fix

Views/UserControl/Viewport3D.xaml

@@ -74,7 +74,6 @@
                             PreviewMouseRightButtonUp="UIElement_OnPreviewMouseRightButtonUp" 
                             PreviewMouseRightButtonDown="UIElement_OnPreviewMouseRightButtonDown" 
                             PreviewMouseMove="Viewport3Dx_OnPreviewMouseMove"
-                            MouseLeftButtonDown="Viewport3Dx_MouseLeftButtonDown"
                             MouseDoubleClick="Viewport3Dx_OnMouseLeftButtonDown">
                 <hx:Viewport3DX.EffectsManager><hx:EffectsManager ></hx:EffectsManager></hx:Viewport3DX.EffectsManager>
                 <hx:Viewport3DX.InputBindings>

Views/UserControl/Viewport3D.xaml.cs

@@ -596,28 +596,4 @@ public partial class Viewport3D
         //Viewport3Dx.ShowTriangleCountInfo = !Viewport3Dx.ShowTriangleCountInfo;
     }
 
-    private void Viewport3Dx_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
-    {
-        var mousePosition = e.GetPosition(Viewport3Dx);
-        var hits = Viewport3Dx.FindHits(mousePosition);
-        // 如果没有命中任何 3D 对象
-        //if (hits == null || hits.Count == 0)
-        //{
-        //    ViewportManager.ClearDicModels();
-        //    return;
-        //}
-        //var hit = hits[0];
-        //// 检查是否是 MeshGeometryModel3D
-        //if (hit.ModelHit is LineGeometryModel3D modelHit)
-        //{
-        //    // 获取几何信息
-        //    if (modelHit != null)
-        //    {
-        //    }
-        //}
-        //else
-        //{
-        //    ViewportManager.ClearDicModels();
-        //}
-    }
 }

Views/UserControl/ViewportData/Helper/ViewportHelperPro.cs

@@ -1,29 +1,23 @@
-using System.Collections.Frozen;
 using System.Collections.ObjectModel;
-using System.Diagnostics;
-using System.Drawing.Text;
 using System.IO;
-using System.Text.Json.Nodes;
 using System.Windows;
 using System.Windows.Media;
 using System.Windows.Media.Animation;
 using System.Windows.Media.Imaging;
 using System.Windows.Media.Media3D;
-using System.Windows.Threading;
-using HandyControl.Controls;
 using HelixToolkit.Wpf.SharpDX;
 using log4net;
-using NPOI.OpenXmlFormats.Vml.Office;
 using SharpDX;
 using SharpDX.Direct3D11;
-using SharpDX.DXGI;
 using SparkClient.Views.UserControl.ViewportData.Enum;
 using SparkClient.Views.UserControl.ViewportData.Entity;
 using Color = SharpDX.Color;
 using GeometryModel3D = HelixToolkit.Wpf.SharpDX.GeometryModel3D;
-using NPOI.SS.Formula.Functions;
 using MeshGeometry3D = HelixToolkit.Wpf.SharpDX.MeshGeometry3D;
-using NPOI.SS.UserModel;
+using Point = System.Windows.Point;
+using PerspectiveCamera = HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+using System.Windows.Controls;
+
 
 namespace SparkClient.Views.UserControl.ViewportData.Helper;
 
@@ -1331,7 +1325,8 @@ public class ViewportHelperPro
         return lines;
     }
     private static bool isDrawing = false;
-    private static Vector3 startpoint;
+    private static Point3D previousMousePosition;
+    private static  Vector3D _totalTranslation = new Vector3D(0, 0, 0);
     private static void LineA_MouseMove3D(object sender, RoutedEventArgs e)
     {
         if (isDrawing)
@@ -1339,15 +1334,40 @@ public class ViewportHelperPro
             if (e is HelixToolkit.Wpf.SharpDX.MouseMove3DEventArgs ev)
             {
                 var line = sender as LineGeometryModel3D;
-                var newPoint = ev.HitTestResult.PointHit;
+                var mousePosition = ev.Position;
-                var moveDirection = newPoint - startpoint;
+                var hitResult = ev.Viewport.FindNearestPoint(mousePosition);
+                if (hitResult == null)
+                {
+                    return;
+                }
                 var lineDirection = line.Geometry.Positions[1] - line.Geometry.Positions[0];
+                lineDirection.Normalize();
 
-                var perpendicularDirection = Vector3.Cross(lineDirection, Vector3.Cross(moveDirection, lineDirection));
+                Vector3D referenceVector = new Vector3D(0, 1, 0);
+                Vector3D perpendicularDirection = Vector3D.CrossProduct(lineDirection.ToVector3D(), referenceVector);
                 perpendicularDirection.Normalize();
 
-                line.Geometry.Positions[0] += perpendicularDirection * Vector3.Dot(moveDirection, perpendicularDirection);
+                var currentMousePosition = Get3DPointFromMouse(mousePosition, ev.Viewport);
-                line.Geometry.Positions[1] += perpendicularDirection * Vector3.Dot(moveDirection, perpendicularDirection);
+                //// 计算垂直于线的移动分量
+                //var perpendicularDirection = Vector3.Cross(lineDirection, Vector3.Cross(moveDirection,lineDirection));
+                //perpendicularDirection.Normalize();
+
+                var point = hitResult.Value;
+
+                var dragVector = point - ev.HitTestResult.PointHit.ToPoint3D();
+                double dotProduct = Vector3D.DotProduct(dragVector, perpendicularDirection);
+                Vector3D projectedVector = dotProduct * perpendicularDirection;
+                projectedVector.Y = 0;
+                //// 计算垂直距离
+                //float perpendicularDistance = Vector3.Dot(moveDirection, perpendicularDirection);
+
+                //line.Geometry.Positions[0] += perpendicularDirection * perpendicularDistance;
+
+                //line.Geometry.Positions[1] += perpendicularDirection * perpendicularDistance;
+
+                _totalTranslation += projectedVector;
+                var transform = new TranslateTransform3D(projectedVector);
+                line.Transform = transform;
             }
         }
     }
@@ -1361,10 +1381,36 @@ public class ViewportHelperPro
     {
         isDrawing = true;
         if(e is HelixToolkit.Wpf.SharpDX.MouseDown3DEventArgs ev){
-            startpoint = ev.HitTestResult.PointHit;
+            // 获取鼠标点击的位置
+            var mousePosition = ev.Position;
+            var a = ev.Viewport;
+            previousMousePosition = Get3DPointFromMouse(mousePosition, a);
+
+            var line = sender as LineGeometryModel3D;
+            //var transform = new TranslateTransform3D(10, 0, 10);
+            //line.Transform = transform;
+
         }
     }
+    private static Point3D Get3DPointFromMouse(Point mousePosition, Viewport3DX Viewport)
+    {
+        // 将2D屏幕坐标转换为3D世界坐标
+        var ray = GetRayFromMouse(mousePosition, Viewport);
+        var plane = new Plane3D(new Point3D(0, 0, 0), new Vector3D(0, 0, 1)); // 假设平面为Z=0
+        var intersection = plane.IntersectWith(ray);
+
+        return intersection ?? new Point3D(0, 0, 0);
+    }
+
+    private static Ray3D GetRayFromMouse(Point mousePosition, Viewport3DX Viewport)
+    {
+        // 获取从相机发出的射线
+        var camera = Viewport.Camera as PerspectiveCamera;
+        var rayDirection = new Vector3D(mousePosition.X - Viewport.ActualWidth / 2, -(mousePosition.Y - Viewport.ActualHeight / 2), -camera.Position.Z);
+        rayDirection.Normalize();
 
+        return new Ray3D(camera.Position, rayDirection);
+    }
 
     public static LineGeometryModel3D ShowCircleLine(double radius = 1.0, double thickness = 1.0)
     {
@@ -1652,3 +1698,38 @@ public class ViewportHelperPro
     #endregion
 
 }
+
+// 辅助类：表示3D射线
+public class Ray3D
+{
+    public Point3D Origin { get; }
+    public Vector3D Direction { get; }
+
+    public Ray3D(Point3D origin, Vector3D direction)
+    {
+        Origin = origin;
+        Direction = direction;
+    }
+}
+
+// 辅助类：表示3D平面
+public class Plane3D
+{
+    public Point3D Point { get; }
+    public Vector3D Normal { get; }
+
+    public Plane3D(Point3D point, Vector3D normal)
+    {
+        Point = point;
+        Normal = normal;
+    }
+
+    public Point3D? IntersectWith(Ray3D ray)
+    {
+        var denominator = Vector3D.DotProduct(ray.Direction, Normal);
+        if (Math.Abs(denominator) < 1e-6) return null; // 平行，无交点
+
+        var t = Vector3D.DotProduct(Point - ray.Origin, Normal) / denominator;
+        return ray.Origin + t * ray.Direction;
+    }
+}