Fixes #213: Points are now centered on the map.

added logic into model to check if project extent is within the map bounds

cadasta/organization/models.py

@@ -234,6 +234,38 @@ def public(self):
         return self.access == 'public'
 
 
+def reassign_project_extent(instance):
+    if instance.extent:
+        points = [list(x) for x in list(instance.extent.boundary.coords)]
+        extent_visible = True
+        for point in points:
+            if point[0] < -180 or point[0] > 180:
+                extent_visible = False
+                break
+        if extent_visible:
+            return
+        extent = '(('
+        for i, point in enumerate(points):
+            while point[0] < -180 or point[0] > 180:
+                if point[0] < -180:
+                    point[0] += 360
+                elif point[0] > 180:
+                    point[0] -= 360
+            if i != len(points) - 1:
+                extent += ' '.join([str(point[0]), str(point[1]), ','])
+            else:
+                extent += ' '.join([str(point[0]), str(point[1])])
+        polygon = str(instance.extent).split(' ')[0]
+        new_extent = ('{} {}))'.format(polygon, extent))
+        instance.extent = new_extent
+
+
+@receiver(models.signals.pre_save, sender=Project)
+def check_extent(sender, instance, **kwargs):
+    if instance.extent:
+        reassign_project_extent(instance)
+
+
 class ProjectRole(RandomIDModel):
     project = models.ForeignKey(Project)
     user = models.ForeignKey('accounts.User')

cadasta/organization/tests/test_models.py

@@ -114,6 +114,19 @@ def test_country_assignment_for_invalid_geometry(self):
         )
         assert project.country == ''
 
+    def test_reassign_extent(self):
+        project = ProjectFactory.create(
+            extent='SRID=4326;POLYGON(('
+            '211.36667 47.25000, '
+            '211.41667 47.25000, '
+            '211.41667 47.28333, '
+            '211.36667 47.28333, '
+            '211.36667 47.25000))'
+        )
+        assert project.extent.boundary.coords == (
+            (-148.63333, 47.25), (-148.58333, 47.25), (-148.58333, 47.28333),
+            (-148.63333, 47.28333), (-148.63333, 47.25))
+
     def test_defaults_to_public(self):
         project = ProjectFactory.create()
         assert project.public()