Imager::Transform(3pm)					User Contributed Perl Documentation				    Imager::Transform(3pm)

NAME

	 Imager::Transform - a library of register machine image transformations

SYNOPSIS

	 # get a list of transformations
	 my @funcs = Imager::Transform->list;
	 # create a transformation object
	 my $tran = Imager::Transform->new($name);
	 # describe it
	 print $tran->describe;
	 # a list of constant names
	 my @constants = $tran->constants;
	 # information about some of the constants
	 my @info = $tran->constants(@constants);

DESCRIPTION

       This module provides a library of transformations that use the Imager transform2() function.

       The aim is to provide a place to collect these transformations.

       At some point there might be an interface to add new functions, but there's not a whole lot of point to that.

       The interface is a little sparse as yet.

METHODS

       my @names = Imager::Transform->list
	   Returns a list of the transformations.

       my $desc = Imager::Transform->describe($name);
       my $desc = $tran->describe()
	   Describes a transformation specified either by name (as a class method) or by reference (as an instance method).

	   The class method returns undef if there is no such transformation.

       my $tran = Imager::Transform->new($name)
	   Create a new transformation object.	Returns undef if there is no such transformation.

       my @inputs = $tran->inputs;
       my $inputs = $tran->inputs;
	   Returns a list of input image descriptions, or the number of them, depending on content.

	   The list contains hash references, which current contain only one member, "desc", a description of the use of the input image.

       $tran->constants
	   Returns a list of names of constants that can be set for the transformation.

       $tran->constants($name, $name, ...)
	   Returns a hashref for each named constant, which contains the default in key "default" and a description in key "desc".

       my $out = $tran->transform(\%opts, \%constants, @imgs)
	   Perform the image transformation.

	   Returns the new image on success, or undef on failure, in which case you can use $tran->errstr to get an error message.

       $tran->errstr
	   The error message, if any from the last image transformation.

BUGS

       Needs more transformations.

SEE ALSO

       Imager(3), transform.perl

perl v5.14.2							    2011-06-06						    Imager::Transform(3pm)