Most recent edit on 2007-07-24 16:08:23 by GasperKozak

Additions:
If you set $bgColor to null, a transparent color will be detected. If the image is not transparent, fully transparent alpha-color will be allocated with allocateColorAlpha()∞. If you save such an image to a format that doesn't support transparency (like jpeg), the background color will be undefined.

Deletions:
If you set $bgColor to null, a transparent color will be detected. If the image is not transparent, fully transparent alpha-color will be allocated with allocateColorAlpha()∞. If you save such an image to a format that doesn't support transparency (like png), the background color will be undefined.

Oldest known version of this page was edited on 2007-03-03 11:47:33 by GasperKozak []

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wiImage::rotate()

See: List of operations

Signature

wiImage::rotate($angle, $bgColor = null, $ignoreTransparent = true)

Parameters

$angle (int): angle to rotate. In degrees, clockwise.
$bgColor (int): index of the color that will fill the empty space. Leave null to auto-detect or allocate a transparent color.
$ignoreTransparent (bool): set to true to ignore transparent colors.

result (wiTrueColorImage): rotated image

Description

This method will rotate an image with a given angle using imagerotate()∞.

If you set $bgColor to null, a transparent color will be detected. If the image is not transparent, fully transparent alpha-color will be allocated with allocateColorAlpha()∞. If you save such an image to a format that doesn't support transparency (like png), the background color will be undefined.

Notes

Currently, there seems to be a bug with (alpha)transparent images rotated for more than 45 and less than 315 degress. This bug seems to be reported and fixed in CVS∞ in Nov 2006, but I still have this issue on PHP 5.2.

Examples

$img = wiImage::load('/path/to/an/image.png');

// rotate and save

$img->rotate(45)->save('rotated.png');