XplorePlane/XP.ImageProcessing.RoiControl/Models/MeasureGroup.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace XP.ImageProcessing.RoiControl.Models
{
    /// <summary>一次点点距测量的所有视觉元素</summary>
    public class MeasureGroup
    {
        public Ellipse Dot1 { get; set; }
        public Ellipse Dot2 { get; set; }
        public Line Line { get; set; }
        public TextBlock Label { get; set; }
        public Point P1 { get; set; }
        public Point P2 { get; set; }

        public double Distance
        {
            get
            {
                double dx = P2.X - P1.X, dy = P2.Y - P1.Y;
                return Math.Sqrt(dx * dx + dy * dy);
            }
        }

        public void UpdateLine()
        {
            Line.X1 = P1.X; Line.Y1 = P1.Y;
            Line.X2 = P2.X; Line.Y2 = P2.Y;
            Line.Visibility = Visibility.Visible;
        }

        public void UpdateLabel(string distanceText = null)
        {
            Label.Text = distanceText ?? $"{Distance:F2} px";
            Canvas.SetLeft(Label, (P1.X + P2.X) / 2 + 8);
            Canvas.SetTop(Label, (P1.Y + P2.Y) / 2 - 18);
            Label.Visibility = Visibility.Visible;
        }
    }
}