panorama initial longitude

lib/widgets/viewer/panorama_page.dart

@@ -14,6 +14,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
+import 'package:latlong2/latlong.dart';
 import 'package:panorama/panorama.dart';
 import 'package:provider/provider.dart';
 
@@ -68,14 +69,33 @@ class _PanoramaPageState extends State<PanoramaPage> {
               ValueListenableBuilder<SensorControl>(
                 valueListenable: _sensorControl,
                 builder: (context, sensorControl, child) {
+                  void onTap(longitude, latitude, tilt) => _overlayVisible.value = !_overlayVisible.value;
+                  final imageChild = child as Image;
+
+                  if (info.hasCroppedArea) {
+                    final croppedArea = info.croppedAreaRect!;
+                    final fullSize = info.fullPanoSize!;
+                    final longitude = ((croppedArea.left + croppedArea.width / 2) / fullSize.width - 1 / 2) * 360;
+                    return Panorama(
+                      // TODO TLAD [panorama] fork and fix
+                      // as of panorama v0.4.0, doc says `latitude` and `longitude` parameters are in degrees,
+                      // but they are actually converted from radians in state initialization
+                      // as of panorama v0.4.0, state uses longitude in degrees as radians with `Quaternion.axisAngle`
+                      longitude: degToRadian(longitude),
+                      sensorControl: sensorControl,
+                      croppedArea: croppedArea,
+                      croppedFullWidth: fullSize.width,
+                      croppedFullHeight: fullSize.height,
+                      onTap: onTap,
+                      child: imageChild,
+                    );
+                  } else {
                     return Panorama(
                       sensorControl: sensorControl,
-                    croppedArea: info.hasCroppedArea ? info.croppedAreaRect! : const Rect.fromLTWH(0.0, 0.0, 1.0, 1.0),
+                      onTap: onTap,
-                    croppedFullWidth: info.hasCroppedArea ? info.fullPanoSize!.width : 1.0,
+                      child: imageChild,
-                    croppedFullHeight: info.hasCroppedArea ? info.fullPanoSize!.height : 1.0,
-                    onTap: (longitude, latitude, tilt) => _overlayVisible.value = !_overlayVisible.value,
-                    child: child as Image,
                     );
+                  }
                 },
                 child: Image(
                   image: entry.uriImage,