.基本图形使用图形操作.docVIP

接上一篇文章，在WPF中对图形进行操作，上一篇文章中使用了ImageSource（BitmapSource）中的两种： 1、使用BitmapImage加载图片 2、使用RenderTargetBitmap创建图片 3、使用RenderTargetBitmap修改图片 本文继续 4、使用WriteableBitmap修改图片 在使用RenderTargetBitmap修改图片中，原图片不变，只相当于在原图片的基础上添加一节新的内容，而如果对图片进行大的更改RenderTargetBitmap就不可以了，我们可以使用WriteableBitmap对图片进行修改，例如将生成一个返向位图： 1: Window x:Class=WPF_28.Window1 2: xmlns=/winfx/2006/xaml/presentation 3: xmlns:x=/winfx/2006/xaml 4: Title=Window1 Height=300 Width=300 Loaded=Window_Loaded 5: Grid 6: Grid.RowDefinitions 7: RowDefinition Height=1* / 8: RowDefinition Height=1* / 9: /Grid.RowDefinitions 10: Image Grid.Row=0 x:Name=sourceImage Source=/logo.gif / 11: Image Grid.Row=1 x:Name=targetImage / 12: /Grid 13: /Window ? 1: private void BuildImage() 2: { 3: BitmapImage img = new BitmapImage(); 4: img.BeginInit(); 5:? 6: img.UriSource = new Uri(/logo.gif); 7:? 8: img.DownloadCompleted += delegate 9: { 10: BitmapSource source = new FormatConvertedBitmap( 11: img, PixelFormats.Pbgra32, null, 0); 12:? 13: WriteableBitmap bmp = new WriteableBitmap(source); 14:? 15: int width = bmp.PixelWidth; 16: int height = bmp.PixelHeight; 17:? 18: int[] pixelData = new int[width * height]; 19: int widthInBytes = 4 * width; 20:? 21: bmp.CopyPixels(pixelData, widthInBytes, 0); 22:? 23: for (int i = 0; i pixelData.Length; i++) 24: { 25: pixelData[i] ^= 0x00ffffff; 26: } 27:? 28: bmp.WritePixels(new Int32Rect(0, 0, width, height), pixelData, widthInBytes, 0); 29:? 30: targetImage.Source = bmp; 31: }; 32:? 33: img.EndInit(); 34: } 35:? 36: private void Window_Loaded(object sender, RoutedEventArgs e) 37: { 38: BuildImage(); 39: } 执行后的结果如下图所示： 5、图像效果 所有的用户界面元素都有BitmapEffect