RotateEx Method

Description:

Rotates an image about its center through the angle indicated by Angle. (Angle must be expressed in degrees, such as 45.0 to rotate 45 degrees.) RotateMode is examined to determined whether to clip the image or resize the bitmap. Set the IGProcessingCtl Control.BackColor Property to the color that you would like to display in the background that was previously covered by the image before it was rotated. The Interpolation parameter controls what type of interpolation, if any, is used for rotation.

This method processes all image channels, including Alpha channel and Extra channels, if they exist.

For highest quality, bilinear interpolation is recommended, especially if the rotation angle is small (less than 5 degrees) and/or the image will be rotated multiple times (not recommended). Bicubic interpolation can be used to achieve a slightly sharper appearance.

Syntax:

      RotateEx (ByVal pPage As IGPage, ByVal Angle As Double, ByVal 
RotationMode As enumIGRotationModes, ByVal Interpolation As 
enumIGInterpolations)

Parameters:

Name	Description
pPage	Reference to IGPage Object.
Angle	Set to a positive or negative value for angle of rotation.
RotationMode	The value can be either: IG_ROTATE_CLIP - clip the rotated image to keep the image bitmap the same size or IG_ROTATE_EXPAND - expand the size of the bitmap if necessary to retain the entire rotated image.
Interpolation	The value can be: IG_INTERPOLATION_NONE - don't use interpolation IG_INTERPOLATION_BILINEAR - use bilinear interpolation IG_INTERPOLATION_BICUBIC - use bicubic interpolation

Return Value:

N/A

Bits Per Pixel:

1, 4, 8, 9-16-bit gray level, 24, 32

Sample:

Image Processing and Effects