PHP | imagickpixeliterator syncIterator()函数
ImagickPixelIterator::syncIterator()函数是PHP中的一个内置函数,用于同步像素迭代器。
句法:
bool ImagickPixelIterator::syncIterator( void )
参数:此函数不接受任何参数。
返回值:此函数在成功时返回 TRUE。
异常:此函数在出错时抛出 ImagickException。
下面给出的程序说明了PHP中的ImagickPixelIterator::syncIterator()函数:
方案一:
newImage(800, 250, 'black');
$imageIterator = $imagick->getPixelIterator();
// Loop through rows pixel value
foreach ($imageIterator as $pixels) {
// Loop through the pixels in the row value
foreach ($pixels as $column => $pixel) {
if ($column % 11) {
$pixel->setColor('yellow');
}
}
// Sync the iterator after each iteration
$imageIterator->syncIterator();
}
// Loop through pixel rows again for new color
foreach ($imageIterator as $pixels) {
// Loop through the pixels in the row
foreach ($pixels as $column => $pixel) {
if ($column % 20) {
$pixel->setColor('blue');
}
}
// Sync the iterator after each iteration
$imageIterator->syncIterator();
}
// Show the output
$imagick->setImageFormat('png');
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>
输出:
方案二:
getPixelIterator();
// Loop through pixel rows
foreach ($imageIterator as $pixels) {
// Loop through the pixels in the row
foreach ($pixels as $column => $pixel) {
// Get the current HSL
$HSL = $pixel->getHSL();
// Set the HSL and change only saturation
$pixel->setHSL($HSL['hue'], 2, $HSL['luminosity']);
}
// Sync the iterator after each iteration
$imageIterator->syncIterator();
}
// Show the output
$imagick->setImageFormat('png');
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>
输出:
参考: https://www. PHP.net/manual/en/imagickpixeliterator.synciterator。 PHP