Rotates a GdPicture image with a specific angle keeping the originals width and height of the picture.

public GdPictureStatus RotateAnglePreserveDimensions(
    int ImageID, 
    Single Angle
);

Public Function RotateAnglePreserveDimensions(
    ByVal ImageID As Integer, 
    ByVal Angle As Single
) As GdPictureStatus

A member of the GdPictureStatus enumeration.