Abstract base mode shared by time/distance isochrone modes.
A subclass only needs to declare its mode name and contourType.
The clicked location is kept in the store only while the Valhalla API request
is in flight; once isochrone polygons are computed they are stored in the
Terra Draw store as the canonical features and the transient point is removed.
Polygons computed from the same click share properties.groupId.
Abstract base mode shared by time/distance isochrone modes. A subclass only needs to declare its
modename andcontourType.The clicked location is kept in the store only while the Valhalla API request is in flight; once isochrone polygons are computed they are stored in the Terra Draw store as the canonical features and the transient point is removed. Polygons computed from the same click share
properties.groupId.