我试图在旋转图像（许多图像$im）后复制图像（到$img），但我得到了奇怪的行为。一旦我取消对//$img =行的注释，我只会在最终输出中获得旋转后的图像。我可以旋转内部$im并将其复制到最终图像$img吗？
<?php
$height = 80;
$width = 300;
$img = imagecreate($width, $height);
$c = imagecolorallocate ($img , 135, 135, 135);
imagefill($img, 0, 0, imagecolorallocate($img, 255, 255, 255));
for($i=0; $i<=5; $i++){
$im = imagecreatetruecolor(35, 35);
$gry = imagecolorallocate($im, 135, 135, 135);
$wht = imagecolorallocate($im, 255, 255, 255);
$j = mt_rand(0, 1);
$ch = mt_rand(0,1)?chr(rand(65, 90)):chr(rand(97, 122));
if($j == 0){
imagefill($im, 0, 0, $wht);
imagefttext($im, 20, 0, 3, 21, $gry, 'AHGBold.ttf', $ch);
//$img = imagerotate($im, mt_rand(0,10)-5, $wht);
}else{
imagefill($im, 0, 0, $gry);
imagefttext($im, 20, 0, 3, 21, $wht, 'AHGBold.ttf', $ch);
//$img = imagerotate($im, mt_rand(0,10)-5, $gry);
}
imagecopyresampled($img, $im, 5 + $i*42, $height/2 - 12, 0, 0, 40, 40, 25, 25);
}
header('Content-type: image/png');
imagepng($img);
更改
$img = imagerotate($im, mt_rand(0,10)-5, $wht);
和
$img = imagerotate($im, mt_rand(0,10)-5, $gry);
至
$im = imagerotate($im, mt_rand(0,10)-5, $wht);
和
$im = imagerotate($im, mt_rand(0,10)-5, $gry);
如果imagerotes不起作用，可以使用以下功能旋转图像：
function imagerotateEquivalent(&$srcImg, $angle, $bgcolor, $ignore_transparent = 0)
{
$srcw = imagesx($srcImg);
$srch = imagesy($srcImg);
if($angle == 0) return $srcImg;
// Convert the angle to radians
$theta = deg2rad ($angle);
// Calculate the width of the destination image.
$temp = array ( rotateX(0, 0, 0-$theta),
rotateX($srcw, 0, 0-$theta),
rotateX(0, $srch, 0-$theta),
rotateX($srcw, $srch, 0-$theta)
);
$minX = floor(min($temp));
$maxX = ceil(max($temp));
$width = $maxX - $minX;
// Calculate the height of the destination image.
$temp = array ( rotateY(0, 0, 0-$theta),
rotateY($srcw, 0, 0-$theta),
rotateY(0, $srch, 0-$theta),
rotateY($srcw, $srch, 0-$theta)
);
$minY = floor(min($temp));
$maxY = ceil(max($temp));
$height = $maxY - $minY;
$destimg = imagecreatetruecolor($width, $height);
imagefill($destimg, 0, 0, imagecolorallocate($destimg, 0,255, 0));
// sets all pixels in the new image
for($x=$minX;$x<$maxX;$x++) {
for($y=$minY;$y<$maxY;$y++)
{
// fetch corresponding pixel from the source image
$srcX = round(rotateX($x, $y, $theta));
$srcY = round(rotateY($x, $y, $theta));
if($srcX >= 0 && $srcX < $srcw && $srcY >= 0 && $srcY < $srch)
{
$color = imagecolorat($srcImg, $srcX, $srcY );
}
else
{
$color = $bgcolor;
}
imagesetpixel($destimg, $x-$minX, $y-$minY, $color);
}
}
return $destimg;
}
function rotateX($x, $y, $theta){
return $x * cos($theta) - $y * sin($theta);
}
function rotateY($x, $y, $theta){
return $x * sin($theta) + $y * cos($theta);
}
我从php.net