Flipping an Image
Bitmap lets you flip an image vertically or horizontally. To produce a flipped image using Bitmap, you can set the TransformOptions property of the FlipRotator class. The TransformOption property can be set through TransformOptions enumeration.
The image below shows a horizontally-flipped image.
The following code illustrates flipping an image vertically or horizontally on button clicks. This example uses the sample created in the Quick start section.
vbnet
Private Sub ApplyTransform(t As BaseTransform)
Dim newBitmap = bitmap.Transform(t)
bitmap.Dispose()
bitmap = newBitmap
selection = New RectF(1.0F, 1.0F)
UpdateImage()
End Sub
'Event to flip the image vertically on button click
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ApplyTransform(New FlipRotator(TransformOptions.FlipVertical))
End Sub
'Event to flip the image horizontally on button click
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
ApplyTransform(New FlipRotator(TransformOptions.FlipHorizontal))
End Sub
csharp
void ApplyTransform(BaseTransform t)
{
var newBitmap = bitmap.Transform(t);
bitmap.Dispose();
bitmap = newBitmap;
selection = new RectF(1f, 1f);
UpdateImage();
}
//Event to flip the image vertically on button click
private void button3_Click(object sender, EventArgs e)
{
ApplyTransform(new FlipRotator(TransformOptions.FlipVertical));
}
//Event to flip the image horizontally on button click
private void button4_Click(object sender, EventArgs e)
{
ApplyTransform(new FlipRotator(TransformOptions.FlipHorizontal));
}