general/metric_topdown_coordinates
Output text using metric coordinates in a topdown coordinate system.
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<?php
/*
* Metric topdown coordinates:
* Output text using metric coordinates in a topdown coordinate system
*
* Use topdown coordinates starting from the top left instead of the bottom
* left, scale the coordinate system to use metric coordinates, and place some
* horizontal lines 1 cm from each other.
*
* Required software: PDFlib/PDFlib+PDI/PPS 9
* Required data: none
*/
/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";
$outfile = "";
$title = "Metric Topdown Coordinates";
try {
$p = new pdflib();
$p->set_option("searchpath={" . $searchpath . "}");
/* This means we must check return values of load_font() etc. */
$p->set_option("errorpolicy=return");
if ($p->begin_document($outfile, "") == 0)
throw new Exception("Error: " . $p->get_errmsg());
$p->set_info("Creator", "PDFlib Cookbook");
$p->set_info("Title", $title);
$font = $p->load_font("NotoSerif-Regular", "unicode", "");
if ($font == 0)
throw new Exception("Error: " . $p->get_errmsg());
/* Start an A4 page and use topdown coordinates */
$p->begin_page_ext(0, 0, "width=a4.width height=a4.height topdown");
/* Scale the coordinate system to use metric coordinates.
* By default, PDFlib will expect incoming coordinates in DTP points
* which are defined as: 1 pt = 1/72 inch = 25.4/72 mm = 0.3528 mm.
* In order to supply the coordinates in centimeters instead of points
* we have to calculate the scaling factor as follows:
* (72 points/inch) / (2.54 cm/inch) = 28.3465 points/cm.
*/
$p->scale(28.3465, 28.3465);
/* Now, PDFlib will interpret all coordinates (except for interactive
* features, see below) in centimeters. The scaling is only in effect
* for the current page, and must be repeated on each page (if so
* desired).
*/
/* Interpret all coordinates for hypertext elements in the coordinates
* defined above as well
*/
$p->set_option("usercoordinates=true");
/* Place some horizontal lines 1 cm from each other.
* With the third line, draw a rectangle.
*/
$p->setlinewidth(0.01);
for ($i = 1; $i < 29; $i++) {
$p->moveto(0, $i);
$p->lineto(1, $i);
if ($i == 3) {
$p->rect(0, $i, 1, 1);
}
$p->fill_stroke();
}
/* Set the font size in cm */
$p->setfont($font, 0.5);
$p->fit_textline("Centimeters from the top left instead of points from " .
"the bottom left:", 2, 5, "");
$p->fit_textline("The small lines on the left are placed 1 cm from " .
"each other.", 2, 6, "");
$p->fit_textline("This text line is displayed at 7 cm from top and 2 " .
"cm from the left.", 2, 7, "");
$p->end_page_ext("");
$p->end_document("");
$buf = $p->get_buffer();
$len = strlen($buf);
header("Content-type: application/pdf");
header("Content-Length: $len");
header("Content-Disposition: inline; filename=metric_topdown_coordinates.pdf");
print $buf;
} catch (PDFlibException $e){
echo("PDFlib exception occurred:\n" .
"[" . $e->get_errnum() . "] " . $e->get_apiname() .
": " . $e->get_errmsg() . "\n");
exit(1);
} catch (Throwable $e) {
echo("PHP exception occurred: " . $e->getMessage() . "\n");
exit(1);
}
$p = 0;
?>