c# wpf 实现放大镜

using System;using System.Collections.Generic;using System.ComponentModel;using System.Diagnostics;using System.Drawing;using System.IO;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Forms;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace Magnifying{ /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { private System.Drawing.Rectangle rc = Screen.PrimaryScreen.Bounds; private NotifyIcon MyNotifyIcon = null; private ExitWindow exitWindow; public MainWindow() { InitializeComponent(); this.PreviewKeyDown = MainWindow_PreviewKeyDown; InitTray(); InitImage(); exitWindow = new ExitWindow(this); exitWindow.Show(); } private void MainWindow_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e) { if (e.Key == Key.Escape) Process.GetCurrentProcess().Kill(); else if( Keyboard.Modifiers == ModifierKeys.Control &&e.KeyStates == Keyboard.GetKeyStates(Key.Space)) { Mangnify(); } } //桌面右下角显示内容 private void InitTray() { MyNotifyIcon = new NotifyIcon(); Uri uri = new Uri(@"\images\ico.ico", UriKind.Relative); MyNotifyIcon.Icon = new System.Drawing.Icon(System.Windows.Application.GetResourceStream(uri).Stream); MyNotifyIcon.BalloonTipText = "magnify has started"; MyNotifyIcon.Visible = true; //MyNotifyIcon.ShowBalloonTip(100); Container container = new Container(); ContextMenuStrip myContextMenuStrip = new ContextMenuStrip(container); myContextMenuStrip.Width = 50; myContextMenuStrip.ShowCheckMargin = false; myContextMenuStrip.Margin = new System.Windows.Forms.Padding(1); ToolStripMenuItem m_magnify = new ToolStripMenuItem("放大"); m_magnify.Click = new EventHandler(m_magnify_Click); myContextMenuStrip.Items.Add(m_magnify); ToolStripMenuItem m_exit = new ToolStripMenuItem("退出"); m_exit.Click = new EventHandler(m_exit_Click); myContextMenuStrip.Items.Add(m_exit); MyNotifyIcon.ContextMenuStrip = myContextMenuStrip; } private void InitImage() { Bitmap bmp = ShotScreen(); image.Width = rc.Width; image.Height = rc.Height; image.Source = BitmapToImagesource(bmp); } private void m_magnify_Click(object sender, EventArgs e) { Mangnify(); } //退出 private void m_exit_Click(object sender, EventArgs e) { MyNotifyIcon.Dispose(); Process.GetCurrentProcess().Kill(); } private void Mangnify() { InitImage(); this.Show(); exitWindow.Show(); } private Bitmap ShotScreen() { Bitmap bmp = new Bitmap(rc.Width, rc.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(bmp)) { g.CopyFromScreen(rc.X, rc.Y, 0, 0, rc.Size, CopyPixelOperation.SourceCopy); } return bmp; } public static ImageSource BitmapToImagesource(Bitmap bmp) { if (bmp == null) return null; ImageSource m_ImageSource = null; ImageSourceConverter imageSourceConverter = new ImageSourceConverter(); MemoryStream stream = new MemoryStream(); bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Png); m_ImageSource = (ImageSource)imageSourceConverter.ConvertFrom(stream); return m_ImageSource; } //放大 private void imageArea_PreviewMouseMove(object sender, System.Windows.Input.MouseEventArgs e) { System.Windows.Point rate = new System.Windows.Point(5, 5); System.Windows.Point pos = e.MouseDevice.GetPosition(rootLayout); //相对于outsideGrid 获取鼠标的坐标 Rect viewBox = vb.Viewbox; //这里的Viewbox和前台的一样 这里就是获取前台Viewbox的值 double xoffset = 0; //因为鼠标要让它在矩形(放大镜)的中间 那么我们就要让矩形的左上角重新移动位置 double yoffset = 0; xoffset = magnifierEllipse.ActualWidth / 2; yoffset = magnifierEllipse.ActualHeight / 2; viewBox.X = pos.X - xoffset (magnifierEllipse.ActualWidth - magnifierEllipse.ActualWidth / rate.X) / 2; viewBox.Y = pos.Y - yoffset (magnifierEllipse.ActualHeight - magnifierEllipse.ActualHeight / rate.Y) / 2; vb.Viewbox = viewBox; Canvas.SetLeft(magnifierCanvas, pos.X - xoffset); //同理重新定位Canvas magnifierCanvas的坐标 Canvas.SetTop(magnifierCanvas, pos.Y - yoffset); } }}