Total distance between two coordinates in dart/flutter
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);
}