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A dart helper to calculate the distance between two geometric points
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| import 'dart:math'; | |
| double calculateDifference(double lat1, double lon1, double lat2, double lon2) { | |
| double radius = 6371; // km | |
| double changeInLat = toRad(lat2 - lat1); | |
| double changeInLong = toRad(lon2 - lon1); | |
| double lat1Rad = toRad(lat1); | |
| double lat2Rad = toRad(lat2); | |
| double formula = sin(changeInLat / 2) * sin(changeInLat / 2) + | |
| sin(changeInLong / 2) * | |
| sin(changeInLong / 2) * | |
| cos(lat1Rad) * | |
| cos(lat2Rad); | |
| double c = 2 * atan2(sqrt(formula), sqrt(1 - formula)); | |
| return radius * c; | |
| } |
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