feat: make zoom level dependent on search radius

src/fellchensammlung/templates/fellchensammlung/partials/partial-map.html

@@ -24,7 +24,7 @@
         container: 'map',
         style: '{% static "fellchensammlung/map/styles/colorful.json" %}',
         center: center,
-        zoom: 5
+        zoom: {{ zoom_level }}
     }).addControl(new maplibregl.NavigationControl());
 
     {% for adoption_notice in adoption_notices_map %}

src/fellchensammlung/tools/geo.py

@@ -11,6 +11,18 @@ from notfellchen import settings
 Position = namedtuple('Position', ['latitude', 'longitude'])
 
 
+def zoom_level_for_radius(radius) -> int:
+    if radius <= 20:
+        return 8
+    if radius <= 50:
+        return 7
+    if radius <= 150:
+        return 6
+    if radius <= 300:
+        return 5
+    else:
+        return 4
+
 def calculate_distance_between_coordinates(position1, position2):
     """
     Calculate the distance between two points identified by coordinates

src/fellchensammlung/views.py

@@ -21,7 +21,7 @@ from .forms import AdoptionNoticeForm, AdoptionNoticeFormWithDateWidget, ImageFo
     CommentForm, ReportCommentForm, AnimalForm, \
     AdoptionNoticeSearchForm, AnimalFormWithDateWidget, AdoptionNoticeFormWithDateWidgetAutoAnimal
 from .models import Language, Announcement
-from .tools.geo import GeoAPI
+from .tools.geo import GeoAPI, zoom_level_for_radius
 from .tools.metrics import gather_metrics_data
 from .tools.admin import clean_locations, get_unchecked_adoption_notices, deactivate_unchecked_adoption_notices, \
     deactivate_404_adoption_notices
@@ -203,7 +203,8 @@ def search(request):
                "searched": searched,
                "adoption_notices_map": AdoptionNotice.get_active_ANs(),
                "map_center": search.position,
-               "search_radius": search.max_distance,}
+               "search_radius": search.max_distance,
+               "zoom_level": zoom_level_for_radius(search.max_distance)}
     return render(request, 'fellchensammlung/search.html', context=context)