HOW TO：建立反映
更新：2007 年 11 月
本範例說明如何使用 VisualBrush 建立反映。由於 VisualBrush 可以顯示現有的圖形，您可以用它來產生有趣的視覺效果，例如反射和放大。
範例
下列範例會使用 VisualBrush 來建立包含幾個項目之 Border 的反映。下圖顯示的是這個範例產生的輸出。
反映的 Visual 物件
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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>
*/
}
}
<Page
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://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>
如需完整範例，包括說明如何放大螢幕某些區域以及如何建立反映的範例，請參閱 VisualBrush 範例。