<?php
/* PIMG module: scans a rectangle and returns an array of pimg_pixel instances for each pixel */
class pimg_scan
{
/* Resources */
private $pimg;
// PIMG constructor
function __construct($pimg)
{
$this -> pimg = $pimg;
}
/*
Scans a rectangle defined by it's start points x, y and width and height.
@param: $x - x of start point
@param: $y - y of start point
@param: $width - rectangle width
@param: $height - rectangle height
@result: an array of pimg_pixel instances for each pixel
*/
function init($x = 0, $y = 0, $width = 1, $height = 1)
{
/* INPUT VALIDATORS */
if ($x < 0)
{
$x = 0;
$this -> pimg -> setDebug('X start point must be >= 0, using 0 as default', 'notice', __CLASS__);
}
if ($y < 0)
{
$y = 0;
$this -> pimg -> setDebug('Y start point must be >= 0, using 0 as default', 'notice', __CLASS__);
}
if ($width <= 0)
{
$this -> pimg -> setDebug('Width of selection must be > 0, using 1 as default', 'notice', __CLASS__);
$width = 1;
}
if ($height <= 0)
{
$this -> pimg -> setDebug('Height of selection must be > 0, using 1 as default', 'notice', __CLASS__);
$height = 1;
}
if ($x + $width > $this -> pimg -> width())
{
$width = $this -> pimg -> width() - $x;
$this -> pimg -> setDebug('Selection\'s destination width is out of image\'s bounds, will scan till the end', 'notice', __CLASS__);
}
if ($y + $height > $this -> pimg -> height())
{
$height = $this -> pimg -> height() - $y;
$this -> pimg -> setDebug('Selection\'s destination height is out of image\'s bounds, will scan till the end', 'notice', __CLASS__);
}
// Go through all pixels
$result = array();
for($i = 0; $i < $width; $i++)
for($j = 0; $j < $height; $j++)
{
$color = imagecolorsforindex($this -> pimg -> handle(), imagecolorat($this -> pimg -> handle(), $x + $i, $y + $j));
$result[$i][$j] = $this -> pimg -> pixel($x + $i, $y + $j, $this -> pimg -> color($color['red'], $color['green'], $color['blue'], $color['alpha']));
}
// Return the matrix
return $result;
}
}
?>
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