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门户网站建设内容,手工制作房子,网站左侧悬浮,企业网站空间多大合适如何在图片上绘制马赛克效果标 题#xff1a;如何在图片上绘制马赛克效果作 者#xff1a;WPFDevelopersOrg - 驚鏵原文链接[1]#xff1a;https://github.com/WPFDevelopersOrg/WPFDevelopers码云链接[2]#xff1a;https://gitee.com/WPFDevelopersOrg/WPFDevelopers…如何在图片上绘制马赛克效果标 题如何在图片上绘制马赛克效果作 者WPFDevelopersOrg -驚鏵原文链接[1]https://github.com/WPFDevelopersOrg/WPFDevelopers码云链接[2]https://gitee.com/WPFDevelopersOrg/WPFDevelopers需求需要在图片上绘制马赛克效果并切可以切换显示不同的图片。通过按钮进行切换背景图片。能够在图片上绘制马赛克效果。1. 新增MainWindow.xaml代码如下Canvas: 我们使用Canvas控件作为绘图区域CanvasBackground用于显示切换的背景图片。Buttons: 左侧和右侧的按钮用于切换背景图片。wd:Window x:ClassImageMosaic.MainWindow xmlnshttp://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:xhttp://schemas.microsoft.com/winfx/2006/xaml xmlns:dhttp://schemas.microsoft.com/expression/blend/2008 xmlns:localclr-namespace:ImageMosaic xmlns:mchttp://schemas.openxmlformats.org/markup-compatibility/2006 xmlns:wdhttps://github.com/WPFDevelopersOrg/WPFDevelopers TitleMosaic Width800 Height450 mc:Ignorabled Grid Grid.ColumnDefinitions ColumnDefinition WidthAuto / ColumnDefinition / ColumnDefinition WidthAuto / /Grid.ColumnDefinitions Canvas x:NamePART_Canvas Grid.ColumnSpan3 Canvas.Background ImageBrush x:NameCanvasBackground StretchUniformToFill / /Canvas.Background /Canvas Button Grid.Column0 Width50 Height50 wd:ElementHelper.IsRoundTrue Background#80000000 ClickPrevButton_Click Style{StaticResource WD.DefaultButton} wd:PathIcon KindPrevious / /Button Button Grid.Column2 Width50 Height50 wd:ElementHelper.IsRoundTrue Background#80000000 ClickNextButton_Click Style{StaticResource WD.DefaultButton} wd:PathIcon KindNext / /Button /Grid /wd:Window2. 新增MainWindow.xaml代码如下字段定义:_imageSnapshot: 用于存储当Image的快照用于后面马赛克绘制。_pointStart: 记录鼠标按下时的位置用于绘制马赛克。_backgroundImages: 存储加载的Image列表。_currentImageIndex: 当前显示的Image索引。构造函数: 初始化控件加载Image并设置事件。LoadImages: 读取指定路径的Image并将其添加到_backgroundImages列表中。UpdateBackground: 更新画布的Backgroup处理图像切换并在Canvas加载完毕后拍摄快照。按钮事件:PrevButton_Click和NextButton_Click用于切换Image。鼠标事件: 处理鼠标点击、移动和释放事件用于绘制马赛克效果。TakeSnapshot方法: 创建当前画布的快照以便后续绘制马赛克效果。DrawMosaicBlock方法: 在鼠标拖动时绘制马赛克块利用GetAreaAverageColor方法获取区域的平均颜色。GetAreaAverageColor方法: 计算给定区域内的平均颜色并返回相应的颜色值。public partialclassMainWindow { private RenderTargetBitmap _imageSnapshot; private Point? _pointStart; private ListImageSource _backgroundImages new ListImageSource(); privateint _currentImageIndex 0; public MainWindow() { InitializeComponent(); LoadImages(); Loaded OnMainWindow_Loaded; UpdateBackground(); } private void LoadImages() { _backgroundImages.Clear(); string[] imagePaths { 08bf74e1e5922117c4be2f6735b078bb.jpg, 0943484gC8g.jpg, 104022Bj7Vj.jpg, 234506wB8aC.jpg, 1a374f1629daeb4dea9782d09b47d823.jpg }; foreach (var path in imagePaths) { try { var bitmap new BitmapImage(); bitmap.BeginInit(); bitmap.UriSource new Uri($pack://application:,,,/{path}, UriKind.Absolute); bitmap.CacheOption BitmapCacheOption.OnLoad; bitmap.EndInit(); _backgroundImages.Add(bitmap); } catch (Exception ex) { } } } private void UpdateBackground() { PART_Canvas.Children.Clear(); if (_backgroundImages.Count 0) return; if (_currentImageIndex 0) _currentImageIndex _backgroundImages.Count - 1; if (_currentImageIndex _backgroundImages.Count) _currentImageIndex 0; CanvasBackground.ImageSource _backgroundImages[_currentImageIndex]; if (PART_Canvas.IsLoaded) TakeSnapshot(); } private void PrevButton_Click(object sender, RoutedEventArgs e) { _currentImageIndex--; UpdateBackground(); } private void NextButton_Click(object sender, RoutedEventArgs e) { _currentImageIndex; UpdateBackground(); } private void OnMainWindow_Loaded(object sender, RoutedEventArgs e) { TakeSnapshot(); } protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e) { base.OnPreviewMouseLeftButtonDown(e); _pointStart e.GetPosition(PART_Canvas); } protected override void OnPreviewMouseMove(MouseEventArgs e) { if (e.LeftButton MouseButtonState.Pressed _pointStart.HasValue) { var current e.GetPosition(PART_Canvas); if ((current - _pointStart.Value).Length 10) return; _pointStart current; DrawMosaicBlock(current, 10, 20); } } protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e) { _pointStart null; } private void TakeSnapshot() { PART_Canvas.Measure(new System.Windows.Size(PART_Canvas.ActualWidth, PART_Canvas.ActualHeight)); PART_Canvas.Arrange(new Rect(0, 0, PART_Canvas.ActualWidth, PART_Canvas.ActualHeight)); _imageSnapshot new RenderTargetBitmap( (int)PART_Canvas.ActualWidth, (int)PART_Canvas.ActualHeight, 96, 96, PixelFormats.Pbgra32); _imageSnapshot.Render(PART_Canvas); } private void DrawMosaicBlock(Point center, int blockSize, int brushSize) { if (_imageSnapshot null) return; int mosaicSize blockSize; int blocksPerRow brushSize / mosaicSize; for (int i 0; i blocksPerRow; i) { for (int j 0; j blocksPerRow; j) { double x center.X - brushSize / 2 i * mosaicSize; double y center.Y - brushSize / 2 j * mosaicSize; Point blockCenter new Point(x mosaicSize / 2, y mosaicSize / 2); Color color GetAreaAverageColor(blockCenter, mosaicSize); var block new Rectangle { Width mosaicSize, Height mosaicSize, Fill new SolidColorBrush(color), IsHitTestVisible false }; Canvas.SetLeft(block, x); Canvas.SetTop(block, y); PART_Canvas.Children.Add(block); } } } private Color GetAreaAverageColor(Point center, int areaSize) { try { double scaleX _imageSnapshot.PixelWidth / PART_Canvas.ActualWidth; double scaleY _imageSnapshot.PixelHeight / PART_Canvas.ActualHeight; int pixelX (int)(center.X * scaleX); int pixelY (int)(center.Y * scaleY); int halfSize areaSize / 2; int totalR 0, totalG 0, totalB 0; int count 0; for (int dx -halfSize; dx halfSize; dx) { for (int dy -halfSize; dy halfSize; dy) { int x pixelX dx; int y pixelY dy; if (x 0 x _imageSnapshot.PixelWidth y 0 y _imageSnapshot.PixelHeight) { byte[] pixels newbyte[4]; _imageSnapshot.CopyPixels(new Int32Rect(x, y, 1, 1), pixels, 4, 0); totalR pixels[2]; totalG pixels[1]; totalB pixels[0]; count; } } } if (count 0) return Colors.Gray; return Color.FromRgb( (byte)(totalR / count), (byte)(totalG / count), (byte)(totalB / count)); } catch { return Colors.Gray; } }参考资料[1]原文链接:https://github.com/WPFDevelopersOrg/WPFDevelopers[2]码云链接:https://gitee.com/WPFDevelopersOrg/WPFDevelopers