PDF_begin_template

(PHP 4 >= 4.0.5, PECL pdflib >= 1.0.0)

PDF_begin_template — Start template definition [deprecated]

说明

PDF_begin_template ( resource $pdfdoc , float $width , float $height ) : int

Starts a new template definition.

This function is deprecated since PDFlib version 7, use PDF_begin_template_ext() instead.

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User Contributed Notes 2 notes

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rz at daimi dot au dot dk ¶

14 years ago


A template is an "image" that can be drawn like a normal image, but is composed of pdflib-commands, directly specified in the program.
Templates can be used if you have a graphical pattern that you want to repeat several times - i.e. a logo repeated on top of each page. As the pdf-commands that draws the template are only included once in the file even if the template is shown several times, you can save a lot of space.

This program draws a simple fractal without the use of templates:

<?php
function drawmenger(&$pdf,$x,$y,$w,$level) {
  if($level===0) {
    pdf_rect($pdf,$x,$y,$w,$w);
    pdf_fill($pdf);
    return;
  }
  $w /= 3;
  for($i=0; $i<3; $i++)
    for($j=0; $j<3; $j++)
      if($i!=1 || $j!=1)
    drawmenger($pdf,$x+$w*$j,$y+$w*$i,$w,$level-1);
}
$pdf = pdf_new();
pdf_open_file($pdf);
pdf_begin_page($pdf, 595, 421);
drawmenger($pdf,50,50,300,6);

header('Content-type: application/pdf');
header('Content-disposition: inline; filename=test.pdf');
header('Content-length: ' . strlen($data));
echo $data;
pdf_end_page($pdf);
pdf_close($pdf);
pdf_delete($pdf);
?>

The file created is almost 1Mb.
Using templates to store the intermediate results reduces the filesize to a mere 3kb.

<?php
function drawmenger(&$pdf,$x,$y,$w,$level) {
  if($level===0) {
    pdf_rect($pdf,$x,$y,$w,$w);
    pdf_fill($pdf);
    return;
  }
  $w /= 3;
  for($i=0; $i<3; $i++)
    for($j=0; $j<3; $j++)
      if($i!=1 || $j!=1)
    drawmenger($pdf,$x+$w*$j,$y+$w*$i,$w,$level-1);
}
$pdf = pdf_new();
pdf_open_file($pdf);
pdf_begin_page($pdf, 595, 421);
drawmenger($pdf,50,50,300,6);

header('Content-type: application/pdf');
header('Content-disposition: inline; filename=test.pdf');
header('Content-length: ' . strlen($data));
echo $data;
pdf_end_page($pdf);
pdf_close($pdf);
pdf_delete($pdf);
?>

down

rz at daimi dot au dot dk ¶

14 years ago


Sorry. In the previous note I somehow managed to include the same program twice.
The program that uses templates to draw the fractal is

<?php
function initmengers(&$pdf,$level) {
  static $mengers;
  if($level>0) initmengers($pdf,$level-1);
  $mengers[$level] = pdf_begin_template($pdf,1,1);
  if($level===0) {
    pdf_rect($pdf,$x,$y,1,1);
    pdf_fill($pdf);
  }
  else {
    for($i=0; $i<3; $i++)
      for($j=0; $j<3; $j++)
    if($i!=1 || $j!=1)
      pdf_place_image($pdf,$mengers[$level-1],$j/3,$i/3,1/3);
  }
  pdf_end_template($pdf);
  return $mengers[$level];
}
$pdf = pdf_new();
pdf_open_file($pdf);
$pic = initmengers($pdf,6);
pdf_begin_page($pdf, 595, 421);
pdf_place_image($pdf,$pic,50,50,300);
pdf_end_page($pdf);
pdf_close($pdf);
$data = pdf_get_buffer($pdf);
header('Content-type: application/pdf');
header('Content-disposition: inline; filename=test.pdf');
header('Content-length: ' . strlen($data));
echo $data;
pdf_delete($pdf);
?>

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官方地址：https://www.php.net/manual/en/function.pdf-begin-template.php

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PDF_begin_template

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User Contributed Notes 2 notes