using XP.ImageProcessing.RoiControl.Models;
using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace XP.ImageProcessing.RoiControl.Controls
{
    public partial class PolygonRoiCanvas : UserControl
    {
        private bool isDragging = false;
        private Point lastMousePosition;
        private const double ZoomStep = 1.2;
        private Adorner? currentAdorner;

        public PolygonRoiCanvas()
        {
            InitializeComponent();
            Loaded += PolygonRoiCanvas_Loaded;
        }

        private void PolygonRoiCanvas_Loaded(object sender, RoutedEventArgs e)
        {
            // 监听ROI集合变化
            if (ROIItems != null)
            {
                ROIItems.CollectionChanged += ROIItems_CollectionChanged;
                foreach (var roi in ROIItems)
                {
                    roi.PropertyChanged += ROI_PropertyChanged;

                    // 如果是多边形ROI，监听Points集合变化
                    if (roi is PolygonROI polygonROI)
                    {
                        polygonROI.Points.CollectionChanged += Points_CollectionChanged;
                    }
                }
            }
        }

        private void ROIItems_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.NewItems != null)
            {
                foreach (ROIShape roi in e.NewItems)
                {
                    roi.PropertyChanged += ROI_PropertyChanged;

                    // 如果是多边形ROI，监听Points集合变化
                    if (roi is PolygonROI polygonROI)
                    {
                        polygonROI.Points.CollectionChanged += Points_CollectionChanged;
                    }
                }
            }
            if (e.OldItems != null)
            {
                foreach (ROIShape roi in e.OldItems)
                {
                    roi.PropertyChanged -= ROI_PropertyChanged;

                    // 取消监听Points集合变化
                    if (roi is PolygonROI polygonROI)
                    {
                        polygonROI.Points.CollectionChanged -= Points_CollectionChanged;
                    }
                }
            }
        }

        private void Points_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            // 只在删除或添加顶点时更新Adorner，拖拽时的Replace操作不触发更新
            if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove ||
                e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
            {
                // Points集合变化时，如果当前选中的是多边形ROI，更新Adorner
                if (SelectedROI is PolygonROI polygonROI && sender == polygonROI.Points)
                {
                    // 使用Dispatcher延迟更新，确保UI已经处理完Points的变化
                    Dispatcher.BeginInvoke(new Action(() =>
                    {
                        UpdateAdorner();
                    }), System.Windows.Threading.DispatcherPriority.Render);
                }
            }
            // Replace操作（拖拽时）不需要重建Adorner，只需要让现有Adorner重新布局
        }

        private void ROI_PropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(ROIShape.IsSelected))
            {
                UpdateAdorner();
            }
            // 监听Points属性变化（整个集合替换的情况）
            else if (e.PropertyName == "Points" && sender is PolygonROI)
            {
                UpdateAdorner();
            }
        }

        #region Dependency Properties

        public static readonly DependencyProperty ImageSourceProperty =
            DependencyProperty.Register(nameof(ImageSource), typeof(ImageSource), typeof(PolygonRoiCanvas),
                new PropertyMetadata(null, OnImageSourceChanged));

        public ImageSource? ImageSource
        {
            get => (ImageSource?)GetValue(ImageSourceProperty);
            set => SetValue(ImageSourceProperty, value);
        }

        private static void OnImageSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (PolygonRoiCanvas)d;
            if (e.NewValue is BitmapSource bitmap)
            {
                // 使用像素尺寸，避免 DPI 不同导致 DIP 尺寸与实际像素不一致
                control.CanvasWidth = bitmap.PixelWidth;
                control.CanvasHeight = bitmap.PixelHeight;
                control.ResetView();
            }
            else if (e.NewValue is ImageSource imageSource)
            {
                control.CanvasWidth = imageSource.Width;
                control.CanvasHeight = imageSource.Height;
                control.ResetView();
            }

            // 图像尺寸变化后刷新十字线
            if (control.ShowCrosshair)
                control.AddCrosshair();
        }

        public static readonly DependencyProperty ROIItemsProperty =
            DependencyProperty.Register(nameof(ROIItems), typeof(ObservableCollection<ROIShape>), typeof(PolygonRoiCanvas),
                new PropertyMetadata(null));

        public ObservableCollection<ROIShape>? ROIItems
        {
            get => (ObservableCollection<ROIShape>?)GetValue(ROIItemsProperty);
            set => SetValue(ROIItemsProperty, value);
        }

        public static readonly DependencyProperty ZoomScaleProperty =
            DependencyProperty.Register(nameof(ZoomScale), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(1.0, OnZoomScaleChanged));

        public double ZoomScale
        {
            get => (double)GetValue(ZoomScaleProperty);
            set => SetValue(ZoomScaleProperty, Math.Max(0.1, Math.Min(10.0, value)));
        }

        private static void OnZoomScaleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (PolygonRoiCanvas)d;
            // 缩放变化时更新Adorner以调整控制点大小
            control.UpdateAdorner();
        }

        public static readonly DependencyProperty PanOffsetXProperty =
            DependencyProperty.Register(nameof(PanOffsetX), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(0.0, OnPanOffsetChanged));

        public double PanOffsetX
        {
            get => (double)GetValue(PanOffsetXProperty);
            set => SetValue(PanOffsetXProperty, value);
        }

        public static readonly DependencyProperty PanOffsetYProperty =
            DependencyProperty.Register(nameof(PanOffsetY), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(0.0, OnPanOffsetChanged));

        public double PanOffsetY
        {
            get => (double)GetValue(PanOffsetYProperty);
            set => SetValue(PanOffsetYProperty, value);
        }

        private static void OnPanOffsetChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (PolygonRoiCanvas)d;

            // 平移时重建Adorner，确保控制点位置正确
            if (control.SelectedROI != null && control.SelectedROI.IsSelected)
            {
                control.UpdateAdorner();
            }
        }

        public static readonly DependencyProperty CanvasWidthProperty =
            DependencyProperty.Register(nameof(CanvasWidth), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(800.0));

        public double CanvasWidth
        {
            get => (double)GetValue(CanvasWidthProperty);
            set => SetValue(CanvasWidthProperty, value);
        }

        public static readonly DependencyProperty CanvasHeightProperty =
            DependencyProperty.Register(nameof(CanvasHeight), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(600.0));

        public double CanvasHeight
        {
            get => (double)GetValue(CanvasHeightProperty);
            set => SetValue(CanvasHeightProperty, value);
        }

        public static readonly DependencyProperty SelectedROIProperty =
            DependencyProperty.Register(nameof(SelectedROI), typeof(ROIShape), typeof(PolygonRoiCanvas),
                new PropertyMetadata(null, OnSelectedROIChanged));

        public ROIShape? SelectedROI
        {
            get => (ROIShape?)GetValue(SelectedROIProperty);
            set => SetValue(SelectedROIProperty, value);
        }

        private static void OnSelectedROIChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (PolygonRoiCanvas)d;

            // 更新IsSelected状态
            if (e.OldValue is ROIShape oldROI)
            {
                oldROI.IsSelected = false;
            }
            if (e.NewValue is ROIShape newROI)
            {
                newROI.IsSelected = true;
            }

            control.UpdateAdorner();
        }

        #endregion Dependency Properties

        #region Measurement Config

        public static readonly DependencyProperty PixelSizeProperty =
            DependencyProperty.Register(nameof(PixelSize), typeof(double), typeof(PolygonRoiCanvas),
                new PropertyMetadata(1.0));

        /// <summary>每像素对应的物理尺寸（= 探测器像素尺寸 / 放大倍率），默认 1.0</summary>
        public double PixelSize
        {
            get => (double)GetValue(PixelSizeProperty);
            set => SetValue(PixelSizeProperty, value);
        }

        public static readonly DependencyProperty MeasureUnitProperty =
            DependencyProperty.Register(nameof(MeasureUnit), typeof(string), typeof(PolygonRoiCanvas),
                new PropertyMetadata("px"));

        /// <summary>测量单位，默认 "px"，可设为 "mm"/"μm"/"cm"</summary>
        public string MeasureUnit
        {
            get => (string)GetValue(MeasureUnitProperty);
            set => SetValue(MeasureUnitProperty, value);
        }

        /// <summary>将像素距离转换为物理距离文本</summary>
        internal string FormatDistance(double pixelDistance)
        {
            string unit = MeasureUnit ?? "px";
            if (unit == "px" || PixelSize <= 0 || PixelSize == 1.0)
                return $"{pixelDistance:F2} px";
            double physical = pixelDistance * PixelSize;
            return $"{physical:F4} {unit}";
        }

        #endregion Measurement Config

        #region Crosshair

        public static readonly DependencyProperty ShowCrosshairProperty =
            DependencyProperty.Register(nameof(ShowCrosshair), typeof(bool), typeof(PolygonRoiCanvas),
                new PropertyMetadata(false, OnShowCrosshairChanged));

        public bool ShowCrosshair
        {
            get => (bool)GetValue(ShowCrosshairProperty);
            set => SetValue(ShowCrosshairProperty, value);
        }

        private Line _crosshairH, _crosshairV;

        private static void OnShowCrosshairChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var c = (PolygonRoiCanvas)d;
            if ((bool)e.NewValue)
                c.AddCrosshair();
            else
                c.RemoveCrosshair();
        }

        private void AddCrosshair()
        {
            RemoveCrosshair();
            double w = CanvasWidth, h = CanvasHeight;
            if (w <= 0 || h <= 0) return;

            _crosshairH = new Line { X1 = 0, Y1 = h / 2, X2 = w, Y2 = h / 2, Stroke = Brushes.Red, StrokeThickness = 1, Opacity = 0.7, IsHitTestVisible = false };
            _crosshairV = new Line { X1 = w / 2, Y1 = 0, X2 = w / 2, Y2 = h, Stroke = Brushes.Red, StrokeThickness = 1, Opacity = 0.7, IsHitTestVisible = false };
            mainCanvas.Children.Add(_crosshairH);
            mainCanvas.Children.Add(_crosshairV);
        }

        private void RemoveCrosshair()
        {
            if (_crosshairH != null) { mainCanvas.Children.Remove(_crosshairH); _crosshairH = null; }
            if (_crosshairV != null) { mainCanvas.Children.Remove(_crosshairV); _crosshairV = null; }
        }

        #endregion Crosshair

        #region Measurement

        public static readonly DependencyProperty CurrentMeasureModeProperty =
            DependencyProperty.Register(nameof(CurrentMeasureMode), typeof(Models.MeasureMode), typeof(PolygonRoiCanvas),
                new PropertyMetadata(Models.MeasureMode.None, OnMeasureModeChanged));

        public Models.MeasureMode CurrentMeasureMode
        {
            get => (Models.MeasureMode)GetValue(CurrentMeasureModeProperty);
            set => SetValue(CurrentMeasureModeProperty, value);
        }

        // 保留 IsMeasuring 作为便捷属性
        public bool IsMeasuring => CurrentMeasureMode != Models.MeasureMode.None;

        private Canvas _measureOverlay;
        private readonly System.Collections.Generic.List<Models.MeasureGroup> _ppGroups = new();
        private readonly System.Collections.Generic.List<Models.PointToLineGroup> _ptlGroups = new();
        private readonly System.Collections.Generic.List<Models.AngleGroup> _angleGroups = new();
        private readonly System.Collections.Generic.List<Models.FillRateGroup> _frGroups = new();
        private readonly System.Collections.Generic.List<Models.BgaVoidGroup> _bgaGroups = new();

        // 点点距临时状态
        private Ellipse _pendingDot;
        private Point? _pendingPoint;

        // 点线距临时状态
        private int _ptlClickCount;
        private Ellipse _ptlTempDot1, _ptlTempDot2;
        private Line _ptlTempLine;
        private Point? _ptlTempL1, _ptlTempL2;

        // 角度测量临时状态
        private int _angleClickCount;
        private Ellipse _angleTempVDot, _angleTempADot;
        private Line _angleTempLineA;
        private Point? _angleTempV, _angleTempA;

        // BGA 空隙测量状态
        private Models.BgaVoidGroup _bgaCurrent;  // 当前正在编辑的 BGA 组
        private bool _bgaDrawBall;                 // true=画焊球, false=画气泡
        private Point? _bgaPendingCenter;          // 等待第二次点击定半径
        private Ellipse _bgaPendingDot;

        // 气泡测量状态
        public enum BubbleSubTool { Roi, Wand, Brush, Eraser }
        private BubbleSubTool _bubbleTool = BubbleSubTool.Roi;
        private Rectangle _bubbleRoiRect;
        private Ellipse _bubbleRoiHandle;          // 右下角调整手柄
        private Rect? _bubbleRoi;
        private Point? _bubbleRoiStart;
        private bool _bubbleRoiDragging;
        private bool _bubbleRoiMoving;             // 拖动整个 ROI
        private bool _bubbleRoiResizing;           // 右下角调整大小
        private Point _bubbleRoiDragOffset;
        private Image _bubbleMaskImage;
        private System.Windows.Media.Imaging.WriteableBitmap _bubbleMask;
        private int _bubbleThreshold = 128;
        private int _bubbleBrushSize = 5;
        private bool _bubbleBrushDragging;

        public void SetBubbleTool(BubbleSubTool tool) => _bubbleTool = tool;
        public void SetBubbleThreshold(int val) => _bubbleThreshold = val;
        public void SetBubbleBrushSize(int val) => _bubbleBrushSize = val;
        public Rect? BubbleRoi => _bubbleRoi;

        // 拖拽状态
        private Ellipse _mDraggingDot;
        private object _mDraggingOwner;
        private string _mDraggingRole;

        private static void OnMeasureModeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var c = (PolygonRoiCanvas)d;
            var newMode = (Models.MeasureMode)e.NewValue;
            if (newMode != Models.MeasureMode.None)
            {
                c.EnsureMeasureOverlay();
            }
            else
            {
                // 退出测量模式：清除未完成的临时元素
                c.ClearPendingElements();
            }
        }

        private void ClearPendingElements()
        {
            if (_measureOverlay == null) return;
            if (_pendingDot != null) { _measureOverlay.Children.Remove(_pendingDot); _pendingDot = null; }
            _pendingPoint = null;
            if (_ptlTempDot1 != null) { _measureOverlay.Children.Remove(_ptlTempDot1); _ptlTempDot1 = null; }
            if (_ptlTempDot2 != null) { _measureOverlay.Children.Remove(_ptlTempDot2); _ptlTempDot2 = null; }
            if (_ptlTempLine != null) { _measureOverlay.Children.Remove(_ptlTempLine); _ptlTempLine = null; }
            _ptlTempL1 = _ptlTempL2 = null; _ptlClickCount = 0;
            if (_angleTempVDot != null) { _measureOverlay.Children.Remove(_angleTempVDot); _angleTempVDot = null; }
            if (_angleTempADot != null) { _measureOverlay.Children.Remove(_angleTempADot); _angleTempADot = null; }
            if (_angleTempLineA != null) { _measureOverlay.Children.Remove(_angleTempLineA); _angleTempLineA = null; }
            _angleTempV = _angleTempA = null; _angleClickCount = 0;
            if (_bgaPendingDot != null) { _measureOverlay.Children.Remove(_bgaPendingDot); _bgaPendingDot = null; }
            _bgaPendingCenter = null;
        }

        private void EnsureMeasureOverlay()
        {
            if (_measureOverlay != null) return;
            _measureOverlay = new Canvas { IsHitTestVisible = true, Background = Brushes.Transparent };
            _measureOverlay.SetBinding(Canvas.WidthProperty, new System.Windows.Data.Binding("CanvasWidth") { Source = this });
            _measureOverlay.SetBinding(Canvas.HeightProperty, new System.Windows.Data.Binding("CanvasHeight") { Source = this });
            mainCanvas.Children.Add(_measureOverlay);
        }

        private void RemoveMeasureOverlay()
        {
            if (_measureOverlay != null) { mainCanvas.Children.Remove(_measureOverlay); _measureOverlay = null; }
            _ppGroups.Clear(); _ptlGroups.Clear(); _angleGroups.Clear(); _frGroups.Clear(); _bgaGroups.Clear();
            _pendingDot = null; _pendingPoint = null;
            _ptlTempDot1 = _ptlTempDot2 = null; _ptlTempLine = null;
            _ptlTempL1 = _ptlTempL2 = null; _ptlClickCount = 0;
            _angleTempVDot = _angleTempADot = null; _angleTempLineA = null;
            _angleTempV = _angleTempA = null; _angleClickCount = 0;
            _mDraggingDot = null; _mDraggingOwner = null;
        }

        public void ClearMeasurements() => RemoveMeasureOverlay();
        public int MeasureCount => _ppGroups.Count + _ptlGroups.Count + _angleGroups.Count + _frGroups.Count + _bgaGroups.Count;

        // ── 点击分发 ──

        private void HandleMeasureClick(Point pos)
        {
            if (_measureOverlay == null) EnsureMeasureOverlay();
            if (_measureOverlay == null) return;

            if (CurrentMeasureMode == Models.MeasureMode.PointDistance)
                HandlePointDistanceClick(pos);
            else if (CurrentMeasureMode == Models.MeasureMode.PointToLine)
                HandlePointToLineClick(pos);
            else if (CurrentMeasureMode == Models.MeasureMode.Angle)
                HandleAngleClick(pos);
            else if (CurrentMeasureMode == Models.MeasureMode.FillRate)
                HandleFillRateClick(pos);
            else if (CurrentMeasureMode == Models.MeasureMode.BgaVoid)
                HandleBgaVoidClick(pos);
            // BubbleMeasure 的点击在 MouseDown/Move/Up 中处理（拖拽画 ROI 和画笔）
        }

        // ── 点点距 ──

        private void HandlePointDistanceClick(Point pos)
        {
            if (!_pendingPoint.HasValue)
            {
                _pendingPoint = pos;
                _pendingDot = CreateMDot(Brushes.Red);
                _measureOverlay.Children.Add(_pendingDot);
                SetDotPos(_pendingDot, pos);
                RaiseMeasureStatusChanged($"点点距 - 第一点: ({pos.X:F0}, {pos.Y:F0})，请点击第二个点");
            }
            else
            {
                var g = CreatePPGroup(_pendingPoint.Value, pos);
                _ppGroups.Add(g);
                _measureOverlay.Children.Remove(_pendingDot);
                RenumberAll();
                _pendingDot = null; _pendingPoint = null;
                RaiseMeasureCompleted(g.P1, g.P2, g.Distance, MeasureCount, "PointDistance");
                CurrentMeasureMode = Models.MeasureMode.None;
            }
        }

        private Models.MeasureGroup CreatePPGroup(Point p1, Point p2)
        {
            var g = new Models.MeasureGroup { P1 = p1, P2 = p2 };
            g.Line = new Line { Stroke = Brushes.Lime, StrokeThickness = 2, IsHitTestVisible = false };
            g.Label = new TextBlock { Foreground = Brushes.Yellow, FontSize = 13, FontWeight = FontWeights.Bold, IsHitTestVisible = false };
            g.Dot1 = CreateMDot(Brushes.Red);
            g.Dot2 = CreateMDot(Brushes.Blue);
            foreach (UIElement el in new UIElement[] { g.Line, g.Label, g.Dot1, g.Dot2 })
                _measureOverlay.Children.Add(el);
            SetDotPos(g.Dot1, p1); SetDotPos(g.Dot2, p2);
            g.UpdateLine(); g.UpdateLabel(FormatDistance(g.Distance));
            return g;
        }

        // ── 点线距 ──

        private void HandlePointToLineClick(Point pos)
        {
            _ptlClickCount++;

            if (_ptlClickCount == 1)
            {
                _ptlTempL1 = pos;
                _ptlTempDot1 = CreateMDot(Brushes.Lime);
                _measureOverlay.Children.Add(_ptlTempDot1);
                SetDotPos(_ptlTempDot1, pos);
                RaiseMeasureStatusChanged($"点线距 - 直线端点1: ({pos.X:F0}, {pos.Y:F0})，请点击直线端点2");
            }
            else if (_ptlClickCount == 2)
            {
                _ptlTempL2 = pos;
                _ptlTempDot2 = CreateMDot(Brushes.Lime);
                _measureOverlay.Children.Add(_ptlTempDot2);
                SetDotPos(_ptlTempDot2, pos);
                _ptlTempLine = new Line { Stroke = Brushes.Lime, StrokeThickness = 2, IsHitTestVisible = false,
                    X1 = _ptlTempL1.Value.X, Y1 = _ptlTempL1.Value.Y, X2 = pos.X, Y2 = pos.Y };
                _measureOverlay.Children.Add(_ptlTempLine);
                RaiseMeasureStatusChanged($"点线距 - 直线已定义，请点击测量点");
            }
            else if (_ptlClickCount == 3)
            {
                // 完成：创建正式组，移除临时元素
                var g = CreatePTLGroup(_ptlTempL1.Value, _ptlTempL2.Value, pos);
                _ptlGroups.Add(g);
                RenumberAll();
                if (_ptlTempDot1 != null) _measureOverlay.Children.Remove(_ptlTempDot1);
                if (_ptlTempDot2 != null) _measureOverlay.Children.Remove(_ptlTempDot2);
                if (_ptlTempLine != null) _measureOverlay.Children.Remove(_ptlTempLine);
                _ptlTempDot1 = _ptlTempDot2 = null; _ptlTempLine = null;
                _ptlTempL1 = _ptlTempL2 = null; _ptlClickCount = 0;

                var foot = g.FootPoint;
                RaiseMeasureCompleted(g.P, foot, g.Distance, MeasureCount, "PointToLine");
                CurrentMeasureMode = Models.MeasureMode.None;
            }
        }

        private Models.PointToLineGroup CreatePTLGroup(Point l1, Point l2, Point p)
        {
            var g = new Models.PointToLineGroup { L1 = l1, L2 = l2, P = p };
            g.MainLine = new Line { Stroke = Brushes.Lime, StrokeThickness = 2, IsHitTestVisible = false };
            g.ExtLine = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false,
                StrokeDashArray = new DoubleCollection { 4, 2 }, Visibility = Visibility.Collapsed };
            g.PerpLine = new Line { Stroke = Brushes.Yellow, StrokeThickness = 1, IsHitTestVisible = false,
                StrokeDashArray = new DoubleCollection { 4, 2 } };
            g.FootDot = new Ellipse { Width = 8, Height = 8, Fill = Brushes.Cyan, Stroke = Brushes.White, StrokeThickness = 1, IsHitTestVisible = false };
            g.Label = new TextBlock { Foreground = Brushes.Yellow, FontSize = 13, FontWeight = FontWeights.Bold, IsHitTestVisible = false };
            g.DotL1 = CreateMDot(Brushes.Lime);
            g.DotL2 = CreateMDot(Brushes.Lime);
            g.DotP = CreateMDot(Brushes.Red);
            foreach (UIElement el in new UIElement[] { g.MainLine, g.ExtLine, g.PerpLine, g.FootDot, g.Label, g.DotL1, g.DotL2, g.DotP })
                _measureOverlay.Children.Add(el);
            SetDotPos(g.DotL1, l1); SetDotPos(g.DotL2, l2); SetDotPos(g.DotP, p);
            g.UpdateVisuals(FormatDistance(g.Distance));
            return g;
        }

        // ── 角度测量 ──

        private void HandleAngleClick(Point pos)
        {
            _angleClickCount++;

            if (_angleClickCount == 1)
            {
                _angleTempV = pos;
                _angleTempVDot = CreateMDot(Brushes.Red);
                _measureOverlay.Children.Add(_angleTempVDot);
                SetDotPos(_angleTempVDot, pos);
                RaiseMeasureStatusChanged($"角度测量 - 顶点: ({pos.X:F0}, {pos.Y:F0})，请点击射线端点A");
            }
            else if (_angleClickCount == 2)
            {
                _angleTempA = pos;
                _angleTempADot = CreateMDot(Brushes.Orange);
                _measureOverlay.Children.Add(_angleTempADot);
                SetDotPos(_angleTempADot, pos);
                _angleTempLineA = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false,
                    X1 = _angleTempV.Value.X, Y1 = _angleTempV.Value.Y, X2 = pos.X, Y2 = pos.Y };
                _measureOverlay.Children.Add(_angleTempLineA);
                RaiseMeasureStatusChanged($"角度测量 - 射线A已定义，请点击射线端点B");
            }
            else if (_angleClickCount == 3)
            {
                var g = CreateAngleGroup(_angleTempV.Value, _angleTempA.Value, pos);
                _angleGroups.Add(g);
                RenumberAll();

                // 移除临时元素
                if (_angleTempVDot != null) _measureOverlay.Children.Remove(_angleTempVDot);
                if (_angleTempADot != null) _measureOverlay.Children.Remove(_angleTempADot);
                if (_angleTempLineA != null) _measureOverlay.Children.Remove(_angleTempLineA);
                _angleTempVDot = _angleTempADot = null; _angleTempLineA = null;
                _angleTempV = _angleTempA = null; _angleClickCount = 0;

                RaiseMeasureCompleted(g.V, g.B, g.AngleDeg, MeasureCount, "Angle");
                CurrentMeasureMode = Models.MeasureMode.None;
            }
        }

        private Models.AngleGroup CreateAngleGroup(Point v, Point a, Point b)
        {
            var g = new Models.AngleGroup { V = v, A = a, B = b };
            g.LineA = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false };
            g.LineB = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false };
            g.Arc = new Path { Stroke = Brushes.Yellow, StrokeThickness = 1.5, IsHitTestVisible = false };
            g.Label = new TextBlock { Foreground = Brushes.Yellow, FontSize = 13, FontWeight = FontWeights.Bold, IsHitTestVisible = false };
            g.DotV = CreateMDot(Brushes.Red);
            g.DotA = CreateMDot(Brushes.Orange);
            g.DotB = CreateMDot(Brushes.Cyan);
            foreach (UIElement el in new UIElement[] { g.LineA, g.LineB, g.Arc, g.Label, g.DotV, g.DotA, g.DotB })
                _measureOverlay.Children.Add(el);
            SetDotPos(g.DotV, v); SetDotPos(g.DotA, a); SetDotPos(g.DotB, b);
            g.UpdateVisuals();
            return g;
        }

        // ── 通孔填锡率 ──

        private void HandleFillRateClick(Point pos)
        {
            // 单击放置：自动生成4个椭圆的初始位置
            double offset = 70;
            var e1 = new Point(pos.X, pos.Y + offset / 2);
            var e2 = new Point(pos.X + 20, pos.Y - offset / 2);
            var e3 = e1;  // 起点=底部
            var e4 = new Point(pos.X + 10, pos.Y - offset / 4);

            var g = CreateFillRateGroup(e1, e2, e3, e4);
            _frGroups.Add(g);
            RenumberAll();

            double rate = g.FillRate;
            RaiseMeasureCompleted(g.E3, g.E4, rate, MeasureCount, "FillRate");
            CurrentMeasureMode = Models.MeasureMode.None;
        }

        private Models.FillRateGroup CreateFillRateGroup(Point e1, Point e2, Point e3, Point e4)
        {
            var g = new Models.FillRateGroup { E1 = e1, E2 = e2, E3 = e3, E4 = e4 };

            g.PathE1 = CreateEllipsePath(Brushes.DodgerBlue, false);
            g.PathE2 = CreateEllipsePath(Brushes.Cyan, false);
            g.PathE3 = CreateEllipsePath(Brushes.Yellow, true);
            g.PathE4 = CreateEllipsePath(Brushes.Lime, false);

            g.FullLine = new Line { Stroke = Brushes.Red, StrokeThickness = 1, IsHitTestVisible = false };
            g.FillLine = new Line { Stroke = Brushes.Lime, StrokeThickness = 2, IsHitTestVisible = false };

            g.Label = new TextBlock { FontSize = 13, FontWeight = FontWeights.Bold, Cursor = Cursors.Hand };
            g.Label.SetValue(ContextMenuService.IsEnabledProperty, false);
            g.Label.PreviewMouseRightButtonUp += (s, ev) => { ShowTHTLimitEditor(g); ev.Handled = true; };

            g.DotE1 = CreateMDot(Brushes.DodgerBlue);
            g.DotE2 = CreateMDot(Brushes.Cyan);
            g.DotE3 = CreateMDot(Brushes.Yellow);
            g.DotE4 = CreateMDot(Brushes.Lime);

            // 轴手柄（小方块样式区分）
            g.E1AH = CreateAxisHandle(Brushes.DodgerBlue); g.E1BH = CreateAxisHandle(Brushes.DodgerBlue);
            g.E2AH = CreateAxisHandle(Brushes.Cyan);       g.E2BH = CreateAxisHandle(Brushes.Cyan);
            g.E3AH = CreateAxisHandle(Brushes.Yellow);     g.E3BH = CreateAxisHandle(Brushes.Yellow);
            g.E4AH = CreateAxisHandle(Brushes.Lime);       g.E4BH = CreateAxisHandle(Brushes.Lime);

            foreach (var el in g.AllElements)
                _measureOverlay.Children.Add(el);

            SetDotPos(g.DotE1, e1); SetDotPos(g.DotE2, e2);
            SetDotPos(g.DotE3, e3); SetDotPos(g.DotE4, e4);
            g.UpdateVisuals();
            return g;
        }

        private Ellipse CreateAxisHandle(Brush fill)
        {
            var h = new Ellipse { Width = 8, Height = 8, Fill = fill, Stroke = Brushes.White, StrokeThickness = 1, Cursor = Cursors.SizeAll };
            h.SetValue(ContextMenuService.IsEnabledProperty, false);
            h.MouseLeftButtonDown += MDot_Down;
            h.MouseMove += MDot_Move;
            h.MouseLeftButtonUp += MDot_Up;
            h.PreviewMouseRightButtonUp += MDot_RightClick;
            return h;
        }

        private static Path CreateEllipsePath(Brush stroke, bool dashed)
        {
            var p = new Path { Stroke = stroke, StrokeThickness = 1.5, IsHitTestVisible = false };
            if (dashed) p.StrokeDashArray = new DoubleCollection { 4, 2 };
            return p;
        }

        // ── BGA 空隙测量 ──

        private void HandleBgaVoidClick(Point pos)
        {
            if (_measureOverlay == null) EnsureMeasureOverlay();
            if (_measureOverlay == null) return;

            // 第一次进入：创建新的 BGA 组
            if (_bgaCurrent == null)
            {
                _bgaCurrent = new Models.BgaVoidGroup();
                var currentGroup = _bgaCurrent; // 局部变量供闭包捕获
                _bgaCurrent.Label = new TextBlock { FontSize = 13, FontWeight = FontWeights.Bold, Cursor = System.Windows.Input.Cursors.Hand, Visibility = Visibility.Collapsed };
                _bgaCurrent.Label.SetValue(ContextMenuService.IsEnabledProperty, false);
                _bgaCurrent.Label.PreviewMouseRightButtonUp += (s, ev) => { ShowBgaLimitEditor(currentGroup); ev.Handled = true; };
                _measureOverlay.Children.Add(_bgaCurrent.Label);
                _bgaDrawBall = false;
                RaiseMeasureStatusChanged("BGA空隙 - 点击画气泡圆心（右键切换为画焊球）");
            }

            if (!_bgaPendingCenter.HasValue)
            {
                // 第一次点击：圆心
                _bgaPendingCenter = pos;
                _bgaPendingDot = CreateMDot(_bgaDrawBall ? Brushes.Lime : Brushes.Orange);
                _measureOverlay.Children.Add(_bgaPendingDot);
                SetDotPos(_bgaPendingDot, pos);
                RaiseMeasureStatusChanged(_bgaDrawBall ? "BGA - 焊球圆心已定，点击边缘定半径" : "BGA - 气泡圆心已定，点击边缘定半径");
            }
            else
            {
                // 第二次点击：半径
                double r = Math.Max(5, Models.FillRateGroup.Dist(pos, _bgaPendingCenter.Value));
                var circle = CreateBgaCircle(_bgaPendingCenter.Value, r, _bgaDrawBall);

                if (_bgaDrawBall)
                {
                    // 如果已有焊球，移除旧的
                    if (_bgaCurrent.Ball != null)
                    {
                        _measureOverlay.Children.Remove(_bgaCurrent.Ball.Shape);
                        _measureOverlay.Children.Remove(_bgaCurrent.Ball.CenterDot);
                        _measureOverlay.Children.Remove(_bgaCurrent.Ball.EdgeDot);
                    }
                    _bgaCurrent.Ball = circle;
                    // 画完焊球 → 完成本组，计算结果
                    _bgaGroups.Add(_bgaCurrent);
                    RenumberAll();
                    _bgaCurrent.UpdateLabel();
                    _bgaCurrent.Label.Cursor = System.Windows.Input.Cursors.Hand;
                    RaiseMeasureCompleted(_bgaCurrent.Ball.Center, _bgaCurrent.Ball.Center, _bgaCurrent.VoidRate, MeasureCount, "BgaVoid");
                    _bgaCurrent = null;
                    _bgaDrawBall = false;
                    CurrentMeasureMode = Models.MeasureMode.None;
                }
                else
                {
                    _bgaCurrent.Voids.Add(circle);
                    RaiseMeasureStatusChanged($"BGA - 已画 {_bgaCurrent.Voids.Count} 个气泡，继续画气泡或右键切换画焊球");
                }

                // 清除临时点
                if (_bgaPendingDot != null) { _measureOverlay.Children.Remove(_bgaPendingDot); _bgaPendingDot = null; }
                _bgaPendingCenter = null;
            }
        }

        /// <summary>右键切换气泡/焊球模式（在 BGA 测量模式下）</summary>
        private void HandleBgaRightClick()
        {
            if (CurrentMeasureMode != Models.MeasureMode.BgaVoid || _bgaCurrent == null) return;
            _bgaDrawBall = !_bgaDrawBall;
            RaiseMeasureStatusChanged(_bgaDrawBall ? "BGA - 已切换为画焊球模式" : "BGA - 已切换为画气泡模式");
        }

        private Models.BgaCircle CreateBgaCircle(Point center, double radius, bool isBall)
        {
            var c = new Models.BgaCircle { Center = center, Radius = radius, IsBall = isBall };
            c.Shape = new Ellipse
            {
                Stroke = isBall ? Brushes.Lime : Brushes.Orange,
                StrokeThickness = isBall ? 2 : 1.5,
                Fill = Brushes.Transparent,
                IsHitTestVisible = false
            };
            c.CenterDot = CreateMDot(isBall ? Brushes.Lime : Brushes.Orange);
            c.EdgeDot = CreateMDot(isBall ? Brushes.Lime : Brushes.Orange);
            c.EdgeDot.Width = 8; c.EdgeDot.Height = 8;
            c.EdgeDot.Cursor = System.Windows.Input.Cursors.SizeAll;

            _measureOverlay.Children.Add(c.Shape);
            _measureOverlay.Children.Add(c.CenterDot);
            _measureOverlay.Children.Add(c.EdgeDot);
            c.UpdateVisuals();
            return c;
        }

        // BGA Limit 编辑（和 FillRate 类似）
        private void ShowBgaLimitEditor(Models.BgaVoidGroup g)
        {
            if (_measureOverlay == null || g == null) return;
            RemoveTHTEditor();

            double left = Canvas.GetLeft(g.Label);
            double top = Canvas.GetTop(g.Label) + 22;

            _thtEditLabel = new TextBlock
            {
                Text = "VoidLimit(%):",
                FontSize = 11, Foreground = Brushes.White,
                Background = new SolidColorBrush(Color.FromArgb(180, 0, 0, 0)),
                Padding = new Thickness(3, 1, 3, 1)
            };
            Canvas.SetLeft(_thtEditLabel, left);
            Canvas.SetTop(_thtEditLabel, top);
            _measureOverlay.Children.Add(_thtEditLabel);

            _thtEditBox = new TextBox
            {
                Text = g.VoidLimit.ToString("F1"),
                Width = 60, Height = 22, FontSize = 12,
                Background = Brushes.White, BorderBrush = Brushes.Orange, BorderThickness = new Thickness(2),
                Padding = new Thickness(2, 0, 2, 0)
            };
            Canvas.SetLeft(_thtEditBox, left + 85);
            Canvas.SetTop(_thtEditBox, top);
            _measureOverlay.Children.Add(_thtEditBox);
            _thtEditBox.Focus();
            _thtEditBox.SelectAll();

            _thtEditBox.KeyDown += (s, ev) =>
            {
                if (ev.Key == System.Windows.Input.Key.Enter)
                {
                    if (double.TryParse(_thtEditBox.Text, out double val))
                    {
                        g.VoidLimit = System.Math.Clamp(val, 0, 100);
                        g.UpdateLabel();
                        RaiseMeasureCompleted(g.Ball?.Center ?? default, g.Ball?.Center ?? default, g.VoidRate, MeasureCount, "BgaVoid");
                    }
                    RemoveTHTEditor();
                }
                else if (ev.Key == System.Windows.Input.Key.Escape) RemoveTHTEditor();
            };
            _thtEditBox.LostFocus += (s, ev) => RemoveTHTEditor();
        }

        // ── 共用：圆点创建、定位、拖拽、删除 ──

        private Ellipse CreateMDot(Brush fill)
        {
            var dot = new Ellipse { Width = 12, Height = 12, Fill = fill, Stroke = Brushes.White, StrokeThickness = 1.5, Cursor = Cursors.Hand };
            dot.SetValue(ContextMenuService.IsEnabledProperty, false);
            dot.MouseLeftButtonDown += MDot_Down;
            dot.MouseMove += MDot_Move;
            dot.MouseLeftButtonUp += MDot_Up;
            dot.PreviewMouseRightButtonUp += MDot_RightClick;
            return dot;
        }

        private static void SetDotPos(Ellipse dot, Point pos)
        {
            Canvas.SetLeft(dot, pos.X - dot.Width / 2);
            Canvas.SetTop(dot, pos.Y - dot.Height / 2);
        }

        private void MDot_Down(object sender, MouseButtonEventArgs e)
        {
            if (sender is not Ellipse dot) return;
            // 查找点点距组
            foreach (var g in _ppGroups)
            {
                if (g.Dot1 == dot) { _mDraggingOwner = g; _mDraggingRole = "Dot1"; break; }
                if (g.Dot2 == dot) { _mDraggingOwner = g; _mDraggingRole = "Dot2"; break; }
            }
            // 查找点线距组
            if (_mDraggingOwner == null)
            {
                foreach (var g in _ptlGroups)
                {
                    if (g.DotL1 == dot) { _mDraggingOwner = g; _mDraggingRole = "DotL1"; break; }
                    if (g.DotL2 == dot) { _mDraggingOwner = g; _mDraggingRole = "DotL2"; break; }
                    if (g.DotP == dot) { _mDraggingOwner = g; _mDraggingRole = "DotP"; break; }
                }
            }
            // 查找角度组
            if (_mDraggingOwner == null)
            {
                foreach (var g in _angleGroups)
                {
                    if (g.DotV == dot) { _mDraggingOwner = g; _mDraggingRole = "DotV"; break; }
                    if (g.DotA == dot) { _mDraggingOwner = g; _mDraggingRole = "DotA"; break; }
                    if (g.DotB == dot) { _mDraggingOwner = g; _mDraggingRole = "DotB"; break; }
                }
            }
            // 查找填锡率组
            if (_mDraggingOwner == null)
            {
                foreach (var g in _frGroups)
                {
                    if (g.DotE1 == dot) { _mDraggingOwner = g; _mDraggingRole = "E1"; break; }
                    if (g.DotE2 == dot) { _mDraggingOwner = g; _mDraggingRole = "E2"; break; }
                    if (g.DotE3 == dot) { _mDraggingOwner = g; _mDraggingRole = "E3"; break; }
                    if (g.DotE4 == dot) { _mDraggingOwner = g; _mDraggingRole = "E4"; break; }
                    if (g.E1AH == dot) { _mDraggingOwner = g; _mDraggingRole = "E1A"; break; }
                    if (g.E1BH == dot) { _mDraggingOwner = g; _mDraggingRole = "E1B"; break; }
                    if (g.E2AH == dot) { _mDraggingOwner = g; _mDraggingRole = "E2A"; break; }
                    if (g.E2BH == dot) { _mDraggingOwner = g; _mDraggingRole = "E2B"; break; }
                    if (g.E3AH == dot) { _mDraggingOwner = g; _mDraggingRole = "E3A"; break; }
                    if (g.E3BH == dot) { _mDraggingOwner = g; _mDraggingRole = "E3B"; break; }
                    if (g.E4AH == dot) { _mDraggingOwner = g; _mDraggingRole = "E4A"; break; }
                    if (g.E4BH == dot) { _mDraggingOwner = g; _mDraggingRole = "E4B"; break; }
                }
            }
            // 查找 BGA 组
            if (_mDraggingOwner == null)
            {
                foreach (var g in _bgaGroups)
                {
                    if (g.Ball?.CenterDot == dot) { _mDraggingOwner = g; _mDraggingRole = "BallCenter"; break; }
                    if (g.Ball?.EdgeDot == dot) { _mDraggingOwner = g; _mDraggingRole = "BallEdge"; break; }
                    bool found = false;
                    for (int vi = 0; vi < g.Voids.Count; vi++)
                    {
                        if (g.Voids[vi].CenterDot == dot) { _mDraggingOwner = g; _mDraggingRole = $"V{vi}Center"; found = true; break; }
                        if (g.Voids[vi].EdgeDot == dot) { _mDraggingOwner = g; _mDraggingRole = $"V{vi}Edge"; found = true; break; }
                    }
                    if (found) break;
                }
            }
            if (_mDraggingOwner != null) { _mDraggingDot = dot; dot.CaptureMouse(); e.Handled = true; }
        }

        private void MDot_Move(object sender, MouseEventArgs e)
        {
            if (_mDraggingDot == null || _mDraggingOwner == null || _measureOverlay == null) return;
            if (e.LeftButton != MouseButtonState.Pressed) return;
            var pos = e.GetPosition(_measureOverlay);
            SetDotPos(_mDraggingDot, pos);

            if (_mDraggingOwner is Models.MeasureGroup ppg)
            {
                if (_mDraggingRole == "Dot1") ppg.P1 = pos; else ppg.P2 = pos;
                ppg.UpdateLine(); ppg.UpdateLabel(FormatDistance(ppg.Distance));
                RaiseMeasureCompleted(ppg.P1, ppg.P2, ppg.Distance, MeasureCount, "PointDistance");
            }
            else if (_mDraggingOwner is Models.PointToLineGroup ptlg)
            {
                if (_mDraggingRole == "DotL1") ptlg.L1 = pos;
                else if (_mDraggingRole == "DotL2") ptlg.L2 = pos;
                else if (_mDraggingRole == "DotP") ptlg.P = pos;
                ptlg.UpdateVisuals(FormatDistance(ptlg.Distance));
                var foot = ptlg.FootPoint;
                RaiseMeasureCompleted(ptlg.P, foot, ptlg.Distance, MeasureCount, "PointToLine");
            }
            else if (_mDraggingOwner is Models.AngleGroup ag)
            {
                if (_mDraggingRole == "DotV") ag.V = pos;
                else if (_mDraggingRole == "DotA") ag.A = pos;
                else if (_mDraggingRole == "DotB") ag.B = pos;
                ag.UpdateVisuals();
                RaiseMeasureCompleted(ag.V, ag.B, ag.AngleDeg, MeasureCount, "Angle");
            }
            else if (_mDraggingOwner is Models.FillRateGroup frg)
            {
                if (_mDraggingRole == "E1") frg.E1 = pos;
                else if (_mDraggingRole == "E2") frg.E2 = pos;
                else if (_mDraggingRole == "E3") frg.E3 = pos;
                else if (_mDraggingRole == "E4") frg.E4 = pos;
                else if (_mDraggingRole == "E1A") frg.E1A = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E1));
                else if (_mDraggingRole == "E1B") frg.E1B = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E1));
                else if (_mDraggingRole == "E2A") frg.E2A = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E2));
                else if (_mDraggingRole == "E2B") frg.E2B = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E2));
                else if (_mDraggingRole == "E3A") frg.E3A = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E3));
                else if (_mDraggingRole == "E3B") frg.E3B = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E3));
                else if (_mDraggingRole == "E4A") frg.E4A = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E4));
                else if (_mDraggingRole == "E4B") frg.E4B = Math.Max(10, Models.FillRateGroup.Dist(pos, frg.E4));
                frg.UpdateVisuals();
                RaiseMeasureCompleted(frg.E3, frg.E4, frg.FillRate, MeasureCount, "FillRate");
            }
            else if (_mDraggingOwner is Models.BgaVoidGroup bgag)
            {
                if (_mDraggingRole == "BallCenter" && bgag.Ball != null)
                {
                    bgag.Ball.Center = pos; bgag.Ball.UpdateVisuals();
                }
                else if (_mDraggingRole == "BallEdge" && bgag.Ball != null)
                {
                    bgag.Ball.Radius = Math.Max(5, Models.FillRateGroup.Dist(pos, bgag.Ball.Center));
                    bgag.Ball.UpdateVisuals();
                }
                else if (_mDraggingRole.StartsWith("V") && _mDraggingRole.Length > 1)
                {
                    // 解析 V{index}Center 或 V{index}Edge
                    string rest = _mDraggingRole.Substring(1);
                    bool isEdge = rest.EndsWith("Edge");
                    string idxStr = isEdge ? rest.Replace("Edge", "") : rest.Replace("Center", "");
                    if (int.TryParse(idxStr, out int vi) && vi >= 0 && vi < bgag.Voids.Count)
                    {
                        if (isEdge)
                            bgag.Voids[vi].Radius = Math.Max(5, Models.FillRateGroup.Dist(pos, bgag.Voids[vi].Center));
                        else
                            bgag.Voids[vi].Center = pos;
                        bgag.Voids[vi].UpdateVisuals();
                    }
                }
                bgag.UpdateLabel();
                RaiseMeasureCompleted(bgag.Ball?.Center ?? default, bgag.Ball?.Center ?? default, bgag.VoidRate, MeasureCount, "BgaVoid");
            }
            e.Handled = true;
        }

        private void MDot_Up(object sender, MouseButtonEventArgs e)
        {
            if (_mDraggingDot != null) { _mDraggingDot.ReleaseMouseCapture(); _mDraggingDot = null; _mDraggingOwner = null; e.Handled = true; }
        }

        private void MDot_RightClick(object sender, MouseButtonEventArgs e)
        {
            if (sender is not Ellipse dot || _measureOverlay == null) return;

            // 点点距删除
            foreach (var g in _ppGroups)
            {
                if (g.Dot1 == dot || g.Dot2 == dot)
                {
                    foreach (var el in new UIElement[] { g.Dot1, g.Dot2, g.Line, g.Label })
                        _measureOverlay.Children.Remove(el);
                    _ppGroups.Remove(g);
                    RenumberAll();
                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
                    e.Handled = true; return;
                }
            }
            // 点线距删除
            foreach (var g in _ptlGroups)
            {
                if (g.DotL1 == dot || g.DotL2 == dot || g.DotP == dot)
                {
                    foreach (var el in new UIElement[] { g.DotL1, g.DotL2, g.DotP, g.MainLine, g.ExtLine, g.PerpLine, g.FootDot, g.Label })
                        _measureOverlay.Children.Remove(el);
                    _ptlGroups.Remove(g);
                    RenumberAll();
                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
                    e.Handled = true; return;
                }
            }
            // 角度删除
            foreach (var g in _angleGroups)
            {
                if (g.DotV == dot || g.DotA == dot || g.DotB == dot)
                {
                    foreach (var el in new UIElement[] { g.DotV, g.DotA, g.DotB, g.LineA, g.LineB, g.Arc, g.Label })
                        _measureOverlay.Children.Remove(el);
                    _angleGroups.Remove(g);
                    RenumberAll();
                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
                    e.Handled = true; return;
                }
            }
            // 填锡率删除
            foreach (var g in _frGroups)
            {
                bool match = g.DotE1 == dot || g.DotE2 == dot || g.DotE3 == dot || g.DotE4 == dot
                    || g.E1AH == dot || g.E1BH == dot || g.E2AH == dot || g.E2BH == dot
                    || g.E3AH == dot || g.E3BH == dot || g.E4AH == dot || g.E4BH == dot;
                if (match)
                {
                    foreach (var el in g.AllElements)
                        _measureOverlay.Children.Remove(el);
                    _frGroups.Remove(g);
                    RenumberAll();
                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
                    e.Handled = true; return;
                }
            }
            // BGA 删除
            foreach (var g in _bgaGroups)
            {
                bool match = g.Ball?.CenterDot == dot || g.Ball?.EdgeDot == dot;
                if (!match)
                {
                    foreach (var v in g.Voids)
                    {
                        if (v.CenterDot == dot || v.EdgeDot == dot) { match = true; break; }
                    }
                }
                if (match)
                {
                    foreach (var el in g.AllElements)
                        _measureOverlay.Children.Remove(el);
                    _bgaGroups.Remove(g);
                    RenumberAll();
                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
                    e.Handled = true; return;
                }
            }
        }

        // ── 气泡测量辅助 ──

        private void EnsureBubbleRoiVisuals()
        {
            EnsureMeasureOverlay();
            if (_bubbleRoiRect == null)
            {
                _bubbleRoiRect = new Rectangle
                {
                    Stroke = Brushes.Red,
                    StrokeThickness = 1.5,
                    Fill = Brushes.Transparent,
                    Visibility = Visibility.Collapsed,
                    IsHitTestVisible = false
                };
                _measureOverlay.Children.Add(_bubbleRoiRect);
            }
            if (_bubbleRoiHandle == null)
            {
                _bubbleRoiHandle = new Ellipse
                {
                    Width = 10, Height = 10,
                    Fill = Brushes.Red, Stroke = Brushes.White, StrokeThickness = 1,
                    Cursor = Cursors.SizeNWSE,
                    Visibility = Visibility.Collapsed,
                    IsHitTestVisible = false  // 命中测试由 MouseDown 中的距离判断处理
                };
                _measureOverlay.Children.Add(_bubbleRoiHandle);
            }
        }

        private void SyncBubbleRoiVisuals()
        {
            if (_bubbleRoiRect == null || !_bubbleRoi.HasValue) return;
            var r = _bubbleRoi.Value;
            Canvas.SetLeft(_bubbleRoiRect, r.X);
            Canvas.SetTop(_bubbleRoiRect, r.Y);
            _bubbleRoiRect.Width = r.Width;
            _bubbleRoiRect.Height = r.Height;
            _bubbleRoiRect.Visibility = Visibility.Visible;

            if (_bubbleRoiHandle != null)
            {
                Canvas.SetLeft(_bubbleRoiHandle, r.Right - _bubbleRoiHandle.Width / 2);
                Canvas.SetTop(_bubbleRoiHandle, r.Bottom - _bubbleRoiHandle.Height / 2);
                _bubbleRoiHandle.Visibility = Visibility.Visible;
            }
        }

        private void InitBubbleMask()
        {
            if (!_bubbleRoi.HasValue) return;
            int w = (int)CanvasWidth, h = (int)CanvasHeight;
            if (w <= 0 || h <= 0) return;

            _bubbleMask = new System.Windows.Media.Imaging.WriteableBitmap(w, h, 96, 96,
                PixelFormats.Bgra32, null);

            if (_bubbleMaskImage == null)
            {
                EnsureMeasureOverlay();
                _bubbleMaskImage = new Image
                {
                    IsHitTestVisible = false,
                    Opacity = 0.45,
                    Stretch = Stretch.Fill
                };
                _bubbleMaskImage.SetBinding(Image.WidthProperty, new System.Windows.Data.Binding("CanvasWidth") { Source = this });
                _bubbleMaskImage.SetBinding(Image.HeightProperty, new System.Windows.Data.Binding("CanvasHeight") { Source = this });
                _measureOverlay.Children.Add(_bubbleMaskImage);
            }
            _bubbleMaskImage.Source = _bubbleMask;
        }

        private void ApplyBrushAt(Point pos)
        {
            // 画笔/橡皮：下一步实现
        }

        private void UpdateBubbleResult()
        {
            if (_bubbleMask == null || !_bubbleRoi.HasValue) return;
            var roi = _bubbleRoi.Value;
            int w = _bubbleMask.PixelWidth, h = _bubbleMask.PixelHeight;
            int stride = w * 4;
            var pixels = new byte[stride * h];
            _bubbleMask.CopyPixels(pixels, stride, 0);

            int roiX0 = Math.Max(0, (int)roi.X), roiY0 = Math.Max(0, (int)roi.Y);
            int roiX1 = Math.Min(w, (int)roi.Right), roiY1 = Math.Min(h, (int)roi.Bottom);

            int roiArea = 0, voidArea = 0;
            for (int y = roiY0; y < roiY1; y++)
                for (int x = roiX0; x < roiX1; x++)
                {
                    roiArea++;
                    int idx = (y * w + x) * 4;
                    if (pixels[idx + 3] > 0) voidArea++; // alpha > 0 表示已标记
                }

            double voidRate = roiArea > 0 ? voidArea * 100.0 / roiArea : 0;
            RaiseMeasureCompleted(roi.TopLeft, roi.BottomRight, voidRate, 1, "BubbleVoid");
        }

        /// <summary>魔棒：在点击位置做 flood fill</summary>
        public void WandFloodFill(Point pos)
        {
            if (_bubbleMask == null || !_bubbleRoi.HasValue || ImageSource == null) return;

            var roi = _bubbleRoi.Value;
            int px = (int)pos.X, py = (int)pos.Y;
            if (!roi.Contains(pos)) return;

            // 获取灰度像素
            var gray = GetGrayscalePixels();
            if (gray == null) return;

            int w = _bubbleMask.PixelWidth, h = _bubbleMask.PixelHeight;
            if (px < 0 || px >= w || py < 0 || py >= h) return;

            int seedVal = gray[py * w + px];
            int lo = _bubbleThreshold, hi = _bubbleThreshold;

            // BFS flood fill
            var visited = new bool[w * h];
            var queue = new System.Collections.Generic.Queue<(int x, int y)>();
            queue.Enqueue((px, py));
            visited[py * w + px] = true;

            int roiX0 = Math.Max(0, (int)roi.X), roiY0 = Math.Max(0, (int)roi.Y);
            int roiX1 = Math.Min(w, (int)roi.Right), roiY1 = Math.Min(h, (int)roi.Bottom);

            var filled = new System.Collections.Generic.List<(int x, int y)>();

            while (queue.Count > 0)
            {
                var (cx, cy) = queue.Dequeue();
                int val = gray[cy * w + cx];

                // 阈值判断：与种子点灰度差在阈值范围内
                if (Math.Abs(val - seedVal) > lo) continue;
                // 必须在 ROI 内
                if (cx < roiX0 || cx >= roiX1 || cy < roiY0 || cy >= roiY1) continue;

                filled.Add((cx, cy));

                // 四邻域
                int[] dx = { -1, 1, 0, 0 }, dy = { 0, 0, -1, 1 };
                for (int d = 0; d < 4; d++)
                {
                    int nx = cx + dx[d], ny = cy + dy[d];
                    if (nx >= roiX0 && nx < roiX1 && ny >= roiY0 && ny < roiY1 && !visited[ny * w + nx])
                    {
                        visited[ny * w + nx] = true;
                        queue.Enqueue((nx, ny));
                    }
                }
            }

            if (filled.Count == 0) return;

            // 写入 mask（橙色半透明）
            int stride = w * 4;
            var maskPixels = new byte[stride * h];
            _bubbleMask.CopyPixels(maskPixels, stride, 0);

            foreach (var (fx, fy) in filled)
            {
                int idx = (fy * w + fx) * 4;
                maskPixels[idx + 0] = 0;     // B
                maskPixels[idx + 1] = 140;   // G
                maskPixels[idx + 2] = 255;   // R (橙色)
                maskPixels[idx + 3] = 180;   // A
            }

            _bubbleMask.WritePixels(new System.Windows.Int32Rect(0, 0, w, h), maskPixels, stride, 0);
            UpdateBubbleResult();
        }

        /// <summary>从 ImageSource 提取灰度像素数组</summary>
        private byte[] GetGrayscalePixels()
        {
            if (ImageSource is not BitmapSource bmp) return null;

            int w = bmp.PixelWidth, h = bmp.PixelHeight;
            if (w != (int)CanvasWidth || h != (int)CanvasHeight) return null;

            // 转为 Bgra32
            var converted = new FormatConvertedBitmap(bmp, PixelFormats.Bgra32, null, 0);
            int stride = w * 4;
            var pixels = new byte[stride * h];
            converted.CopyPixels(pixels, stride, 0);

            // 提取灰度
            var gray = new byte[w * h];
            for (int i = 0; i < w * h; i++)
            {
                int idx = i * 4;
                gray[i] = (byte)(pixels[idx + 2] * 0.299 + pixels[idx + 1] * 0.587 + pixels[idx] * 0.114);
            }
            return gray;
        }

        /// <summary>清除气泡测量所有状态</summary>
        public void ClearBubbleMeasure()
        {
            if (_measureOverlay != null)
            {
                if (_bubbleRoiRect != null) { _measureOverlay.Children.Remove(_bubbleRoiRect); _bubbleRoiRect = null; }
                if (_bubbleRoiHandle != null) { _measureOverlay.Children.Remove(_bubbleRoiHandle); _bubbleRoiHandle = null; }
                if (_bubbleMaskImage != null) { _measureOverlay.Children.Remove(_bubbleMaskImage); _bubbleMaskImage = null; }
            }
            _bubbleRoi = null;
            _bubbleMask = null;
            _bubbleRoiStart = null;
            _bubbleRoiDragging = false;
            _bubbleRoiMoving = false;
            _bubbleRoiResizing = false;
            _bubbleBrushDragging = false;
            _bubbleTool = BubbleSubTool.Roi;
        }

        // 气泡工具切换事件
        public static readonly RoutedEvent BubbleToolChangedEvent =
            EventManager.RegisterRoutedEvent(nameof(BubbleToolChanged), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(PolygonRoiCanvas));

        public event RoutedEventHandler BubbleToolChanged
        {
            add { AddHandler(BubbleToolChangedEvent, value); }
            remove { RemoveHandler(BubbleToolChangedEvent, value); }
        }

        private void RaiseBubbleToolChanged()
        {
            RaiseEvent(new RoutedEventArgs(BubbleToolChangedEvent));
        }

        // ── 重编号 ──

        private void RenumberAll()
        {
            for (int i = 0; i < _ppGroups.Count; i++)
            {
                _ppGroups[i].Index = i + 1;
                _ppGroups[i].UpdateLine();
                _ppGroups[i].UpdateLabel(FormatDistance(_ppGroups[i].Distance));
            }
            for (int i = 0; i < _ptlGroups.Count; i++)
            {
                _ptlGroups[i].Index = i + 1;
                _ptlGroups[i].UpdateVisuals(FormatDistance(_ptlGroups[i].Distance));
            }
            for (int i = 0; i < _angleGroups.Count; i++)
            {
                _angleGroups[i].Index = i + 1;
                _angleGroups[i].UpdateVisuals();
            }
            for (int i = 0; i < _frGroups.Count; i++)
            {
                _frGroups[i].Index = i + 1;
                _frGroups[i].UpdateVisuals();
            }
            for (int i = 0; i < _bgaGroups.Count; i++)
            {
                _bgaGroups[i].Index = i + 1;
                _bgaGroups[i].UpdateLabel();
            }
        }

        // ── 填锡率阈值编辑 ──

        private TextBox _thtEditBox;
        private TextBlock _thtEditLabel;

        private void RemoveTHTEditor()
        {
            if (_thtEditBox != null && _measureOverlay != null)
                _measureOverlay.Children.Remove(_thtEditBox);
            if (_thtEditLabel != null && _measureOverlay != null)
                _measureOverlay.Children.Remove(_thtEditLabel);
            _thtEditBox = null;
            _thtEditLabel = null;
        }

        private void ShowTHTLimitEditor(Models.FillRateGroup g)
        {
            if (_measureOverlay == null) return;

            // 移除旧的编辑框
            if (_thtEditBox != null)
            {
                _measureOverlay.Children.Remove(_thtEditBox);
                _thtEditBox = null;
            }
            if (_thtEditLabel != null)
            {
                _measureOverlay.Children.Remove(_thtEditLabel);
                _thtEditLabel = null;
            }

            double left = Canvas.GetLeft(g.Label);
            double top = Canvas.GetTop(g.Label) + 22;

            // 参数名称提示
            _thtEditLabel = new TextBlock
            {
                Text = "THTLimit(%):",
                FontSize = 11,
                Foreground = Brushes.White,
                Background = new SolidColorBrush(Color.FromArgb(180, 0, 0, 0)),
                Padding = new Thickness(3, 1, 3, 1)
            };
            Canvas.SetLeft(_thtEditLabel, left);
            Canvas.SetTop(_thtEditLabel, top);
            _measureOverlay.Children.Add(_thtEditLabel);

            // 输入框
            _thtEditBox = new TextBox
            {
                Text = g.THTLimit.ToString("F1"),
                Width = 60,
                Height = 22,
                FontSize = 12,
                Background = Brushes.White,
                BorderBrush = Brushes.Orange,
                BorderThickness = new Thickness(2),
                Padding = new Thickness(2, 0, 2, 0)
            };
            Canvas.SetLeft(_thtEditBox, left + 80);
            Canvas.SetTop(_thtEditBox, top);
            _measureOverlay.Children.Add(_thtEditBox);
            _thtEditBox.Focus();
            _thtEditBox.SelectAll();

            // 回车确认
            _thtEditBox.KeyDown += (s, ev) =>
            {
                if (ev.Key == System.Windows.Input.Key.Enter)
                {
                    if (double.TryParse(_thtEditBox.Text, out double val))
                    {
                        g.THTLimit = System.Math.Clamp(val, 0, 100);
                        g.UpdateVisuals();
                        RaiseMeasureCompleted(g.E3, g.E4, g.FillRate, MeasureCount, "FillRate");
                    }
                    RemoveTHTEditor();
                }
                else if (ev.Key == System.Windows.Input.Key.Escape)
                {
                    RemoveTHTEditor();
                }
            };

            // 失焦也关闭
            _thtEditBox.LostFocus += (s, ev) => RemoveTHTEditor();
        }

        // ── 事件 ──

        public static readonly RoutedEvent MeasureCompletedEvent =
            EventManager.RegisterRoutedEvent(nameof(MeasureCompleted), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(PolygonRoiCanvas));

        public event RoutedEventHandler MeasureCompleted
        {
            add { AddHandler(MeasureCompletedEvent, value); }
            remove { RemoveHandler(MeasureCompletedEvent, value); }
        }

        private void RaiseMeasureCompleted(Point p1, Point p2, double distance, int totalCount, string measureType)
        {
            RaiseEvent(new MeasureCompletedEventArgs(MeasureCompletedEvent, p1, p2, distance, totalCount) { MeasureType = measureType });
        }

        public static readonly RoutedEvent MeasureStatusChangedEvent =
            EventManager.RegisterRoutedEvent(nameof(MeasureStatusChanged), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(PolygonRoiCanvas));

        public event RoutedEventHandler MeasureStatusChanged
        {
            add { AddHandler(MeasureStatusChangedEvent, value); }
            remove { RemoveHandler(MeasureStatusChangedEvent, value); }
        }

        private void RaiseMeasureStatusChanged(string message)
        {
            RaiseEvent(new MeasureStatusEventArgs(MeasureStatusChangedEvent, message));
        }

        #endregion Measurement

        #region Adorner Management

        private void UpdateAdorner()
        {
            // 移除旧的Adorner
            if (currentAdorner != null)
            {
                var adornerLayer = AdornerLayer.GetAdornerLayer(mainCanvas);
                if (adornerLayer != null)
                {
                    adornerLayer.Remove(currentAdorner);
                }
                currentAdorner = null;
            }

            // 为选中的ROI添加Adorner
            if (SelectedROI != null && SelectedROI.IsSelected)
            {
                // 查找对应的UI元素
                var container = FindROIVisual(SelectedROI);
                if (container != null)
                {
                    var adornerLayer = AdornerLayer.GetAdornerLayer(mainCanvas);
                    if (adornerLayer != null)
                    {
                        double scaleFactor = 1.0 / ZoomScale;

                        if (SelectedROI is PolygonROI polygonROI)
                        {
                            currentAdorner = new PolygonAdorner(container, scaleFactor, polygonROI);
                        }

                        if (currentAdorner != null)
                        {
                            adornerLayer.Add(currentAdorner);
                        }
                    }
                }
            }
        }

        private UIElement? FindROIVisual(ROIShape roi)
        {
            // 在ItemsControl中查找对应的视觉元素
            var itemsControl = FindVisualChild<ItemsControl>(mainCanvas);
            if (itemsControl != null)
            {
                for (int i = 0; i < itemsControl.Items.Count; i++)
                {
                    if (itemsControl.Items[i] == roi)
                    {
                        // 尝试获取容器
                        var container = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as ContentPresenter;

                        // 如果容器还没生成，尝试强制生成
                        if (container == null)
                        {
                            // 强制生成容器
                            itemsControl.UpdateLayout();
                            container = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as ContentPresenter;
                        }

                        if (container != null)
                        {
                            // 查找实际的形状元素（只支持多边形）
                            if (roi is PolygonROI)
                            {
                                return FindVisualChild<Polygon>(container);
                            }
                        }
                    }
                }
            }
            return null;
        }

        private T? FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                if (child is T result)
                {
                    return result;
                }
                var childOfChild = FindVisualChild<T>(child);
                if (childOfChild != null)
                {
                    return childOfChild;
                }
            }
            return null;
        }

        #endregion Adorner Management

        #region Mouse Events

        private void Canvas_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            double oldZoom = ZoomScale;
            double newZoom = e.Delta > 0 ? oldZoom * ZoomStep : oldZoom / ZoomStep;
            newZoom = Math.Max(0.1, Math.Min(10.0, newZoom));

            if (Math.Abs(newZoom - oldZoom) > 0.001)
            {
                ZoomScale = newZoom;
                // RenderTransformOrigin="0.5,0.5" 保证以图像中心等比缩放
                // 拖拽平移偏移保持不变
            }

            e.Handled = true;
        }

        private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // 气泡测量模式：ROI 拖拽 / 画笔涂抹
            if (CurrentMeasureMode == Models.MeasureMode.BubbleMeasure)
            {
                var pos = e.GetPosition(mainCanvas);
                if (_bubbleTool == BubbleSubTool.Roi)
                {
                    // 检查是否点击了右下角手柄
                    if (_bubbleRoiHandle != null && _bubbleRoi.HasValue)
                    {
                        var hx = Canvas.GetLeft(_bubbleRoiHandle) + _bubbleRoiHandle.Width / 2;
                        var hy = Canvas.GetTop(_bubbleRoiHandle) + _bubbleRoiHandle.Height / 2;
                        if (Math.Abs(pos.X - hx) < 10 && Math.Abs(pos.Y - hy) < 10)
                        {
                            _bubbleRoiResizing = true;
                            mainCanvas.CaptureMouse();
                            e.Handled = true;
                            return;
                        }
                    }
                    // 检查是否点击了 ROI 内部（拖动）
                    if (_bubbleRoi.HasValue && _bubbleRoi.Value.Contains(pos))
                    {
                        _bubbleRoiMoving = true;
                        _bubbleRoiDragOffset = new Point(pos.X - _bubbleRoi.Value.X, pos.Y - _bubbleRoi.Value.Y);
                        mainCanvas.CaptureMouse();
                        e.Handled = true;
                        return;
                    }
                    // 没有 ROI 时才画新的，有 ROI 时点击外部不拦截（让图像正常拖动）
                    if (!_bubbleRoi.HasValue)
                    {
                        _bubbleRoiStart = pos;
                        _bubbleRoiDragging = true;
                        EnsureBubbleRoiVisuals();
                        mainCanvas.CaptureMouse();
                        e.Handled = true;
                        return;
                    }
                    // 有 ROI 但点击了外部 → 不拦截，走正常拖动逻辑
                }
                if ((_bubbleTool == BubbleSubTool.Brush || _bubbleTool == BubbleSubTool.Eraser) && _bubbleRoi.HasValue)
                {
                    _bubbleBrushDragging = true;
                    ApplyBrushAt(pos);
                    mainCanvas.CaptureMouse();
                    e.Handled = true;
                    return;
                }
                // 魔棒在 MouseUp（CanvasClicked）中处理
            }

            lastMousePosition = e.GetPosition(imageDisplayGrid);
            isDragging = false;
            mainCanvas.CaptureMouse();
        }

        private void Canvas_MouseMove(object sender, MouseEventArgs e)
        {
            // 气泡测量：ROI 拖拽画新矩形
            if (_bubbleRoiDragging && _bubbleRoiStart.HasValue && _bubbleRoiRect != null)
            {
                var pos = e.GetPosition(mainCanvas);
                double x = Math.Min(_bubbleRoiStart.Value.X, pos.X);
                double y = Math.Min(_bubbleRoiStart.Value.Y, pos.Y);
                double w = Math.Abs(pos.X - _bubbleRoiStart.Value.X);
                double h = Math.Abs(pos.Y - _bubbleRoiStart.Value.Y);
                Canvas.SetLeft(_bubbleRoiRect, x);
                Canvas.SetTop(_bubbleRoiRect, y);
                _bubbleRoiRect.Width = w;
                _bubbleRoiRect.Height = h;
                _bubbleRoiRect.Visibility = Visibility.Visible;
                if (_bubbleRoiHandle != null) _bubbleRoiHandle.Visibility = Visibility.Collapsed;
                e.Handled = true;
                return;
            }
            // 气泡测量：拖动 ROI
            if (_bubbleRoiMoving && _bubbleRoi.HasValue)
            {
                var pos = e.GetPosition(mainCanvas);
                double nx = pos.X - _bubbleRoiDragOffset.X;
                double ny = pos.Y - _bubbleRoiDragOffset.Y;
                _bubbleRoi = new Rect(nx, ny, _bubbleRoi.Value.Width, _bubbleRoi.Value.Height);
                SyncBubbleRoiVisuals();
                e.Handled = true;
                return;
            }
            // 气泡测量：右下角调整大小
            if (_bubbleRoiResizing && _bubbleRoi.HasValue)
            {
                var pos = e.GetPosition(mainCanvas);
                double w = Math.Max(20, pos.X - _bubbleRoi.Value.X);
                double h = Math.Max(20, pos.Y - _bubbleRoi.Value.Y);
                _bubbleRoi = new Rect(_bubbleRoi.Value.X, _bubbleRoi.Value.Y, w, h);
                SyncBubbleRoiVisuals();
                e.Handled = true;
                return;
            }
            // 气泡测量：画笔/橡皮拖拽
            if (_bubbleBrushDragging && _bubbleRoi.HasValue)
            {
                var pos = e.GetPosition(mainCanvas);
                ApplyBrushAt(pos);
                e.Handled = true;
                return;
            }

            if (e.LeftButton == MouseButtonState.Pressed && mainCanvas.IsMouseCaptured)
            {
                Point currentPosition = e.GetPosition(imageDisplayGrid);
                Vector delta = currentPosition - lastMousePosition;

                if (delta.Length > 5)
                {
                    isDragging = true;
                    PanOffsetX += delta.X;
                    PanOffsetY += delta.Y;
                    lastMousePosition = currentPosition;
                }
            }
        }

        private void Canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            // 气泡测量：ROI 拖拽完成
            if (_bubbleRoiDragging && _bubbleRoiStart.HasValue)
            {
                var pos = e.GetPosition(mainCanvas);
                double x = Math.Min(_bubbleRoiStart.Value.X, pos.X);
                double y = Math.Min(_bubbleRoiStart.Value.Y, pos.Y);
                double w = Math.Abs(pos.X - _bubbleRoiStart.Value.X);
                double h = Math.Abs(pos.Y - _bubbleRoiStart.Value.Y);
                _bubbleRoiDragging = false;
                _bubbleRoiStart = null;
                mainCanvas.ReleaseMouseCapture();

                if (w > 5 && h > 5)
                {
                    _bubbleRoi = new Rect(x, y, w, h);
                    SyncBubbleRoiVisuals();
                    InitBubbleMask();
                    RaiseMeasureStatusChanged($"ROI 已设置: {w:F0}×{h:F0}，可拖动/调整大小，或在面板切换魔棒工具");
                }
                e.Handled = true;
                return;
            }
            // 气泡测量：拖动/调整完成
            if (_bubbleRoiMoving || _bubbleRoiResizing)
            {
                _bubbleRoiMoving = false;
                _bubbleRoiResizing = false;
                mainCanvas.ReleaseMouseCapture();
                if (_bubbleRoi.HasValue)
                    RaiseMeasureStatusChanged($"ROI: {_bubbleRoi.Value.Width:F0}×{_bubbleRoi.Value.Height:F0}");
                e.Handled = true;
                return;
            }
            // 气泡测量：画笔/橡皮松开
            if (_bubbleBrushDragging)
            {
                _bubbleBrushDragging = false;
                mainCanvas.ReleaseMouseCapture();
                UpdateBubbleResult();
                e.Handled = true;
                return;
            }

            mainCanvas.ReleaseMouseCapture();

            if (!isDragging)
            {
                Point clickPosition = e.GetPosition(mainCanvas);
                if (IsMeasuring)
                {
                    HandleMeasureClick(clickPosition);
                    // 魔棒点击
                    if (CurrentMeasureMode == Models.MeasureMode.BubbleMeasure && _bubbleTool == BubbleSubTool.Wand && _bubbleRoi.HasValue)
                    {
                        WandFloodFill(clickPosition);
                    }
                }
                OnCanvasClicked(clickPosition);
            }

            isDragging = false;
        }

        private void Canvas_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            // BGA 模式下右键切换气泡/焊球
            if (CurrentMeasureMode == Models.MeasureMode.BgaVoid && _bgaCurrent != null)
            {
                HandleBgaRightClick();
                e.Handled = true;
                return;
            }
            // 右键点击完成多边形
            OnRightClick();
            // 不设 e.Handled，让 ContextMenu 正常弹出
        }

        private void Canvas_PreviewMouseRightButtonUp(object sender, MouseButtonEventArgs e)
        {
            // BGA 模式下阻止 ContextMenu 弹出
            if (CurrentMeasureMode == Models.MeasureMode.BgaVoid && _bgaCurrent != null)
            {
                e.Handled = true;
            }
        }

        private void ROI_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // 选择ROI
            if (sender is FrameworkElement element && element.DataContext is ROIShape roi)
            {
                SelectedROI = roi;
                e.Handled = true;
            }
        }

        #endregion Mouse Events

        #region Public Methods

        public void ResetView()
        {
            PanOffsetX = 0;
            PanOffsetY = 0;

            if (imageDisplayGrid == null || CanvasWidth <= 0 || CanvasHeight <= 0)
            {
                ZoomScale = 1.0;
                return;
            }

            // 延迟到布局完成后计算，确保 ActualWidth/Height 准确
            Dispatcher.BeginInvoke(new Action(() =>
            {
                double viewW = imageDisplayGrid.ActualWidth;
                double viewH = imageDisplayGrid.ActualHeight;

                if (viewW > 0 && viewH > 0)
                {
                    ZoomScale = Math.Min(viewW / CanvasWidth, viewH / CanvasHeight);
                }
                else
                {
                    ZoomScale = 1.0;
                }

                PanOffsetX = 0;
                PanOffsetY = 0;
            }), System.Windows.Threading.DispatcherPriority.Render);
        }

        private void BtnZoomIn_Click(object sender, RoutedEventArgs e)
        {
            double newZoom = ZoomScale * 1.2;
            if (newZoom <= 10.0)
            {
                ZoomScale = newZoom;
                PanOffsetX = 0;
                PanOffsetY = 0;
            }
        }

        private void BtnZoomOut_Click(object sender, RoutedEventArgs e)
        {
            double newZoom = ZoomScale / 1.2;
            if (newZoom >= 0.1)
            {
                ZoomScale = newZoom;
                PanOffsetX = 0;
                PanOffsetY = 0;
            }
        }

        private void BtnReset_Click(object sender, RoutedEventArgs e)
        {
            ResetView();
        }

        #endregion Public Methods

        #region Events

        public static readonly RoutedEvent CanvasClickedEvent =
            EventManager.RegisterRoutedEvent(nameof(CanvasClicked), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(PolygonRoiCanvas));

        public event RoutedEventHandler CanvasClicked
        {
            add { AddHandler(CanvasClickedEvent, value); }
            remove { RemoveHandler(CanvasClickedEvent, value); }
        }

        protected virtual void OnCanvasClicked(Point position)
        {
            var args = new CanvasClickedEventArgs(CanvasClickedEvent, position);
            RaiseEvent(args);
        }

        public static readonly RoutedEvent RightClickEvent =
            EventManager.RegisterRoutedEvent(nameof(RightClick), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(PolygonRoiCanvas));

        public event RoutedEventHandler RightClick
        {
            add { AddHandler(RightClickEvent, value); }
            remove { RemoveHandler(RightClickEvent, value); }
        }

        protected virtual void OnRightClick()
        {
            RaiseEvent(new RoutedEventArgs(RightClickEvent));
        }

        #endregion Events
    }
}