PHP ImagickPixelIterator resetIterator()用法及代碼示例

ImagickPixelIterator::resetIterator()函數是PHP中的內置函數，用於重置像素迭代器。

用法:

bool ImagickPixelIterator::resetIterator( void )

參數：此函數不接受任何參數。

返回值：成功時此函數返回TRUE。

以下示例程序旨在說明PHP中的ImagickPixelIterator::resetIterator()函數：

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 "Before reset row is " . $pixelIterator->getIteratorRow(); 
  
// Reset the iterator 
$pixelIterator->resetIterator(); 
  
// Get the current iterator row 
echo "<br>After reset row is " . $pixelIterator->getIteratorRow(); 
?>

輸出：

Before reset row is 50
After reset 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>"); 
  
// Reset the iterator to first row 
$pixelIterator->resetIterator(); 
   
// 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>"); 
?>

輸出：

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
)

參考： https://www.php.net/manual/en/imagickpixeliterator.resetiterator.php

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