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PHP | ImagickPixelIterator newPixelRegionIterator() Function

  • Last Updated : 14 Jan, 2020
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The ImagickPixelIterator::newPixelRegionIterator() function is an inbuilt function in PHP which is used to get a new pixel iterator from a specific region from the imagick wand.

Syntax:

bool ImagickPixelIterator::newPixelRegionIterator( Imagick $wand,
         int $x, int $y, int $columns, int $rows )

Parameters: This function accept five parameters as mentioned above and described below:

  • $wand: It specifies the imagick wand.
  • $x: It specifies the x-coordinate.
  • $y: It specifies the y-coordinate.
  • $columns: It specifies the number of columns.
  • $rows: It specifies the numbers of rows.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.



Below programs illustrate the ImagickPixelIterator::newPixelRegionIterator() function in PHP:

Program 1: This program drawing a square on a blank image.




<?php
  
// Create a new imagick object
$imagick = new Imagick();
  
// Create a image on imagick object
$imagick->newImage(800, 250, 'black');
  
// Create a new ImagickPixelIterator instance
$imageIterator = new ImagickPixelIterator();
  
// Get the pixels from a image region
$imageIterator->newPixelRegionIterator($imagick, 40, 30, 200, 200);
  
// Loop through pixel rows
foreach ($imageIterator as $row => $pixels) {
     
    foreach ($pixels as $column => $pixel) {
  
        // Set the color of each pixel
        $pixel->setColor('red');
    }
  
    // Sync the iterator after each iteration
    $imageIterator->syncIterator();
}
   
// Show the output
$imagick->setImageFormat('png');
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>

Output:

Program 2: This program drawing a rectangle on a png image.




<?php
  
// Create a new imagick object
$imagick = new Imagick(
  
// Create a new ImagickPixelIterator instance
$imageIterator = new ImagickPixelIterator();
  
// Get the pixels from a image region
$imageIterator->newPixelRegionIterator($imagick, 40, 100, 1200, 20);
  
// Loop through pixel rows
foreach ($imageIterator as $row => $pixels) {
     
    foreach ($pixels as $column => $pixel) {
  
        // Set the color of each pixel
        $pixel->setColor('#62AC45');
    }
  
    // Sync the iterator after each iteration
    $imageIterator->syncIterator();
}
   
// Show the output
$imagick->setImageFormat('png');
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>

Output:

Reference: https://www.php.net/manual/en/imagickpixeliterator.newpixelregioniterator.php




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