GD::Text::Wrap(3)
Contents
GD::Text::Wrap - Wrap strings in boxes
use GD;
use GD::Text::Wrap;
my $gd = GD::Image->new(800,600);
# allocate colours, do other things.
my $text = <<EOSTR;
Lorem ipsum dolor sit amet, consectetuer adipiscing elit,
sed diam nonummy nibh euismod tincidunt ut laoreet dolore
magna aliquam erat volutpat.
EOSTR
my $wrapbox = GDTextWrap->new( $gd,
line_space => 4,
color => $black,
text => $text,
);
$wrapbox->set_font(gdMediumBoldFont);
$wrapbox->set_font('arial', 12);
$wrapbox->set(align => 'left', width => 120);
$wrapbox->draw(10,140);
$gd->rectangle($wrap_box->get_bounds(10,140), $color);
GD::Text::Wrap provides an object that draws a formatted
paragraph of text in a box on a GD::Image canvas, using
either a builtin GD font or a TrueType font.
This class doesn't inherit from GD::Text directly, but
delegates most of its work to it (in fact to a
GD::Text::Align object. That means that most of the
GD::Text::Align methods are available for this class,
specifically "set_font" and "font_path". Other methods and
methods with a different interface are described here:
GD::Text::Wrap->new( $gd_object, attribute => value, ... )
Create a new object. The first argument to new has to be a
valid GD::Image object. The other arguments will be passed
to the set() method for initialisation of the attributes.
$wrapbox->set( attribute => value, ... )
set the value for an attribute. Valid attributes are:
width
The width of the box to draw the text in. If unspeci-
fied, they will default to the width of the GD::Image
object.
line_space
The number of pixels between lines. Defaults to 2.
para_space, paragraph_space
The number of extra pixels between paragraphs, above
line_space. Defaults to 0.
color, colour
Synonyms. The colour to use when drawing the font.
Will be initialised to the last colour in the GD
object's palette.
align, alignment
Synonyms. One of 'justified' (the default), 'left',
'right' or 'center'.
text
The text to draw. This is the only attribute that you
absolutely have to set.
preserve_nl
If set to a true value, newlines in the text will
cause a line break. Note that lines will still be
justified. If only one word appears on the line, it
could get ugly. Defaults to 0.
As with the methods, attributes unknown to this class get
delegated to the GD::Text::Align class.
$wrapbox->get( attribute );
Get the current value of an attribute. All attributes men-
tioned under the "set()" method can be retrieved
$wrapbox->get_bounds()
Returns the bounding box of the box that will be drawn
with the current attribute settings as a list. The values
returned are the coordinates of the upper left and lower
right corner.
($left, $top, $right, $bottom) = $wrapbox->get_bounds();
Returns an empty list on error.
NOTE: The return list of this method may change in a
future implementation that allows angled boxes.
$wrapbox->draw(x, y)
Draw the box, with (x,y) as the top right corner. Returns
the same values as the "getbounds()" method.
NOTE: The return list of this method may change in a
future implementation that allows angled boxes.
As with all Modules for Perl: Please stick to using the
interface. If you try to fiddle too much with knowledge of
the internals of this module, you may get burned. I may
change them at any time.
You can only use TrueType fonts with version of GD > 1.20,
and then only if compiled with support for this. If you
attempt to do it anyway, you will get errors.
Even though this module lives in the GD::Text namespace,
it is not a GD::Text. It does however delegate a lot of
its functionality to a contained object that is one
(GD::Text::Align).
None that I know of, but that doesn't mean much. There may
be some problems with exotic fonts, or locales and charac-
ter encodings that I am not used to.
Angled boxes.
At the moment, the only bit of the box that is allowed to
be unspecified and in fact must be unspecified, is the
bottom. If there is enough need for it, I might implement
more flexibility, in that that you need to only specify
three of the four sides of the box, and the fourth will be
calculated.
Automatic resizing of a TrueType font to fit inside a box
when four sides are specified, or maybe some other nifty
things.
More flexibility in the interface. Especially draw needs
some thought.
More and better error handling.
Warnings for lines that are too long and stick out of the
box. Warning for emptyish lines?
copyright 1999 Martien Verbruggen (mgjv@comdyn.com.au)
GD, GD::Text, GD::Text::Align
perl v5.8.0 2003-02-24 Text::Wrap(3)
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