MainWindow.xaml.cs

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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace WpfZoom
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 半透明矩形框移动
        /// </summary>        
        private void MoveRect_MouseMove(object sender, MouseEventArgs e)
        {
            FrameworkElement element = sender as FrameworkElement;

            //计算鼠标在X轴的移动距离
            double deltaV = e.GetPosition(MoveRect).Y - MoveRect.Height / 2;
            //计算鼠标在Y轴的移动距离
            double deltaH = e.GetPosition(MoveRect).X - MoveRect.Width / 2; ;
            //得到图片Top新位置
            double newTop = deltaV + (double)MoveRect.GetValue(Canvas.TopProperty);
            //得到图片Left新位置
            double newLeft = deltaH + (double)MoveRect.GetValue(Canvas.LeftProperty);

            //边界的判断
            if (newLeft <= 0)
            {
                newLeft = 0;
            }

            //左侧图片框宽度 - 半透明矩形框宽度
            if (newLeft >= (this.SmallBox.Width - this.MoveRect.Width))
            {
                newLeft = this.SmallBox.Width - this.MoveRect.Width;
            }

            if (newTop <= 0)
            {
                newTop = 0;
            }

            //左侧图片框高度度 - 半透明矩形框高度度
            if (newTop >= this.SmallBox.Height - this.MoveRect.Height)
            {
                newTop = this.SmallBox.Height - this.MoveRect.Height;
            }
            MoveRect.SetValue(Canvas.TopProperty, newTop);
            MoveRect.SetValue(Canvas.LeftProperty, newLeft);
            #region
            //获取右侧大图框与透明矩形框的尺寸比率
            double n = this.BigBox.Width / this.MoveRect.Width;