CanvasImageSource Class

Derives from Windows.UI.Xaml.Media.Imaging.SurfaceImageSource and extends it to know about Canvas types. Most apps should use CanvasControl instead of directly managing their own CanvasImageSource.

Inheritance Hierarchy

System.Object
Windows.UI.Xaml.Media.Imaging.SurfaceImageSource
Microsoft.Graphics.Canvas.UI.Xaml.CanvasImageSource

Namespace: Microsoft.Graphics.Canvas.UI.Xaml
Assembly: Microsoft.Graphics.Canvas (in Microsoft.Graphics.Canvas.dll) Version: 0.0.0.0

Syntax

Copy

public sealed class CanvasImageSource : SurfaceImageSource, 
	ICanvasResourceCreatorWithDpi, ICanvasResourceCreator

The CanvasImageSource type exposes the following members.

Constructors

	Name	Description
	CanvasImageSource(ICanvasResourceCreatorWithDpi, Size)	Initializes a new instance of the CanvasImageSource class.
	CanvasImageSource(ICanvasResourceCreatorWithDpi, Single, Single)	Initializes a new instance of the CanvasImageSource class.
	CanvasImageSource(ICanvasResourceCreator, Single, Single, Single)	Initializes a new instance of the CanvasImageSource class.
	CanvasImageSource(ICanvasResourceCreator, Single, Single, Single, CanvasAlphaMode)	Initializes a new instance of the CanvasImageSource class.

Top

Properties

	Name	Description
	AlphaMode	Returns the alpha mode for this image source that was passed in to the constructor.
	Device	Gets the device used by this image source.
	Dpi	Gets the dots-per-inch (DPI) of this image source.
	Size	Gets the size of the image source, in device independent pixels (DIPs).
	SizeInPixels	Gets the size of the image source, in pixels.

Top

Methods

	Name	Description
	ConvertDipsToPixels	Converts units from device independent pixels (DIPs) to physical pixels based on the DPI of this image source.
	ConvertPixelsToDips	Converts units from physical pixels to device independent pixels (DIPs) based on the DPI of this image source.
	CreateDrawingSession(Color)	Returns a new drawing session for redrawing the entire image source.
	CreateDrawingSession(Color, Rect)	Returns a new drawing session for updating a region of the image source.
	Recreate	Recreates the underlying image source.

Top

Examples

Copy

var imageSource = new CanvasImageSource(canvasDevice, width, height, dpi);

imageControl.Source = imageSource;

using (var ds = imageSource.CreateDrawingSession(Colors.Black))
{
    // drawing code
}

Reference

Microsoft.Graphics.Canvas.UI.Xaml Namespace