行灰度功能添加

XplorePlane/Events/MeasurementToolEvent.cs

@@ -25,4 +25,9 @@ namespace XplorePlane.Events
     /// 十字辅助线切换事件
     /// </summary>
     public class ToggleCrosshairEvent : PubSubEvent { }
+
+    /// <summary>
+    /// 行灰度分布切换事件
+    /// </summary>
+    public class ToggleLineProfileEvent : PubSubEvent { }
 }

XplorePlane/ViewModels/Main/MainViewModel.cs

@@ -961,8 +961,8 @@ namespace XplorePlane.ViewModels
         private void ExecuteGrayscale()
         {
             if (!CheckImageLoaded()) return;
-            _logger.Info("Grayscale conversion triggered.");
+            _logger.Info("Line profile toggled.");
-            // TODO: 实现灰度转换逻辑
+            _eventAggregator.GetEvent<ToggleLineProfileEvent>().Publish();
         }
 
         private void ExecuteSharpen()

XplorePlane/Views/Main/ViewportPanelView.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using System.ComponentModel;
 using System.IO;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
@@ -128,8 +129,178 @@ namespace XplorePlane.Views
                 var vm = GetMainVm();
                 if (vm != null) vm.CursorInfoText = RoiCanvas.CursorInfo;
             });
+
+            // 行灰度分布
+            try
+            {
+                var ea2 = ContainerLocator.Current?.Resolve<Prism.Events.IEventAggregator>();
+                ea2?.GetEvent<ToggleLineProfileEvent>().Subscribe(() =>
+                {
+                    ToggleLineProfile();
+                }, Prism.Events.ThreadOption.UIThread);
+            }
+            catch { }
         }
 
+        #region 行灰度分布
+
+        private bool _lineProfileEnabled;
+        private System.Windows.Shapes.Line _profileRefLine;       // 透明命中区域
+        private System.Windows.Shapes.Line _profileRefLineVisible; // 1px红线显示
+        private System.Windows.Shapes.Polyline _profileCurve;
+        private double _profileLineY;
+        private bool _profileDragging;
+
+        private void ToggleLineProfile()
+        {
+            _lineProfileEnabled = !_lineProfileEnabled;
+            var canvas = FindChildByName<System.Windows.Controls.Canvas>(RoiCanvas, "mainCanvas");
+            if (canvas == null) return;
+
+            if (_lineProfileEnabled)
+            {
+                // 参考线默认在图像中间
+                _profileLineY = RoiCanvas.CanvasHeight / 2;
+
+                // 创建参考线（红色水平线，可拖动）
+                // 用透明粗线作为命中区域，叠加1px红线显示
+                _profileRefLine = new System.Windows.Shapes.Line
+                {
+                    X1 = 0,
+                    Y1 = _profileLineY,
+                    X2 = RoiCanvas.CanvasWidth,
+                    Y2 = _profileLineY,
+                    Stroke = System.Windows.Media.Brushes.Transparent,
+                    StrokeThickness = 7,  // 上下3px命中区域
+                    IsHitTestVisible = true,
+                    Cursor = System.Windows.Input.Cursors.SizeNS
+                };
+                _profileRefLineVisible = new System.Windows.Shapes.Line
+                {
+                    X1 = 0,
+                    Y1 = _profileLineY,
+                    X2 = RoiCanvas.CanvasWidth,
+                    Y2 = _profileLineY,
+                    Stroke = System.Windows.Media.Brushes.Red,
+                    StrokeThickness = 1,
+                    IsHitTestVisible = false
+                };
+                _profileRefLine.MouseLeftButtonDown += ProfileLine_MouseDown;
+                _profileRefLine.MouseMove += ProfileLine_MouseMove;
+                _profileRefLine.MouseLeftButtonUp += ProfileLine_MouseUp;
+                canvas.Children.Add(_profileRefLineVisible);
+                canvas.Children.Add(_profileRefLine);
+
+                // 创建灰度折线（固定显示在图像中间位置）
+                _profileCurve = new System.Windows.Shapes.Polyline
+                {
+                    Stroke = System.Windows.Media.Brushes.Red,
+                    StrokeThickness = 1,
+                    IsHitTestVisible = false
+                };
+                canvas.Children.Add(_profileCurve);
+
+                UpdateLineProfile();
+                SetStatus("行灰度分布：拖动红线改变采样行，再次点击按钮关闭");
+            }
+            else
+            {
+                if (_profileRefLine != null)
+                {
+                    canvas.Children.Remove(_profileRefLine);
+                    _profileRefLine = null;
+                }
+                if (_profileRefLineVisible != null)
+                {
+                    canvas.Children.Remove(_profileRefLineVisible);
+                    _profileRefLineVisible = null;
+                }
+                if (_profileCurve != null)
+                {
+                    canvas.Children.Remove(_profileCurve);
+                    _profileCurve = null;
+                }
+                SetStatus("行灰度分布已关闭");
+            }
+        }
+
+        private void ProfileLine_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+        {
+            _profileDragging = true;
+            _profileRefLine?.CaptureMouse();
+            e.Handled = true;
+        }
+
+        private void ProfileLine_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
+        {
+            if (!_profileDragging || _profileRefLine == null) return;
+
+            var canvas = FindChildByName<System.Windows.Controls.Canvas>(RoiCanvas, "mainCanvas");
+            if (canvas == null) return;
+
+            var pos = e.GetPosition(canvas);
+            _profileLineY = Math.Clamp(pos.Y, 0, RoiCanvas.CanvasHeight - 1);
+
+            _profileRefLine.Y1 = _profileLineY;
+            _profileRefLine.Y2 = _profileLineY;
+            _profileRefLineVisible.Y1 = _profileLineY;
+            _profileRefLineVisible.Y2 = _profileLineY;
+
+            UpdateLineProfile();
+        }
+
+        private void ProfileLine_MouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
+        {
+            _profileDragging = false;
+            _profileRefLine?.ReleaseMouseCapture();
+            e.Handled = true;
+        }
+
+        private void UpdateLineProfile()
+        {
+            if (_profileCurve == null) return;
+
+            // 从当前显示图像获取像素数据
+            var viewportVm = DataContext as ViewportPanelViewModel;
+            var imageSource = viewportVm?.ImageSource as System.Windows.Media.Imaging.BitmapSource;
+            if (imageSource == null) return;
+
+            int imgWidth = imageSource.PixelWidth;
+            int imgHeight = imageSource.PixelHeight;
+            int row = (int)Math.Clamp(_profileLineY, 0, imgHeight - 1);
+
+            // 转为 Gray8 获取行像素
+            System.Windows.Media.Imaging.BitmapSource gray8;
+            if (imageSource.Format != System.Windows.Media.PixelFormats.Gray8)
+                gray8 = new System.Windows.Media.Imaging.FormatConvertedBitmap(
+                    imageSource, System.Windows.Media.PixelFormats.Gray8, null, 0);
+            else
+                gray8 = imageSource;
+
+            byte[] rowPixels = new byte[imgWidth];
+            int stride = imgWidth;
+            gray8.CopyPixels(new System.Windows.Int32Rect(0, row, imgWidth, 1), rowPixels, stride, 0);
+
+            // 构建折线点集：折线固定显示在图像垂直中间位置
+            // 参考线位置决定采样哪一行，折线位置固定在画布中间
+            double canvasH = RoiCanvas.CanvasHeight;
+            double curveCenter = canvasH / 2.0; // 折线基线固定在图像中间
+            double displayHeight = canvasH * 0.25; // 折线振幅为画布高度的25%
+
+            var points = new System.Windows.Media.PointCollection(imgWidth);
+            for (int x = 0; x < imgWidth; x++)
+            {
+                double normalizedGray = rowPixels[x] / 255.0;
+                double y = curveCenter - normalizedGray * displayHeight;
+                points.Add(new System.Windows.Point(x, y));
+            }
+            _profileCurve.Points = points;
+
+            SetStatus($"行灰度分布 | Y={row} | 均值={rowPixels.Select(b => (double)b).Average():F1} | 最大={rowPixels.Max()} | 最小={rowPixels.Min()}");
+        }
+
+        #endregion
+
         private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
         {
             if (e.OldValue is INotifyPropertyChanged oldVm)