rendertargetbitmap | 易学教程

Create WPF element offscreen and render to bitmap

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I can't understand why this doesn't work, or what I need to get it to work. To repro, create a simple WPF application and replace the main window's constructor thusly: public MainWindow() { InitializeComponent(); // simple visual definition var grid = new Grid { Width = 300, Height = 300 }; var text = new TextBlock { Text = "Y DON'T I WORK???", FontSize = 100, FontWeight = FontWeights.Bold }; grid.Children.Add(text); // update the layout so everything is awesome cool grid.Measure(grid.DesiredSize); grid.Arrange(new Rect(grid.DesiredSize)); grid.UpdateLayout(); // create a BitmapSource from the

RenderTargetBitmap + Resource'd VisualBrush = incomplete image

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问题 I've found a new twist on the "Visual to RenderTargetBitmap" question! I'm rendering previews of WPF stuff for a designer. That means I need to take a WPF visual and render it to a bitmap without that visual ever being displayed. Got a nice little method to do it like to see it here it goes private static BitmapSource CreateBitmapSource(FrameworkElement visual) { Border b = new Border { Width = visual.Width, Height = visual.Height }; b.BorderBrush = Brushes.Black; b.BorderThickness = new

How to convert a XPS file to an image in high quality (rather than blurry low resolution)?

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问题 I'm trying to convert an XPS with WPF. The idea is that these images can be loaded with silverlight 4, for this I am using the following code: // XPS Document XpsDocument xpsDoc = new XpsDocument(xpsFileName, System.IO.FileAccess.Read); FixedDocumentSequence docSeq = xpsDoc.GetFixedDocumentSequence(); // The number of pages PageCount = docSeq.References[0].GetDocument(false).Pages.Count; DocumentPage sizePage = docSeq.DocumentPaginator.GetPage(0); PageHeight = sizePage.Size.Height; PageWidth

Snapshot of an WPF Canvas Area using RenderTargetBitmap

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I want to create a Snapshot of the Canvas Area in my Application. I'm using Visual brush to get the Snapshot and saving the same using PngEncoder. But the resulting PNG is just a empty black image. I'm not sure the issue is with the BitmapSource created or the PNGEncoder issue. Here is the code I'm using to obtain the same. public void ConvertToBitmapSource(UIElement element) { var target = new RenderTargetBitmap((int)(element.RenderSize.Width), (int)(element.RenderSize.Height), 96, 96, PixelFormats.Pbgra32); var brush = new VisualBrush(element); var visual = new DrawingVisual(); var

WPF RenderTargetBitmap downscaling TextRenderMode to GreyScale

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问题 RenderTargetBitmap removes downgrades a RichtextBox's TextRenderingMode to GreyScale. So a captured PNG looks poor quality and doesnt match the WPF control If I use WINDOWS ALT+PRINT SCREEN, the text is captured perfectly. So how can I render the text control to the same quality as ALT+PRINT SCREEN. Any advice would seriously be appreciated All the best 回答1: You can use the same technique to render your window into the bitmap as windows using when taking a screen shot with Alt + Print Screen

Create WPF element offscreen and render to bitmap

阅读更多关于 Create WPF element offscreen and render to bitmap

问题 I can't understand why this doesn't work, or what I need to get it to work. To repro, create a simple WPF application and replace the main window's constructor thusly: public MainWindow() { InitializeComponent(); // simple visual definition var grid = new Grid { Width = 300, Height = 300 }; var text = new TextBlock { Text = "Y DON'T I WORK???", FontSize = 100, FontWeight = FontWeights.Bold }; grid.Children.Add(text); // update the layout so everything is awesome cool grid.Measure(grid

Snapshot of an WPF Canvas Area using RenderTargetBitmap

阅读更多关于 Snapshot of an WPF Canvas Area using RenderTargetBitmap

问题 I want to create a Snapshot of the Canvas Area in my Application. I'm using Visual brush to get the Snapshot and saving the same using PngEncoder. But the resulting PNG is just a empty black image. I'm not sure the issue is with the BitmapSource created or the PNGEncoder issue. Here is the code I'm using to obtain the same. public void ConvertToBitmapSource(UIElement element) { var target = new RenderTargetBitmap((int)(element.RenderSize.Width), (int)(element.RenderSize.Height), 96, 96,