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package PDF::Imposition::Schema2up; |
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use strict; |
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use warnings; |
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use Types::Standard qw/Bool/; |
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use namespace::clean; |
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use Moo; |
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with 'PDF::Imposition::Schema'; |
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=head1 NAME |
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PDF::Imposition::Schema2up - Imposition schema 2up (booklet) |
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=head1 SYNOPSIS |
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use PDF::Imposition::Schema2up; |
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my $imposer = PDF::Imposition::Schema2up->new( |
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signature => "10-20", |
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file => "test.pdf", |
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output => "out.pdf", |
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cover => 1, |
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); |
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# or call the methods below to set the values, and then call: |
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$imposer->impose; |
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The output pdf will be in C<$imposer->output> |
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=head1 SCHEMA EXPLANATION |
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This schema is a variable and dynamic method. The signature, i.e., the |
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booklets which compose the document, are not fixed-sized, but can be |
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altered. The purpose is to have 1 or more booklets that you print |
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recto-verso and just fold to have your home-made book (this schema is |
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aimed to DIY people). |
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39
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Say you have a text with 60 pages in A5: you would print it on A4, |
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double-side, take the pile out of the printer, fold it and clip it. |
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The schema looks like (for a signature of 8 pages on 2 sheets): |
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RECTO S.1 VERSO S.1 |
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+-----+-----+ +-----+-----+ |
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| 8 | 1 | | 2 | 7 | |
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+-----+-----+ +-----+-----+ |
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RECTO S.2 VERSO S.2 |
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+-----+-----+ +-----+-----+ |
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| 6 | 3 | | 4 | 5 | |
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+-----+-----+ +-----+-----+ |
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=head1 METHODS |
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60
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=head2 Public methods |
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=head3 signature |
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64
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The signature, must be a multiple of 4, or a range, like the string |
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"20-100". If a range is selected, the signature is determined |
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heuristically to minimize the white pages left on the last signature. |
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The wider the range, the best the results. |
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69
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This is useful if you are doing batch processing, and you don't know |
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the number of page in advance (so you can't tweak the source pdf to |
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have a suitable number of page via text-block dimensions or font |
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changes). |
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74
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Typical case: you define a signature of 60 pages, and your PDF happens |
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to have 61 pages. How unfortunate, and you just can't put out a PDF |
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with 59 blank pages. The manual solution is to change something in the |
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document to get it under 60 pages, but this is not always viable or |
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desirable. So you define a dynamic range for signature, like 20-60, |
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(so the signature will vary between 20 and 60) and the routine will |
80
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find the best one, which in this particular case happens to be 32 (so |
81
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the text will have two booklets, and the second will have 3 blank |
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pages). |
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84
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Es. |
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86
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$imposer->signature("20-60"); |
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88
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Keep in mind that a signature with more than 100 pages is not suitable |
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to be printed and folded at home (too thick), so to get some |
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acceptable result, the sheets must be cut and glued together by a |
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binder, so in this case you want to go with the single signature for |
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the whole pdf. |
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94
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If no signature is specified, the whole text will be imposed on a |
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single signature, regardeless of its size. |
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97
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98
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=cut |
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100
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1224
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sub pages_per_sheet { 4 }; |
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102
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=head3 cover |
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104
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This schema supports the cover option. |
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106
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=cut |
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108
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has cover => (is => 'rw', isa => Bool); |
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110
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111
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=head2 INTERNALS |
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113
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=head3 pages_per_sheet |
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115
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Always return 4. |
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117
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=head3 page_sequence_for_booklet($pages, $signature) |
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119
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Algorithm taken/stolen from C (Angus J. C. Duggan 1991-1995). |
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The C are still a viable solution if you want to go with the |
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PDF->PS->PDF route. |
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123
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=cut |
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125
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sub page_sequence_for_booklet { |
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1
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my ($self, $pages, $signature) = @_; |
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# if set to 0, get the actual number |
128
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$signature ||= $self->computed_signature; |
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$pages ||= $self->total_pages; |
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240
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my $maxpage = $self->total_output_pages; |
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52
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my @pgs; |
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{ |
133
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7717
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use integer; |
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79
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33
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45
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134
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136
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for (my $currentpg = 0; $currentpg < $maxpage; $currentpg++) { |
135
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476
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374
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my $actualpg = $currentpg - ($currentpg % $signature); |
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476
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327
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my $modulo = $currentpg % 4; |
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100
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100
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1474
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if ($modulo == 0 or $modulo == 3) { |
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138
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238
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252
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$actualpg += $signature - 1 - (($currentpg % $signature) / 2); |
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} |
140
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elsif ($modulo == 1 or $modulo == 2) { |
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238
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199
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$actualpg += ($currentpg % $signature) / 2; |
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} |
143
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476
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100
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467
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if ($actualpg < $pages) { |
144
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439
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269
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$actualpg++; |
145
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} else { |
146
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37
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37
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$actualpg = undef; |
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} |
148
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476
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640
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push @pgs, $actualpg; |
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} |
150
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} |
151
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33
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my @out; |
152
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# if we want a cover, we need to find the index of the last page, |
153
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# and the first undef page, which could be at the beginning of the |
154
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# last signature, so we have to scan the array. |
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33
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100
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548
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if ($self->cover) { |
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15
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94
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my $last; |
157
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my $firstundef; |
158
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159
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# find the last page |
160
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15
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54
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for (my $i = 0; $i < @pgs; $i++) { |
161
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220
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100
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100
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664
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if ($pgs[$i] and $pgs[$i] == $pages) { |
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34
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$last = $i; |
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} |
164
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} |
165
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166
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# find the first empty page (inserted by us) |
167
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15
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52
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for (my $i = 0; $i < @pgs; $i++) { |
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100
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237
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if (not defined $pgs[$i]) { |
169
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$firstundef = $i; |
170
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6
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10
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last; |
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} |
172
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} |
173
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174
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# if we don't find a white page, there is nothing to do |
175
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15
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100
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42
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if (defined $firstundef) { |
176
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# there is an undef, so swap; |
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10
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$pgs[$firstundef] = $pgs[$last]; |
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6
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10
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$pgs[$last] = undef; |
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} |
180
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} |
181
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170
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while (@pgs) { |
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476
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push @out, [ shift(@pgs), shift(@pgs) ]; |
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} |
184
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return \@out; |
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} |
186
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187
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sub _do_impose { |
188
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22
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22
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44
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my $self = shift; |
189
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# prototype |
190
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22
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351
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$self->out_pdf_obj->mediabox( |
191
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$self->orig_width * 2, |
192
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$self->orig_height, |
193
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); |
194
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21
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2216
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my $seq = $self->page_sequence_for_booklet; |
195
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21
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55
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foreach my $p (@$seq) { |
196
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# loop over the pages |
197
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150
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23724
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my $left = $self->get_imported_page($p->[0]); |
198
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150
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3281688
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my $right = $self->get_imported_page($p->[1]); |
199
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150
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1602891
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my $page = $self->out_pdf_obj->page(); |
200
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150
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40334
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my $gfx = $page->gfx(); |
201
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150
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100
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15092
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if (defined $left) { |
202
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138
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394
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$gfx->formimage($left, 0, 0); |
203
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} |
204
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150
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100
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29261
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if (defined $right) { |
205
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141
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469
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$gfx->formimage($right, $self->orig_width, 0); |
206
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} |
207
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} |
208
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} |
209
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210
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=head1 INTERNALS |
211
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212
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=head2 cropmarks_options |
213
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214
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Set inner to false. |
215
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|
|
|
216
|
|
|
|
|
|
|
=cut |
217
|
|
|
|
|
|
|
|
218
|
|
|
|
|
|
|
|
219
|
|
|
|
|
|
|
sub cropmarks_options { |
220
|
15
|
|
|
15
|
1
|
107
|
my %options = ( |
221
|
|
|
|
|
|
|
top => 1, |
222
|
|
|
|
|
|
|
bottom => 1, |
223
|
|
|
|
|
|
|
inner => 0, |
224
|
|
|
|
|
|
|
outer => 1, |
225
|
|
|
|
|
|
|
twoside => 1, |
226
|
|
|
|
|
|
|
); |
227
|
15
|
|
|
|
|
208
|
return %options; |
228
|
|
|
|
|
|
|
} |
229
|
|
|
|
|
|
|
|
230
|
|
|
|
|
|
|
|
231
|
|
|
|
|
|
|
1; |
232
|
|
|
|
|
|
|
|
233
|
|
|
|
|
|
|
=head1 SEE ALSO |
234
|
|
|
|
|
|
|
|
235
|
|
|
|
|
|
|
L |
236
|
|
|
|
|
|
|
|
237
|
|
|
|
|
|
|
=cut |
238
|
|
|
|
|
|
|
|