function ImageRotateRightAngle( $imgSrc, $angle )
{
//source de cette fonction : http://www.developpez.net/forums/showthread.php?t=54169
$angle = min( ( (int)(($angle+45) / 90) * 90), 270 );
if( $angle == 0 )
return( $imgSrc );
$srcX = imagesx( $imgSrc );
$srcY = imagesy( $imgSrc );
switch( $angle )
{
case 90:
$imgDest = imagecreatetruecolor( $srcY, $srcX );
for( $x=0; $x<$srcX; $x++ )
for( $y=0; $y<$srcY; $y++ )
imagecopy($imgDest, $imgSrc, $srcY-$y-1, $x, $x, $y, 1, 1);
break;
case 180:
$imgDest = ImageFlip( $imgSrc, IMAGE_FLIP_BOTH );
break;
case 270:
$imgDest = imagecreatetruecolor( $srcY, $srcX );
for( $x=0; $x<$srcX; $x++ )
for( $y=0; $y<$srcY; $y++ )
imagecopy($imgDest, $imgSrc, $y, $srcX-$x-1, $x, $y, 1, 1);
break;
}
return( $imgDest );
}
function imageRotateBicubic($imgSrc, $angle)
{
// ensuring we got really RightAngle (if not we choose the closest one)
$angle = min((int) (($angle + 45) / 90) * 90, 270);
// no need to fight
if ($angle == 0) {
return $imgSrc;
}
// dimenstion of source image
$srcX = imagesx($imgSrc);
$srcY = imagesy($imgSrc);
switch ($angle) {
case 90:
$imgDest = imagecreatetruecolor($srcY, $srcX);
for ($x = 0; $x < $srcX; $x++) {
for ($y = 0; $y < $srcY; $y++) {
imagecopy($imgDest, $imgSrc, $srcY - $y - 1, $x, $x, $y, 1, 1);
}
}
break;
case 180:
$imgDest = ImageFlip($imgSrc, IMAGE_FLIP_BOTH);
break;
case 270:
$imgDest = imagecreatetruecolor($srcY, $srcX);
for ($x = 0; $x < $srcX; $x++) {
for ($y = 0; $y < $srcY; $y++) {
imagecopy($imgDest, $imgSrc, $srcY - $y - 1, $srcX - $x - 1, $x, $y, 1, 1);
}
}
break;
}
return $imgDest;
}