广州天河做网站,中咨城建设计有限公司 网站,网站设计模板之家,个人承接网站开发服务文章目录 前言一、如何实现#xff1f;1、制作无边框窗口2、Viewbox放大3、截屏显示#xff08;1#xff09;、截屏#xff08;2#xff09;、转BitmapSource#xff08;3#xff09;、显示 4、定时截屏 二、完整代码三、效果预览总结 前言
做桌面截屏功能时需要放大镜… 文章目录 前言一、如何实现1、制作无边框窗口2、Viewbox放大3、截屏显示1、截屏2、转BitmapSource3、显示 4、定时截屏 二、完整代码三、效果预览总结 前言
做桌面截屏功能时需要放大镜显示鼠标所在位置的放大图像在wpf中使用Bursh的ViewBox属性可以实现图像放大桌面的画面则需要截屏了总的来说还是比较容易实现的。 一、如何实现
1、制作无边框窗口
推荐使用WindowChrome
Window Background{x:Null} ResizeModeNoResize WindowStyleNoneWindowChrome放在Window 标签内
WindowChrome.WindowChromeWindowChrome GlassFrameThickness-1 CaptionHeight0 /
/WindowChrome.WindowChrome2、Viewbox放大
定义一个Ellipse 控件作为放大镜Viewbox默认为相对单位即范围时0-1值越小放大比例越大
Ellipse StrokeLightBlueEllipse.FillImageBrush x:Nameib Viewbox0,0,0.5,0.5 //Ellipse.Fill
/Ellipse3、截屏显示
1、截屏
参考《C# wpf 使用GDI实现截屏》里的简单截屏即完成。获取的数据类型为Bitmap。
2、转BitmapSource
参考《C# wpf Bitmap转换成WriteableBitmapBitmapSource的方法》将Bitmap转换为转换成wpf对象。
3、显示
获取到BitmapSource给控件赋值即可。
//显示到界面
ib.ImageSource wb;4、定时截屏
显示桌面必然需要实时的画面所以需要定时截屏。
//启动定时器截屏
var dispatcherTimer new DispatcherTimer() { Interval TimeSpan.FromMilliseconds(33), };
dispatcherTimer.Tick (s, e)
{//截屏并显示
};
dispatcherTimer.Start();二、完整代码
完整代码依赖System.Drawing添加引用方法可以参考《C# wpf 使用GDI实现截屏》。
MainWindow.xaml
Window x:ClassWpfMagnifier.MainWindowxmlnshttp://schemas.microsoft.com/winfx/2006/xaml/presentationxmlns:xhttp://schemas.microsoft.com/winfx/2006/xamlxmlns:dhttp://schemas.microsoft.com/expression/blend/2008xmlns:mchttp://schemas.openxmlformats.org/markup-compatibility/2006xmlns:localclr-namespace:WpfMagnifiermc:IgnorabledBackground{x:Null}ResizeModeNoResizeWindowStyleNoneShowInTaskbarFalseTopmostTrueTitleMainWindow Height200 Width200 MouseLeftButtonDownWindow_MouseDownWindowChrome.WindowChromeWindowChrome GlassFrameThickness-1 CaptionHeight0 //WindowChrome.WindowChromeEllipse StrokeLightBlueEllipse.FillImageBrush x:Nameib Viewbox0,0,0.5,0.5 //Ellipse.Fill/Ellipse
/WindowMainWindow.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
namespace WpfMagnifier
{/// summary/// Interaction logic for MainWindow.xaml/// /summarypublic partial class MainWindow : Window{public MainWindow(){InitializeComponent();//启动定时器截屏var dispatcherTimer new DispatcherTimer() { Interval TimeSpan.FromMilliseconds(33), };dispatcherTimer.Tick (s, e) {//gdi截屏截取窗口左边的区域可根据具体使用场景调整截屏位置,使用PointToScreen消除dpi影响var leftTop PointToScreen(new Point(-Width, 0));var rightBottom PointToScreen(new Point(0, Height));var bm Snapshot((int)leftTop.X, (int)leftTop.Y, (int)(rightBottom.X - leftTop.X), (int)(rightBottom.Y - leftTop.Y));var wb BitmapToWriteableBitmap(bm);//显示到界面ib.ImageSource wb;};dispatcherTimer.Start();}private void Window_MouseDown(object sender, MouseButtonEventArgs e){DragMove();}/// summary/// 截取一帧图片/// /summary/// param namexx坐标/param/// param nameyy坐标/param/// param namewidth宽/param/// param nameheight高/param/// returns截屏后的位图对象需要调用Dispose手动释放资源。/returnspublic static System.Drawing.Bitmap Snapshot(int x, int y, int width, int height){System.Drawing.Bitmap bitmap new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);using (System.Drawing.Graphics graphics System.Drawing.Graphics.FromImage(bitmap)){graphics.CopyFromScreen(x, y, 0, 0, new System.Drawing.Size(width, height), System.Drawing.CopyPixelOperation.SourceCopy);}return bitmap;}//将Bitmap 转换成WriteableBitmap public static WriteableBitmap BitmapToWriteableBitmap(System.Drawing.Bitmap src){var wb CreateCompatibleWriteableBitmap(src);System.Drawing.Imaging.PixelFormat format src.PixelFormat;if (wb null){wb new WriteableBitmap(src.Width, src.Height, 0, 0, System.Windows.Media.PixelFormats.Bgra32, null);format System.Drawing.Imaging.PixelFormat.Format32bppArgb;}BitmapCopyToWriteableBitmap(src, wb, new System.Drawing.Rectangle(0, 0, src.Width, src.Height), 0, 0, format);return wb;}//创建尺寸和格式与Bitmap兼容的WriteableBitmappublic static WriteableBitmap CreateCompatibleWriteableBitmap(System.Drawing.Bitmap src){System.Windows.Media.PixelFormat format;switch (src.PixelFormat){case System.Drawing.Imaging.PixelFormat.Format16bppRgb555:format System.Windows.Media.PixelFormats.Bgr555;break;case System.Drawing.Imaging.PixelFormat.Format16bppRgb565:format System.Windows.Media.PixelFormats.Bgr565;break;case System.Drawing.Imaging.PixelFormat.Format24bppRgb:format System.Windows.Media.PixelFormats.Bgr24;break;case System.Drawing.Imaging.PixelFormat.Format32bppRgb:format System.Windows.Media.PixelFormats.Bgr32;break;case System.Drawing.Imaging.PixelFormat.Format32bppPArgb:format System.Windows.Media.PixelFormats.Pbgra32;break;case System.Drawing.Imaging.PixelFormat.Format32bppArgb:format System.Windows.Media.PixelFormats.Bgra32;break;default:return null;}return new WriteableBitmap(src.Width, src.Height, 0, 0, format, null);}//将Bitmap数据写入WriteableBitmap中public static void BitmapCopyToWriteableBitmap(System.Drawing.Bitmap src, WriteableBitmap dst, System.Drawing.Rectangle srcRect, int destinationX, int destinationY, System.Drawing.Imaging.PixelFormat srcPixelFormat){var data src.LockBits(new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), src.Size), System.Drawing.Imaging.ImageLockMode.ReadOnly, srcPixelFormat);dst.WritePixels(new Int32Rect(srcRect.X, srcRect.Y, srcRect.Width, srcRect.Height), data.Scan0, data.Height * data.Stride, data.Stride, destinationX, destinationY);src.UnlockBits(data);}}
}三、效果预览
显示的是窗口放大镜左边的画面 总结
以上就是今天要讲的内容本文仅仅简单介绍了实现桌面放大镜的方法关键在于使用Viewbox截屏的功能因为有现成的所以比较简单当然本文的方法是简单实现其实还是可以优化的尤其是截屏是可以复用Bitmap对象的。总的来说wpf实现桌面放大镜还是比较容易的而且效果也很不错。
