=head1 NAME
Box2D::b2Fixture - Used to attach a shape to a body for collision detection.
=head1 SYNOPSIS
my $fixture = $body->CreateFixture( $shape, $density );
=head1 DESCRIPTION
A fixture is used to attach a shape to a body for collision detection.
A fixture inherits its transform from its parent. Fixtures hold
additional non-geometric data such as friction, collision filters, etc.
Fixtures are created via C<Box2D::b2Body::CreateFixture>.
Warning: you cannot reuse fixtures.
=head1 METHODS
=head2 GetBody()
Get the parent body of this fixture. This is NULL if the fixture is not
attached.
Returns a C<Box2D::b2Body> - the parent body.
=head2 GetDensity()
Get the density of this fixture.
Returns a C<float32>
=head2 GetFriction()
Get the coefficient of friction.
Returns a C<float32>
=head2 GetNext()
Get the next fixture in the parent body's fixture list.
Returns a C<Box2D::b2Fixture> - the next shape.
=head2 GetRestitution()
Get the coefficient of restitution.
Returns a C<float32>
=head2 GetShape()
Get the child shape. You can modify the child shape, however you should
not change the number of vertices because this will crash some
collision caching mechanisms. Manipulating the shape may lead to
non-physical behavior.
Returns a C<Box2D::b2Shape>
=head2 GetUserData()
Get the user data that was assigned in the fixture definition. Use this
to store your application specific data.
Returns a C<scalar>
=head2 IsSensor()
Is this fixture a sensor (non-solid)?
Returns a C<bool> - the true if the shape is a sensor.
=head2 SetDensity( $density )
Set the density of this fixture. This will _not_ automatically adjust
the mass of the body. You must call C<Box2D::b2Body::ResetMassData> to
update the body's mass.
Parameters:
=over 4
=item * C<float32> C<$density>
=back
=head2 SetFriction( $friction )
Set the coefficient of friction.
Parameters:
=over 4
=item * C<float32> C<$friction>
=back
=head2 SetRestitution( $restitution )
Set the coefficient of restitution.
Parameters:
=over 4
=item * C<float32> C<$restitution>
=back
=head2 SetSensor( $sensor )
Set if this fixture is a sensor.
Parameters:
=over 4
=item * C<bool> C<$sensor>
=back
=head2 SetUserData( $data )
Set the user data. Use this to store your application specific data.
Parameters:
=over 4
=item * C<scalar> C<$data>
=back
=head2 TestPoint( $p )
Test a point for containment in this fixture.
Parameters:
=over 4
=item * C<Box2D::b2Vec2> C<$p> - a point in world coordinates.
=back
Returns a C<bool>
=head1 SEE ALSO
=over 4
=item * L<Box2D>
=item * L<Box2D::b2Body>
=item * L<Box2D::b2Shape>
=back
=head1 BUGS
See L<Box2D/BUGS>
=head1 AUTHORS
See L<Box2D/AUTHORS>
=head1 COPYRIGHT & LICENSE
See L<Box2D/"COPYRIGHT & LICENSE">
=cut