ImageGear Professional v18 for Mac
Rotating an Image
| ImageGear Professional v18.1 > User Guide > Getting Started > Developing an Application > Image Processing > Rotating an Image |
The Processing menu contains a group of Rotate 90 and Rotate Any items.
Using IG_IP_rotate_multiple_90(), you can rotate your image on 90, 180, or 270 degrees. The code sample below demonstrates a 90 degree rotation. The required angle of rotation should be specified by one of IG_ROTATE_ constants.
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- (IBAction)mnuProcessingRotate90:(id)sender { |
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Although the visible result of this function call is similar to that of IG_dspl_orientation_set() described in Image Orientation, the significant difference between them is that all functions of the ImageGear Image Processing group (IG_IP_ ) do change image's contents, while the ImageGear Image Display functions (IG_dspl_ ) do not. |
IG_IP_rotate_any_angle() allows you to rotate an image to any angle. In the sample below, the image will be rotated 123.5 degrees.
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| - (IBAction)mnuProcessingRotateAny:(id)sender { if(IG_image_is_valid(hIGear)) { IG_IP_rotate_any_angle(hIGear, 123.5, IG_ROTATE_CLIP); // Update main view [mainScrollViewOutlet setNeedsDisplay:YES]; } } |
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Below you can see the image that is rotated on 123.5 degrees:
