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#!/usr/bin/perl
use strict;
use warnings;
use Glib qw(TRUE FALSE);
use Gtk2 '-init';
use Cairo;
my $window = Gtk2::Window->new;
$window->set_title("Rotation example");
$window->signal_connect( delete_event => sub { exit } );
$window->set_border_width(5);
my $rotated= Gtk2::Ex::RotatedBin->new;
my $entry=Gtk2::Entry->new;
my $button=Gtk2::Button->new_from_stock('gtk-ok');
$button->signal_connect(clicked=>sub {warn "clicked\n";});
my $checkh=Gtk2::CheckButton->new('mirror horizontally');
$checkh->signal_connect(toggled=>sub { $rotated->set_mirror( horizontal=> $_[0]->get_active ) });
my $checkv=Gtk2::CheckButton->new('mirror vertically');
$checkv->signal_connect(toggled=>sub { $rotated->set_mirror( vertical=> $_[0]->get_active ) });
my $adj=Gtk2::Adjustment->new(10, 0, 360, 1,10,0);
$adj->signal_connect(value_changed=> sub { $rotated->set_angle( $_[0]->value ); });
my $scale=Gtk2::HScale->new($adj);
my $vbox=Gtk2::VBox->new;
$vbox->add($_) for $entry,$button,$checkh,$checkv,$scale;
$rotated->add($vbox);
$window->add($rotated);
$window->show_all;
#Gtk2::Gdk::Window->set_debug_updates(1);
Gtk2->main;
#FIXME the child needs to be added before the RotatedBin is realized
# I haven't managed to make it work if the child is added or replaced after
package Gtk2::Ex::RotatedBin;
use Gtk2;
use List::Util qw/min max/;
use Glib::Object::Subclass
Gtk2::EventBox::,
signals =>
{ size_allocate => \&do_size_allocate,
size_request => \&do_size_request,
};
use constant PI => 4 * atan2(1,1); # needed for the rotation
sub INIT_INSTANCE {
my $self=shift;
$self->{angle}=10;
$self->signal_connect( expose_event => \&expose_cb);
$self->signal_connect( damage_event => \&damage_cb);
$self->signal_connect( realize => \&realize_cb);
return $self;
}
sub do_size_request {
my ($self,$req)=@_;
my $border= $self->get_border_width;
my $child_req=$self->child->size_request;
my $w= $child_req->width;
my $h= $child_req->height;
my $diag= sqrt( $w**2 + $h**2 );
$diag= 1+int $diag unless int($diag)==$diag; #round up
# request enough to satisfy the child request for any angle
$req->width( $diag+$border*2 );
$req->height( $diag+$border*2 );
}
sub do_size_allocate {
my ($self,$alloc)=@_;
my $border= $self->get_border_width;
my ($x,$y,$w,$h)=$alloc->values;
my $olda=$self->allocation;
$olda->x($x); $olda->width($w);
$olda->y($y); $olda->height($h);
$w-= 2*$border;
$h-= 2*$border;
$self->window->move_resize($x+$border,$y+$border,$w,$h) if $self->window;
$self->update_matrix;
}
sub set_angle {
my ($self,$angle)=@_;
$self->{angle}=$angle;
$self->update_matrix;
$self->queue_resize;
}
sub set_mirror {
my ($self,$h_or_v,$on)=@_;
my $key= $h_or_v eq 'vertical' ? 'vmirror' : 'hmirror';
$self->{$key}=$on;
$self->update_matrix;
$self->queue_draw;
}
# transform the rectangle and find a rectangle containing the transformed rectangle
sub transform_expose_rectangle {
my ($self,$rect,$inv)=@_;
my ($x,$y,$w,$h)=$rect->values;
my $matrix= $inv ? $self->{imatrix} : $self->{matrix};
my ($xa,$ya)=$matrix->transform_point($x, $y);
my ($xb,$yb)=$matrix->transform_point($x+$w,$y);
my ($xc,$yc)=$matrix->transform_point($x, $y+$h);
my ($xd,$yd)=$matrix->transform_point($x+$w,$y+$h);
$x= min($xa,$xb,$xc,$xd);
$y= min($ya,$yb,$yc,$yd);
$w= max($xa,$xb,$xc,$xd) -$x;
$h= max($ya,$yb,$yc,$yd) -$y;
return Gtk2::Gdk::Rectangle->new($x,$y,$w,$h);
}
sub update_matrix {
my $self=shift;
my ($x,$y,$w,$h)= $self->allocation->values;
my $border= $self->get_border_width;
$x+=$border; $w-=2*$border;
$y+=$border; $h-=2*$border;
my $angle= $self->{angle}*PI/180;
my $matrix0=Cairo::Matrix->init_rotate($angle);
my ($xa,$ya)=$matrix0->transform_distance(0,0);
my ($xb,$yb)=$matrix0->transform_distance($w,0);
my ($xc,$yc)=$matrix0->transform_distance(0,$h);
my ($xd,$yd)=$matrix0->transform_distance($w,$h);
my $rw= $w / ( max($xa,$xb,$xc,$xd) - min($xa,$xb,$xc,$xd) );
my $rh= $h / ( max($ya,$yb,$yc,$yd) - min($ya,$yb,$yc,$yd) );
my $r= min($rw,$rh);
my $cw= $w*$r;
my $ch= $h*$r;
my $matrix=Cairo::Matrix->init_identity;
$matrix->translate($w/2,$h/2);
$matrix->rotate($angle);
$matrix->translate( -$cw/2,-$ch/2 );
if ($self->{hmirror}) {
$matrix->scale(-1,1);
$matrix->translate( -$cw,0 );
}
if ($self->{vmirror}) {
$matrix->scale(1,-1);
$matrix->translate( 0,-$ch );
}
$self->{matrix}=$matrix;
my $imatrix= $matrix->multiply( Cairo::Matrix->init_identity ); #copy matrix
$imatrix->invert;
$self->{imatrix}= $imatrix;
if (my $o=$self->{offscreen})
{ $o->{matrix}= $self->{matrix};
$o->{imatrix}=$self->{imatrix};
$o->move_resize(0,0,$cw,$ch);
$o->geometry_changed;
}
if (my $child=$self->child)
{ my $rect=Gtk2::Gdk::Rectangle->new(0,0, $cw,$ch);
$self->child->size_allocate($rect);
}
}
sub damage_cb {
my ($self,$event)=@_;
my $rect= transform_expose_rectangle($self,$event->area);
$self->window->invalidate_rect( $rect, 0);
1;
}
sub realize_cb {
my ($self)=@_;
my ($x,$y,$w,$h)=$self->allocation->values;
my %attr=
( window_type => 'offscreen',
wclass => 'output',
event_mask => [qw/pointer-motion-mask button-press-mask button-release-mask exposure_mask/],
);
$self->{offscreen}= my $offscreen= Gtk2::Gdk::Window->new($self->get_root_window,\%attr);
$self->update_matrix; # will resize $offscreen to the correct size
$offscreen->set_user_data($self->Glib::Object::get_pointer());
$self->window->signal_connect( pick_embedded_child =>sub { return $offscreen; }); #could check if transformed position is inside offscreen window
$self->child->set_parent_window($offscreen) if $self->child;
$offscreen->set_embedder($self->window);
$offscreen->signal_connect( to_embedder => sub { return $_[0]{ matrix}->transform_point($_[1],$_[2]); });
$offscreen->signal_connect( from_embedder=> sub { return $_[0]{imatrix}->transform_point($_[1],$_[2]); });
$self->style->set_background($offscreen,'normal');
$offscreen->show;
}
sub expose_cb {
my ($self,$event)=@_;
my $offscreen= $self->{offscreen};
if ($event->window == $self->window) {
my $pixmap = $offscreen->get_pixmap;
return 1 unless $pixmap;
my $cr=Gtk2::Gdk::Cairo::Context->create($self->window);
$cr->rectangle($event->area);
$cr->clip;
$cr->set_matrix( $self->{matrix} );
$cr->set_source_pixmap($pixmap,0,0);
$cr->paint;
}
elsif ($event->window == $offscreen) {
$self->propagate_expose($self->child,$event) if $self->child;
}
1;
}
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