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Ace/Graphics/Glyph.pm  view on Meta::CPAN

package Ace::Graphics::Glyph;

use strict;
use GD;

# simple glyph class
# args:  -feature => $feature_object
# args:  -factory => $factory_object
sub new {
  my $class = shift;
  my %arg = @_;
  my $feature = $arg{-feature};
  my ($start,$end) = ($feature->start,$feature->end);
  ($start,$end) = ($end,$start) if $start > $end;
  return bless {
		@_,
		top   => 0,
		left  => 0,
		right => 0,
		start => $start,
		end   => $end
	       },$class;
}

# delegates
# any of these can be overridden safely
sub factory   {  shift->{-factory}            }
sub feature   {  shift->{-feature}            }
sub fgcolor   {  shift->factory->fgcolor      }
sub bgcolor   {  shift->factory->bgcolor   }
sub fontcolor {  shift->factory->fontcolor      }
sub fillcolor {  shift->factory->fillcolor }
sub scale     {  shift->factory->scale     }
sub width     {  shift->factory->width     }
sub font      {  shift->factory->font      }
sub option    {  shift->factory->option(shift) }
sub color     {
  my $self    = shift;
  my $factory = $self->factory;
  my $color   = $factory->option(shift) or return $self->fgcolor;
  $factory->translate($color);
}

sub start     { shift->{start}                 }
sub end       { shift->{end}                   }
sub offset    { shift->factory->offset      }
sub length    { shift->factory->length      }

# this is a very important routine that dictates the
# height of the bounding box.  We start with the height
# dictated by the factory, and then adjust if needed
sub height   {
  my $self = shift;
  $self->{cache_height} = $self->calculate_height unless exists $self->{cache_height};
  return $self->{cache_height};
}

sub calculate_height {
  my $self = shift;
  my $val = $self->factory->height;
  $val += $self->labelheight if $self->option('label');
  $val;
}

# change our offset
sub move {
  my $self = shift;
  my ($dx,$dy) = @_;
  $self->{left} += $dx;
  $self->{top}  += $dy;
}

# positions, in pixel coordinates
sub top    { shift->{top}                 }
sub bottom { my $s = shift; $s->top + $s->height   }
sub left {
  my $self = shift;
  $self->{cache_left} = $self->calculate_left unless exists $self->{cache_left};
  return $self->{left} + $self->{cache_left};
}
sub right {
  my $self = shift;
  $self->{cache_right} = $self->calculate_right unless exists $self->{cache_right};
  return $self->{left} + $self->{cache_right};
}

sub calculate_left {
  my $self = shift;
  my $val = $self->{left} + $self->map_pt($self->{start} - 1);
  $val > 0 ? $val : 0;
}

sub calculate_right {
  my $self = shift;
  my $val = $self->{left} + $self->map_pt($self->{end} - 1);
  $val = 0 if $val < 0;
  $val = $self->width if $val > $self->width;
  if ($self->option('label') && (my $label = $self->label)) {
    my $left = $self->left;
    my $label_width = $self->font->width * CORE::length $label;
    my $label_end   = $left + $label_width;
    $val = $label_end if $label_end > $val;
  }
  $val;
}

sub map_pt {
  my $self = shift;
  my $point = shift;
  $point -= $self->offset;
  my $val = $self->{left} + $self->scale * $point;
  my $right = $self->{left} + $self->width;
  $val = -1 if $val < 0;
  $val = $self->width if $right && $val > $right;
  return int $val;
}

sub labelheight {
  my $self = shift;
  return $self->{labelheight} ||= $self->font->height;
}

sub label {
  my $f = (my $self = shift)->feature;
  if (ref (my $code = $self->option('label')) eq 'CODE') {
    return $code->($f);
  }
  my $info = eval {$f->info};
  return $info if $info;
  return $f->seqname if $f->can('seqname');
  return $f->primary_tag;
}

# return array containing the left,top,right,bottom
sub box {
  my $self = shift;
  return ($self->left,$self->top,$self->right,$self->bottom);
}

# these are the sequence boundaries, exclusive of labels and doodads
sub calculate_boundaries {
  my $self = shift;
  my ($left,$top) = @_;

  my $x1 = $left + $self->map_pt($self->{start} - 1);
  $x1 = 0 if $x1 < 0;

  my $x2 = $left + $self->map_pt($self->{end} - 1);
  $x2 = 0 if $x2 < 0;

  my $y1 = $top + $self->{top};
  $y1 += $self->labelheight if $self->option('label');
  my $y2 = $y1 + $self->factory->height;

  $x2 = $x1 if $x2-$x1 < 1;
  $y2 = $y1 if $y2-$y1 < 1;

  return ($x1,$y1,$x2,$y2);
}

sub filled_box {
  my $self = shift;
  my $gd = shift;
  my ($x1,$y1,$x2,$y2,$color) = @_;

  my $fc = defined($color) ? $color : $self->fillcolor;

  my $linewidth = $self->option('linewidth') || 1;
  $gd->filledRectangle($x1,$y1,$x2,$y2,$fc);
  $gd->rectangle($x1,$y1,$x2,$y2,$self->fgcolor);

  # and fill it
#  $self->fill($gd,$x1,$y1,$x2,$y2);

  # if the left end is off the end, then cover over
  # the leftmost line
  my ($width) = $gd->getBounds;
  $gd->line($x1,$y1,$x1,$y2,$fc)
    if $x1 < 0;

  $gd->line($x2,$y1,$x2,$y2,$fc)
    if $x2 > $width;
}

sub filled_oval {
  my $self = shift;
  my $gd = shift;
  my ($x1,$y1,$x2,$y2) = @_;
  my $cx = ($x1+$x2)/2;
  my $cy = ($y1+$y2)/2;

  my $linewidth = $self->option('linewidth') || 1;
  if ($linewidth > 1) {
    my $pen = $self->make_pen($linewidth);
    # draw a box
    $gd->setBrush($pen);
    $gd->arc($cx,$cy,$x2-$x1,$y2-$y1,0,360,gdBrushed);
  } else {
    $gd->arc($cx,$cy,$x2-$x1,$y2-$y1,0,360,$self->fgcolor);
  }

  # and fill it
  $gd->fill($cx,$cy,$self->fillcolor);
}

Ace/Graphics/Glyph.pm  view on Meta::CPAN

=head2 OBJECT METHODS

Once a glyph is created, it responds to a large number of methods.  In
this section, these methods are grouped into related categories.

Retrieving glyph context:

=over 4

=item $factory = $glyph->factory

Get the Ace::Graphics::GlyphFactory associated with this object.  This
cannot be changed once it is set.

=item $feature = $glyph->feature

Get the sequence feature associated with this object.  This cannot be
changed once it is set.

=back

Retrieving glyph options:

=over 4

=item $fgcolor = $glyph->fgcolor

=item $bgcolor = $glyph->bgcolor

=item $fontcolor = $glyph->fontcolor

=item $fillcolor = $glyph->fillcolor

These methods return the configured foreground, background, font and
fill colors for the glyph in the form of a GD::Image color index.

=item $width = $glyph->width

Return the maximum width allowed for the glyph.  Most glyphs will be
smaller than this.

=item $font = $glyph->font

Return the font for the glyph.

=item $option = $glyph->option($option)

Return the value of the indicated option.

=item $index = $glyph->color($color)

Given a symbolic or #RRGGBB-form color name, returns its GD index.

=back


Retrieving information about the sequence:

=over 4

=item $start = $glyph->start

=item $end   = $glyph->end

These methods return the start and end of the glyph in base pair
units.

=item $offset = $glyph->offset

Returns the offset of the segment (the base pair at the far left of
the image).

=item $length = $glyph->length

Returns the length of the sequence segment.

=back


Retrieving formatting information:

=over 4

=item $top = $glyph->top

=item $left = $glyph->left

=item $bottom = $glyph->bottom

=item $right = $glyph->right

These methods return the top, left, bottom and right of the glyph in
pixel coordinates.

=item $height = $glyph->height

Returns the height of the glyph.  This may be somewhat larger or
smaller than the height suggested by the GlyphFactory, depending on
the type of the glyph.

=item $scale = $glyph->scale

Get the scale for the glyph in pixels/bp.

=item $height = $glyph->labelheight

Return the height of the label, if any.

=item $label = $glyph->label

Return a human-readable label for the glyph.

=back

These methods are called by Ace::Graphics::Track during the layout
process:

=over 4

=item $glyph->move($dx,$dy)

Move the glyph in pixel coordinates by the indicated delta-x and
delta-y values.

=item ($x1,$y1,$x2,$y2) = $glyph->box