeling engine rules

PR Description:

See qgis/QGIS-Enhancement-Proposals#299

Implements the API framework for setting advanced labeling engine rules for a project, and implements 4 initial rule types:

• QgsLabelingEngineRuleMinimumDistanceLabelToFeature: prevents labels being placed too close to features from a different layer
• QgsLabelingEngineRuleMaximumDistanceLabelToFeature: prevents labels being placed too far from features from a different layer
• QgsLabelingEngineRuleMinimumDistanceLabelToLabel: prevents labels being placed too close to labels from a different layer
• QgsLabelingEngineRuleAvoidLabelOverlapWithFeature: prevents labels being placed overlapping features from a different layer

(note that the first 3 rules require a build based on GEOS >= 3.10, they are not available for older GEOS builds)

Also implements a registry for storing available rule classes, and serialization of rules and configuration in QGIS projects

Now with GUI:

Peek.2024-09-06.13-06.mp4

Sponsored by Rubicon Concierge Real Estate

Commits tagged with [need-docs] or [FEATURE]