我很难弄清楚坐标是如何工作的。以下方法最终为我解决了，并为任何 tcpdf 文档绘制标记和出血：
/**
* Enlarges the MediaBox by the slug of the document in all directions and draws cropmarks,
* registrations marks and color bars
*
* @param $tcpdf the internal tcpdf object
*
* @access public
*/
public function drawCropbox($tcpdf, $slug = 6)
{
for ($i = 1; $i <= $tcpdf->getNumPages(); $i++) {
$tcpdf->setPage($i);
$width = $tcpdf->getPageWidth();
$height = $tcpdf->getPageHeight();
$outerWidth = $width + 2 * $slug;
$outerHeight = $height + 2 * $slug;
$barHeight = min($slug - 1, 6);
$barWidth = min(9 * $barHeight, ($width - $barHeight * 4)/ 2);
$barHeight = max(1, $barWidth / 9);
$registrationHeight = $barHeight / 2;
$tcpdf->setPageFormat(
array(
$outerWidth,
$outerHeight,
'Rotate' => 0,
'MediaBox' => array(
'llx' => -$slug, 'lly' => $height + $slug, 'urx' => $width + $slug, 'ury' => -$slug
),
)
);
//Crop left top
$tcpdf->cropMark(
$x = 0,
$y = $outerWidth - $height,
$w = $slug,
$h = $slug,
$type = 'A',
$color = array(0, 0, 0)
);
//Crop right top
$tcpdf->cropMark(
$x = $width,
$y = $outerWidth - $height,
$w = $slug,
$h = $slug,
$type = 'B',
$color = array(0, 0, 0)
);
//Crop left bottom
$tcpdf->cropMark(
$x = 0,
$y = $outerWidth,
$w = $slug,
$h = $slug,
$type = 'C',
$color = array(0, 0, 0)
);
//Crop right bottom
$tcpdf->cropMark(
$x = $width,
$y = $outerWidth,
$w = $slug,
$h = $slug,
$type = 'D',
$color = array(0, 0, 0)
);
//Registration left
$tcpdf->registrationMark(
$x = -$slug / 2,
$y = $width - $height / 2 + 2 * $slug,
$registrationHeight,
FALSE,
array(0, 0, 0),
array(255, 255, 255)
);
//Registration top
$tcpdf->registrationMark(
$x = $width / 2,
$y = $outerWidth - $height - $slug / 2,
$registrationHeight,
FALSE,
array(0, 0, 0),
array(255, 255, 255)
);
//Registration right
$tcpdf->registrationMark(
$x = $width + $slug / 2,
$y = $width - $height / 2 + 2 * $slug,
$registrationHeight,
FALSE,
array(0, 0, 0),
array(255, 255, 255)
);
//Registration bottom
$tcpdf->registrationMark(
$x = $width / 2,
$y = $outerWidth + $slug / 2,
$registrationHeight,
FALSE,
array(0, 0, 0),
array(255, 255, 255)
);
//Color Registration Bar
$tcpdf->colorRegistrationBar(
$x = $width - $barWidth - $barHeight,
$y = $outerWidth - $outerHeight + $slug,
$w = $barWidth,
$h = $barHeight,
FALSE,
TRUE,
'A,W,R,G,B,C,M,Y,K'
);
//Gray Registration Bar
$tcpdf->colorRegistrationBar(
$x = $barHeight,
$y = $outerWidth - $outerHeight + $slug,
$w = $barWidth,
$h = $barHeight,
TRUE,
FALSE,
'A'
);
}
}