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<?php
require($_SERVER['DOCUMENT_ROOT'].'/banjo-glossary/fpdf/fpdf.php');

$pdf = new FPDF('P','pt','Letter');
// THESE VARS WILL BE SET DYNAMICALLY
$pdf->SetTitle('Create PDF test using FPDF',1);
$pdf->SetAuthor('The Banjo Glossary Project',1);
$pdf->SetSubject('Ongoing tests to create pdf files',1);
$pdf->SetCompression(1);

// LETTER size pages
// UNIT IS POINTS, 72 PTS = 1 INCH
$pageW = 612 - 36; // 8.5 inches wide with .25 margin left and right
$pageH = 792 - 36; // 11 inches tall with .25 margin top and bottom
$fixedMargin = 18; // .25 inch
$threshold = $pageW / $pageH;

// IF IMAGE W÷H IS UNDER THRESHOLD, CONSTRAIN THE HEIGHT
// IF IMAGE W÷H IS OVER THRESHOLD, CONSTRAIN THE WIDTH

$readPath = $_SERVER['DOCUMENT_ROOT'].'/banjo-glossary/_temp_/';
$writePath = $_SERVER['DOCUMENT_ROOT'].'/banjo-glossary/';

function sizeImage($thisImage) {
	global $pageW,$pageH,$fixedMargin,$threshold;

	list($thisW,$thisH) = getimagesize($thisImage);
    
    if($thisW<=$pageW && $thisH<=$pageH){
    	// DO NOT RESIZE IMAGE, JUST CENTER IT HORIZONTALLY
        $newLeftMargin = centerMe($thisW);
        $leftMargin = $newLeftMargin;
		return array('leftMargin' => $leftMargin, 'width' => $thisW);
    } else {
        $thisThreshold = $thisW / $thisH;
		if($thisThreshold>=$threshold) {
			$width = $pageW;
			$leftMargin = $fixedMargin;
		} else {
			$thisMultiplier = $pageH / $thisH;
			$width = $thisW * $thisMultiplier;
			$width = round($width, 0, PHP_ROUND_HALF_DOWN);
			// CENTER ON PAGE IF NOT FULL WIDTH
			$newLeftMargin = centerMe($width);
			$leftMargin = $newLeftMargin;
		}
		return array('leftMargin' => $leftMargin, 'width' => $width);
	}
}

function centerMe($thisWidth){
	global $pageW;
	$newMargin = ($pageW - $thisWidth) / 2;
	$newMargin = round($newMargin, 0, PHP_ROUND_HALF_DOWN);
	return $newMargin;
}

// THIS VAR WILL BE POPULATED DYNAMICALLY BUT HARD CORDED FOR THIS EXAMPLE
$imageLIST = array('tab-angeline-the-ba-12739-5552112112010.jpg','tab-at-the-end-of-t-11988-541238102009.jpg','tab-blue-night-(lam-12956-2337161222010.jpg','tab-eighth-of-janua-12698-2650161012010.jpg','tab-foggy-mountain--19894-3131218122013.jpg','tallThin.jpg');

foreach ($imageLIST as $value) {
	$currentImage = $readPath.$value;
	$reSized = sizeImage($currentImage);
	$width = $reSized['width'];
    $leftMargin = $reSized['leftMargin'];
	$pdf->AddPage();
	$pdf->Image($currentImage,$leftMargin,18,$width);

} // LOOP
 
$pdf->Output($writePath.'/TEST-PDFwrite99.pdf','F');

echo 'All done.';
?>