Here i show a simple example for this Line to.
<?php
$doc=new HaruDoc;
$page=$doc->addPage();
$page->setSize(HaruPage::SIZE_A4, HaruPage::PORTRAIT);
$page->setRGBStroke(0,0,0); // Set color to black
$page->setRGBFill(1,1,1); // Set fill to 100% for each rgb color
$page->moveTo(60, 100); // Move cursor to x 60, y 100
$page->lineTo(60,500); // Create line from x 60, y100 to x60, y500
$page->fillStroke();
//Output
header('Content-Type: application/pdf');
$doc->output();
?>