文字
Imagick::getPixelRegionIterator
(PECL imagick 2.0.0)
Imagick::getPixelRegionIterator — Get an ImagickPixelIterator for an image section
说明
ImagickPixelIterator Imagick::getPixelRegionIterator
( int
$x
, int $y
, int $columns
, int $rows
)Get an ImagickPixelIterator for an image section.
参数
-
x -
The x-coordinate of the region.
-
y -
The y-coordinate of the region.
-
columns -
The width of the region.
-
rows -
The height of the region.
返回值
Returns an ImagickPixelIterator for an image section.
错误／异常
错误时抛出 ImagickException。
范例
Example #1 Imagick::getPixelRegionIterator() example
Iterate over the pixels in the top left of the image, changing them to be black.
<?php
$im = new Imagick ( realpath ( "./testImage.png" ));
$areaIterator = $im -> getPixelRegionIterator ( 0 , 0 , 10 , 10 );
foreach ( $areaIterator as $rowIterator ) {
foreach ( $rowIterator as $pixel ) {
// Paint every pixel black
$pixel -> setColor ( "rgba(0, 0, 0, 0)" );
}
$areaIterator -> syncIterator ();
}
$im -> writeImage ( "./output.png" );
?>