VisualBrush使视觉模糊 [英] VisualBrush makes Visual blurred

问题描述

我有一个问题与WPF VisualBrush 。 此处您可以从我的应用程序中找到两个图片。较大的是显示带有文本的控件的图像。较小的一个是从我第一次提取，我使用视觉刷来做它。我的问题是，当我的Visual（内容 VisualBrush ）的分辨率会更小，那么视觉画刷看起来更模糊。我不知道为什么。我使用下面的代码来声明视觉画笔。

  var blendBrush = new VisualBrush 
 {
 Visual = Host.Viewer，
 TileMode = TileMode.None，
 AlignmentX = AlignmentX.Left，
 AlignmentY = AlignmentY.Top，
 Stretch = Stretch.None，
 ViewboxUnits = BrushMappingMode.Absolute，
}; 
  

Host.Viewer 它在大图像上。每次更改控件大小时，使用以下例程更新 ViewBox 值：

  var viewBox = new System.Windows.Rect（topLeft，new Size（width，height））; 
 visualBrush.Viewbox = viewBox; 
  

topLeft 是开始坐标， code> width 和 height 值是我需要的提取大小。

感谢
丹尼尔

div class =h2_lin>解决方案

好的，我发现了问题。 Host.Viewer 深深地包含一个包含图像对象的画布。图像可能看起来模糊的.NET 4.0及更高版本。该问题可以解决为设置 UseLayoutRounding = true; 和 BitmapScalingMode = BitmapScalingMode.NearestNeighbor; > Canvas 和Rootparent对象。

i have a problem with the WPF VisualBrush. Here you find two images from my application. The bigger on is a image which shows a control with text. The smaller one is a extract from the first on who i use a visual brush to make it. My problem is, that when the resolution of my Visual (the content for VisualBrush) would be smaller then the visual brush looks more blurred. I don't no why. I use the following code to declare the visual brush.

 var blendBrush = new VisualBrush
        {
            Visual = Host.Viewer,
            TileMode = TileMode.None,
            AlignmentX = AlignmentX.Left,
            AlignmentY = AlignmentY.Top,
            Stretch = Stretch.None,
            ViewboxUnits = BrushMappingMode.Absolute,
        };

Host.Viewer is the control you see it on the big image. Everytime the control size is changed i update the ViewBox values with the following routine:

var viewBox = new System.Windows.Rect(topLeft, new Size(width, height));
        visualBrush.Viewbox = viewBox;

topLeft is the start coordinates and the width and height values are the size of extract i needed. I hope anyone can help how i can prevent that the control would be blurry!

Thanks Daniel

解决方案

Okay i found the problem. Host.Viewer contains in deeply part a canvas which contains a image object. Images could look blurry in .NET 4.0 and higher. The problem could resolve to set UseLayoutRounding = true; and BitmapScalingMode = BitmapScalingMode.NearestNeighbor; for the Canvas and the Rootparent-object.

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