CODEWITHSUNDEEP
google-mapsflutterdartgeolocationlatitude-longitude
BIS Tech
BIS Tech

Reputation: 19504

how to calculate current location change by 10 meters?

How to calculate current location change by 10 meters? 10 meters is dynamically changed.

I tried, location plugin on Flutter. but not working curretly.

location.changeSettings(distanceFilter: 10,interval: 1000); //10 is meters, but location is updating every time.

How to calculate like this, I need to know how to calculate.(Because I need to calculate waiting time when travelling)

if(currentLocation > previousLocation) // currentLocation should be greater than 10 meters 

currentLication = previousLocation + 10 meters

Upvotes: 0

Views: 1358

Answers (1)

user969068
user969068

Reputation: 2943

I don't think location plugin provide such functionality at this time, But you can use onLocationChanged callback event

location.onLocationChanged().listen((LocationData currentLocation) {
  // Use current location
});

It will return you current location, than you have to calculate it by using Haversine formula, see more details here and here

a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)
c = 2 ⋅ atan2( √a, √(1−a) )
d = R ⋅ c

below dart code can help you to calculate difference and get next location:

import 'dart:math' show cos, sqrt, asin;

double calculateDistance(LatLng l1, LatLng l2) {
  const p = 0.017453292519943295;
  final a = 0.5 -
      cos((l2.latitude - l1.latitude) * p) / 2 +
      cos(l1.latitude * p) *
          cos(l2.latitude * p) *
          (1 - cos((l2.longitude - l1.longitude) * p)) /
          2;
  return 12742 * asin(sqrt(a));
}

Upvotes: 2

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