Defines an annotation picture along with its transparency information.
Syntax
| Visual Basic (Usage) |  Copy Code |
|---|
Dim instance As AnnPicture
|
| XAML Object Element Usage | |
|---|
<AnnPicture .../> |
| XAML Object Element Usage | |
|---|
<AnnPicture .../> |
Example
For XAML example, refer to AnnGroupObject.
This example creates an image that has a blue ellipse inside a red rectangle.
| Visual Basic | Copy Code |
|---|
Private Sub AnnPicture_AnnPicture(ByVal dc As DrawingContext)
Dim pic As AnnPicture = Nothing
Dim dv As DrawingVisual = New DrawingVisual()
Using dvc As DrawingContext = dv.RenderOpen()
dvc.DrawRectangle(Brushes.Red, Nothing, New Rect(0, 0, 100, 100))
dvc.DrawEllipse(Brushes.Red, Nothing, New System.Windows.Point(50, 50), 100, 100)
dvc.Close()
Dim btmp As RenderTargetBitmap = New RenderTargetBitmap(100, 100, 96, 96, PixelFormats.Pbgra32)
btmp.Render(dv)
pic = New AnnPicture(btmp)
End Using
If Not pic Is Nothing AndAlso Not pic.Image Is Nothing Then
Dim rc As Rect = New Rect(10, 10, pic.Image.Width, pic.Image.Height)
dc.DrawImage(pic.Image, rc)
rc.Offset(0, pic.Image.Height + 10)
pic.TransparentMode = AnnPictureTransparentMode.UseColor
pic.TransparentColor = Colors.Blue
dc.DrawImage(pic.Image, rc)
rc.Offset(0, pic.Image.Height + 10)
pic.TransparentMode = AnnPictureTransparentMode.TopLeftPixel
dc.DrawImage(pic.Image, rc)
End If
End Sub |
| C# | Copy Code |
|---|
private void AnnPicture_AnnPicture(DrawingContext dc)
{
AnnPicture pic = null;
DrawingVisual dv = new DrawingVisual();
using(DrawingContext dvc = dv.RenderOpen())
//Bitmap btmp = new Bitmap(100, 100, PixelFormat.Format32bppArgb))
{
dvc.DrawRectangle(Brushes.Red, null, new Rect(0, 0, 100, 100));
dvc.DrawEllipse(Brushes.Red, null, new Point(50, 50), 100, 100);
dvc.Close();
RenderTargetBitmap btmp = new RenderTargetBitmap(100, 100, 96, 96, PixelFormats.Pbgra32);
btmp.Render(dv);
// initialize a new AnnPicture class for this image
pic = new AnnPicture(btmp);
}
if(pic != null && pic.Image != null)
{
// draw the picture with no transparency
Rect rc = new Rect(10, 10, pic.Image.Width, pic.Image.Height);
dc.DrawImage(pic.Image, rc);
// draw the picture without the ellipse (make transparent color = blue)
rc.Offset(0, pic.Image.Height + 10);
pic.TransparentMode = AnnPictureTransparentMode.UseColor;
pic.TransparentColor = Colors.Blue;
dc.DrawImage(pic.Image, rc);
// draw the picture without the rectangle (use the top left pixel as the transparent color)
rc.Offset(0, pic.Image.Height + 10);
pic.TransparentMode = AnnPictureTransparentMode.TopLeftPixel;
dc.DrawImage(pic.Image, rc);
}
} |
Inheritance Hierarchy
Requirements
Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Vista, and Windows Server 2003 family
See Also
