点点距测量工具初步实现
This commit is contained in:
李伟
@@ -1,12 +1,324 @@
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using XP.ImageProcessing.RoiControl.Controls;
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using XplorePlane.Events;
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using XplorePlane.ViewModels;
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namespace XplorePlane.Views
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{
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/// <summary>一次测量的所有视觉元素</summary>
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internal class MeasureGroup
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{
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public Ellipse Dot1, Dot2;
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public Line Line;
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public TextBlock Label;
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public Point P1, P2;
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public void UpdateLine()
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{
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Line.X1 = P1.X; Line.Y1 = P1.Y;
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Line.X2 = P2.X; Line.Y2 = P2.Y;
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Line.Visibility = Visibility.Visible;
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}
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public void UpdateLabel()
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{
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double dx = P2.X - P1.X, dy = P2.Y - P1.Y;
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double dist = Math.Sqrt(dx * dx + dy * dy);
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Label.Text = $"{dist:F2} px";
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Canvas.SetLeft(Label, (P1.X + P2.X) / 2 + 8);
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Canvas.SetTop(Label, (P1.Y + P2.Y) / 2 - 18);
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Label.Visibility = Visibility.Visible;
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}
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}
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public partial class ViewportPanelView : UserControl
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{
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private Canvas _measureOverlay;
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private readonly List<MeasureGroup> _groups = new();
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// 当前正在创建的测量（只有第一个点，还没完成）
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private Ellipse _pendingDot;
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private Point? _pendingPoint;
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// 拖拽状态
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private Ellipse _draggingDot;
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private MeasureGroup _draggingGroup;
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private bool _draggingIsDot1;
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public ViewportPanelView()
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{
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InitializeComponent();
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DataContextChanged += OnDataContextChanged;
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RoiCanvas.CanvasClicked += (s, e) =>
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{
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if (e is CanvasClickedEventArgs args)
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OnCanvasClicked(args.Position);
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};
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}
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private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue is INotifyPropertyChanged oldVm)
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oldVm.PropertyChanged -= OnVmPropertyChanged;
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if (e.NewValue is INotifyPropertyChanged newVm)
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newVm.PropertyChanged += OnVmPropertyChanged;
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}
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private void OnVmPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (sender is not ViewportPanelViewModel vm) return;
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if (e.PropertyName == nameof(ViewportPanelViewModel.CurrentMeasurementMode))
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{
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if (vm.CurrentMeasurementMode != MeasurementToolMode.None)
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Dispatcher.BeginInvoke(new Action(EnsureOverlay),
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System.Windows.Threading.DispatcherPriority.Loaded);
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else
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RemoveOverlay();
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}
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}
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#region 覆盖层管理
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private void EnsureOverlay()
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{
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if (_measureOverlay != null) return;
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var mainCanvas = FindChildByName<Canvas>(RoiCanvas, "mainCanvas");
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if (mainCanvas == null) return;
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_measureOverlay = new Canvas
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{
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IsHitTestVisible = true,
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Background = Brushes.Transparent
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};
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_measureOverlay.SetBinding(Canvas.WidthProperty,
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new System.Windows.Data.Binding("CanvasWidth") { Source = RoiCanvas });
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_measureOverlay.SetBinding(Canvas.HeightProperty,
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new System.Windows.Data.Binding("CanvasHeight") { Source = RoiCanvas });
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mainCanvas.Children.Add(_measureOverlay);
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}
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private void RemoveOverlay()
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{
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if (_measureOverlay != null)
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{
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(VisualTreeHelper.GetParent(_measureOverlay) as Canvas)?.Children.Remove(_measureOverlay);
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_measureOverlay = null;
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}
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_groups.Clear();
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_pendingDot = null;
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_pendingPoint = null;
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_draggingDot = null;
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_draggingGroup = null;
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}
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#endregion
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#region 点击处理
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private void OnCanvasClicked(Point pos)
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{
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if (DataContext is not ViewportPanelViewModel vm || !vm.IsMeasuring) return;
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if (vm.CurrentMeasurementMode != MeasurementToolMode.PointDistance) return;
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if (_measureOverlay == null) EnsureOverlay();
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if (_measureOverlay == null) return;
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if (!_pendingPoint.HasValue)
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{
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// 第一个点
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_pendingPoint = pos;
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_pendingDot = CreateDot(Brushes.Red);
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_measureOverlay.Children.Add(_pendingDot);
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SetDotPos(_pendingDot, pos);
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vm.ImageInfo = $"点点距测量 - 第一点: ({pos.X:F0}, {pos.Y:F0})，请点击第二个点";
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}
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else
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{
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// 第二个点 → 完成一次测量
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var group = CreateGroup(_pendingPoint.Value, pos);
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_groups.Add(group);
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// 移除临时的第一个点（已被 group.Dot1 替代）
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_measureOverlay.Children.Remove(_pendingDot);
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_pendingDot = null;
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_pendingPoint = null;
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UpdateStatusBar(vm, group);
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}
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}
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#endregion
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#region 测量组创建
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private MeasureGroup CreateGroup(Point p1, Point p2)
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{
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var g = new MeasureGroup { P1 = p1, P2 = p2 };
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g.Line = new Line
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{
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Stroke = Brushes.Lime,
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StrokeThickness = 2,
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IsHitTestVisible = false
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};
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_measureOverlay.Children.Add(g.Line);
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g.Label = new TextBlock
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{
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Foreground = Brushes.Yellow,
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FontSize = 13,
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FontWeight = FontWeights.Bold,
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IsHitTestVisible = false
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};
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_measureOverlay.Children.Add(g.Label);
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g.Dot1 = CreateDot(Brushes.Red);
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g.Dot2 = CreateDot(Brushes.Blue);
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_measureOverlay.Children.Add(g.Dot1);
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_measureOverlay.Children.Add(g.Dot2);
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SetDotPos(g.Dot1, p1);
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SetDotPos(g.Dot2, p2);
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g.UpdateLine();
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g.UpdateLabel();
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return g;
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}
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private Ellipse CreateDot(Brush fill)
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{
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var dot = new Ellipse
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{
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Width = 12, Height = 12,
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Fill = fill,
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Stroke = Brushes.White,
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StrokeThickness = 1.5,
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Cursor = Cursors.Hand
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};
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dot.MouseLeftButtonDown += Dot_Down;
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dot.MouseMove += Dot_Move;
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dot.MouseLeftButtonUp += Dot_Up;
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dot.MouseRightButtonDown += Dot_RightClick;
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return dot;
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}
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#endregion
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#region 拖拽
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private void Dot_Down(object sender, MouseButtonEventArgs e)
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{
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if (sender is not Ellipse dot) return;
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// 找到这个圆点属于哪个测量组
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foreach (var g in _groups)
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{
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if (g.Dot1 == dot) { _draggingGroup = g; _draggingIsDot1 = true; break; }
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if (g.Dot2 == dot) { _draggingGroup = g; _draggingIsDot1 = false; break; }
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}
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if (_draggingGroup != null)
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{
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_draggingDot = dot;
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dot.CaptureMouse();
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e.Handled = true;
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}
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}
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private void Dot_Move(object sender, MouseEventArgs e)
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{
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if (_draggingDot == null || _draggingGroup == null || _measureOverlay == null) return;
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if (e.LeftButton != MouseButtonState.Pressed) return;
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var pos = e.GetPosition(_measureOverlay);
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SetDotPos(_draggingDot, pos);
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if (_draggingIsDot1) _draggingGroup.P1 = pos;
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else _draggingGroup.P2 = pos;
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_draggingGroup.UpdateLine();
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_draggingGroup.UpdateLabel();
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if (DataContext is ViewportPanelViewModel vm)
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UpdateStatusBar(vm, _draggingGroup);
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e.Handled = true;
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}
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private void Dot_Up(object sender, MouseButtonEventArgs e)
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{
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if (_draggingDot != null)
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{
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_draggingDot.ReleaseMouseCapture();
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_draggingDot = null;
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_draggingGroup = null;
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e.Handled = true;
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}
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}
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private void Dot_RightClick(object sender, MouseButtonEventArgs e)
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{
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if (sender is not Ellipse dot || _measureOverlay == null) return;
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MeasureGroup target = null;
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foreach (var g in _groups)
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{
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if (g.Dot1 == dot || g.Dot2 == dot) { target = g; break; }
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}
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if (target == null) return;
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// 移除该组的所有视觉元素
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_measureOverlay.Children.Remove(target.Dot1);
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_measureOverlay.Children.Remove(target.Dot2);
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_measureOverlay.Children.Remove(target.Line);
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_measureOverlay.Children.Remove(target.Label);
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_groups.Remove(target);
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if (DataContext is ViewportPanelViewModel vm)
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vm.ImageInfo = $"已删除测量线 | 剩余 {_groups.Count} 条";
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e.Handled = true;
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}
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#endregion
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#region 辅助
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private static void SetDotPos(Ellipse dot, Point pos)
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{
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Canvas.SetLeft(dot, pos.X - dot.Width / 2);
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Canvas.SetTop(dot, pos.Y - dot.Height / 2);
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}
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private void UpdateStatusBar(ViewportPanelViewModel vm, MeasureGroup g)
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{
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double dx = g.P2.X - g.P1.X, dy = g.P2.Y - g.P1.Y;
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double dist = Math.Sqrt(dx * dx + dy * dy);
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vm.MeasurementResult = $"{dist:F2} px";
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vm.ImageInfo = $"点点距: {dist:F2} px | ({g.P1.X:F0},{g.P1.Y:F0}) → ({g.P2.X:F0},{g.P2.Y:F0}) | 共 {_groups.Count} 条测量";
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}
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private static T FindChildByName<T>(DependencyObject parent, string name) where T : FrameworkElement
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{
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int count = VisualTreeHelper.GetChildrenCount(parent);
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for (int i = 0; i < count; i++)
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{
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var child = VisualTreeHelper.GetChild(parent, i);
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if (child is T t && t.Name == name) return t;
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var result = FindChildByName<T>(child, name);
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if (result != null) return result;
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}
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return null;
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}
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#endregion
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}
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}
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}
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