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[0] in function chmod in /var/www/hopeinstoughton_www/wp-content/plugins/simple-universal-google-analytics/main.php on line 8
[1] in function include_once in /var/www/hopeinstoughton_www/wp-settings.php on line 560
[2] in function require_once in /var/www/hopeinstoughton_www/wp-config.php on line 85
[3] in function require_once in /var/www/hopeinstoughton_www/wp-load.php on line 50
[4] in function require_once in /var/www/hopeinstoughton_www/wp-blog-header.php on line 13
[5] in function require in /var/www/hopeinstoughton_www/index.php on line 17

<?php	// dynamic qrcodes

// requires php5-gd

require_once __DIR__ . '/qrcode.php';

class Qrcode_Model extends Model {
	
	private $info;
	private $png;
	private $fgcol;
	private $startofrow;
	private $num_cols;
	private $num_rows;
	private $colorStart;
	private $colorEnd;
	private $markers;
	
	function __construct() {
		parent::__construct();
	}
	
	public function generateQRCode($info) {
		$this->info = $info;
		$data = $info->text ?? '(text goes here)';
		$qrcode = new QRcode($data, $info->quality ?? 'H');
		$barcode_array = $qrcode->getBarcodeArray();
		$this->markers = $qrcode->ALIGNMENTS;

		$cols = 2 + max($barcode_array['num_cols'], $barcode_array['num_rows']);
		$size = $info->size ?? '200x200';
		[$wd, $ht] = explode('x', $size);
		$cellsize = intval($wd / $cols);
		$barcode_array['code'] = $data;
		
		$colorfg = $info->colorStart ?? '#000';
		$colorbg = $info->colorBackground ?? FALSE;
		
		$colorfg2 = $info->colorEnd ?? $colorfg;
		$this->colorEnd = $this->hex2rgb($colorfg2);
		
		$imagetext = $this->getBarcodePngData($barcode_array, $cellsize, $cellsize, $colorfg, $colorbg);
		$info->imagedata = $imagetext;
	}
	
	function _generateGradientsInterpolate($pBegin, $pEnd, $pStep, $pMax) {
		if ($pBegin < $pEnd) {
			return (($pEnd - $pBegin) * ($pStep / $pMax)) + $pBegin;
		} else {
			return (($pBegin - $pEnd) * (1 - ($pStep / $pMax))) + $pEnd;
		}
	}	
	
	public function generateBlip($r, $c, $x, $y, $w, $h) {
		if ($this->startofrow) {
			$this->startofrow = FALSE;
			$steps = $this->num_rows;
			
			$theR = $this->_generateGradientsInterpolate($this->colorStart[0], $this->colorEnd[0], $r, $steps);
			$theG = $this->_generateGradientsInterpolate($this->colorStart[1], $this->colorEnd[1], $r, $steps);
			$theB = $this->_generateGradientsInterpolate($this->colorStart[2], $this->colorEnd[2], $r, $steps);			
			$this->fgcol = imagecolorallocate($this->png, $theR, $theG, $theB);
		}
		imagefilledrectangle($this->png, $x, $y, ($x + $w - 1), ($y + $h - 1), $this->fgcol);
		
	}
	
	private function isMarkerStart(&$barcode_array, $r, $c, $w, $h) {
		foreach($this->markers as $m) {
			if ($r == $m['y'] && $c == $m['x']) {
				// clear out items
				$sz = $m['sz'];
				for($i = 0; $i < $sz; $i++) {
					for($j = 0; $j < $sz; $j++) {
						$barcode_array['bcode'][$r + $i][$c + $j] = 0;
					}
				}
				// draw the new shape
				//
				return $sz;
			}
		}
		return 0;
	}
	
	function hex2rgb($hex) {
		$hex = str_replace('#', '', $hex);

		if(strlen($hex) == 3) {
			$r = hexdec(substr($hex,0,1).substr($hex,0,1));
			$g = hexdec(substr($hex,1,1).substr($hex,1,1));
			$b = hexdec(substr($hex,2,1).substr($hex,2,1));
		} else {
			$r = hexdec(substr($hex,0,2));
			$g = hexdec(substr($hex,2,2));
			$b = hexdec(substr($hex,4,2));
		}
		return [ $r, $g, $b ];
	}
		
	/**
	 * Return a PNG image representation of barcode (requires GD or Imagick library).
	 * @param $w (int) Width of a single rectangle element in pixels.
	 * @param $h (int) Height of a single rectangle element in pixels.
	 * @param $color (array) RGB (0-255) foreground color for bar elements (background is transparent).
 	 * @return image or false in case of error.
 	 * @public
	 */
	// this version has a white border around it
	public function getBarcodePngData($barcode_array, $w=3, $h=3, $colorfg, $colorbg) {
		// calculate image size
		$width = (($barcode_array['num_cols'] + 2) * $w);
		$height = (($barcode_array['num_rows'] + 2) * $h);
		$this->num_cols = $barcode_array['num_cols'];
		$this->num_rows = $barcode_array['num_rows'];

		// GD library
		$imagick = false;
		$this->png = imagecreate($width, $height);
	
		$transparent = $colorbg === FALSE;
		if ($transparent) $colorbg = '#fff';
		
		$rgb = $this->hex2rgb($colorbg);
		$bgcol = imagecolorallocate($this->png, $rgb[0], $rgb[1], $rgb[2]);
		if ($transparent) imagecolortransparent($this->png, $bgcol);
		$rgb = $this->hex2rgb($colorfg);
		$this->colorStart = $rgb;
		$this->fgcol = imagecolorallocate($this->png, $rgb[0], $rgb[1], $rgb[2]);

		// print barcode elements
		$y = 0;
		// for each row
		for ($r = -1; $r <= $barcode_array['num_rows']; ++$r) {
			$x = 0;
			$this->startofrow = TRUE;
			// for each column
			for ($c = -1; $c <= $barcode_array['num_cols']; ++$c) {
				//if ($this->isMarkerStart($barcode_array, $r, $c, $w, $h)) {
				//}
				if (($barcode_array['bcode'][$r][$c] ?? 0) > 0) {
					$this->generateBlip($r, $c, $x, $y, $w, $h);		// draw a single barcode cell
				} else {
					// space for graphic?
				}
				$x += $w;
			}
			$y += $h;
		}
		
		ob_start();
		imagepng($this->png);
		$imagedata = ob_get_clean();
		imagedestroy($this->png);
		return $imagedata;
		
		// putAlignmentMarker is smaller bottom right square
		// putFinderPattern are the larger ones
	}
			
}