共用方式為


DrawingGroup.BitmapEffect 屬性

定義

取得或設定要套用至這個 DrawingGroupBitmapEffect

public:
 property System::Windows::Media::Effects::BitmapEffect ^ BitmapEffect { System::Windows::Media::Effects::BitmapEffect ^ get(); void set(System::Windows::Media::Effects::BitmapEffect ^ value); };
public System.Windows.Media.Effects.BitmapEffect BitmapEffect { get; set; }
member this.BitmapEffect : System.Windows.Media.Effects.BitmapEffect with get, set
Public Property BitmapEffect As BitmapEffect

屬性值

BitmapEffect

要套用至這個 DrawingGroupBitmapEffect。 預設為 null

範例

此範例示範如何將 套用 BitmapEffect 至繪圖。 BitmapEffect使用 來模糊或浮凸,或將其他視覺效果套用至轉譯的內容。

只有 DrawingGroup 物件支援點陣圖效果。 若要將點陣圖效果套用至另一種類型的 Drawing 物件,請將它新增至 DrawingGroup ,並設定 BitmapEffect 物件的 屬性 DrawingGroup

注意

Windows Presentation Foundation點陣圖效果會轉譯軟體。 套用 BitmapEffect 的任何物件也會在軟體中轉譯。 避免在大型視覺效果或動畫中使用 BitmapEffect ,因為此案例可能會導致系統效能降低。

下列範例使用 DrawingGroup 將 套用至數 GeometryDrawingBlurBitmapEffect 物件。

下圖顯示此範例的輸出。

具有 BlurBitmapEffect 的 DrawingGroup

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Effects;

namespace SDKSample 
{

    /// <summary>
    /// This example creates two DrawingGroup objects,
    /// one with a bitmap effect and one without.
    /// </summary>
    public class BitmapEffectExample : Page
    {
        public BitmapEffectExample()
        {

            //
            // Create a DrawingGroup
            // that has no BitmapEffect
            //
            PathFigure pLineFigure = new PathFigure();
            pLineFigure.StartPoint = new Point(25, 25);
            PolyLineSegment pLineSegment = new PolyLineSegment();
            pLineSegment.Points.Add(new Point(0,50));
            pLineSegment.Points.Add(new Point(25, 75));
            pLineSegment.Points.Add(new Point(50, 50));
            pLineSegment.Points.Add(new Point(25, 25));
            pLineSegment.Points.Add(new Point(25, 0));
            pLineFigure.Segments.Add(pLineSegment);
            PathGeometry pGeometry = new PathGeometry();
            pGeometry.Figures.Add(pLineFigure);
          
            GeometryDrawing drawing1 = new GeometryDrawing(
                    Brushes.Lime, 
                    new Pen(Brushes.Black, 10),
                    pGeometry
                );

            GeometryDrawing drawing2 = new GeometryDrawing(
                    Brushes.Lime,
                    new Pen(Brushes.Black, 2),
                    new EllipseGeometry(new Point(10,10), 5, 5)
                );
            
            // Create a DrawingGroup
            DrawingGroup drawingGroupWithoutBitmapEffect = new DrawingGroup();
            drawingGroupWithoutBitmapEffect.Children.Add(drawing1);
            drawingGroupWithoutBitmapEffect.Children.Add(drawing2);

            // Use an Image control and a DrawingImage to
            // display the drawing.
            DrawingImage drawingImage01 = new DrawingImage(drawingGroupWithoutBitmapEffect);
            
            // Freeze the DrawingImage for performance benefits.
            drawingImage01.Freeze();

            Image image01 = new Image();
            image01.Source = drawingImage01;
            image01.Stretch = Stretch.None;
            image01.HorizontalAlignment = HorizontalAlignment.Left;

            //
            // Create another DrawingGroup and apply 
            // a blur effect to it.
            //

            // Create a clone of the first DrawingGroup.
            DrawingGroup drawingGroupWithBitmapEffect = 
                drawingGroupWithoutBitmapEffect.Clone();

            // Create a blur effect.
            BlurBitmapEffect blurEffect = new BlurBitmapEffect();
            blurEffect.Radius = 3.0;

            // Apply it to the drawing group.
            drawingGroupWithBitmapEffect.BitmapEffect = blurEffect;

            // Use another Image control and DrawingImage
            // to display the drawing.
            DrawingImage drawingImage02 = new DrawingImage(drawingGroupWithBitmapEffect);
            
            // Freeze the DrawingImage for performance benefits.
            drawingImage02.Freeze();

            Image image02 = new Image();
            image02.Source = drawingImage02;
            image02.Stretch = Stretch.None;
            image02.HorizontalAlignment = HorizontalAlignment.Left;

            // Create borders around the images and add them to the
            // page.
            Border border01 = new Border();
            border01.BorderBrush = Brushes.Gray;
            border01.BorderThickness = new Thickness(1);
            border01.VerticalAlignment = VerticalAlignment.Top;
            border01.Margin = new Thickness(10);
            border01.Child = image01;

            Border border02 = new Border();
            border02.BorderBrush = Brushes.Gray;
            border02.BorderThickness = new Thickness(1);
            border02.VerticalAlignment = VerticalAlignment.Top;
            border02.Margin = new Thickness(50,10,10,10);
            border02.Child = image02;

            StackPanel mainPanel = new StackPanel();
            mainPanel.Orientation = Orientation.Horizontal;
            mainPanel.HorizontalAlignment = HorizontalAlignment.Left;
            mainPanel.VerticalAlignment = VerticalAlignment.Top;
            mainPanel.Children.Add(border01);
            mainPanel.Children.Add(border02);

            //
            // Use a DrawingBrush to create a checkered background for the page.
            //
            GeometryDrawing backgroundSquareDrawing = 
                new GeometryDrawing(
                    Brushes.White,
                    null,
                    new RectangleGeometry(new Rect(0,0,1,1)));
            GeometryGroup twoRectangles = new GeometryGroup();
            twoRectangles.Children.Add(new RectangleGeometry(new Rect(0,0,0.5,0.5)));
            twoRectangles.Children.Add(new RectangleGeometry(new Rect(0.5,0.5,0.5,0.5)));
            SolidColorBrush squaresBrush = 
                new SolidColorBrush(Color.FromArgb(102,204,204,204));
            squaresBrush.Opacity = 0.4;
            GeometryDrawing checkerDrawing = 
                new GeometryDrawing(
                    squaresBrush,
                    null,
                    twoRectangles);
            DrawingGroup checkerDrawings = new DrawingGroup();
            checkerDrawings.Children.Add(backgroundSquareDrawing);
            checkerDrawings.Children.Add(checkerDrawing);
            DrawingBrush checkerBrush = new DrawingBrush(checkerDrawings);
            checkerBrush.Viewport = new Rect(0,0,10,10);
            checkerBrush.ViewportUnits = BrushMappingMode.Absolute;
            checkerBrush.TileMode = TileMode.Tile;
            checkerBrush.Freeze();

            this.Background = checkerBrush;
            this.Content = mainPanel;
        }
    }
}
<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:PresentationOptions="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="PresentationOptions">

  <StackPanel Margin="20" Orientation="Horizontal" 
    HorizontalAlignment="Left" VerticalAlignment="Top">

    <!-- Shows the DrawingGroup without the blur effect. -->
    <Border BorderBrush="Gray" BorderThickness="1"  Margin="10"
      VerticalAlignment="Top">
      <Image Stretch="None" HorizontalAlignment="Left">
        <Image.Source>
          <DrawingImage PresentationOptions:Freeze="True">
            <DrawingImage.Drawing>
              <DrawingGroup>
                <GeometryDrawing Brush="Lime" Geometry="M 25,25 L 0,50 25,75 50,50 25,25 25,0">
                  <GeometryDrawing.Pen>
                    <Pen Thickness="10" Brush="Black" />
                  </GeometryDrawing.Pen>
                </GeometryDrawing>
                <GeometryDrawing Brush="Lime">
                  <GeometryDrawing.Geometry>
                    <EllipseGeometry Center="10,10" RadiusX="5" RadiusY="5" />
                  </GeometryDrawing.Geometry>
                  <GeometryDrawing.Pen>
                    <Pen Thickness="2" Brush="Black" />
                  </GeometryDrawing.Pen>
                </GeometryDrawing>
              </DrawingGroup>
            </DrawingImage.Drawing>
          </DrawingImage>
        </Image.Source>
      </Image>
    </Border>

    <Border BorderBrush="Gray" BorderThickness="1" Margin="50,10,10,10"
      VerticalAlignment="Top">
      <Image Stretch="None" HorizontalAlignment="Left">
        <Image.Source>
          <DrawingImage PresentationOptions:Freeze="True">
            <DrawingImage.Drawing>

              <!-- The drawing group, with a BlurBitmapEffect. -->
              <DrawingGroup>
                <GeometryDrawing Brush="Lime" Geometry="M 25,25 L 0,50 25,75 50,50 25,25 25,0">
                  <GeometryDrawing.Pen>
                    <Pen Thickness="10" Brush="Black" />
                  </GeometryDrawing.Pen>
                </GeometryDrawing>
                <GeometryDrawing Brush="Lime">
                  <GeometryDrawing.Geometry>
                    <EllipseGeometry Center="10,10" RadiusX="5" RadiusY="5" />
                  </GeometryDrawing.Geometry>
                  <GeometryDrawing.Pen>
                    <Pen Thickness="2" Brush="Black" />
                  </GeometryDrawing.Pen>
                </GeometryDrawing>

                <DrawingGroup.BitmapEffect>
                  <BlurBitmapEffect Radius="5"  />
                </DrawingGroup.BitmapEffect>
              </DrawingGroup>
            </DrawingImage.Drawing>
          </DrawingImage>
        </Image.Source>
      </Image>
    </Border>
  </StackPanel>

  <Page.Background>

    <!-- Creates a checkered background. -->
    <DrawingBrush Viewport="0,0,10,10" ViewportUnits="Absolute" TileMode="Tile"
      PresentationOptions:Freeze="True">
      <DrawingBrush.Drawing>
        <DrawingGroup>
          <GeometryDrawing Brush="White">
            <GeometryDrawing.Geometry>
              <RectangleGeometry Rect="0 0 1 1"/>
            </GeometryDrawing.Geometry>
          </GeometryDrawing>
          <GeometryDrawing Brush="#66CCCCCC">
            <GeometryDrawing.Geometry>
              <GeometryGroup>
                <RectangleGeometry Rect="0 0 0.5 0.5" />
                <RectangleGeometry Rect="0.5 0.5 0.5 0.5"/>
              </GeometryGroup>
            </GeometryDrawing.Geometry>
          </GeometryDrawing>
        </DrawingGroup>
      </DrawingBrush.Drawing>
    </DrawingBrush>
  </Page.Background>
</Page>

備註

如需點陣圖效果及其運作方式的詳細資訊,請參閱 點陣圖效果概觀

DrawingGroup 作業會依下列順序套用:

相依性屬性資訊

識別碼欄位 BitmapEffectProperty
中繼資料屬性設定為 true

適用於