note 90350 added to function.imagerotate
| From: | dave dot richards at gmail dot com | Date: | Fri, 17 Apr 2009 11:47:12 +0000 |
| Subject: | note 90350 added to function.imagerotate | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-153425@lists.php.net to get a copy of this message | ||
There is a slight mistake in the previous post by Kae Cyphet.
When setting the pixels of the new image the co-ordinates have to occasionally use the width ($wid)
and height ($hei). These values must be reduced by 1 as the co-ordinates start at 0 (Not 1) so they
only go up to $wid - 1 and $hei - 1 (Not $wid and $hei).
Here's an example of the first function to show this:
<?php
function rotate_right90($im)
{
$wid = imagesx($im);
$hei = imagesy($im);
$im2 = imagecreatetruecolor($hei,$wid);
for($i = 0;$i < $wid; $i++)
{
for($j = 0;$j < $hei; $j++)
{
$ref = imagecolorat($im,$i,$j);
imagesetpixel($im2,($hei - 1) - $j,$i,$ref);
}
}
return $im2;
}
?>
Other than that very useful functions!
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