function image_rotate

Rotates an image by the given number of degrees.

Parameters

$image: An image object returned by image_load().

$degrees: The number of (clockwise) degrees to rotate the image.

$background: An hexadecimal integer specifying the background color to use for the uncovered area of the image after the rotation. E.g. 0x000000 for black, 0xff00ff for magenta, and 0xffffff for white. For images that support transparency, this will default to transparent. Otherwise it will be white.

Return value

TRUE on success, FALSE on failure.:

See also

image_load()

image_gd_rotate()

Related topics

File

core/includes/image.inc, line 337

API for manipulating images.

Code

function image_rotate(stdClass $image, $degrees, $background = NULL) {
  // Standardize $degrees to be an integer if possible. This avoids strange
  // rounding errors when rotating multiples of 90 degrees. For example a
  // 100x100 image when rotated 90.0 (float) degrees may result in an image
  // dimension of 99x100 pixels. See https://bugs.php.net/bug.php?id=65148.
  if (strcmp((int) $degrees, $degrees) === 0) {
    $degrees = (int) $degrees;
  }
  else {
    $degrees = (float) $degrees;
  }
  // Likewise, negative rotations can sometimes have rounding errors, convert
  // to a positive number before passing to the toolkit. This bug is also
  // reported at https://bugs.php.net/bug.php?id=65148 (same as above).
  while ($degrees < 0) {
    $degrees = 360 + $degrees;
  }
  // Reduce greater than 360 degrees just for good measure.
  while ($degrees >= 360) {
    $degrees = 360 - $degrees;
  }

  return image_toolkit_invoke('rotate', $image, array($degrees, $background));
}