Have you read closely the perldoc for the module? 
 You can optionally pass a font object and font size if you have loade
+d an external font.

         my $font_obj = $pdf->pdf->ttfont('new_font.ttf');
         $pdf->add_font('NewFont', $font_obj, '12');

       Refer to PDF::API2 for the various font methods, like "ttfont",
+ available.

[download]

Just from that, it appears that your $pdf->add_font('MonoFont',$font_obj); needs a font size specification added.

Furthermore, looking through the examples in PDF::API2, there are code constructs like 

# from examples/*02_truetype_fonts-pl 

        foreach $fe (qw(
                adobe-standard  cp437   cp850   latin1
        )) {
                print STDERR "$fn ($fe)\n";
                $font=$pdf->ttfont($fn , -encode =>$fe);



# from examples/*02_synthetic_fonts-pl 

use PDF::API2;
use PDF::API2::SynFont;

$pdf=PDF::API2->new;

$f1=$pdf->corefont('Arial',-encode=>'latin1');
$f2=$pdf->corefont('Helvetica-Bold',-encode=>'latin1');
$f3=$pdf->corefont('Helvetica-Oblique',-encode=>'latin1');
$f4=$pdf->corefont('Helvetica-BoldOblique',-encode=>'latin1');

my $font=PDF::API2::SynFont->new_api($pdf,$f1,-bold=>4);

[download]

so you may need to specify an encoding, or at least run some simple examples to see how to get your font code right.

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re^3: External font with PDF::API2::Simple by zentara
in thread External font with PDF::API2::Simple by Iceman1

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