PHP ImagickPixelIterator setIteratorFirstRow()用法及代码示例

ImagickPixelIterator::setIteratorFirstRow()函数是PHP中的内置函数，用于将像素迭代器设置为第一像素行。

用法:

bool ImagickPixelIterator::setIteratorFirstRow( void )

参数：此函数不接受任何参数。

返回值：成功时此函数返回TRUE。

以下示例程序旨在说明PHP中的ImagickPixelIterator::setIteratorFirstRow()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(); 
    
// Set the pixel iterator to 50 
$pixelIterator->setIteratorRow(50); 
   
// Get the current iterator row 
echo "Current row is " . $pixelIterator->getIteratorRow(); 
   
// Set the iterator to first row 
$pixelIterator->setIteratorFirstRow(); 
   
// Get the current iterator row 
echo "<br>Current row is " . $pixelIterator->getIteratorRow(); 
?>

输出：

Current row is 50
Current row is 0

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(); 
  
$pixelIterator->setIteratorRow(40); 
   
// Get the current iterator row 
$row = $pixelIterator->getCurrentIteratorRow(); 
echo "Colors of 61th and 62nd pixel from 40th row are:<br>"; 
print("Pixel 60:" . "<pre>".print_r($row[60]->getColor(), true)."</pre>"); 
print("Pixel 61:" . "<pre>".print_r($row[61]->getColor(), true)."</pre>"); 
  
// Set the iterator to first row 
$pixelIterator->setIteratorFirstRow(); 
  
// Get the current iterator row 
$row = $pixelIterator->getCurrentIteratorRow(); 
echo "First two colors of pixels from first row are:<br>"; 
print("Pixel 1:" . "<pre>".print_r($row[0]->getColor(), true)."</pre>"); 
print("Pixel 2:" . "<pre>".print_r($row[1]->getColor(), true)."</pre>"); 
?>

输出：

Colors of 61th and 62nd pixel from 40th row are:
Pixel 60:
Array
(
    [r] => 110
    [g] => 199
    [b] => 131
    [a] => 1
)
Pixel 61:
Array
(
    [r] => 23
    [g] => 165
    [b] => 57
    [a] => 1
)
First two colors of pixels from first row are:
Pixel 1:
Array
(
    [r] => 255
    [g] => 255
    [b] => 255
    [a] => 1
)
Pixel 2:
Array
(
    [r] => 255
    [g] => 255
    [b] => 255
    [a] => 1
)

参考： https://www.php.net/manual/en/imagickpixeliterator.setiteratorfirstrow.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 setIteratorFirstRow() 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。