From 89de0bc384bb8eb3b922600e56ee66136a05f593 Mon Sep 17 00:00:00 2001
From: mmc <1556375442@qq.com>
Date: Wed, 11 Mar 2026 16:41:03 +0800
Subject: [PATCH] =?UTF-8?q?=E6=89=93=E7=82=B9=E6=B7=BB=E5=8A=A0=E8=B7=9D?=
 =?UTF-8?q?=E7=A6=BB?=
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---
 .../widgets/map/testmap_pages.dart            | 62 ++++++++++++++++++-
 1 file changed, 59 insertions(+), 3 deletions(-)

diff --git a/lib/features/home/presentation/widgets/map/testmap_pages.dart b/lib/features/home/presentation/widgets/map/testmap_pages.dart
index f0829438..66f187a0 100644
--- a/lib/features/home/presentation/widgets/map/testmap_pages.dart
+++ b/lib/features/home/presentation/widgets/map/testmap_pages.dart
@@ -1256,9 +1256,33 @@ class _MapPageEnterpriseState extends State<MapPageEnterprise> {
             ],
           ),
         if (_markedPoints.isNotEmpty && !_isWorkAreaCompleted && _currentRobotMode == RobotMode.point)
-          PolylineLayer(
-            polylines: [
-              Polyline(points: [_mapCenter, _markedPoints.last], color: Colors.blue.withOpacity(0.5), strokeWidth: 1.5),
+          Stack(
+            // 核心：替换Column为Stack
+            children: [
+              // 1. 蓝色连线
+              PolylineLayer(
+                polylines: [
+                  Polyline(points: [_mapCenter, _markedPoints.last], color: Colors.blue.withOpacity(0.5), strokeWidth: 1.5),
+                ],
+              ),
+              // 2. 距离文本Marker
+              MarkerLayer(
+                markers: [
+                  Marker(
+                    point: _getMiddleLatLng(_mapCenter, _markedPoints.last),
+                    width: 100,
+                    height: 30,
+                    child: Container(
+                      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+                      child: Text(
+                        _calculateLatLngDistance(_mapCenter, _markedPoints.last),
+                        style: const TextStyle(color: Colors.red, fontSize: 12, fontWeight: FontWeight.bold),
+                        textAlign: TextAlign.center,
+                      ),
+                    ),
+                  ),
+                ],
+              ),
             ],
           ),
 
@@ -2528,3 +2552,35 @@ double _transformLon(double x, double y) {
   ret += (150.0 * sin(x / 12.0 * _pi) + 300.0 * sin(x / 30.0 * _pi)) * 2.0 / 3.0;
   return ret;
 }
+
+/// 计算两个经纬度点之间的地面距离（单位：米，GCJ02/WGS84通用）
+String _calculateLatLngDistance(LatLng point1, LatLng point2) {
+  const double earthRadius = 6371000; // 地球半径（米）
+
+  // 经纬度转弧度
+  double lat1Rad = point1.latitude * pi / 180;
+  double lat2Rad = point2.latitude * pi / 180;
+  double lng1Rad = point1.longitude * pi / 180;
+  double lng2Rad = point2.longitude * pi / 180;
+
+  // 哈维正弦公式（Haversine）计算地球表面两点实际距离
+  double dLat = lat2Rad - lat1Rad;
+  double dLng = lng2Rad - lng1Rad;
+  double a = sin(dLat / 2) * sin(dLat / 2) + cos(lat1Rad) * cos(lat2Rad) * sin(dLng / 2) * sin(dLng / 2);
+  double c = 2 * atan2(sqrt(a), sqrt(1 - a));
+  double distance = earthRadius * c;
+
+  // 格式化显示：短距离显示米，长距离显示千米
+  if (distance < 1000) {
+    return '${distance.toStringAsFixed(1)} 米';
+  } else {
+    return '${(distance / 1000).toStringAsFixed(2)} 千米';
+  }
+}
+
+/// 获取两个坐标点的中点坐标（用于显示距离文本）
+LatLng _getMiddleLatLng(LatLng point1, LatLng point2) {
+  double middleLat = (point1.latitude + point2.latitude) / 2;
+  double middleLng = (point1.longitude + point2.longitude) / 2;
+  return LatLng(middleLat, middleLng);
+}