DrawingGroup.ClipGeometry プロパティ

定義

この DrawingGroup のクリップ領域を取得または設定します。Gets or sets the clip region of this DrawingGroup.

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

プロパティ値

この Geometry をクリップする際に使用する DrawingGroupThe Geometry that is used to clip this DrawingGroup. 既定値は、null です。The default is null.

この例では、 Drawingのクリップ領域を定義する方法を示します。This example shows how to define a clip region for a Drawing.

を使用して、 Drawingのクリップを定義します。 DrawingGroupUse a DrawingGroup to define a clip for a Drawing. クラスは、独自のクリップ領域Drawingを定義できる唯一のオブジェクト型です。 DrawingGroupThe DrawingGroup class is the only type of Drawing object that enables you to define your own clip region.

Geometry使用してクリップを記述し、それをClipGeometry DrawingGroupオブジェクトのプロパティに適用します。Use a Geometry to describe the clip and apply it to the ClipGeometry property of the DrawingGroup object.

この図は、 DrawingGroup楕円のクリップが適用される前と後を示しています。The illustration shows the DrawingGroup before and after the elliptical clip is applied.

クリップ領域が定義されている図面グループDrawingGroup with a defined clip region

次の例ではDrawingGroup 、を使用ClipGeometryしてGeometryDrawing 、を複数のオブジェクトに適用します。The following example uses a DrawingGroup to apply a ClipGeometry to several GeometryDrawing objects.

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

namespace SDKSample
{
    /// <summary>
    /// Shows how to define a clip region for a DrawingGroup.
    /// </summary>
    public class ClipExample : Page
    {
        public ClipExample()
        {

            //
            // Create several GeometryDrawing objects.
            //

            // Create a rectangle.
            GeometryDrawing drawing1 = new GeometryDrawing(
                Brushes.Pink,
                null, 
                new RectangleGeometry(new Rect(0,0,50,85))
                );

            //
            // Create a polygon.
            //
            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 drawing2 = new GeometryDrawing(
                    Brushes.Lime,
                    new Pen(Brushes.Black, 10),
                    pGeometry
                );

            //
            // Create a circle.
            //
            GeometryDrawing drawing3 = new GeometryDrawing(
                    Brushes.Lime,
                    new Pen(Brushes.Black, 2),
                    new EllipseGeometry(new Point(10, 10), 5, 5)
                );

            // Create the DrawingGroup and add the
            // geometry drawings.
            DrawingGroup aDrawingGroup = new DrawingGroup();
            aDrawingGroup.Children.Add(drawing1);
            aDrawingGroup.Children.Add(drawing2);
            aDrawingGroup.Children.Add(drawing3);

            //
            // Create an EllipseGeometry and use it to
            // clip the DrawingGroup.
            //
            EllipseGeometry clipGeometry = 
                new EllipseGeometry(new Point(25,50), 25, 50);
            aDrawingGroup.ClipGeometry = clipGeometry;

            // Use an Image control and a DrawingImage to
            // display the drawing.
            DrawingImage aDrawingImage = new DrawingImage(aDrawingGroup);

            // Freeze the DrawingImage for performance benefits.
            aDrawingImage.Freeze();

            Image anImage = new Image();
            anImage.Source = aDrawingImage;
            anImage.Stretch = Stretch.None;
            anImage.HorizontalAlignment = HorizontalAlignment.Left;

            // Create a border around the images and add it to the
            // page.
            Border imageBorder = new Border();
            imageBorder.BorderBrush = Brushes.Gray;
            imageBorder.BorderThickness = new Thickness(1);
            imageBorder.VerticalAlignment = VerticalAlignment.Top;
            imageBorder.HorizontalAlignment = HorizontalAlignment.Left;
            imageBorder.Margin = new Thickness(20);
            imageBorder.Child = anImage;

            this.Background = Brushes.White;
            this.Margin = new Thickness(20);
            this.Content = imageBorder;
        }
    }
}

<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"
  Background="White" Margin="20">

  <Border BorderBrush="Gray" BorderThickness="1" 
    HorizontalAlignment="Left" VerticalAlignment="Top"
    Margin="20">
    <Image Stretch="None" HorizontalAlignment="Left">
      <Image.Source>
        <DrawingImage PresentationOptions:Freeze="True">
          <DrawingImage.Drawing>

            <!-- A DrawingGeometry with an elliptical clip region. -->
            <DrawingGroup>
              <GeometryDrawing Brush="Pink">
                <GeometryDrawing.Geometry>
                  <RectangleGeometry Rect="0,0,50,85" />
                </GeometryDrawing.Geometry>
              </GeometryDrawing>
              <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.ClipGeometry>
                <EllipseGeometry Center="25,50" RadiusX="25" RadiusY="50" />
              </DrawingGroup.ClipGeometry>
            </DrawingGroup>
          </DrawingImage.Drawing>
        </DrawingImage>
      </Image.Source>
    </Image>
  </Border>


</Page>

注釈

ジオメトリ外の描画は、 DrawingGroup描画時にからクリップされます。Drawings outside the geometry are clipped from the DrawingGroup when it is rendered. ジオメトリが四角形である必要はありません。たとえば、を使用EllipseGeometryして楕円図形にクリップすることができます。The geometry does not have to be rectangular; for example, you can use an EllipseGeometry to clip to an elliptical shape.

DrawingGroup操作は次の順序で適用されます。DrawingGroup operations are applied in the following order:

  1. OpacityMask

  2. Opacity

  3. BitmapEffect

  4. ClipGeometry

  5. GuidelineSet

  6. Transform

依存プロパティ情報Dependency Property Information

識別子フィールドIdentifier field ClipGeometryProperty
メタデータプロパティがに設定されるtrueMetadata properties set to true NoneNone

適用対象