Total distance calculation from LatLng List. You can do a loop and find total distance by using 2 points each time. I added some random dummy data to show how it works. Copy this code to https://dartpad.dartlang.org/ and test easily.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | import 'dart:math' show cos, sqrt, asin; void main() { double calculateDistance(lat1, lon1, lat2, lon2){ var p = 0.017453292519943295; var c = cos; var a = 0.5 - c((lat2 - lat1) * p)/2 + c(lat1 * p) * c(lat2 * p) * (1 - c((lon2 - lon1) * p))/2; return 12742 * asin(sqrt(a)); } List<dynamic> data = [ { "lat": 44.968046, "lng": -94.420307 },{ "lat": 44.33328, "lng": -89.132008 },{ "lat": 33.755787, "lng": -116.359998 },{ "lat": 33.844843, "lng": -116.54911 },{ "lat": 44.92057, "lng": -93.44786 },{ "lat": 44.240309, "lng": -91.493619 },{ "lat": 44.968041, "lng": -94.419696 },{ "lat": 44.333304, "lng": -89.132027 },{ "lat": 33.755783, "lng": -116.360066 },{ "lat": 33.844847, "lng": -116.549069 }, ]; double totalDistance = 0; for(var i = 0; i < data.length-1; i++){ totalDistance += calculateDistance(data[i]["lat"], data[i]["lng"], data[i+1]["lat"], data[i+1]["lng"]); } print(totalDistance); } |
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