UPDATE: As of October 2019, QGIS 3.10 has built-in support for label callout lines!
Callouts, sometimes called leader lines, are lines between labels and features on a map. They are useful when constraints of space force a label to be moved away from the
| {% with id=widget.attrs.id %} | |
| {% for group, options, index in widget.optgroups %} | |
| {% for option in options %} | |
| {% with widget=option %} | |
| {% include widget.template_name%} | |
| {% endwith %} | |
| {% endfor %} | |
| {% endfor %} | |
| {% endwith %} |
| from django.contrib.gis.geos import GEOSGeometry | |
| # sample data | |
| geom_1 = GEOSGeometry('POLYGON((-71.8 42.1,-70.6 42.1,-70.5 41.2,-71.8 41.2,-71.8 42.1))') | |
| geom_2 = GEOSGeometry('POLYGON((-71.12 42.23,-71.48 42.34,-71.52 42.55,-71.12 42.23))') | |
| geom_3 = GEOSGeometry('POLYGON((-73.12 42.23,-71.48 42.34,-71.52 42.55,-73.12 42.23))') | |
| polygons = [geom_1, geom_2, geom_3] | |
| # get first polygon | |
| polygon_union = polygons[0] |
