From 8f48ade9bfe39f10239fda0cac85c96c543643d1 Mon Sep 17 00:00:00 2001
From: ctw <1051735452@qq.com>
Date: Mon, 2 Feb 2026 11:25:22 +0800
Subject: [PATCH] =?UTF-8?q?=E7=9C=9F=E6=96=B9=E4=BD=8D=EF=BC=8C=E7=A3=81?=
 =?UTF-8?q?=E6=96=B9=E4=BD=8D=E6=98=BE=E7=A4=BA?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ruoyi-ui/src/views/cesiumMap/index.vue | 104 +++++++++++++++++++++++++++++++--
 1 file changed, 100 insertions(+), 4 deletions(-)

diff --git a/ruoyi-ui/src/views/cesiumMap/index.vue b/ruoyi-ui/src/views/cesiumMap/index.vue
index aa41e97..ab592a5 100644
--- a/ruoyi-ui/src/views/cesiumMap/index.vue
+++ b/ruoyi-ui/src/views/cesiumMap/index.vue
@@ -577,10 +577,15 @@ export default {
           // 如果是线实体，显示长度信息
           if (entityData && entityData.type === 'line') {
             const length = this.calculateLineLength(entityData.positions)
+            // 根据当前方位角类型计算方位角
+            const bearingType = entityData.bearingType || 'true';
+            const bearing = bearingType === 'magnetic' 
+              ? this.calculateMagneticBearing(entityData.positions) 
+              : this.calculateTrueBearing(entityData.positions);
             // 显示小框提示
             this.hoverTooltip = {
               visible: true,
-              content: `长度：${length.toFixed(2)} 米`,
+              content: `长度：${length.toFixed(2)} 米\n${bearingType === 'magnetic' ? '磁方位' : '真方位'}：${bearing.toFixed(2)}°`,
               position: {
                 x: movement.endPosition.x + 10,
                 y: movement.endPosition.y - 10
@@ -842,10 +847,12 @@ export default {
             // 计算从最后一个点到当前鼠标位置的线段长度
             const tempPositions = [...this.drawingPoints, newPosition];
             const length = this.calculateLineLength(tempPositions);
-            // 更新小框提示，显示实时长度
+            // 默认为真方位，因为绘制过程中还没有bearingType属性
+            const bearing = this.calculateTrueBearing(tempPositions);
+            // 更新小框提示，显示实时长度和真方位角
             this.hoverTooltip = {
               visible: true,
-              content: `长度：${length.toFixed(2)} 米`,
+              content: `长度：${length.toFixed(2)} 米\n真方位：${bearing.toFixed(2)}°`,
               position: {
                 x: movement.endPosition.x + 10,
                 y: movement.endPosition.y - 10
@@ -1959,7 +1966,8 @@ export default {
         pointEntities: pointEntities, // 存储点实体
         color: this.defaultStyles.line.color,
         width: this.defaultStyles.line.width,
-        label: `线 ${this.entityCounter}`
+        label: `线 ${this.entityCounter}`,
+        bearingType: 'true' // 默认真方位
       }
       this.allEntities.push(entityData)
       entity.clickHandler = (e) => {
@@ -2089,6 +2097,94 @@ export default {
       }
       return totalLength
     },
+    calculateTrueBearing(positions) {
+      if (!positions || positions.length < 2) {
+        return 0;
+      }
+      // 获取最后一段线段的两个端点
+      const startPos = positions[positions.length - 2];
+      const endPos = positions[positions.length - 1];
+      
+      // 将笛卡尔坐标转换为地理坐标
+      const startCartographic = Cesium.Cartographic.fromCartesian(startPos);
+      const endCartographic = Cesium.Cartographic.fromCartesian(endPos);
+      
+      // 转换为弧度
+      const startLat = startCartographic.latitude;
+      const startLng = startCartographic.longitude;
+      const endLat = endCartographic.latitude;
+      const endLng = endCartographic.longitude;
+      
+      // 计算真方位角
+      const dLng = endLng - startLng;
+      const y = Math.sin(dLng) * Math.cos(endLat);
+      const x = Math.cos(startLat) * Math.sin(endLat) - Math.sin(startLat) * Math.cos(endLat) * Math.cos(dLng);
+      let bearing = Math.atan2(y, x);
+      
+      // 转换为角度并调整到0-360范围
+      bearing = Cesium.Math.toDegrees(bearing);
+      return (bearing + 360) % 360;
+    },
+    // 计算磁偏角（简化模型）
+    calculateMagneticDeclination(lat, lng) {
+      // 注意：这是一个简化的磁偏角计算模型
+      // 实际应用中，应该使用更精确的模型，如 WMM (World Magnetic Model)
+      
+      // 转换为角度
+      const latDeg = Cesium.Math.toDegrees(lat);
+      const lngDeg = Cesium.Math.toDegrees(lng);
+      
+      // 简化的磁偏角计算（仅适用于中国地区）
+      // 实际值会随时间变化，此处为近似值
+      let declination;
+      
+      if (lngDeg >= 73 && lngDeg <= 135 && latDeg >= 18 && latDeg <= 53) {
+        // 中国地区简化磁偏角模型
+        // 基于2020年数据，每年约变化0.1度
+        const year = new Date().getFullYear();
+        const yearOffset = (year - 2020) * 0.1;
+        
+        if (lngDeg < 100) {
+          // 西部地区
+          declination = 2.0 - yearOffset;
+        } else if (lngDeg < 115) {
+          // 中部地区
+          declination = 1.0 - yearOffset;
+        } else {
+          // 东部地区
+          declination = 0.5 - yearOffset;
+        }
+      } else {
+        // 其他地区默认磁偏角为0
+        declination = 0;
+      }
+      
+      return declination;
+    },
+    // 计算磁方位角
+    calculateMagneticBearing(positions) {
+      if (!positions || positions.length < 2) {
+        return 0;
+      }
+      
+      // 计算真方位角
+      const trueBearing = this.calculateTrueBearing(positions);
+      
+      // 获取线段起点的地理坐标
+      const startPos = positions[positions.length - 2];
+      const startCartographic = Cesium.Cartographic.fromCartesian(startPos);
+      const startLat = startCartographic.latitude;
+      const startLng = startCartographic.longitude;
+      
+      // 计算磁偏角
+      const declination = this.calculateMagneticDeclination(startLat, startLng);
+      
+      // 计算磁方位角（真方位角加上磁偏角）
+      let magneticBearing = trueBearing + declination;
+      
+      // 调整到0-360范围
+      return (magneticBearing + 360) % 360;
+    },
     calculatePolygonArea(positions) {
       if (positions.length < 3) return 0
       let area = 0