From ee37f58aafc6f75a1c5eb1e72c507dfcdf53c209 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Sun, 5 Dec 2010 21:15:42 +0000
Subject: slightly centered layout

---
 lib/GridFiller/Result/Pango.pm | 50 ++++++++++++++++++++++++++++++++++++++----
 script/qr-color.pl             |  8 +------
 2 files changed, 47 insertions(+), 11 deletions(-)

diff --git a/lib/GridFiller/Result/Pango.pm b/lib/GridFiller/Result/Pango.pm
index 81eba04..cfb2947 100644
--- a/lib/GridFiller/Result/Pango.pm
+++ b/lib/GridFiller/Result/Pango.pm
@@ -6,6 +6,7 @@ use MooseX::Types::Moose qw(Int);
 use Cairo;
 use Pango;
 use Carp;
+use POSIX 'ceil';
 
 extends 'GridFiller::Result';
 
@@ -108,15 +109,52 @@ sub _put_squares {
     return;
 }
 
-sub layout_for_word {
-    my ($self,$word) = @_;
+sub layout_for_string {
+    my ($self,$string) = @_;
 
     my $p = Pango::Cairo::create_layout($self->_cairo_c);
-    $p->set_text($word);
+    $p->set_text($string);
 
     return $p;
 }
 
+sub length_closure {
+    my ($self) = @_;
+
+    return sub { $self->string_width($_[0]) }
+}
+
+sub string_extents {
+    my ($self,$string) = @_;
+
+    my $p = $self->layout_for_string($string);
+    my ($w,$h) = $p->get_pixel_size;
+    return
+        ceil($w / $self->cell_size),
+        ceil($h / $self->cell_size);
+}
+
+sub string_width {
+    my ($self,$string) = @_;
+
+    return +($self->string_extents($string))[0];
+}
+
+sub string_height {
+    my ($self,$string) = @_;
+
+    return +($self->string_extents($string))[1];
+}
+
+sub _center_adj {
+    my ($self,$p) = @_;
+
+    my ($w) = $p->get_pixel_size;
+    my $size = $self->cell_size;
+    my $rounded = ceil($w/$size)*$size;
+    return +($rounded-$w)/2;
+}
+
 my $PI=3.1415926;
 
 sub place_word_at {
@@ -124,16 +162,20 @@ sub place_word_at {
 
     $self->log->debug("Placing $word at ${x}:${y} ($dir)");
 
-    my $p = $self->layout_for_word($word);
+    my $p = $self->layout_for_string($word);
     my $size = $self->cell_size;
     my $cr = $self->_cairo_c;
     $x*=$size;$y*=$size;
 
+    my $adjustment = $self->_center_adj($p);
+
     $cr->save;
     if ($dir == $HORIZONTAL) {
+        $x+=$adjustment;
         $cr->move_to($x,$y);
     }
     else {
+        $y+=$adjustment;
         $cr->move_to($x+$size,$y);
         $cr->rotate($PI/2);
     }
diff --git a/script/qr-color.pl b/script/qr-color.pl
index 807ec25..2a4d7f5 100644
--- a/script/qr-color.pl
+++ b/script/qr-color.pl
@@ -38,13 +38,7 @@ my $result = GridFiller::Result::Pango->new({
 
 $filler->result($result);
 $filler->status->mode('longest');
-$filler->status->length(
-    sub {
-        my $p = $result->layout_for_word(shift);
-        my ($w,$h) = $p->get_pixel_size;
-        return int(0.5 + $w / $result->cell_size);
-    }
-);
+$filler->status->length($result->length_closure);
 
 $filler->fill();
 
-- 
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