The ImagickPixelIterator::setIteratorFirstRow() function is an inbuilt function in PHP which is used to set the pixel iterator to the first pixel row.
Syntax:
bool ImagickPixelIterator::setIteratorFirstRow( void )
Parameters: This function doesn’t accepts any parameter.
Return Value: This function returns TRUE on success.
Below programs illustrate the ImagickPixelIterator::setIteratorFirstRow() function in PHP:
Program 1:
<?php // Create a new imagick object $imagick = new Imagick( // 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(); ?> |
Output:
Current row is 50 Current row is 0
Program 2:
<?php // Create a new imagick object $imagick = new Imagick( // 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>"); ?> |
Output:
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
)
Reference: https://www.php.net/manual/en/imagickpixeliterator.setiteratorfirstrow.php
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