TCPDF add line across page in header

I have created a custom header for my PDF cre开发者_JAVA技巧ated with TCPDF. Now I would like to add a blue line (about 2px width) that goes across the page at the bottom of the header but can't figure out how?

I believe you do it like this:

$style = array('width' => 0.5, 'cap' => 'butt', 'join' => 'miter', 'dash' => 0, 'color' => array(255, 0, 0));

$pdf->Line(5, 10, 80, 30, $style);

Here is the full example

http://www.tcpdf.org/examples/example_012.phps

I found the easiest way to put line

$pdf->writeHTML("<hr>", true, false, false, false, '');

You can also use the page axis:

$pdf->Line(5, $pdf->y, $pdf->w - 5, $pdf->y);

However if you are trying to render a colored <hr> html tag you will need to adjust the TCPDF::DrawColor (this excerpt is from code that adds a graph bar to each row of a data report as per $twidth and $lengthmm):

$htmlbar = '<hr style="width:' . $lengthmm . 'mm;">';
$oldDrawColor = $pdf->DrawColor;
$pdf->setDrawColor(121, 161, 46);
$pdf->MultiCell($twidth,'2',$htmlbar,0,'L',$fill,1,'','',true,0,true,false,4,'T',false);
$pdf->DrawColor = $oldDrawColor;

Drawing a horizontal black line at the current position:

$style = ['width' => 0.2, 'cap' => 'butt', 'join' => 'miter', 'dash' => 0, 'color' => [0, 0, 0]];
$this->pdf->SetLineStyle($style);

$this->pdf->Line(PDF_MARGIN_LEFT, $this->pdf->getY(), $this->pdf->getPageWidth()-PDF_MARGIN_LEFT, $this->pdf->getY());
$this->pdf->Ln();

The point is to get the x value for the second point. This is how I do it:

$pageWidth    = $pdf->getPageWidth();   // Get total page width, without margins
$pageMargins  = $pdf->getMargins();     // Get all margins as array
$headerMargin = $pageMargins['header']; // Get the header margin
$px2          = $pageWidth - $headerMargin; // Compute x value for second point of line

$p1x   = $this->getX();
$p1y   = $this->getY();
$p2x   = $px2;
$p2y   = $p1y;  // Use same y for a straight line
$style = array();
$this->Line($p1x, $p1y, $p2x, $p2y, $style);

Links TCPDF::getMargins()
http://www.tcpdf.org/doc/code/classTCPDF.html#ae9bd660bf5b5e00eea82f1168cc67b5b

TCPDF::getPageWidth()
http://www.tcpdf.org/doc/code/classTCPDF.html#a510ab21d6a373934bcd3bd4683704b7e

Have fun!

Just add some HTML : )

$html ='<hr>';
$pdf->writeHTML($html, true, false, true, false, '');