HOW TO：將 BitmapSource 物件鏈結在一起
更新：2007 年 11 月
本範例示範如何藉由將多個 BitmapSource 衍生的物件鏈結在一起，以便對影像來源上套用各種效果。
下列範例使用鏈結以翻轉及變更影像來源的像素格式。
範例
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml">
<Page.Resources>
<!-- This resource defines a BitmapImage with a source and a
DecodePixelWidth of 200. This property is set to the same value
as the desired width of the image to save on memory use. This
BitmapImage is used as the base for the other BitmapSource resources. -->
<BitmapImage x:Key="masterImage" DecodePixelWidth="200"
UriSource="C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Forest.jpg"/>
<!-- This TransformedBitmap uses the BitmapImage defined above and flips
it 90 degrees. -->
<TransformedBitmap x:Key="rotatedImage" Source="{StaticResource masterImage}">
<TransformedBitmap.Transform>
<RotateTransform Angle="90" />
</TransformedBitmap.Transform>
</TransformedBitmap>
<!-- This FormatConvertedBitmap uses the TransformedBitmap defined above and
changes the format to Gray32Float (grayscale). -->
<FormatConvertedBitmap x:Key="convertFormatImage"
Source="{StaticResource rotatedImage}"
DestinationFormat="Gray32Float" />
</Page.Resources>
<StackPanel>
<!-- Apply the "convertFormatImage" resource defined above to this image.
The resource is a combination of all three BitmapSource objects which
renders this image with DecodePixelWidth set to 200, fliped 90 degrees
and converted to grayscale. -->
<Image Width="200" Source="{StaticResource convertFormatImage}" />
</StackPanel>
</Page>
'This is a list of commonly used namespaces for a pane.
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Namespace SDKSample
Class ChainedBitmapSourcesExample
Inherits Page
Public Sub New()
'/// Create a BitmapImage and set it's DecodePixelWidth to 200. Use /////
'/// this BitmapImage as a source for other BitmapSource objects. /////
Dim myBitmapImage As New BitmapImage()
' BitmapSource objects like BitmapImage can only have their properties
' changed within a BeginInit/EndInit block.
myBitmapImage.BeginInit()
myBitmapImage.UriSource = New Uri("sampleImages/WaterLilies.jpg", UriKind.Relative)
' To save significant application memory, set the DecodePixelWidth or
' DecodePixelHeight of the BitmapImage value of the image source to the desired
' height or width of the rendered image. If you don't do this, the application will
' cache the image as though it were rendered as its normal size rather then just
' the size that is displayed.
' Note: In order to preserve aspect ratio, set DecodePixelWidth
' or DecodePixelHeight but not both.
myBitmapImage.DecodePixelWidth = 200
myBitmapImage.EndInit()
'///////////////// Create a BitmapSource that Rotates the image //////////////////////
' Use the BitmapImage created above as the source for a new BitmapSource object
' that will be scaled to a different size. Create a new BitmapSource by
' scaling the original one.
' Note: New BitmapSource does not cache. It is always pulled when required.
' Create the new BitmapSource that will be used to scale the size of the source.
Dim myRotatedBitmapSource As New TransformedBitmap()
' BitmapSource objects like TransformedBitmap can only have their properties
' changed within a BeginInit/EndInit block.
myRotatedBitmapSource.BeginInit()
' Use the BitmapSource object defined above as the source for this BitmapSource.
' This creates a "chain" of BitmapSource objects which essentially inherit from each other.
myRotatedBitmapSource.Source = myBitmapImage
' Multiply the size of the X and Y axis of the source by 3.
myRotatedBitmapSource.Transform = New RotateTransform(90)
myRotatedBitmapSource.EndInit()
' Create a new BitmapSource using a different format than the original one.
Dim newFormatedBitmapSource As New FormatConvertedBitmap()
' BitmapSource objects like FormatConvertedBitmap can only have their properties
' changed within a BeginInit/EndInit block.
newFormatedBitmapSource.BeginInit()
newFormatedBitmapSource.Source = myRotatedBitmapSource
newFormatedBitmapSource.DestinationFormat = PixelFormats.Gray32Float
newFormatedBitmapSource.EndInit()
' Create Image Element
Dim myImage As New Image()
myImage.Width = 200
'set image source
myImage.Source = newFormatedBitmapSource
' Add Image to the UI
Dim myStackPanel As New StackPanel()
myStackPanel.Children.Add(myImage)
Me.Content = myStackPanel
End Sub 'New
Public Sub PageLoaded(ByVal sender As Object, ByVal args As RoutedEventArgs)
End Sub 'PageLoaded
End Class 'ChainedBitmapSourcesExample
End Namespace
//This is a list of commonly used namespaces for a pane.
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace SDKSample
{
public partial class ChainedBitmapSourcesExample : Page
{
public ChainedBitmapSourcesExample()
{
///// Create a BitmapImage and set it's DecodePixelWidth to 200. Use /////
///// this BitmapImage as a source for other BitmapSource objects. /////
BitmapImage myBitmapImage = new BitmapImage();
// BitmapSource objects like BitmapImage can only have their properties
// changed within a BeginInit/EndInit block.
myBitmapImage.BeginInit();
myBitmapImage.UriSource = new Uri("sampleImages/WaterLilies.jpg",UriKind.Relative);
// To save significant application memory, set the DecodePixelWidth or
// DecodePixelHeight of the BitmapImage value of the image source to the desired
// height or width of the rendered image. If you don't do this, the application will
// cache the image as though it were rendered as its normal size rather then just
// the size that is displayed.
// Note: In order to preserve aspect ratio, set DecodePixelWidth
// or DecodePixelHeight but not both.
myBitmapImage.DecodePixelWidth = 200;
myBitmapImage.EndInit();
/////////////////// Create a BitmapSource that Rotates the image //////////////////////
// Use the BitmapImage created above as the source for a new BitmapSource object
// that will be scaled to a different size. Create a new BitmapSource by
// scaling the original one.
// Note: New BitmapSource does not cache. It is always pulled when required.
// Create the new BitmapSource that will be used to scale the size of the source.
TransformedBitmap myRotatedBitmapSource = new TransformedBitmap();
// BitmapSource objects like TransformedBitmap can only have their properties
// changed within a BeginInit/EndInit block.
myRotatedBitmapSource.BeginInit();
// Use the BitmapSource object defined above as the source for this BitmapSource.
// This creates a "chain" of BitmapSource objects which essentially inherit from each other.
myRotatedBitmapSource.Source = myBitmapImage;
// Multiply the size of the X and Y axis of the source by 3.
myRotatedBitmapSource.Transform = new RotateTransform(90);
myRotatedBitmapSource.EndInit();
// Create a new BitmapSource using a different format than the original one.
FormatConvertedBitmap newFormatedBitmapSource = new FormatConvertedBitmap();
// BitmapSource objects like FormatConvertedBitmap can only have their properties
// changed within a BeginInit/EndInit block.
newFormatedBitmapSource.BeginInit();
newFormatedBitmapSource.Source = myRotatedBitmapSource;
newFormatedBitmapSource.DestinationFormat = PixelFormats.Gray32Float;
newFormatedBitmapSource.EndInit();
// Create Image Element
Image myImage = new Image();
myImage.Width = 200;
//set image source
myImage.Source = newFormatedBitmapSource;
// Add Image to the UI
StackPanel myStackPanel = new StackPanel();
myStackPanel.Children.Add(myImage);
this.Content = myStackPanel;
}
public void PageLoaded(object sender, RoutedEventArgs args)
{
}
}
}