I honestly have no clue, I'm not very experienced with GD. I do browse the manuals as I find questions though. From what I understand, as of PHP5, there's no predefined filter for waves or "wet floor"-like effects.
imagefilter() is the function that applies a filter, but the defined constants don't include a wave filter.
Maybe they have a newer version?
Edit:
I think I found it, all the functions are hand made using the
imagecopy() function. Some of the user contributed code is(authors bolded before the code):
administrador(ensaimada)sphoera(punt)com
PHP Code:
function wave_region($img, $x, $y, $width, $height,$grade=5){
for ($i=0;$i<$width;$i+=2){
imagecopy($img,$img,
$x+$i-2,$y+sin($i/10)*$grade, //dest
$x+$i,$y, //src
2,$height);
}
}
designerkamal at gmail dot com
PHP Code:
function Skew($src, $dest, $skew_val)
{
$imgsrc = imagecreatefromgif($src);
$width = imagesx($imgsrc);
$height = imagesy($imgsrc);
$imgdest = imagecreatetruecolor($width, $height+($height*$skew_val));
$trans = imagecolorallocate($imgdest,0,0,0);
$temp=0;
for($x=0 ; $x<$width ; $x++)
{
for($y=0 ; $y<$height ; $y++)
{
imagecopy($imgdest, $imgsrc, $x, $y+$temp, $x, $y, 1, 1);
imagecolortransparent($imgdest,$trans);
}
$temp+=$skew_val;
}
imagepng($imgdest, $dest);
imagedestroy($imgsrc);
imagedestroy($imgdest);
}
You could probably inspire some code for yourself based off these two functions, and get a slightly wavy skew filter.
Join the friendly bunch on IRC...
Applying a Filter in GD
Linear Mode
