This function computes the new width and height of the image after it has been rotated using IG_IP_rotate_any_angle, IG_IP_rotate_any_angle_bkgrnd, or IG_IP_rotate_any_angle_ex functions.
Declaration:
 Copy Code |
|
|---|---|
AT_ERRCOUNT ACCUAPI IG_IP_rotate_compute_size( HIGEAR hIGear, DOUBLE angle, AT_MODE rotate_mode, LPAT_DIMENSION lpWidth, LPAT_DIMENSION lpHeight ); |
|
Arguments:
| hIGear | HIGEAR handle of image of which to compute size. |
| angle | Angle by which to rotate the image, in degrees. Positive values result in clockwise rotation; negative values result in counter-clockwise rotation. |
| rotate_mode | Rotation mode. Specifies whether the image should be clipped or expanded. See enumIGRotationModes for possible values. |
| lpWidth | Pointer in which is returned the new width of the bitmap after rotation. |
| lpHeight | Pointer in which is returned the new height of the bitmap after rotation. |
Return Value:
Returns 0 if successful. Otherwise, returns the number of ImageGear errors that occurred during this function call.Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
None
Example:
| Copy Code |
|
|---|---|
HIGEAR hIGear; // HIGEAR handle of the image AT_ERRCOUNT nErrcount; // Count of errs on stack upon ret from func AT_DIMENSION nWidth, nHeight; // New height and width of image // Load image file "picture.bmp" from working directory nErrcount = IG_load_file("picture.bmp", &hIGear); if(nErrcount == 0) { nErrcount = IG_IP_rotate_compute_size(hIGear, 45., IG_ROTATE_EXPAND, &nWidth, &nHeight); // ... // Destroy the image IG_image_delete(hIGear); } |
|
Remarks:
You may use this function before rotation in IG_ROTATE_EXPAND mode to determine the dimensions of the new rotated image. This way, you can estimate the amount of memory that will be needed to hold the new image.