note 71181 added to ref.image
| From: | jason at tectonic dot co dot za | Date: | Wed, 15 Nov 2006 11:26:07 +0000 |
| Subject: | note 71181 added to ref.image | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-119747@lists.php.net to get a copy of this message | ||
function chromagradient(&$image, $startgradient, $endgradient, $chromacolor) {
$testcolor=imagecolorallocate($image,30,50,10);
$width=imagesx($image);
$height=imagesy($image);
$endindex=imagecolorsforindex($image,$endgradient);
$startindex=imagecolorsforindex($image,$startgradient);
$reddiff=$startindex['red']-$endindex['red'];
$greendiff=$startindex['green']-$endindex['green'];
$bluediff=$startindex['blue']-$endindex['blue'];
$found=false;
$y=0;
while ((!$found) && ($y<$height)) {
$x=0;
while(($x<$width) && (!$found)) {
$col=imagecolorat($image,$x,$y);
if ($col==$chromacolor) {
$startpoint=$y;
$found=true;
break;
}
$x++;
}
$y++;
}
$found=false;
$y=$height;
while ((!$found) && ($y>0)) {
for ($x=0;$x<$width;$x++) {
$col=imagecolorat($image,$x,$y);
if ($col==$chromacolor) {
$endpoint=$y;
$found=true;
break;
}
}
$y--;
}
$gheight=$endpoint-$startpoint;
for ($x=0;$x<$width;$x++) {
for ($y=$startpoint;$y<$endpoint;$y++) {
$newblue=$startindex['blue'] - floor(($y-$startpoint)*$bluediff/($gheight));
$newgreen=$startindex['green'] - floor(($y-$startpoint)*$greendiff/($gheight));
$newred=$startindex['red'] - floor(($y-$startpoint)*$reddiff/($gheight));
$replacementcol=imagecolorallocate($image, $newred, $newgreen, $newblue);
$col=imagecolorat($image,$x,$y);
if ($col==$chromacolor) {
imagesetpixel($image,$x,$y,$replacementcol);
}
}
}
}
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Server IP: 66.163.161.117
Probable Submitter: 168.209.98.43 (proxied: 196.36.199.4)
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Manual Page -- http://www.php.net/manual/en/ref.image.php
Edit -- https://master.php.net/note/edit/71181
Del: integrated -- https://master.php.net/note/delete/71181/integrated
Del: useless -- https://master.php.net/note/delete/71181/useless
Del: bad code -- https://master.php.net/note/delete/71181/bad+code
Del: spam -- https://master.php.net/note/delete/71181/spam
Del: non-english -- https://master.php.net/note/delete/71181/non-english
Del: in docs -- https://master.php.net/note/delete/71181/in+docs
Del: other reasons-- https://master.php.net/note/delete/71181
Reject -- https://master.php.net/note/reject/71181
Search -- https://master.php.net/manage/user-notes.php