move GeoPoint to its own file

@@ -2,6 +2,7 @@
 Improvements:
 * The `type` of an `Email` is now non-null.
 * The `phoneNumber` of an `SMS` is now non-null.
+* The `latitude` and `longitude` of a `GeoPoint` are now non-null.
 
 ## 3.5.0
 New Features:

@@ -17,6 +17,7 @@ export 'src/objects/barcode_capture.dart';
 export 'src/objects/calendar_event.dart';
 export 'src/objects/driver_license.dart';
 export 'src/objects/email.dart';
+export 'src/objects/geo_point.dart';
 export 'src/objects/mobile_scanner_arguments.dart';
 export 'src/objects/sms.dart';
 export 'src/objects/wifi.dart';

@@ -2,6 +2,7 @@ import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:mobile_scanner/src/objects/geo_point.dart';
 
 Size toSize(Map data) {
   final width = data['width'] as double;

@@ -9,6 +9,7 @@ import 'package:mobile_scanner/src/enums/phone_type.dart';
 import 'package:mobile_scanner/src/objects/calendar_event.dart';
 import 'package:mobile_scanner/src/objects/driver_license.dart';
 import 'package:mobile_scanner/src/objects/email.dart';
+import 'package:mobile_scanner/src/objects/geo_point.dart';
 import 'package:mobile_scanner/src/objects/sms.dart';
 import 'package:mobile_scanner/src/objects/wifi.dart';
 
@@ -242,20 +243,6 @@ class PersonName {
         pronunciation = data['pronunciation'] as String?;
 }
 
-/// GPS coordinates from a 'GEO:' or similar QRCode type.
-class GeoPoint {
-  /// Gets the latitude.
-  final double? latitude;
-
-  /// Gets the longitude.
-  final double? longitude;
-
-  /// Create a [GeoPoint] from native data.
-  GeoPoint.fromNative(Map data)
-      : latitude = data['latitude'] as double?,
-        longitude = data['longitude'] as double?;
-}
-
 /// Phone number info.
 class Phone {
   /// Gets phone number.

+/// GPS coordinates from a `GEO:` or similar QRCode type.
+class GeoPoint {
+  /// Construct a new [GeoPoint] instance.
+  const GeoPoint({
+    required this.latitude,
+    required this.longitude,
+  });
+
+  /// Construct a [GeoPoint] from the given [data].
+  ///
+  /// If the data does not contain valid GeoPoint coordinates,
+  /// then `0,0` is returned.
+  factory GeoPoint.fromNative(Map<Object?, Object?> data) {
+    final double? latitude = data['latitude'] as double?;
+    final double? longitude = data['longitude'] as double?;
+
+    // If either is not set, then this GeoPoint is invalid.
+    // Return the geographic center as fallback.
+    if (latitude == null || longitude == null) {
+      return const GeoPoint(latitude: 0.0, longitude: 0.0);
+    }
+
+    return GeoPoint(latitude: latitude, longitude: longitude);
+  }
+
+  /// The latitude of the coordinate.
+  final double latitude;
+
+  /// The longitude of the coordinate.
+  final double longitude;
+}