通过

如何：使用图像绘制区域

  • 项目

此示例演示如何使用 ImageBrush 类来绘制带有图像的区域。 ImageBrush 显示由其 ImageSource 属性指定的单个图像。

示例

下面的示例通过使用 ImageBrush 绘制按钮的 Background。



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>

默认情况下，ImageBrush 拉伸其图像以完全填充您绘制的区域。 在上面的示例中，拉伸图像以填充按钮，可能扭曲图像。 可以通过将 TileBrush 的 Stretch 属性设置为 Uniform 或 UniformToFill 来控制此行为，这样会使画笔保留图像的纵横比。

如果设置 ImageBrush 的 Viewport 和 TileMode 属性，则可以创建重复的图案。 下面的示例通过使用从图像创建的图案来绘制按钮。



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>

有关 ImageBrush 类的更多信息，请参见使用图像、绘图和 Visual 进行绘制。

此代码示例摘自一个为 ImageBrush 类提供的更大的示例。 有关完整示例，请参见 ImageBrush Sample（ImageBrush 示例）。

请参见

概念

使用图像、绘图和 Visual 进行绘制