protected function renderImageByImagick($code)
{
$backColor = $this->transparent ? new \ImagickPixel('transparent') : new \ImagickPixel('#' . str_pad(dechex($this->backColor), 6, 0, STR_PAD_LEFT));
$foreColor = new \ImagickPixel('#' . str_pad(dechex($this->foreColor), 6, 0, STR_PAD_LEFT));
$image = new \Imagick();
$image->newImage($this->width, $this->height, $backColor);
$draw = new \ImagickDraw();
$draw->setFont($this->fontFile);
$draw->setFontSize(30);
$fontMetrics = $image->queryFontMetrics($draw, $code);
$length = strlen($code);
$w = (int) $fontMetrics['textWidth'] - 8 + $this->offset * ($length - 1);
$h = (int) $fontMetrics['textHeight'] - 8;
$scale = min(($this->width - $this->padding * 2) / $w, ($this->height - $this->padding * 2) / $h);
$x = 10;
$y = round($this->height * 27 / 40);
for ($i = 0; $i < $length; ++$i) {
$draw = new \ImagickDraw();
$draw->setFont($this->fontFile);
$draw->setFontSize((int) (rand(26, 32) * $scale * 0.8));
$draw->setFillColor($foreColor);
$image->annotateImage($draw, $x, $y, rand(-10, 10), $code[$i]);
$fontMetrics = $image->queryFontMetrics($draw, $code[$i]);
$x += (int) $fontMetrics['textWidth'] + $this->offset;
}
$image->setImageFormat('png');
return $image->getImageBlob();
}