Method putAlignmentPattern

text-to-qr/lib/phpqrcode/qrspec.php:299–334

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($version, &$frame, $width)

        //----------------------------------------------------------------------
        public static function putAlignmentPattern($version, &$frame, $width)
        {
            if($version < 2)
                return;

            $d = self::$alignmentPattern[$version][1] - self::$alignmentPattern[$version][0];
            if($d < 0) {
                $w = 2;
            } else {
                $w = (int)(($width - self::$alignmentPattern[$version][0]) / $d + 2);
            }

            if($w * $w - 3 == 1) {
                $x = self::$alignmentPattern[$version][0];
                $y = self::$alignmentPattern[$version][0];
                self::putAlignmentMarker($frame, $x, $y);
                return;
            }

            $cx = self::$alignmentPattern[$version][0];
            for($x=1; $x<$w - 1; $x++) {
                self::putAlignmentMarker($frame, 6, $cx);
                self::putAlignmentMarker($frame, $cx,  6);
                $cx += $d;
            }

            $cy = self::$alignmentPattern[$version][0];
            for($y=0; $y<$w-1; $y++) {
                $cx = self::$alignmentPattern[$version][0];
                for($x=0; $x<$w-1; $x++) {
                    self::putAlignmentMarker($frame, $cx, $cy);
                    $cx += $d;
                }
                $cy += $d;
            }
        }

        // Version information pattern -----------------------------------------