Eduardokum\LaravelBoleto\Boleto\Render\AbstractPdf::calculateDimensions PHP Method

    protected function calculateDimensions($width, $height, $maxwidth, $maxheight)
    {
        if ($width != $height) {
            if ($width > $height) {
                $t_width = $maxwidth;
                $t_height = $t_width * $height / $width;
                //fix height
                if ($t_height > $maxheight) {
                    $t_height = $maxheight;
                    $t_width = $width * $t_height / $height;
                }
            } else {
                $t_height = $maxheight;
                $t_width = $width * $t_height / $height;
                //fix width
                if ($t_width > $maxwidth) {
                    $t_width = $maxwidth;
                    $t_height = $t_width * $height / $width;
                }
            }
        } else {
            $t_width = $t_height = min($maxheight, $maxwidth);
        }
        return array('width' => (int) $t_width, 'w' => (int) $t_width, 'height' => (int) $t_height, 'h' => (int) $t_height);
    }