Cómo: Pintar un área con una imagen

En este ejemplo se muestra cómo utilizar la clase ImageBrush para pintar una área con una imagen. Un ImageBrush muestra una imagen única, que se especifica mediante su propiedad ImageSource.

Ejemplo

En el ejemplo siguiente se pinta el fondo (Background) de un botón mediante ImageBrush.

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

Namespace Microsoft.Samples.Graphics.UsingImageBrush

    Public Class PaintingWithImagesExample
        Inherits Page

        Public Sub New()
            Background = Brushes.White
            Dim mainPanel As New StackPanel()
            mainPanel.Margin = New Thickness(20.0)

            ' Create a button.
            Dim berriesButton As New Button()
            With berriesButton
                .Foreground = Brushes.White
                .FontWeight = FontWeights.Bold
                Dim sizeConverter As New FontSizeConverter()
                .FontSize = CType(sizeConverter.ConvertFromString("16pt"), Double)
                .FontFamily = New FontFamily("Verdana")
                .Content = "Berries"
                .Padding = New Thickness(20.0)
                .HorizontalAlignment = HorizontalAlignment.Left
            End With

            ' Create an ImageBrush.
            Dim berriesBrush As New ImageBrush()
            berriesBrush.ImageSource = New BitmapImage(New Uri("sampleImages\berries.jpg", UriKind.Relative))

            ' Use the brush to paint the button's background.
            berriesButton.Background = berriesBrush

            mainPanel.Children.Add(berriesButton)
            Me.Content = mainPanel
        End Sub
    End Class
End Namespace

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

namespace Microsoft.Samples.Graphics.UsingImageBrush
{

    public class PaintingWithImagesExample : Page
    {

        public PaintingWithImagesExample()
        {
            Background = Brushes.White;
            StackPanel mainPanel = new StackPanel();
            mainPanel.Margin = new Thickness(20.0);

            // Create a button.
            Button berriesButton = new Button();
            berriesButton.Foreground = Brushes.White;
            berriesButton.FontWeight = FontWeights.Bold;
            FontSizeConverter sizeConverter = new FontSizeConverter();
            berriesButton.FontSize = (Double)sizeConverter.ConvertFromString("16pt");
            berriesButton.FontFamily = new FontFamily("Verdana");
            berriesButton.Content = "Berries";
            berriesButton.Padding = new Thickness(20.0);
            berriesButton.HorizontalAlignment = HorizontalAlignment.Left;

            // Create an ImageBrush.
            ImageBrush berriesBrush = new ImageBrush();
            berriesBrush.ImageSource =
                new BitmapImage(
                    new Uri(@"sampleImages\berries.jpg", UriKind.Relative)
                );

            // Use the brush to paint the button's background.
            berriesButton.Background = berriesBrush;

            mainPanel.Children.Add(berriesButton);
            this.Content = mainPanel;
        }
    }
}

<!-- This example shows how to use an ImageBrush to paint shapes and controls. -->
<Page  
  xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" 
  Background="White">

  <StackPanel Margin="20">

    <!-- Sets the button's Background property with an 
         ImageBrush. The resulting
         button has an image as its background. -->
    <Button
     Foreground="White" FontWeight="Bold"
     FontSize="16pt" FontFamily="Verdana" 
     Content="Berries"
     Padding="20" 
     HorizontalAlignment="Left">
      <Button.Background>
        <ImageBrush ImageSource="sampleImages\berries.jpg" />
      </Button.Background>
    </Button>
  </StackPanel>
</Page>

De manera predeterminada, ImageBrush ajusta su imagen hasta rellenar completamente el área que se está pintando. En el ejemplo anterior, la imagen se ajusta hasta rellenar el botón, lo que puede distorsionar la imagen. Puede controlar este comportamiento estableciendo la propiedad Stretch de TileBrush en Uniform o UniformToFill, para que el pincel conserve la relación de aspecto de la imagen.

Si establece las propiedades Viewport y TileMode de ImageBrush, puede crear un patrón que se repite. En el ejemplo siguiente se pinta un botón mediante un patrón creado a partir de una imagen.

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

Namespace Microsoft.Samples.Graphics.UsingImageBrush

    Public Class TiledImageBrushExample
        Inherits Page

        Public Sub New()
            Background = Brushes.White
            Dim mainPanel As New StackPanel()
            mainPanel.Margin = New Thickness(20.0)

            ' Create a button.
            Dim berriesButton As New Button()
            With berriesButton
                .Foreground = Brushes.White
                .FontWeight = FontWeights.Bold
                Dim sizeConverter As New FontSizeConverter()
                .FontSize = CType(sizeConverter.ConvertFromString("16pt"), Double)
                .FontFamily = New FontFamily("Verdana")
                .Content = "Berries"
                .Padding = New Thickness(20.0)
                .HorizontalAlignment = HorizontalAlignment.Left
            End With

            ' Create an ImageBrush.
            Dim berriesBrush As New ImageBrush()
            berriesBrush.ImageSource = New BitmapImage(New Uri("sampleImages\berries.jpg", UriKind.Relative))

            ' Set the ImageBrush's Viewport and TileMode
            ' so that it produces a pattern from
            ' the image.
            berriesBrush.Viewport = New Rect(0, 0, 0.5, 0.5)
            berriesBrush.TileMode = TileMode.FlipXY

            ' Use the brush to paint the button's background.
            berriesButton.Background = berriesBrush

            mainPanel.Children.Add(berriesButton)
            Me.Content = mainPanel
        End Sub
    End Class
End Namespace

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

namespace Microsoft.Samples.Graphics.UsingImageBrush
{

    public class TiledImageBrushExample : Page
    {

        public TiledImageBrushExample()
        {
            Background = Brushes.White;
            StackPanel mainPanel = new StackPanel();
            mainPanel.Margin = new Thickness(20.0);

            // Create a button.
            Button berriesButton = new Button();
            berriesButton.Foreground = Brushes.White;
            berriesButton.FontWeight = FontWeights.Bold;
            FontSizeConverter sizeConverter = new FontSizeConverter();
            berriesButton.FontSize = (Double)sizeConverter.ConvertFromString("16pt");
            berriesButton.FontFamily = new FontFamily("Verdana");
            berriesButton.Content = "Berries";
            berriesButton.Padding = new Thickness(20.0);
            berriesButton.HorizontalAlignment = HorizontalAlignment.Left;

            // Create an ImageBrush.
            ImageBrush berriesBrush = new ImageBrush();
            berriesBrush.ImageSource =
                new BitmapImage(
                    new Uri(@"sampleImages\berries.jpg", UriKind.Relative)
                );

            // Set the ImageBrush's Viewport and TileMode
            // so that it produces a pattern from
            // the image.
            berriesBrush.Viewport = new Rect(0,0,0.5,0.5);
            berriesBrush.TileMode = TileMode.FlipXY;

            // Use the brush to paint the button's background.
            berriesButton.Background = berriesBrush;

            mainPanel.Children.Add(berriesButton);
            this.Content = mainPanel;
        }
    }
}

<!-- This example shows how to use an ImageBrush to paint shapes and controls. -->
<Page  
  xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" 
  Background="White">

  <StackPanel Margin="20">

    <!-- Sets the button's Background property with an 
         ImageBrush. The resulting
         button has an image as its background. -->
    <Button
     Foreground="White" FontWeight="Bold"
     FontSize="16pt" FontFamily="Verdana" 
     Content="Berries"
     Padding="20" 
     HorizontalAlignment="Left">
      <Button.Background>

        <!-- The ImageBrush's Viewport and TileMode
             are set to produce a pattern from the
             image. -->
        <ImageBrush 
          Viewport="0,0,0.5,0.5" 
          TileMode="FlipXY"
          ImageSource="sampleImages\berries.jpg" />
      </Button.Background>
    </Button>
  </StackPanel>
</Page>

Para obtener más información sobre la clase ImageBrush, vea Pintar con imágenes, dibujos y elementos visuales.

Este ejemplo de código forma parte de un ejemplo más extenso proporcionado para la clase ImageBrush. Para obtener el ejemplo completo, vea ImageBrush Sample.

Vea también

Conceptos

Pintar con imágenes, dibujos y elementos visuales