php 条形码生成器，PNG格式，底部有文本

Posted 2021-05-05

public function getBarcode($code, $type, $widthFactor = 2, $totalHeight = 30, $color = array(0, 0, 0))
{
    $barcodeData = $this->getBarcodeData($code, $type);

    // calculate image size
    $width = ($barcodeData['maxWidth'] * $widthFactor);
    $height = $totalHeight;

    if (function_exists('imagecreate')) {
        // GD library
        $imagick = false;
        $png = imagecreate($width, $height + 20); // +20 (+)
        $colorBackground = imagecolorallocate($png, 255, 255, 255);
        imagecolortransparent($png, $colorBackground);
        $colorForeground = imagecolorallocate($png, $color[0], $color[1], $color[2]);
    } elseif (extension_loaded('imagick')) {
        $imagick = true;
        $colorForeground = new \imagickpixel('rgb(' . $color[0] . ',' . $color[1] . ',' . $color[2] . ')');
        $png = new \Imagick();
        $png->newImage($width, $height + 20, 'none', 'png'); // +20 (+)
        $imageMagickObject = new \imagickdraw();
        $imageMagickObject->setFillColor($colorForeground);
    } else {
        return false;
    }

    // print bars
    $positionHorizontal = 0;
    foreach ($barcodeData['bars'] as $bar) {
        $bw = round(($bar['width'] * $widthFactor), 3);
        $bh = round(($bar['height'] * $totalHeight / $barcodeData['maxHeight']), 3);
        if ($bar['drawBar']) {
            $y = round(($bar['positionVertical'] * $totalHeight / $barcodeData['maxHeight']), 3);
            // draw a vertical bar
            if ($imagick && isset($imageMagickObject)) {
                $imageMagickObject->rectangle($positionHorizontal, $y, ($positionHorizontal + $bw), ($y + $bh));
            } else {
                imagefilledrectangle($png, $positionHorizontal, $y, ($positionHorizontal + $bw) - 1, ($y + $bh),
                    $colorForeground);
            }
        }
        $positionHorizontal += $bw;
    }

    if ($imagick && isset($imageMagickObject)) {
        $draw = new ImagickDraw();
        $draw->setFillColor('black');

        /* Font properties */
        $draw->setFont('Bookman-DemiItalic');
        $draw->setFontSize(5);

        // Write the barcode's code, change $code to write other text
        $imageMagickObject->annotateImage($draw, 0, $height + 5, 0, $code);
    }

    else
    {
        // Detect center position
        $font = 7;
        $font_width = ImageFontWidth($font);
        $font_height = ImageFontHeight($font);
        $text_width = $font_width * strlen($code);
        $position_center = ceil(($width - $text_width) / 2);

        // Default font
        // Write the barcode's code, change $code to write other text
        imagestring($png, 7, $position_center, $height + 5, $code, imagecolorallocate($png, 0, 0, 0));

        // For custom font specify path to font file
        /*$fontPath = '..\font.ttf';
        imagettftext($png, 12, 0, $position_center, $height + 5, imagecolorallocate($png, 0, 0, 0), $fontPath, $code);*/
    }

    ob_start();
    if ($imagick && isset($imageMagickObject)) {
        $png->drawImage($imageMagickObject);
        echo $png;
    } else {
        imagepng($png);
        imagedestroy($png);
    }
    $image = ob_get_clean();

    return $image;
}