Procedura: inserire un disegno in un'area

Questo esempio spiega come inserire un disegno in un'area. Per disegnare un'area con un disegno, utilizzare un DrawingBrush oggetto e uno o più Drawing oggetti. Nell'esempio seguente viene utilizzato un DrawingBrush oggetto per disegnare un oggetto con un disegno di due puntini di sospensione.

Esempio

<!-- Demonstrates the use of DrawingBrush. -->
<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Background="White">
  <StackPanel Margin="20">

    <Rectangle Width="150" Height="150" Stroke="Black" StrokeThickness="1">
      <Rectangle.Fill>
        <DrawingBrush>
          <DrawingBrush.Drawing>
            <GeometryDrawing Brush="MediumBlue">
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
                  <EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Pen>
                <Pen Thickness="10">
                  <Pen.Brush>
                    <LinearGradientBrush>
                      <GradientStop Offset="0.0" Color="Black" />
                      <GradientStop Offset="1.0" Color="Gray" />
                    </LinearGradientBrush>
                  </Pen.Brush>
                </Pen>
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingBrush.Drawing>
        </DrawingBrush>
      </Rectangle.Fill>
    </Rectangle>
  </StackPanel>
</Page>

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

namespace Microsoft.Samples.DrawingBrushExamples
{
    /// <summary>
    /// Paints a Rectangle element with a DrawingBrush.
    /// </summary>
    public class DrawingBrushExample : Page
    {
        public DrawingBrushExample()
        {
            Background = Brushes.White;
            StackPanel mainPanel = new StackPanel();

            // Create a drawing of two ellipses.
            GeometryDrawing aDrawing = new GeometryDrawing();

            // Use geometries to describe two overlapping ellipses.
            EllipseGeometry ellipse1 = new EllipseGeometry();
            ellipse1.RadiusX = 20;
            ellipse1.RadiusY = 45;
            ellipse1.Center = new Point(50, 50);
            EllipseGeometry ellipse2 = new EllipseGeometry();
            ellipse2.RadiusX = 45;
            ellipse2.RadiusY = 20;
            ellipse2.Center = new Point(50, 50);
            GeometryGroup ellipses = new GeometryGroup();
            ellipses.Children.Add(ellipse1);
            ellipses.Children.Add(ellipse2);

            // Add the geometry to the drawing.
            aDrawing.Geometry = ellipses;

            // Specify the drawing's fill.
            aDrawing.Brush = Brushes.Blue;

            // Specify the drawing's stroke.
            Pen stroke = new Pen();
            stroke.Thickness = 10.0;
            stroke.Brush = new LinearGradientBrush(
                Colors.Black, Colors.Gray, new Point(0, 0), new Point(1, 1));
            aDrawing.Pen = stroke;

            // Create a DrawingBrush
            DrawingBrush myDrawingBrush = new DrawingBrush();
            myDrawingBrush.Drawing = aDrawing;

            // Create a Rectangle element.
            Rectangle aRectangle = new Rectangle();
            aRectangle.Width = 150;
            aRectangle.Height = 150;
            aRectangle.Stroke = Brushes.Black;
            aRectangle.StrokeThickness = 1.0;

            // Use the DrawingBrush to paint the rectangle's
            // background.
            aRectangle.Fill = myDrawingBrush;

            mainPanel.Children.Add(aRectangle);

            this.Content = mainPanel;
        }
    }
}

Imports System.Windows.Media.Animation


Namespace Microsoft.Samples.DrawingBrushExamples
    ''' <summary>
    ''' Paints a Rectangle element with a DrawingBrush.
    ''' </summary>
    Public Class DrawingBrushExample
        Inherits Page
        Public Sub New()
            Background = Brushes.White
            Dim mainPanel As New StackPanel()

            ' Create a drawing of two ellipses.
            Dim aDrawing As New GeometryDrawing()

            ' Use geometries to describe two overlapping ellipses.
            Dim ellipse1 As New EllipseGeometry()
            ellipse1.RadiusX = 20
            ellipse1.RadiusY = 45
            ellipse1.Center = New Point(50, 50)
            Dim ellipse2 As New EllipseGeometry()
            ellipse2.RadiusX = 45
            ellipse2.RadiusY = 20
            ellipse2.Center = New Point(50, 50)
            Dim ellipses As New GeometryGroup()
            ellipses.Children.Add(ellipse1)
            ellipses.Children.Add(ellipse2)

            ' Add the geometry to the drawing.
            aDrawing.Geometry = ellipses

            ' Specify the drawing's fill.
            aDrawing.Brush = Brushes.Blue

            ' Specify the drawing's stroke.
            Dim stroke As New Pen()
            stroke.Thickness = 10.0
            stroke.Brush = New LinearGradientBrush(Colors.Black, Colors.Gray, New Point(0, 0), New Point(1, 1))
            aDrawing.Pen = stroke

            ' Create a DrawingBrush
            Dim myDrawingBrush As New DrawingBrush()
            myDrawingBrush.Drawing = aDrawing

            ' Create a Rectangle element.
            Dim aRectangle As New Rectangle()
            aRectangle.Width = 150
            aRectangle.Height = 150
            aRectangle.Stroke = Brushes.Black
            aRectangle.StrokeThickness = 1.0

            ' Use the DrawingBrush to paint the rectangle's
            ' background.
            aRectangle.Fill = myDrawingBrush

            mainPanel.Children.Add(aRectangle)

            Me.Content = mainPanel

        End Sub
    End Class
End Namespace

L'immagine seguente illustra l'output dell'esempio.

Il centro della forma è bianco per i motivi descritti in Controllare il riempimento di una forma composta.

Impostando le proprietà e TileMode di Viewport un DrawingBrush oggetto, è possibile creare un modello ripetuto. L'esempio seguente disegna un oggetto con un motivo creato da un disegno di due ellissi.

<!-- Demonstrates the use of DrawingBrush. -->
<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Background="White">
  <StackPanel Margin="20">

    <Rectangle Width="150" Height="150" Stroke="Black" StrokeThickness="1">
      <Rectangle.Fill>
        <DrawingBrush Viewport="0,0,0.25,0.25" TileMode="Tile">
          <DrawingBrush.Drawing>
            <GeometryDrawing Brush="MediumBlue">
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
                  <EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Pen>
                <Pen Thickness="10">
                  <Pen.Brush>
                    <LinearGradientBrush>
                      <GradientStop Offset="0.0" Color="Black" />
                      <GradientStop Offset="1.0" Color="Gray" />
                    </LinearGradientBrush>
                  </Pen.Brush>
                </Pen>
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingBrush.Drawing>
        </DrawingBrush>
      </Rectangle.Fill>
    </Rectangle>
  </StackPanel>
</Page>

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

namespace Microsoft.Samples.DrawingBrushExamples
{

    /// <summary>
    /// Paints a Rectangle element with a tiled DrawingBrush.
    /// </summary>
    public class TiledDrawingBrushExample : Page
    {

        public TiledDrawingBrushExample()
        {
            Background = Brushes.White;
            StackPanel mainPanel = new StackPanel();

            // Create a drawing of two ellipses.
            GeometryDrawing aDrawing = new GeometryDrawing();

            // Use geometries to describe two overlapping ellipses.
            EllipseGeometry ellipse1 = new EllipseGeometry();
            ellipse1.RadiusX = 20;
            ellipse1.RadiusY = 45;
            ellipse1.Center = new Point(50, 50);
            EllipseGeometry ellipse2 = new EllipseGeometry();
            ellipse2.RadiusX = 45;
            ellipse2.RadiusY = 20;
            ellipse2.Center = new Point(50, 50);
            GeometryGroup ellipses = new GeometryGroup();
            ellipses.Children.Add(ellipse1);
            ellipses.Children.Add(ellipse2);

            // Add the geometry to the drawing.
            aDrawing.Geometry = ellipses;

            // Specify the drawing's fill.
            aDrawing.Brush = Brushes.Blue;

            // Specify the drawing's stroke.
            Pen stroke = new Pen();
            stroke.Thickness = 10.0;
            stroke.Brush = new LinearGradientBrush(
                Colors.Black, Colors.Gray, new Point(0, 0), new Point(1, 1));
            aDrawing.Pen = stroke;

            // Create a DrawingBrush
            DrawingBrush myDrawingBrush = new DrawingBrush();
            myDrawingBrush.Drawing = aDrawing;

            // Set the DrawingBrush's Viewport and TileMode
            // properties so that it generates a pattern.
            myDrawingBrush.Viewport = new Rect(0, 0, 0.25, 0.25);
            myDrawingBrush.TileMode = TileMode.Tile;

            // Create a Rectangle element.
            Rectangle aRectangle = new Rectangle();
            aRectangle.Width = 150;
            aRectangle.Height = 150;
            aRectangle.Stroke = Brushes.Black;
            aRectangle.StrokeThickness = 1.0;

            // Use the DrawingBrush to paint the rectangle's
            // background.
            aRectangle.Fill = myDrawingBrush;

            mainPanel.Children.Add(aRectangle);

            this.Content = mainPanel;
        }
    }
}

Imports System.Windows.Media.Animation


Namespace Microsoft.Samples.DrawingBrushExamples

    ''' <summary>
    ''' Paints a Rectangle element with a tiled DrawingBrush.
    ''' </summary>
    Public Class TiledDrawingBrushExample
        Inherits Page

        Public Sub New()
            Background = Brushes.White
            Dim mainPanel As New StackPanel()

            ' Create a drawing of two ellipses.
            Dim aDrawing As New GeometryDrawing()

            ' Use geometries to describe two overlapping ellipses.
            Dim ellipse1 As New EllipseGeometry()
            ellipse1.RadiusX = 20
            ellipse1.RadiusY = 45
            ellipse1.Center = New Point(50, 50)
            Dim ellipse2 As New EllipseGeometry()
            ellipse2.RadiusX = 45
            ellipse2.RadiusY = 20
            ellipse2.Center = New Point(50, 50)
            Dim ellipses As New GeometryGroup()
            ellipses.Children.Add(ellipse1)
            ellipses.Children.Add(ellipse2)

            ' Add the geometry to the drawing.
            aDrawing.Geometry = ellipses

            ' Specify the drawing's fill.
            aDrawing.Brush = Brushes.Blue

            ' Specify the drawing's stroke.
            Dim stroke As New Pen()
            stroke.Thickness = 10.0
            stroke.Brush = New LinearGradientBrush(Colors.Black, Colors.Gray, New Point(0, 0), New Point(1, 1))
            aDrawing.Pen = stroke

            ' Create a DrawingBrush
            Dim myDrawingBrush As New DrawingBrush()
            myDrawingBrush.Drawing = aDrawing

            ' Set the DrawingBrush's Viewport and TileMode
            ' properties so that it generates a pattern.
            myDrawingBrush.Viewport = New Rect(0, 0, 0.25, 0.25)
            myDrawingBrush.TileMode = TileMode.Tile

            ' Create a Rectangle element.
            Dim aRectangle As New Rectangle()
            aRectangle.Width = 150
            aRectangle.Height = 150
            aRectangle.Stroke = Brushes.Black
            aRectangle.StrokeThickness = 1.0

            ' Use the DrawingBrush to paint the rectangle's
            ' background.
            aRectangle.Fill = myDrawingBrush

            mainPanel.Children.Add(aRectangle)

            Me.Content = mainPanel

        End Sub

    End Class
End Namespace

La figura seguente mostra l'output affiancato DrawingBrush .

Per altre informazioni sui pennelli da disegno, vedere Disegnare con oggetti Image, Drawing e Visual. Per altre informazioni sugli oggetti, vedere Cenni preliminari sugli Drawing oggetti disegno.