From 882a303cc2464f298fc04bd52c59a41c31af87ba Mon Sep 17 00:00:00 2001
From: Lukas Himsel <lukas@himsel.me>
Date: Mon, 20 Jun 2022 09:28:33 +0200
Subject: [PATCH 1/2] start new signing mechanism from #46

---
 lib/src/geojson.dart | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/src/geojson.dart b/lib/src/geojson.dart
index 75f2e3b6..93669d4b 100644
--- a/lib/src/geojson.dart
+++ b/lib/src/geojson.dart
@@ -68,9 +68,13 @@ abstract class GeoJSONObject {
 
 /// Coordinate types, following https://tools.ietf.org/html/rfc7946#section-4
 abstract class CoordinateType implements Iterable<num> {
+  final bool isSigned;
   final List<num> _items;
 
-  CoordinateType(List<num> list) : _items = List.of(list, growable: false);
+  CoordinateType(
+    List<num> list,
+    this.isSigned,
+  ) : _items = List.of(list, growable: false);
 
   @override
   num get first => _items.first;
@@ -180,7 +184,7 @@ abstract class CoordinateType implements Iterable<num> {
 
   CoordinateType toSigned();
 
-  bool get isSigned;
+  CoordinateType toUnsigned();
 
   _untilSigned(val, limit) {
     if (val > limit) {

From 01187dc68b1fa93e1dec0fb065978aa288f99d68 Mon Sep 17 00:00:00 2001
From: Lukas Himsel <lukas@himsel.me>
Date: Sun, 11 Sep 2022 19:06:40 +0200
Subject: [PATCH 2/2] finish basic implementation

---
 lib/src/geojson.dart | 112 ++++++++++++++++++++++++++++---------------
 1 file changed, 73 insertions(+), 39 deletions(-)

diff --git a/lib/src/geojson.dart b/lib/src/geojson.dart
index b02bc81a..cb439a97 100644
--- a/lib/src/geojson.dart
+++ b/lib/src/geojson.dart
@@ -68,12 +68,12 @@ abstract class GeoJSONObject {
 
 /// Coordinate types, following https://tools.ietf.org/html/rfc7946#section-4
 abstract class CoordinateType implements Iterable<num> {
-  final bool isSigned;
+  final bool _signed;
   final List<num> _items;
 
   CoordinateType(
     List<num> list,
-    this.isSigned,
+    this._signed,
   ) : _items = List.of(list, growable: false);
 
   @override
@@ -186,6 +186,8 @@ abstract class CoordinateType implements Iterable<num> {
 
   CoordinateType toUnsigned();
 
+  bool get isSigned => _signed;
+
   num _untilSigned(num val, limit) {
     if (val > limit) {
       return _untilSigned(val - 360, limit);
@@ -199,24 +201,36 @@ abstract class CoordinateType implements Iterable<num> {
 /// Please make sure, you arrange your parameters like this:
 /// 1. Longitude, 2. Latitude, 3. Altitude (optional)
 class Position extends CoordinateType {
-  Position(num lng, num lat, [num? alt])
-      : super([
-          lng,
-          lat,
-          if (alt != null) alt,
-        ]);
-
-  Position.named({required num lat, required num lng, num? alt})
-      : super([
-          lng,
-          lat,
-          if (alt != null) alt,
-        ]);
+  Position(num lng, num lat, [num? alt, bool signed = false])
+      : super(
+          [
+            lng,
+            lat,
+            if (alt != null) alt,
+          ],
+          signed,
+        );
+
+  Position.named(
+      {required num lat, required num lng, num? alt, bool signed = false})
+      : super(
+          [
+            lng,
+            lat,
+            if (alt != null) alt,
+          ],
+          signed,
+        );
 
   /// Position.of([<Lng>, <Lat>, <Alt (optional)>])
-  Position.of(List<num> list)
-      : assert(list.length >= 2 && list.length <= 3),
-        super(list);
+  Position.of(
+    List<num> list, {
+    bool signed = false,
+  })  : assert(list.length >= 2 && list.length <= 3),
+        super(
+          list,
+          signed,
+        );
 
   factory Position.fromJson(List<num> list) => Position.of(list);
 
@@ -257,17 +271,21 @@ class Position extends CoordinateType {
   num? get alt => length == 3 ? _items[2] : null;
 
   @override
-  bool get isSigned => lng <= 180 && lat <= 90;
+  bool get isSigned => _signed && lng <= 180 && lat <= 90;
 
   @override
   Position toSigned() => Position.named(
         lng: _untilSigned(lng, 180),
         lat: _untilSigned(lat, 90),
         alt: alt,
+        signed: true,
       );
 
   @override
-  Position clone() => Position.of(_items);
+  Position toUnsigned() => Position.of(_items, signed: false);
+
+  @override
+  Position clone() => Position.of(_items, signed: _signed);
 
   @override
   int get hashCode => Object.hashAll(_items);
@@ -303,14 +321,18 @@ class BBox extends CoordinateType {
 
     /// altitude 2 for 3 dim. positions
     num? alt2,
-  ]) : super([
-          lng1,
-          lat1,
-          alt1,
-          lng2,
-          if (lat2 != null) lat2,
-          if (alt2 != null) alt2,
-        ]);
+    bool signed = false,
+  ]) : super(
+          [
+            lng1,
+            lat1,
+            alt1,
+            lng2,
+            if (lat2 != null) lat2,
+            if (alt2 != null) alt2,
+          ],
+          signed,
+        );
 
   BBox.named({
     required num lng1,
@@ -319,19 +341,28 @@ class BBox extends CoordinateType {
     required num lng2,
     required num lat2,
     num? alt2,
-  }) : super([
-          lng1,
-          lat1,
-          if (alt1 != null) alt1,
-          lng2,
-          lat2,
-          if (alt2 != null) alt2,
-        ]);
+    bool signed = false,
+  }) : super(
+          [
+            lng1,
+            lat1,
+            if (alt1 != null) alt1,
+            lng2,
+            lat2,
+            if (alt2 != null) alt2,
+          ],
+          signed,
+        );
 
   /// Position.of([<Lng>, <Lat>, <Alt (optional)>])
-  BBox.of(List<num> list)
-      : assert(list.length == 4 || list.length == 6),
-        super(list);
+  BBox.of(
+    List<num> list, {
+    bool signed = false,
+  })  : assert(list.length == 4 || list.length == 6),
+        super(
+          list,
+          signed,
+        );
 
   factory BBox.fromJson(List<num> list) => BBox.of(list);
 
@@ -382,6 +413,9 @@ class BBox extends CoordinateType {
         lng2: _untilSigned(lng2, 180),
       );
 
+  @override
+  BBox toUnsigned() => BBox.of(_items, signed: false);
+
   @override
   int get hashCode => Object.hashAll(_items);