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#!/usr/bin/perl
use strict;
use warnings;
use PDF::Builder;
use PDF::Builder::Util;
#my $compress = 'none'; # no stream compression
my $compress = 'flate'; # compressed stream
my $pdf = PDF::Builder->new(-compress => $compress);
my $f1=$pdf->corefont('Helvetica', -encode=>'latin1');
my $f2=$pdf->corefont('Helvetica-Oblique', -encode=>'latin1');
my $page = $pdf->page();
$page->mediabox(595,842); # A4 paper
my $txt = $page->text();
my $grf = $page->gfx();
#$txt->font($f1, 20);
my $fsize = 20; # our standard font size for this page
my $subsupscl = 0.7; # scale factor for sub and superscripts
$grf->strokecolor('green'); # just leave line color as green
# rises (up +, down -) are relative to original baseline, not previous text
# further note that these are baseline changes, with no guarantee that text
# will not ascend above the original baseline (i.e., it is NOT the distance
# between the baseline and the TOP of the text!)
$grf->poly(50,800, 430,800);
$grf->poly(420,805, 430,805, 430,795, 420,795);
$grf->stroke();
$txt->translate(435,800);
$txt->fillcolor('green');
$txt->font($f1, $fsize*$subsupscl);
$txt->text('Baseline');
$txt->fillcolor('black');
$txt->font($f1, $fsize);
$txt->translate(50,800);
$txt->text('normal text ');
$txt->rise(5);
$txt->text('rise = 5 units');
$txt->rise(-5);
$txt->text('rise = -5 units');
$txt->rise(0);
# ----------------------------
$grf->poly(50,600, 430,600);
$grf->poly(420,610, 430,610, 430,590, 420,590);
$grf->stroke();
$txt->translate(435,600);
$txt->fillcolor('green');
$txt->font($f1, $fsize*$subsupscl);
$txt->text('Baseline');
$txt->fillcolor('black');
$txt->font($f1, $fsize);
$txt->translate(50,600);
$txt->text('normal text ');
$txt->rise(10);
$txt->text('rise = 10 units');
$txt->rise(-10);
$txt->text('rise = -10 units');
$txt->rise(0);
# ----------------------------
$grf->poly(50,400, 430,400);
$grf->poly(420,420, 430,420, 430,380, 420,380);
$grf->stroke();
$txt->translate(435,400);
$txt->fillcolor('green');
$txt->font($f1, $fsize*$subsupscl);
$txt->text('Baseline');
$txt->fillcolor('black');
$txt->font($f1, $fsize);
$txt->translate(50,400);
$txt->text('normal text ');
$txt->rise(20);
$txt->text('rise = 20 units');
$txt->rise(-20);
$txt->text('rise = -20 units');
$txt->rise(0);
# ----------------------------
# now for a line of text
# it would be good to consider a convenience function for
# subscript($scale,$font,$fontsize,$text) and likewise for superscript()
$txt->translate(50, 200);
$txt->text('The gases CO');
# $txt->subscript($subsupscl, $f1, $fsize, '2');
$txt->font($f1,$fsize*$subsupscl);
$txt->rise(-10*$subsupscl);
$txt->text('2');
$txt->rise(0);
$txt->font($f1,$fsize);
$txt->text(' and CH');
# $txt->subscript($subsupscl, $f1, $fsize, '4');
$txt->font($f1,$fsize*$subsupscl);
$txt->rise(-10*$subsupscl);
$txt->text('4');
$txt->rise(0);
$txt->font($f1,$fsize);
$txt->text(' are of concern for climate change.');
# ----------------------------
# and a math equation with sub- and superscripts
# italicize all variable name letters not function names
$txt->translate(50,100);
$txt->font($f2, $fsize); # italic y
$txt->text('y');
$txt->font($f1, $fsize); # roman = a
$txt->text(' = a');
# $txt->subscript($subsupscl, $f1, $fsize, '2');
$txt->font($f1,$fsize*$subsupscl); # <sub>2</sub>
$txt->rise(-10*$subsupscl);
$txt->text('2');
$txt->rise(0);
$txt->font($f2,$fsize); # italic x
$txt->text('x');
# $txt->superscript($subsupscl, $f1, $fsize, '2');
$txt->font($f1,$fsize*$subsupscl); # <sup>2</sup>
$txt->rise(10*$subsupscl);
$txt->text('2');
$txt->rise(0);
$txt->font($f1,$fsize);
$txt->text(' + a'); # roman + a
# $txt->subscript($subsupscl, $f1, $fsize, '1');
$txt->font($f1,$fsize*$subsupscl); # <sub>1</sub>
$txt->rise(-10*$subsupscl);
$txt->text('1');
$txt->rise(0);
$txt->font($f2,$fsize); # italic x
$txt->text('x');
# $txt->superscript($subsupscl, $f1, $fsize, '2');
$txt->font($f1,$fsize*$subsupscl); # <sup>1</sup>
$txt->rise(10*$subsupscl);
$txt->text('1');
$txt->rise(0);
$txt->font($f1,$fsize);
$txt->text(' + a'); # roman + a
# $txt->subscript($subsupscl, $f1, $fsize, '0');
$txt->font($f1,$fsize*$subsupscl); # <sub>0</sub>
$txt->rise(-10*$subsupscl);
$txt->text('0');
$txt->rise(0);
$txt->font($f1,$fsize);
$txt->text(' is an equation.');
# ----------------------------
# ah, just for the halibut, use functions
$txt->translate(50,65);
$txt->font($f2, $fsize); # italic y
$txt->text('y');
$txt->font($f1, $fsize); # roman = a
$txt->text(' = a');
subscript($subsupscl, $f1, $fsize, '3'); # <sub>3</sub>
$txt->font($f2,$fsize); # italic x
$txt->text('x');
superscript($subsupscl, $f1, $fsize, '3'); # <sup>3</sup>
$txt->font($f1,$fsize);
$txt->text(' + a'); # roman + a
subscript($subsupscl, $f1, $fsize, '2'); # <sub>2</sub>
$txt->font($f2,$fsize); # italic x
$txt->text('x');
superscript($subsupscl, $f1, $fsize, '2'); # <sup>2</sup>
$txt->font($f1,$fsize);
$txt->text(' + a'); # roman + a
subscript($subsupscl, $f1, $fsize, '1'); # <sub>1</sub>
$txt->font($f2,$fsize); # italic x
$txt->text('x');
superscript($subsupscl, $f1, $fsize, '1'); # <sup>1</sup>
$txt->font($f1,$fsize);
$txt->text(' + a'); # roman + a
subscript($subsupscl, $f1, $fsize, '0'); # <sub>0</sub>
$txt->font($f1,$fsize);
$txt->text(' is done with functions.');
# ----------------------------
$pdf->saveas("$0.pdf");
$pdf->end();
exit;
# TBD These might go into content or content::text.
# As a method, $txt might not have to be passed in if can use $self.
# It might be a good idea to save and restore the font and size, too
# (might need to extend font() method to return the current font and size).
# Restores old rise() value, such as for putting superscript on a
# subscript, etc., instead of hardcoded 0. Use the current font size
# instead of passing it in. Could have optional values to override the
# font, size, rise %, etc., by default using the old font. The sub/sup scale
# might default, with an override (is it strongly dependent on font?).
# Potentially only the $text might be a mandatory parameter, or combine
# the functions with a 'sup' or 'sub' parameter, since only one line diff.
# TBD Probably doesn't yet handle super on sub and vice-versa, or super on
# super, etc. Needs more thought.
sub subscript {
my ($subsupscl, $font, $fsize, $text) = @_;
my $oldRise = $txt->rise();
# save old font here -- need anyway for font() call unless override given
$txt->font($font, $fsize*$subsupscl);
$txt->rise(-$fsize/2*$subsupscl);
$txt->text($text);
# restore old font here
$txt->rise($oldRise);
return;
}
sub superscript {
my ($subsupscl, $font, $fsize, $text) = @_;
my $oldRise = $txt->rise();
# save old font here -- need anyway for font() call unless override given
$txt->font($font, $fsize*$subsupscl);
$txt->rise($fsize/2*$subsupscl);
$txt->text($text);
# restore old font here
$txt->rise($oldRise);
return;
}
__END__
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