apply method
Applies this operation to the current list.
Modifies current in place and returns the effective operation
(e.g. populated with captured state like removed index).
Implementation
@override
PolylineOp apply(List<InteractivePolyline> list) {
final idx = list.indexWhere((p) => p.key == key);
if (idx >= 0) {
final target = list[idx];
final deltaLat = to.latitude - from.latitude;
final deltaLng = to.longitude - from.longitude;
final newPoints = target.points.map((p) {
return LatLng(p.latitude + deltaLat, p.longitude + deltaLng);
}).toList();
list[idx] = target.copyWith(points: newPoints);
}
return this;
}