RotateFlipType enumeration

Specifies the direction of the rotation of an image and the axis it is flipped about.

A rotation is clockwise, in steps of 90 degrees, and happens before the flip. Several combinations give the same result, so the members have the same values: for example flipping about the vertical axis after a 180 degree rotation is the same as flipping about the horizontal axis with no rotation.

Member Value Description
RotateNoneFlipNone 0 No rotation and no flip.
Rotate90FlipNone 1 A rotation by 90 degrees and no flip.
Rotate180FlipNone 2 A rotation by 180 degrees and no flip.
Rotate270FlipNone 3 A rotation by 270 degrees and no flip.
RotateNoneFlipX 4 No rotation, then a horizontal flip.
Rotate90FlipX 5 A rotation by 90 degrees, then a horizontal flip.
Rotate180FlipX 6 A rotation by 180 degrees, then a horizontal flip.
Rotate270FlipX 7 A rotation by 270 degrees, then a horizontal flip.
RotateNoneFlipY 6 No rotation, then a vertical flip. Same as Rotate180FlipX.
Rotate90FlipY 7 A rotation by 90 degrees, then a vertical flip. Same as Rotate270FlipX.
Rotate180FlipY 4 A rotation by 180 degrees, then a vertical flip. Same as RotateNoneFlipX.
Rotate270FlipY 5 A rotation by 270 degrees, then a vertical flip. Same as Rotate90FlipX.
RotateNoneFlipXY 2 No rotation, then a horizontal and a vertical flip. Same as Rotate180FlipNone.
Rotate90FlipXY 3 A rotation by 90 degrees, then a horizontal and a vertical flip. Same as Rotate270FlipNone.
Rotate180FlipXY 0 A rotation by 180 degrees, then a horizontal and a vertical flip. Same as RotateNoneFlipNone.
Rotate270FlipXY 1 A rotation by 270 degrees, then a horizontal and a vertical flip. Same as Rotate90FlipNone.

Used by

Example 

Dim user As GdiPlusUser = GdiPlusUser()
Dim bmp As Bitmap = Bitmap(4!, 2!)
bmp.Pixel(0, 0) = Color(CColor.Red)
Debug.Print bmp.Width, bmp.Height

bmp.RotateFlip Rotate90FlipNone
Debug.Print bmp.Width, bmp.Height
Debug.Print Hex$(bmp.Pixel(1, 0).Value)
' Output:
' 4             2
' 2             4
' FFFF0000

A rotation by 90 degrees swaps the width and the height. The red pixel at the upper left corner moves to the upper right corner.

See Also