chillerlan\QRCode\Data\QRMatrix::setLogoSpace()

Complexity

Conditions	19
Paths	85

Size

Total Lines

51

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
	public function setLogoSpace(int $width, int $height, int $startX = null, int $startY = null):QRMatrix{

		// for logos we operate in ECC H (30%) only
		if($this->eclevel !== 0b10){
			throw new QRCodeDataException('ECC level "H" required to add logo space');
		}

		// we need uneven sizes to center the logo space, adjust if needed
		if($startX === null && ($width % 2) === 0){
			$width++;
		}

		if($startY === null && ($height % 2) === 0){
			$height++;
		}

		// $this->moduleCount includes the quiet zone (if created), we need the QR size here
		$length = $this->version * 4 + 17;

		// throw if the logo space exceeds the maximum error correction capacity
		if($width * $height > floor($length * $length * 0.2)){
			throw new QRCodeDataException('logo space exceeds the maximum error correction capacity');
		}

		// quiet zone size
		$qz    = ($this->moduleCount - $length) / 2;
		// skip quiet zone and the first 9 rows/columns (finder-, mode-, version- and timing patterns)
		$start = $qz + 9;
		// skip quiet zone
		$end   = $this->moduleCount - $qz;

		// determine start coordinates
		$startX = ($startX !== null ? $startX : ($length - $width) / 2) + $qz;
		$startY = ($startY !== null ? $startY : ($length - $height) / 2) + $qz;

		// clear the space
		foreach($this->matrix as $y => $row){
			foreach($row as $x => $val){
				// out of bounds, skip
				if($x < $start || $y < $start ||$x >= $end || $y >= $end){
					continue;
				}
				// a match
				if($x >= $startX && $x < ($startX + $width) && $y >= $startY && $y < ($startY + $height)){
					$this->set($x, $y, false, $this::M_LOGO);
				}
			}
		}

		return $this;
	}