# Copyright 2011, 2012, 2013 Kevin Ryde
# This file is part of Math-Image.
#
# Math-Image is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# Math-Image is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with Math-Image. If not, see <http://www.gnu.org/licenses/>.
package App::MathImage::Tk::Drawing;
use 5.008;
use strict;
use warnings;
use Tk;
use Image::Base::Tk::Photo;
use App::MathImage::Tk::Perl::WeakAfter;
use base 'Tk::Derived', 'Tk::Label';
Tk::Widget->Construct('AppMathImageTkDrawing');
our $VERSION = 110;
sub ClassInit {
my ($class, $mw) = @_;
### ClassInit(): $class
$class->SUPER::ClassInit($mw);
# event handlers for all instances
$mw->bind($class,'<Expose>',\&_do_expose);
$mw->bind($class,'<Configure>',\&queue_reimage);
$mw->bind($class,'<Button-1>', ['DragStart', Ev('x'), Ev('y')]);
$mw->bind($class,'<B1-Motion>', ['DragMotion', Ev('x'), Ev('y')]);
$mw->bind($class,'<MouseWheel>', ['MouseWheel', Ev('delta'), Ev('s')]);
$mw->bind($class,'<Button-4>', ['MouseWheel', 120, Ev('s')]);
$mw->bind($class,'<Button-5>', ['MouseWheel', -120, Ev('s')]);
}
sub Populate {
my ($self, $args) = @_;
### Drawing Populate(): $args
my %args = (-background => 'black',
-foreground => 'white',
-activebackground => 'black',
-activeforeground => 'white',
-disabledforeground => 'white',
-borderwidth => 0, # default
# must initial -image so that Tk::Label -width and -height are
# interpreted as pixels, not lines/columns
-image => $self->Photo (-width => 1, -height => 1),
-width => 1, # desired size any size, not from -image
-height => 1,
%$args,
);
$self->SUPER::Populate(\%args);
### background: $self->cget('-background')
### borderwidth: $self->cget('-borderwidth')
$self->{'dirty'} = 1;
$self->{'aft'} = App::MathImage::Tk::Perl::WeakAfter->new;
}
sub destroy {
my ($self) = @_;
### Drawing destroy() ...
if (my $image = $self->cget('-image')) {
$self->configure('-image',undef);
$image->delete;
}
shift->SUPER::destroy(@_);
}
# sub DESTROY {
# my ($self) = @_;
# ### Drawing DESTROY() ...
# shift->SUPER::DESTROY(@_);
# }
sub queue_reimage {
my ($self) = @_;
### queue_reimage() ...
### background: $self->cget('-background')
$self->{'dirty'} = 1;
delete $self->{'gen_object'};
$self->{'aft'}->idle($self, \&_do_expose);
}
sub _do_expose {
my ($self) = @_;
### Drawing Expose() ...
if (! $self->{'dirty'}) {
return;
}
$self->{'dirty'} = 0;
if (my $id = delete $self->{'draw_id'}) { $id->cancel; }
my $gen = $self->gen_object;
my $borderwidth = $self->cget('-borderwidth');
my $width = $self->width - 2*$borderwidth;
my $height = $self->height - 2*$borderwidth;
my $photo = $self->cget('-image');
if ($photo) {
$photo->configure(-width => $width,
-height => $height);
} else {
$photo = $self->Photo (-width => $width, -height => $height);
$self->configure (-image => $photo);
}
my $image = Image::Base::Tk::Photo->new (-tkphoto => $photo);
$gen->draw_Image_start ($image);
# FIXME: want some sort of low-priority after()
#
$self->{'aft'}->after($self, 20, \&_update_draw_steps);
$self->configure(-cursor => 'watch');
}
sub _update_draw_steps {
my ($self) = @_;
### _update_draw_steps() some ...
my $gen = $self->gen_object;
if ($gen->draw_Image_steps) {
### _update_draw_steps() more ...
$self->{'aft'}->after($self, 20, \&_update_draw_steps);
} else {
### _update_draw_steps() finished
$self->configure (-cursor => undef);
}
}
sub gen_object {
my ($self) = @_;
return ($self->{'gen_object'} ||= do {
my $gen_options = $self->{'gen_options'} || {};
### $gen_options
my $background = $self->cget('-background');
my $foreground = $self->cget('-foreground');
my $borderwidth = $self->cget('-borderwidth');
my $width = $self->width - 2*$borderwidth;
my $height = $self->height - 2*$borderwidth;
### $width
### $height
### $background
### $foreground
### state: $self->cget('-state')
App::MathImage::Generator->new
(step_time => 0.5,
step_figures => 1000,
%$gen_options,
width => $width,
height => $height,
# background => $background,
# foreground => $foreground,
)
});
}
sub centre {
my ($self) = @_;
my $gen_options = $self->{'gen_options'};
if ($gen_options->{'x_offset'} || $gen_options->{'y_offset'}) {
$gen_options->{'x_offset'} = 0;
$gen_options->{'y_offset'} = 0;
$self->queue_reimage;
}
}
#------------------------------------------------------------------------------
# mouse wheel
sub MouseWheel {
my ($self, $delta, $state) = @_;
### MouseWheel() ...
### $delta
### $state
# "Control" by page, otherwise by step
my $frac = ($state =~ /control/i ? 0.9 : 0.1) * $delta/120;
# "Shift" horizontally, otherwise vertically
if ($state =~ /shift/i) {
$self->{'gen_options'}->{'x_offset'} += int($self->width * $frac);
} else {
$self->{'gen_options'}->{'y_offset'} -= int($self->height * $frac);
}
$self->queue_reimage;
}
#------------------------------------------------------------------------------
# mouse drag
# $event is a wxMouseEvent
sub DragStart {
my ($self, $x, $y) = @_;
### Drawing DragStart() ...
$self->{'drag_x'} = $x;
$self->{'drag_y'} = $y;
}
sub DragMotion {
my ($self, $x, $y) = @_;
### Drawing DragMotion() ...
if (defined $self->{'drag_x'}) {
### drag ...
$self->{'gen_options'}->{'x_offset'} += $x - $self->{'drag_x'};
$self->{'gen_options'}->{'y_offset'} -= $y - $self->{'drag_y'};
$self->{'drag_x'} = $x;
$self->{'drag_y'} = $y;
$self->queue_reimage;
}
}
1;
__END__