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same as C<levels>, but get/sets durations for segments

=head2 dur($pos, [$level])

get/set dur at position

=head2 curves([@new_curves])

same as durs, but for curves

=head2 curve($pos, [$level])

get/set curvative at position

=head2 border_level([$begin,$end])

should be in range [0,1], can be array ref or single value for equal levels at begin/end of envelope

this will work only when passed to constructor to create random envelope, e.g.

   Math::SegmentedEnvelope->new(border_level => [0.5,0.2])

=head1 FUNCTIONS

=over

=item env(constructor params)

handy function which will construct object from passed params, e.g.

   use Math::SegmentedEnvelope 'env';
   my @arr = map { env } 0..9; # @arr now contains 10 random envelope objects

alternatively you can use modules such as L<aliased>, L<as>

=back

=head1 EXAMPLES

=over

=item Plot

   use PDL::Graphics::Prima::Simple;
   use Math::SegmentedEnvelope;
   my $e = Math::SegmentedEnvelope->new(is_morph => 1);
   my $t = $e->table(4096);
   line_plot($t);
   
=item Interpolate

   use PDL;
   interpolate(rand(4095), sequence(4096), pdl($t)); # interpolate at random position 

=item Animation

   use AnyEvent; # and/or Coro
   my $e = Math::SegmentedEnvelope->new(is_morph => 1);
   my $v = 0; # some property
   my $w = AE::timer(0, 1/60, sub { # refresh $v with 60Hz rate
        state $s = $e->static; # get static evaluator
        state $started = AE::now;
        $v = $s->(AE::now - $started); # or $e->at(..) if $e can be altered somewhere
   });
   my $k = AE::timer(10, 0, sub { undef $w }); # kill previous timer after 10secs
   my $i = AE::idle(sub { ... }); # animate $v using OpenGL, SDL and etc..
   AE::cv->recv;


=item visual representation of arbitrary definition

      Math::SegmentedEnvelope->new([[0,1,0.5,0],[0.5,0.5,1],[-3,1/3,4]], is_morph => 1)

=begin HTML
 
<p><img src="http://i.imgur.com/Dsqaq.png" width="478" height="263" alt="envelope example" /></p>
 
=end HTML

=back

=head1 SUPPORT

=over

=item * GitHub
 
L<http://github.com/vividsnow/Math-SegmentedEnvelope>
 
=item * Search MetaCPAN
 
L<https://metacpan.org/module/Math::SegmentedEnvelope>
 
=back
 
=head1 ACKNOWLEDGEMENTS
 
L<SuperCollider|https://supercollider.sourceforge.net>, L<Moo>
 
=head1 AUTHOR
 
Yegor Korablev <egor@cpan.org>
 
=head1 LICENSE
 
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
 
=head1 SEE ALSO
 
L<PDL>, L<Math::Fractal::Noisemaker>, L<Math::NumSeq>, L<Math::PlanePath>, L<OpenGL>, L<SDL>, L<AnyEvent>

=head1 TODO

blending,stacking,duration scaling,delaying,inverting and some common predefined envelopes
more docs,tests and examples
 
=cut