使用影像、繪圖和視覺效果繪製

本主題描述如何使用 ImageBrushDrawingBrushVisualBrush 物件繪製具有影像、 Drawing 或 的區域 Visual

必要條件

若要瞭解本主題,您應該熟悉 Windows Presentation Foundation (WPF) 所提供的不同類型的筆刷及其基本功能。 如需簡介,請參閱 WPF 筆刷概觀

使用影像繪製區域

繪製 ImageBrush 具有 ImageSource 的區域。 與 搭配 ImageBrush 使用的最常見類型 ImageSource 是 , BitmapImage 其描述點陣圖圖形。 您可以使用 來 DrawingImage 繪製 Drawing 物件,但改用 會比較 DrawingBrush 簡單。 如需物件的詳細資訊 ImageSource ,請參閱 映射概觀

若要使用 ImageBrush 繪製 ,請建立 BitmapImage 並用它來載入點陣圖內容。 然後,使用 BitmapImage 來設定 ImageSourceImageBrush 屬性。 最後,將 套用 ImageBrush 至您想要繪製的物件。 在 Extensible Application Markup Language (XAML)中,您也可以將 的 屬性 ImageBrush 設定 ImageSource 為要載入的影像路徑。

和所有 Brush 物件一樣, ImageBrush 可以用來繪製物件,例如圖形、面板、控制項和文字。 下圖顯示可使用 的 ImageBrush 一些效果。

ImageBrush output examples
ImageBrush 所繪製的物件

根據預設, ImageBrush 延展其影像以完全填滿要繪製的區域,如果繪製的區域與影像的外觀比例不同,則可能會扭曲影像。 您可以將 屬性的預設值 Fill 變更 StretchNoneUniformUniformToFill ,以變更此行為。 因為 ImageBrush 是 的 TileBrush 型別,您可以指定影像筆刷如何填滿輸出區域,甚至建立模式。 如需進階 TileBrush 功能的詳細資訊,請參閱 TileBrush 概觀

範例:使用點陣圖影像繪製物件

下列範例使用 ImageBrush 繪製 BackgroundCanvas

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="Microsoft.Samples.BrushExamples.ImageBrushExample"
  WindowTitle="ImageBrush Example"
  Background="White">

  <StackPanel>

    <Canvas
      Height="200" Width="300">
      <Canvas.Background>
        <ImageBrush ImageSource="sampleImages\Waterlilies.jpg" />
      </Canvas.Background>
    </Canvas>

    
  </StackPanel>
</Page>
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace Microsoft.Samples.BrushExamples
{

    public class ImageBrushExample : Page
    {

        public ImageBrushExample()
        {

            StackPanel mainPanel = new StackPanel();
            canvasBackgroundExample(mainPanel);
            this.Content = mainPanel;
        }

        private void canvasBackgroundExample(Panel mainPanel)
        {

            BitmapImage theImage = new BitmapImage
                (new Uri("sampleImages\\Waterlilies.jpg", UriKind.Relative));

            ImageBrush myImageBrush = new ImageBrush(theImage);

            Canvas myCanvas = new Canvas();
            myCanvas.Width = 300;
            myCanvas.Height = 200;
            myCanvas.Background = myImageBrush;

            mainPanel.Children.Add(myCanvas);
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Imaging

Namespace Microsoft.Samples.BrushExamples

    Public Class ImageBrushExample
        Inherits Page

        Public Sub New()

            Dim mainPanel As New StackPanel()
            canvasBackgroundExample(mainPanel)
            Me.Content = mainPanel

        End Sub


        Private Sub canvasBackgroundExample(ByVal mainPanel As Panel)

            Dim theImage As New BitmapImage(New Uri("sampleImages\Waterlilies.jpg", UriKind.Relative))

            Dim myImageBrush As New ImageBrush(theImage)

            Dim myCanvas As New Canvas()
            myCanvas.Width = 300
            myCanvas.Height = 200
            myCanvas.Background = myImageBrush

            mainPanel.Children.Add(myCanvas)


        End Sub

    End Class

End Namespace

使用繪圖繪製區域

DrawingBrush可讓您使用圖形、文字、影像和視訊繪製區域。 繪圖筆刷內的圖形可能會以純色、漸層、影像,甚至是另一個 DrawingBrush 繪製。 下圖示范 的 DrawingBrush 一些用法。

DrawingBrush output examples
DrawingBrush 所繪製的物件

繪製 DrawingBrush 具有 Drawing 物件的區域。 Drawing物件描述可見的內容,例如圖形、點陣圖、視訊或文字行。 不同類型的繪圖可描繪不同類型的內容。 以下列出不同類型的繪圖物件。

如需物件的詳細資訊 Drawing ,請參閱 繪圖物件概觀

ImageBrush如同 ,會 DrawingBrush 延展其 Drawing 以填滿其輸出區域。 您可以將 屬性從 的預設設定 Fill 變更 Stretch 為 ,以覆寫此行為。 如需詳細資訊,請參閱 Stretch 屬性 (Property)。

範例:使用繪圖繪製物件

下列範例顯示如何使用含有三個橢圓形的繪圖來繪製物件。 GeometryDrawing用來描述省略號。

<Button Content="A Button">
  <Button.Background>
    <DrawingBrush>
      <DrawingBrush.Drawing>
        <GeometryDrawing Brush="LightBlue">
          <GeometryDrawing.Geometry>
            <GeometryGroup>
              <EllipseGeometry RadiusX="12.5" RadiusY="25" Center="25,50" />
              <EllipseGeometry RadiusX="12.5" RadiusY="25" Center="50,50" />
              <EllipseGeometry RadiusX="12.5" RadiusY="25" Center="75,50" />
            </GeometryGroup>
          </GeometryDrawing.Geometry>
          <GeometryDrawing.Pen>
            <Pen Thickness="1" Brush="Gray" />
          </GeometryDrawing.Pen>
        </GeometryDrawing>
      </DrawingBrush.Drawing>
    </DrawingBrush>
  </Button.Background>
</Button>
// Create a DrawingBrush.
DrawingBrush myDrawingBrush = new DrawingBrush();

// Create a drawing.
GeometryDrawing myGeometryDrawing = new GeometryDrawing();
myGeometryDrawing.Brush = Brushes.LightBlue;
myGeometryDrawing.Pen = new Pen(Brushes.Gray, 1);
GeometryGroup ellipses = new GeometryGroup();
ellipses.Children.Add(new EllipseGeometry(new Point(25,50), 12.5, 25));
ellipses.Children.Add(new EllipseGeometry(new Point(50,50), 12.5, 25));
ellipses.Children.Add(new EllipseGeometry(new Point(75,50), 12.5, 25));

myGeometryDrawing.Geometry = ellipses;
myDrawingBrush.Drawing = myGeometryDrawing;

Button myButton = new Button();
myButton.Content = "A Button";

// Use the DrawingBrush to paint the button's background.
myButton.Background = myDrawingBrush;
' Create a DrawingBrush.
Dim myDrawingBrush As New DrawingBrush()

' Create a drawing.
Dim myGeometryDrawing As New GeometryDrawing()
myGeometryDrawing.Brush = Brushes.LightBlue
myGeometryDrawing.Pen = New Pen(Brushes.Gray, 1)
Dim ellipses As New GeometryGroup()
ellipses.Children.Add(New EllipseGeometry(New Point(25,50), 12.5, 25))
ellipses.Children.Add(New EllipseGeometry(New Point(50,50), 12.5, 25))
ellipses.Children.Add(New EllipseGeometry(New Point(75,50), 12.5, 25))

myGeometryDrawing.Geometry = ellipses
myDrawingBrush.Drawing = myGeometryDrawing

Dim myButton As New Button()
myButton.Content = "A Button"

' Use the DrawingBrush to paint the button's background.
myButton.Background = myDrawingBrush

使用 Visual 繪製區域

所有筆刷中最多才多藝且最強大,用 VisualBrush 繪製區域 VisualVisual是低階圖形類型,可作為許多實用圖形元件的上階。 例如, WindowFrameworkElementControl 類別是所有類型的 Visual 物件。 VisualBrush使用 ,您可以使用幾乎任何 Windows Presentation Foundation (WPF) 繪圖物件繪製區域。

注意

雖然 VisualBrush 是 物件的類型 Freezable ,但是當物件的 Visual 屬性設定為 以外的 null 值時,它不能凍結(唯讀)。

有兩種方式可以指定 Visual 的內容 VisualBrush

當您為 VisualBrush 定義 的新 VisualVisual 且 為 UIElement (例如面板或控制項),當 屬性設定 true 為 時 AutoLayoutContent ,配置系統會在 和 其子項目上 UIElement 執行。 不過,根 UIElement 基本上與系統的其餘部分隔離:樣式和外部配置無法滲透到此界限。 因此,您應該明確指定根 UIElement 的大小,因為其唯一的父系是 VisualBrush ,因此它無法自動將本身大小調整為繪製的區域。 如需 Windows Presentation Foundation 中版面配置的詳細資訊,請參閱 版面配置

如同 ImageBrushDrawingBrush ,會 VisualBrush 延展其內容以填滿其輸出區域。 您可以將 屬性從 的預設設定 Fill 變更 Stretch 為 ,以覆寫此行為。 如需詳細資訊,請參閱 Stretch 屬性 (Property)。

範例:使用視覺效果繪製物件

下列範例會使用多個控制項與一個面板來繪製矩形。

<Rectangle Width="150" Height="150" Stroke="Black" Margin="5,0,5,0">
  <Rectangle.Fill>
    <VisualBrush>
      <VisualBrush.Visual>
        <StackPanel Background="White">
          <Rectangle Width="25" Height="25" Fill="Red" Margin="2" />
          <TextBlock FontSize="10pt" Margin="2">Hello, World!</TextBlock>
          <Button Margin="2">A Button</Button>
        </StackPanel>
      </VisualBrush.Visual>
    </VisualBrush>
  </Rectangle.Fill>
</Rectangle>
VisualBrush myVisualBrush = new VisualBrush();

// Create the visual brush's contents.
StackPanel myStackPanel = new StackPanel();
myStackPanel.Background = Brushes.White;

Rectangle redRectangle = new Rectangle();
redRectangle.Width = 25;
redRectangle.Height =25;
redRectangle.Fill = Brushes.Red;
redRectangle.Margin = new Thickness(2);
myStackPanel.Children.Add(redRectangle);

TextBlock someText = new TextBlock();
FontSizeConverter myFontSizeConverter = new FontSizeConverter();
someText.FontSize = (double)myFontSizeConverter.ConvertFrom("10pt");
someText.Text = "Hello, World!";
someText.Margin = new Thickness(2);
myStackPanel.Children.Add(someText);

Button aButton = new Button();
aButton.Content = "A Button";
aButton.Margin = new Thickness(2);
myStackPanel.Children.Add(aButton);

// Use myStackPanel as myVisualBrush's content.
myVisualBrush.Visual = myStackPanel;

// Create a rectangle to paint.
Rectangle myRectangle = new Rectangle();
myRectangle.Width = 150;
myRectangle.Height = 150;
myRectangle.Stroke = Brushes.Black;
myRectangle.Margin = new Thickness(5,0,5,0);

// Use myVisualBrush to paint myRectangle.
myRectangle.Fill = myVisualBrush;

Dim myVisualBrush As New VisualBrush()

' Create the visual brush's contents.
Dim myStackPanel As New StackPanel()
myStackPanel.Background = Brushes.White

Dim redRectangle As New Rectangle()
With redRectangle
    .Width = 25
    .Height = 25
    .Fill = Brushes.Red
    .Margin = New Thickness(2)
End With
myStackPanel.Children.Add(redRectangle)

Dim someText As New TextBlock()
Dim myFontSizeConverter As New FontSizeConverter()
someText.FontSize = CDbl(myFontSizeConverter.ConvertFrom("10pt"))
someText.Text = "Hello, World!"
someText.Margin = New Thickness(2)
myStackPanel.Children.Add(someText)

Dim aButton As New Button()
aButton.Content = "A Button"
aButton.Margin = New Thickness(2)
myStackPanel.Children.Add(aButton)

' Use myStackPanel as myVisualBrush's content.
myVisualBrush.Visual = myStackPanel

' Create a rectangle to paint.
Dim myRectangle As New Rectangle()
With myRectangle
    .Width = 150
    .Height = 150
    .Stroke = Brushes.Black
    .Margin = New Thickness(5, 0, 5, 0)
End With

' Use myVisualBrush to paint myRectangle.
myRectangle.Fill = myVisualBrush

範例:建立反映

上述範例示範如何建立新的 Visual ,以作為背景使用。 您也可以使用 VisualBrush 來顯示現有的視覺效果;這項功能可讓您產生有趣的視覺效果,例如反射和放大。 下列範例會使用 VisualBrush 建立包含數個專案的 Border 反映。 下圖顯示的是這個範例產生的輸出。

A reflected Visual object
反映後的 Visual 物件

using System;
using System.Windows;
using System.Windows.Data;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
using System.IO;
using System.Collections.ObjectModel;
using System.Windows.Shapes;
namespace SDKSample
{
    public partial class ReflectionExample : Page
    {
        public ReflectionExample()
        {
            // Create a name scope for the page.
            NameScope.SetNameScope(this, new NameScope());

            this.Background = Brushes.Black;
            StackPanel myStackPanel = new StackPanel();
            myStackPanel.Margin = new Thickness(50);

            Border myReflectedBorder = new Border();
            this.RegisterName("ReflectedVisual", myReflectedBorder);

            // Create a gradient background for the border.
            GradientStop firstStop = new GradientStop();
            firstStop.Offset = 0.0;
            Color firstStopColor = new Color();
            firstStopColor.R = 204;
            firstStopColor.G = 204;
            firstStopColor.B = 255;
            firstStopColor.A = 255;
            firstStop.Color = firstStopColor;
            GradientStop secondStop = new GradientStop();
            secondStop.Offset = 1.0;
            secondStop.Color = Colors.White;

            GradientStopCollection myGradientStopCollection = new GradientStopCollection();
            myGradientStopCollection.Add(firstStop);
            myGradientStopCollection.Add(secondStop);

            LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush();
            myLinearGradientBrush.StartPoint = new Point(0, 0.5);
            myLinearGradientBrush.EndPoint = new Point(1, 0.5);
            myLinearGradientBrush.GradientStops = myGradientStopCollection;

            myReflectedBorder.Background = myLinearGradientBrush;

            // Add contents to the border.
            StackPanel borderStackPanel = new StackPanel();
            borderStackPanel.Orientation = Orientation.Horizontal;
            borderStackPanel.Margin = new Thickness(10);

            TextBlock myTextBlock = new TextBlock();
            myTextBlock.TextWrapping = TextWrapping.Wrap;
            myTextBlock.Width = 200;
            myTextBlock.Text = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit." +
                               " Suspendisse vel ante. Donec luctus tortor sit amet est." +
                               " Nullam pulvinar odio et wisi." +
                               " Pellentesque quis magna. Sed pellentesque." +
                               " Nulla euismod." +
                               "Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.";

            borderStackPanel.Children.Add(myTextBlock);

            StackPanel ellipseStackPanel = new StackPanel();

            Ellipse ellipse1 = new Ellipse();
            ellipse1.Margin = new Thickness(10);
            ellipse1.Height = 50;
            ellipse1.Width = 50;
            ellipse1.Fill = Brushes.Black;
            ellipseStackPanel.Children.Add(ellipse1);
            Ellipse ellipse2 = new Ellipse();
            ellipse2.Margin = new Thickness(10);
            ellipse2.Height = 50;
            ellipse2.Width = 50;
            ellipse2.Fill = Brushes.Black;
            ellipseStackPanel.Children.Add(ellipse2);
            Ellipse ellipse3 = new Ellipse();
            ellipse3.Margin = new Thickness(10);
            ellipse3.Height = 50;
            ellipse3.Width = 50;
            ellipse3.Fill = Brushes.Black;
            ellipseStackPanel.Children.Add(ellipse3);
            borderStackPanel.Children.Add(ellipseStackPanel);

            myReflectedBorder.Child = borderStackPanel;

            // Create divider rectangle
            Rectangle dividerRectangle = new Rectangle();
            dividerRectangle.Height = 1;
            dividerRectangle.Fill = Brushes.Gray;
            dividerRectangle.HorizontalAlignment = HorizontalAlignment.Stretch;

            // Create the object to contain the reflection.
            Rectangle reflectionRectangle = new Rectangle();

            // Bind the height of the rectangle to the border height.
            Binding heightBinding = new Binding();
            heightBinding.ElementName = "ReflectedVisual";
            heightBinding.Path = new PropertyPath(Rectangle.HeightProperty);
            BindingOperations.SetBinding(reflectionRectangle, Rectangle.HeightProperty, heightBinding);

            // Bind the width of the rectangle to the border width.
            Binding widthBinding = new Binding();
            widthBinding.ElementName = "ReflectedVisual";
            widthBinding.Path = new PropertyPath(Rectangle.WidthProperty);
            BindingOperations.SetBinding(reflectionRectangle, Rectangle.WidthProperty, widthBinding);

            // Creates the reflection.
            VisualBrush myVisualBrush = new VisualBrush();
            myVisualBrush.Opacity = 0.75;
            myVisualBrush.Stretch = Stretch.None;
            Binding reflectionBinding = new Binding();
            reflectionBinding.ElementName = "ReflectedVisual";
            BindingOperations.SetBinding(myVisualBrush, VisualBrush.VisualProperty, reflectionBinding);

            ScaleTransform myScaleTransform = new ScaleTransform();
            myScaleTransform.ScaleX = 1;
            myScaleTransform.ScaleY = -1;
            TranslateTransform myTranslateTransform = new TranslateTransform();
            myTranslateTransform.Y = 1;

            TransformGroup myTransformGroup = new TransformGroup();
            myTransformGroup.Children.Add(myScaleTransform);
            myTransformGroup.Children.Add(myTranslateTransform);

            myVisualBrush.RelativeTransform = myTransformGroup;

            reflectionRectangle.Fill = myVisualBrush;

            // Create a gradient background for the border.
            GradientStop firstStop2 = new GradientStop();
            firstStop2.Offset = 0.0;
            Color c1 = new Color();
            c1.R = 0;
            c1.G = 0;
            c1.B = 0;
            c1.A = 255;
            firstStop2.Color = c1;
            GradientStop secondStop2 = new GradientStop();
            secondStop2.Offset = 0.5;
            Color c2 = new Color();
            c2.R = 0;
            c2.G = 0;
            c2.B = 0;
            c2.A = 51;
            firstStop2.Color = c2;
            GradientStop thirdStop = new GradientStop();
            thirdStop.Offset = 0.75;
            Color c3 = new Color();
            c3.R = 0;
            c3.G = 0;
            c3.B = 0;
            c3.A = 0;
            thirdStop.Color = c3;

            GradientStopCollection myGradientStopCollection2 = new GradientStopCollection();
            myGradientStopCollection2.Add(firstStop2);
            myGradientStopCollection2.Add(secondStop2);
            myGradientStopCollection2.Add(thirdStop);

            LinearGradientBrush myLinearGradientBrush2 = new LinearGradientBrush();
            myLinearGradientBrush2.StartPoint = new Point(0.5, 0);
            myLinearGradientBrush2.EndPoint = new Point(0.5, 1);
            myLinearGradientBrush2.GradientStops = myGradientStopCollection2;

            reflectionRectangle.OpacityMask = myLinearGradientBrush2;

            BlurBitmapEffect myBlurBitmapEffect = new BlurBitmapEffect();
            myBlurBitmapEffect.Radius = 1.5;

            reflectionRectangle.BitmapEffect = myBlurBitmapEffect;

            myStackPanel.Children.Add(myReflectedBorder);
            myStackPanel.Children.Add(dividerRectangle);
            myStackPanel.Children.Add(reflectionRectangle);
            this.Content = myStackPanel;
        }
        /*
    <Rectangle
      Height="{Binding Path=ActualHeight, ElementName=ReflectedVisual}"
      Width="{Binding Path=ActualWidth, ElementName=ReflectedVisual}">

      <Rectangle.OpacityMask>
        <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
          <GradientStop Color="#FF000000" Offset="0.0" />
          <GradientStop Color="#33000000" Offset="0.5" />
          <GradientStop Color="#00000000" Offset="0.75" />
        </LinearGradientBrush>
      </Rectangle.OpacityMask>

      <Rectangle.BitmapEffect>
        <BlurBitmapEffect Radius="1.5" />
      </Rectangle.BitmapEffect>

    </Rectangle>
  </StackPanel>
</Page>

*/
    }
}

Imports System.Windows
Imports System.Windows.Data
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Effects
Imports System.Windows.Media.Imaging
Imports System.IO
Imports System.Collections.ObjectModel
Imports System.Windows.Shapes
Namespace SDKSample
    Partial Public Class ReflectionExample
        Inherits Page
        Public Sub New()
            ' Create a name scope for the page.
            NameScope.SetNameScope(Me, New NameScope())

            Me.Background = Brushes.Black
            Dim myStackPanel As New StackPanel()
            myStackPanel.Margin = New Thickness(50)

            Dim myReflectedBorder As New Border()
            Me.RegisterName("ReflectedVisual", myReflectedBorder)

            ' Create a gradient background for the border.
            Dim firstStop As New GradientStop()
            firstStop.Offset = 0.0
            Dim firstStopColor As New Color()
            firstStopColor.R = 204
            firstStopColor.G = 204
            firstStopColor.B = 255
            firstStopColor.A = 255
            firstStop.Color = firstStopColor
            Dim secondStop As New GradientStop()
            secondStop.Offset = 1.0
            secondStop.Color = Colors.White

            Dim myGradientStopCollection As New GradientStopCollection()
            myGradientStopCollection.Add(firstStop)
            myGradientStopCollection.Add(secondStop)

            Dim myLinearGradientBrush As New LinearGradientBrush()
            myLinearGradientBrush.StartPoint = New Point(0, 0.5)
            myLinearGradientBrush.EndPoint = New Point(1, 0.5)
            myLinearGradientBrush.GradientStops = myGradientStopCollection

            myReflectedBorder.Background = myLinearGradientBrush

            ' Add contents to the border.
            Dim borderStackPanel As New StackPanel()
            borderStackPanel.Orientation = Orientation.Horizontal
            borderStackPanel.Margin = New Thickness(10)

            Dim myTextBlock As New TextBlock()
            myTextBlock.TextWrapping = TextWrapping.Wrap
            myTextBlock.Width = 200
            myTextBlock.Text = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit." & " Suspendisse vel ante. Donec luctus tortor sit amet est." & " Nullam pulvinar odio et wisi." & " Pellentesque quis magna. Sed pellentesque." & " Nulla euismod." & "Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas."

            borderStackPanel.Children.Add(myTextBlock)

            Dim ellipseStackPanel As New StackPanel()

            Dim ellipse1 As New Ellipse()
            ellipse1.Margin = New Thickness(10)
            ellipse1.Height = 50
            ellipse1.Width = 50
            ellipse1.Fill = Brushes.Black
            ellipseStackPanel.Children.Add(ellipse1)
            Dim ellipse2 As New Ellipse()
            ellipse2.Margin = New Thickness(10)
            ellipse2.Height = 50
            ellipse2.Width = 50
            ellipse2.Fill = Brushes.Black
            ellipseStackPanel.Children.Add(ellipse2)
            Dim ellipse3 As New Ellipse()
            ellipse3.Margin = New Thickness(10)
            ellipse3.Height = 50
            ellipse3.Width = 50
            ellipse3.Fill = Brushes.Black
            ellipseStackPanel.Children.Add(ellipse3)
            borderStackPanel.Children.Add(ellipseStackPanel)

            myReflectedBorder.Child = borderStackPanel

            ' Create divider rectangle
            Dim dividerRectangle As New Rectangle()
            dividerRectangle.Height = 1
            dividerRectangle.Fill = Brushes.Gray
            dividerRectangle.HorizontalAlignment = HorizontalAlignment.Stretch

            ' Create the object to contain the reflection.
            Dim reflectionRectangle As New Rectangle()

            ' Bind the height of the rectangle to the border height.
            Dim heightBinding As New Binding()
            heightBinding.ElementName = "ReflectedVisual"
            heightBinding.Path = New PropertyPath(Rectangle.HeightProperty)
            BindingOperations.SetBinding(reflectionRectangle, Rectangle.HeightProperty, heightBinding)

            ' Bind the width of the rectangle to the border width.
            Dim widthBinding As New Binding()
            widthBinding.ElementName = "ReflectedVisual"
            widthBinding.Path = New PropertyPath(Rectangle.WidthProperty)
            BindingOperations.SetBinding(reflectionRectangle, Rectangle.WidthProperty, widthBinding)

            ' Creates the reflection.
            Dim myVisualBrush As New VisualBrush()
            myVisualBrush.Opacity = 0.75
            myVisualBrush.Stretch = Stretch.None
            Dim reflectionBinding As New Binding()
            reflectionBinding.ElementName = "ReflectedVisual"
            BindingOperations.SetBinding(myVisualBrush, VisualBrush.VisualProperty, reflectionBinding)

            Dim myScaleTransform As New ScaleTransform()
            myScaleTransform.ScaleX = 1
            myScaleTransform.ScaleY = -1
            Dim myTranslateTransform As New TranslateTransform()
            myTranslateTransform.Y = 1

            Dim myTransformGroup As New TransformGroup()
            myTransformGroup.Children.Add(myScaleTransform)
            myTransformGroup.Children.Add(myTranslateTransform)

            myVisualBrush.RelativeTransform = myTransformGroup

            reflectionRectangle.Fill = myVisualBrush

            ' Create a gradient background for the border.
            Dim firstStop2 As New GradientStop()
            firstStop2.Offset = 0.0
            Dim c1 As New Color()
            c1.R = 0
            c1.G = 0
            c1.B = 0
            c1.A = 255
            firstStop2.Color = c1
            Dim secondStop2 As New GradientStop()
            secondStop2.Offset = 0.5
            Dim c2 As New Color()
            c2.R = 0
            c2.G = 0
            c2.B = 0
            c2.A = 51
            firstStop2.Color = c2
            Dim thirdStop As New GradientStop()
            thirdStop.Offset = 0.75
            Dim c3 As New Color()
            c3.R = 0
            c3.G = 0
            c3.B = 0
            c3.A = 0
            thirdStop.Color = c3

            Dim myGradientStopCollection2 As New GradientStopCollection()
            myGradientStopCollection2.Add(firstStop2)
            myGradientStopCollection2.Add(secondStop2)
            myGradientStopCollection2.Add(thirdStop)

            Dim myLinearGradientBrush2 As New LinearGradientBrush()
            myLinearGradientBrush2.StartPoint = New Point(0.5, 0)
            myLinearGradientBrush2.EndPoint = New Point(0.5, 1)
            myLinearGradientBrush2.GradientStops = myGradientStopCollection2

            reflectionRectangle.OpacityMask = myLinearGradientBrush2

            Dim myBlurBitmapEffect As New BlurBitmapEffect()
            myBlurBitmapEffect.Radius = 1.5

            reflectionRectangle.BitmapEffect = myBlurBitmapEffect

            myStackPanel.Children.Add(myReflectedBorder)
            myStackPanel.Children.Add(dividerRectangle)
            myStackPanel.Children.Add(reflectionRectangle)
            Me.Content = myStackPanel

        End Sub
    End Class
End Namespace
<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  Background="Black">


  <StackPanel Margin="50">

    <!-- The object to reflect. -->
    <Border Name="ReflectedVisual" Width="400">
      <Border.Background>
        <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
          <GradientStop Offset="0.0" Color="#CCCCFF" />
          <GradientStop Offset="1.0" Color="White" />
        </LinearGradientBrush>
      </Border.Background>
      <StackPanel Orientation="Horizontal" Margin="10">        
        <TextBlock TextWrapping="Wrap" Width="200" Margin="10">
          Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
          Suspendisse vel ante. Donec luctus tortor sit amet est.
          Nullam pulvinar odio et wisi.
          Pellentesque quis magna. Sed pellentesque.
          Nulla euismod.
          Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
        </TextBlock>
        <StackPanel>
          <Ellipse Margin="10" Height="50" Width="50" Fill="Black" />
          <Ellipse Margin="10" Height="50" Width="50" Fill="Black" />
          <Ellipse Margin="10" Height="50" Width="50" Fill="Black" />
        </StackPanel>
      </StackPanel>
    </Border>

    <Rectangle Height="1" Fill="Gray" HorizontalAlignment="Stretch" />

    <!-- The object to contain the reflection.-->
    <Rectangle 
      Height="{Binding Path=ActualHeight, ElementName=ReflectedVisual}" 
      Width="{Binding Path=ActualWidth, ElementName=ReflectedVisual}">
      <Rectangle.Fill>

        <!-- Creates the reflection. -->
        <VisualBrush 
          Opacity="0.75" Stretch="None"
          Visual="{Binding ElementName=ReflectedVisual}">
          <VisualBrush.RelativeTransform>

            <!-- Flip the reflection. -->
            <TransformGroup>
              <ScaleTransform ScaleX="1" ScaleY="-1" />
              <TranslateTransform  Y="1" />
            </TransformGroup>
          </VisualBrush.RelativeTransform>
        </VisualBrush>
      </Rectangle.Fill>

      <Rectangle.OpacityMask>
        <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
          <GradientStop Color="#FF000000" Offset="0.0" />
          <GradientStop Color="#33000000" Offset="0.5" />
          <GradientStop Color="#00000000" Offset="0.75" />
        </LinearGradientBrush>
      </Rectangle.OpacityMask>

      <Rectangle.BitmapEffect>
        <BlurBitmapEffect Radius="1.5" />
      </Rectangle.BitmapEffect>
      
    </Rectangle>
  </StackPanel>
</Page>

如需示範如何放大部分螢幕以及如何建立反映的其他範例,請參閱 VisualBrush 範例

TileBrush 功能

ImageBrushDrawingBrushVisualBrush 是 物件的類型 TileBrushTileBrush 物件可讓您充分掌控如何使用影像、繪圖或視覺效果繪製區域。 例如,您可以用構成圖樣的一系列影像並排顯示來繪製區域,而不是只以單一自動縮放的影像來繪製區域。

TileBrush有三個主要元件:內容、磚和輸出區域。

TileBrush components
具有單一並排顯示之 TileBrush 的元件

Components of a tiled TileBrush
具有多個並排顯示之 TileBrush 的元件

如需物件並排功能 TileBrush 的詳細資訊,請參閱 TileBrush 概觀

另請參閱