ACE::GRAPHICS::GLYPH(3PM) - Linux man page online | Library functions

Base class for Ace::Graphics::Glyph objects.

Ace::Graphics::Glyph(3pm) User Contributed Perl Documentation Ace::Graphics::Glyph(3pm)


Ace::Graphics::Glyph - Base class for Ace::Graphics::Glyph objects


See Ace::Graphics::Panel.


Ace::Graphics::Glyph is the base class for all glyph objects. Each glyph is a wrapper around an Ace::Sequence::Feature object, knows how to render itself on an Ace::Graphics::Panel, and has a variety of configuration variables. End developers will not ordinarily work directly with Ace::Graphics::Glyph, but may want to subclass it for customized displays.


This section describes the class and object methods for Ace::Graphics::Glyph. CONSTRUCTORS Ace::Graphics::Glyph objects are constructed automatically by an Ace::Graphics::GlyphFactory, and are not usually created by end-developer code. $glyph = Ace::Graphics::Glyph->new(-feature=>$feature,-factory=>$factory) Given a sequence feature, creates an Ace::Graphics::Glyph object to display it. The -feature argument points to the Ace::Sequence::Feature object to display. -factory indicates an Ace::Graphics::GlyphFactory object from which the glyph will fetch all its run-time configuration information. A standard set of options are recognized. See OPTIONS. 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: $factory = $glyph->factory Get the Ace::Graphics::GlyphFactory associated with this object. This cannot be changed once it is set. $feature = $glyph->feature Get the sequence feature associated with this object. This cannot be changed once it is set. Retrieving glyph options: $fgcolor = $glyph->fgcolor $bgcolor = $glyph->bgcolor $fontcolor = $glyph->fontcolor $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. $width = $glyph->width Return the maximum width allowed for the glyph. Most glyphs will be smaller than this. $font = $glyph->font Return the font for the glyph. $option = $glyph->option($option) Return the value of the indicated option. $index = $glyph->color($color) Given a symbolic or #RRGGBB-form color name, returns its GD index. Retrieving information about the sequence: $start = $glyph->start $end = $glyph->end These methods return the start and end of the glyph in base pair units. $offset = $glyph->offset Returns the offset of the segment (the base pair at the far left of the image). $length = $glyph->length Returns the length of the sequence segment. Retrieving formatting information: $top = $glyph->top $left = $glyph->left $bottom = $glyph->bottom $right = $glyph->right These methods return the top, left, bottom and right of the glyph in pixel coordinates. $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. $scale = $glyph->scale Get the scale for the glyph in pixels/bp. $height = $glyph->labelheight Return the height of the label, if any. $label = $glyph->label Return a human-readable label for the glyph. These methods are called by Ace::Graphics::Track during the layout process: $glyph->move($dx,$dy) Move the glyph in pixel coordinates by the indicated delta-x and delta-y values. ($x1,$y1,$x2,$y2) = $glyph->box Return the current position of the glyph. These methods are intended to be overridden in subclasses: $glyph->calculate_height Calculate the height of the glyph. $glyph->calculate_left Calculate the left side of the glyph. $glyph->calculate_right Calculate the right side of the glyph. $glyph->draw($gd,$left,$top) Optionally offset the glyph by the indicated amount and draw it onto the GD::Image object. $glyph->draw_label($gd,$left,$top) Draw the label for the glyph onto the provided GD::Image object, optionally offsetting by the amounts indicated in $left and $right. These methods are useful utility routines: $pixels = $glyph->map_pt($bases); Map the indicated base position, given in base pair units, into pixels, using the current scale and glyph position. $glyph->filled_box($gd,$x1,$y1,$x2,$y2) Draw a filled rectangle with the appropriate foreground and fill colors, and pen width onto the GD::Image object given by $gd, using the provided rectangle coordinates. $glyph->filled_oval($gd,$x1,$y1,$x2,$y2) As above, but draws an oval inscribed on the rectangle. OPTIONS The following options are standard among all Glyphs. See individual glyph pages for more options. Option Description Default ------ ----------- ------- -fgcolor Foreground color black -outlinecolor black Synonym for -fgcolor -bgcolor Background color white -fillcolor Interior color of filled turquoise images -linewidth Width of lines drawn by 1 glyph -height Height of glyph 10 -font Glyph font gdSmallFont -label Whether to draw a label false You may pass an anonymous subroutine to -label, in which case the subroutine will be invoked with the feature as its single argument. The subroutine must return a string to render as the label. SUBCLASSING Ace::Graphics::Glyph By convention, subclasses are all lower-case. Begin each subclass with a preamble like this one: package Ace::Graphics::Glyph::crossbox; use strict; use vars '@ISA'; @ISA = 'Ace::Graphics::Glyph'; Then override the methods you need to. Typically, just the draw() method will need to be overridden. However, if you need additional room in the glyph, you may override calculate_height(), calculate_left() and calculate_right(). Do not directly override height(), left() and right(), as their purpose is to cache the values returned by their calculating cousins in order to avoid time-consuming recalculation. A simple draw() method looks like this: sub draw { my $self = shift; $self->SUPER::draw(@_); my $gd = shift; # and draw a cross through the box my ($x1,$y1,$x2,$y2) = $self->calculate_boundaries(@_); my $fg = $self->fgcolor; $gd->line($x1,$y1,$x2,$y2,$fg); $gd->line($x1,$y2,$x2,$y1,$fg); } This subclass draws a simple box with two lines criss-crossed through it. We first call our inherited draw() method to generate the filled box and label. We then call calculate_boundaries() to return the coordinates of the glyph, disregarding any extra space taken by labels. We call fgcolor() to return the desired foreground color, and then call $gd->line() twice to generate the criss-cross. For more complex draw() methods, see Ace::Graphics::Glyph::transcript and Ace::Graphics::Glyph::segments.


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Ace::Sequence, Ace::Sequence::Feature, Ace::Graphics::Panel, Ace::Graphics::Track, Ace::Graphics::Glyph::anchored_arrow, Ace::Graphics::Glyph::arrow, Ace::Graphics::Glyph::box, Ace::Graphics::Glyph::primers, Ace::Graphics::Glyph::segments, Ace::Graphics::Glyph::toomany, Ace::Graphics::Glyph::transcript,


Lincoln Stein <>. Copyright (c) 2001 Cold Spring Harbor Laboratory This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See DISCLAIMER.txt for disclaimers of warranty.
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