indoorLevelUp method
Increases the indoor level by 1.
Implementation
MapPosition indoorLevelUp() {
return MapPosition._(
latitude: _latitude,
longitude: _longitude,
zoomlevel: zoomlevel,
indoorLevel: indoorLevel + 1,
rotation: _rotation,
rotationRadian: _rotationRadian,
scale: 1,
focalPoint: null,
projection: _projection,
center: _center,
);
}