kgjenkins

Labels with callout lines in QGIS

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UPDATE: As of October 2019, QGIS 3.10 has built-in support for label callout lines!

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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

esseti

{% 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 %}

djq

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]