note 26085 added to ref.image

In the gd-library there is no function to rotate an image by a given angle. So here it is: <?php function imagerotate(&$img, $ang, $bg=FALSE, $width=FALSE, $height=FALSE, $bench=FALSE) { /* (c) 2002 Jens Gottfried Function to rotate an image */ if($bench) $time = microtime(); if(!$bg) $bg = imagecolorallocate($img, 255,255,255); // size of the image $src_w = imagesx($img); $src_h = imagesy($img); // reduce angle while($ang > 180) $ang = $ang-360; while($ang < -180) $ang = $ang+360; // angles > 90° if($ang > 90) { imagerotate($img, 90, $bg, $src_h,$src_w); $ang = $ang - 90; } elseif($ang < -90) { imagerotate($img, -90, $bg, $src_h,$src_w); $ang = $ang + 90; } // size of the image $src_w = imagesx($img); $src_h = imagesy($img); if($ang != 0) { // deg->rad if($ang > 0) $wrad = deg2rad($ang); else $wrad = deg2rad((-1*$ang)); $sin = sin($wrad); if($sin < 0) $sin*=-1; $cos = cos($wrad); if($cos < 0) $cos*=-1; // size of rotated image $dst_w = (int) ( $sin*$src_h + $cos*$src_w ); $dst_h = (int) ( $cos*$src_h + $sin*$src_w ); if($dst_w < 0) $dst_w *= -1; if($dst_h < 0) $dst_h *= -1; $scale_x = (int) ( $width/$dst_w ); $scale_y = (int) ( $height/$dst_h ); // create image and set backgound-color $dst_img = imagecreatetruecolor($dst_w, $dst_h); imagefill($dst_img, 0,0, $bg); for($i=0; $i<$src_h; $i++) { for($j=0; $j<$src_w; $j++) { // get new position of pixel if($ang > 0) { $dst_x = (int) ( $sin*($src_h-$i) + $cos*$j ); $dst_y = (int) ( $sin*$j + $cos*$i ); } else { $dst_x = (int) ( $sin*$i + $cos*$j ); $dst_y = (int) ( $sin*($src_w-$j) + $cos*$i ); } if($scale_x != 0) $dst_x = $dst_x*$scale_x; if($scale_y != 0) $dst_y = $dst_y*$scale_y; // get color of actual pixel $col = imagecolorat($img, $j, $i); // draw pixel (draws 2 pixel at once to avoid gaps in rotated picture) imagefilledrectangle($dst_img, $dst_x,$dst_y, $dst_x+1,$dst_y, $col); } } // resampling needed if($width!==FALSE && $height!==FALSE && ($width!=$dst_w || $height!=$dst_h)) { $new_img = imagecreatetruecolor($width, $height); imagefill($new_img, 0,0, $bg); imagecopyresampled($new_img, $dst_img, 0,0,0,0, $width,$height, $dst_w,$dst_h); imagedestroy($dst_img); $img = $new_img; } else $img = $dst_img; } // no need to rotate but resample elseif($width!==FALSE && $height!==FALSE && ($width!=$dst_w || $height!=$dst_h)) { $dst_img = imagecreatetruecolor($width, $height); imagefill($dst_img, 0,0, $bg); imagecopyresampled($dst_img, $img, 0,0,0,0, $width, $height, $src_w, $src_h); $img = $dst_img; } // nothing needs to be done else $img = $dst_img; if(!bench) return; // show benchmark info elseif($bench == "IMAGE") { list($usec, $sec) = explode(" ",microtime()); $etime = (float)$usec + (float)$sec; list($usec, $sec) = explode(" ",$time); $etime -= (float)$usec + (float)$sec; $etime = substr($etime, 0, 7); imagefilledrectangle($img, 0,0, 42,12, imagecolorallocate($img, 255,255,255)); imagestring($img, 2, 0,0, $etime, imagecolorallocate($img, 0,0,0)); } elseif($bench == "STRING") { list($usec, $sec) = explode(" ",microtime()); $etime = (float)$usec + (float)$sec; list($usec, $sec) = explode(" ",$time); $etime -= (float)$usec + (float)$sec; return $etime; } } ?> imagerotate($img, $ang[, $bg[, $width, $height[, $bench]]]); $img - is the image you want to rotate. NOTE: Its passed by reference, so maybe, you need to make a copy yourself. $ang - is the angle $bg (optional) - is the index of the background-color (Default: white) $width and $height (optional) - the Image will be resampled to this size when its not already the same. Use always both! $bench (optional) "STRING" returns the time needed to execute the function. "IMAGE" will put a small field with the time on the image. On my testing system it takes ~1 sec to rotate an image (250x200px). ~2 seconds when the angle is > 90°. !This function only works on jpeg images! Have fun Juggler -- http://www.php.net/manual/en/ref.image.php http://master.php.net/manage/user-notes.php?action=edit+26085 http://master.php.net/manage/user-notes.php?action=delete+26085 http://master.php.net/manage/user-notes.php?action=reject+26085