Add a helper function for populating the geometry field of an entity (logic extracted from farm_log.module).

farm_map.module

@@ -84,6 +84,42 @@ function farm_map_openlayers_object_preprocess_alter(&$build, $context) {
   }
 }
 
+/**
+ * Helper function for populating the geometry field of an entity.
+ *
+ * @param Entity $entity
+ *   The entity object.
+ * @param array $geoms
+ *   An array of geometry strings in WKT format.
+ */
+function farm_map_geofield_populate(&$entity, $geoms = array()) {
+
+  // If no geometries were found, bail.
+  if (empty($geoms)) {
+    return;
+  }
+
+  // Load the GeoPHP library.
+  geophp_load();
+
+  // Implode the array of geometries into a single string.
+  $geom = implode(',', $geoms);
+
+  // If there is more than one geometry, wrap them all in a geometry collection.
+  if (count($geoms) > 1) {
+    $geom = 'GEOMETRYCOLLECTION (' . $geom . ')';
+  }
+
+  // Convert to a GeoPHP geometry object and reduce the geometry.
+  $geometry = geoPHP::load($geom, 'wkt');
+  $geometry = geoPHP::geometryReduce($geometry);
+
+  // Save the combined geometry to the movement log.
+  if (!empty($geometry)) {
+    $entity->field_farm_geofield[LANGUAGE_NONE][0] = geofield_get_values_from_geometry($geometry);
+  }
+}
+
 /**
  * Calculate latitude degree length at a given latitude. Equations are taken
  * from https://en.wikipedia.org/wiki/Geographic_coordinate_system#Expressing_latitude_and_longitude_as_linear_units