PHP ImagickPixelIterator getIteratorRow()用法及代码示例

ImagickPixelIterator::getIteratorRow()函数是PHP中的内置函数，用于获取当前像素迭代器行。此函数用于在遍历图像像素时检查我们当前位于哪一行。

用法:

int ImagickPixelIterator::getIteratorRow( void )

参数：此函数不接受任何参数。

返回值：该函数返回一个包含当前像素迭代器行的整数值。

异常：该函数在错误时引发ImagickException。

下面给出的程序说明了PHP中的ImagickPixelIterator::getIteratorRow()函数：

程序1:

<?php 
// Create a new imagick object 
$imagick = new Imagick( 
    'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png'); 
  
// Get the pixel iterator 
$pixelIterator = $imagick->getPixelIterator(); 
  
// Get the current iterator row 
echo "Current row is " . $pixelIterator->getIteratorRow(); 
?>

输出：

Current row is 0 // which is the default row from where we start

程序2:

<?php 
// Create a new imagick object 
$imagick = new Imagick( 
    'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png'); 
  
  
// Get the pixel iterator 
$pixelIterator = $imagick->getPixelIterator(); 
  
// Set the pixel iterator to 30 
$pixelIterator->setIteratorRow(30); 
  
// Get the current iterator row 
echo "Current row is " . $pixelIterator->getIteratorRow(); 
?>

输出：

Current row is 30

程序3:

<?php 
// Create a new imagick object 
$imagick = new Imagick(); 
  
// Create a image on imagick object with size of 10x10 pixels 
$imagick->newImage(10, 10, 'black'); 
  
// Get the pixel iterator 
$imageIterator = $imagick->getPixelIterator(); 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
  
   // Get the current iterator row 
   echo "Current row is " . $imageIterator->getIteratorRow() . '<br>'; 
  
} 
?>

输出：

Current row is 0
Current row is 1
Current row is 2
Current row is 3
Current row is 4
Current row is 5
Current row is 6
Current row is 7
Current row is 8
Current row is 9

参考： https://www.php.net/manual/en/imagickpixeliterator.getiteratorrow.php

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注：本文由纯净天空筛选整理自gurrrung大神的英文原创作品 PHP | ImagickPixelIterator getIteratorRow() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。