=head1 NAME

Box2D::b2GearJointDef - Gear joint definition.

=head1 SYNOPSIS

  my $joint_def = Box2D::b2GearJointDef->new();
  $joint_def->bodyA( $body_a );
  $joint_def->bodyB( $body_b );
  $joint_def->joint1( $joint1 );
  $joint_def->joint2( $joint2 );
  $joint_def->ratio( $ratio );
  my $joint = $world->CreateJoint( $joint_def );

=head1 DESCRIPTION

Gear joint definition. This definition requires two existing revolute
or prismatic joints (any combination will work). The provided joints
must attach a dynamic body to a static body.

=head1 METHODS

=head2 new()

Default constructor.

Returns a C<Box2D::b2GearJointDef>

=head2 joint1()

=head2 joint1( $joint1 )

The first revolute/prismatic joint attached to the gear joint.

Parameters:

=over 4

=item * C<Box2D::b2Joint*> C<$joint1> (optional)

=back

Returns a C<Box2D::b2Joint*>

=head2 joint2()

=head2 joint2( $joint2 )

The second revolute/prismatic joint attached to the gear joint.

Parameters:

=over 4

=item * C<Box2D::b2Joint*> C<$joint2> (optional)

=back

Returns a C<Box2D::b2Joint*>

=head2 ratio()

=head2 ratio( $ratio )

The gear ratio.

See also: L<Box2D::b2GearJoint> for explanation.

Parameters:

=over 4

=item * C<float32> C<$ratio> (optional)

=back

Returns a C<float32>

=head1 SEE ALSO

=over 4

=item * L<Box2D>

=item * L<Box2D::b2GearJoint>

=item * L<Box2D::b2JointDef>

=item * L<Box2D::b2World>

=back

=head1 BUGS

See L<Box2D/BUGS>

=head1 AUTHORS

See L<Box2D/AUTHORS>

=head1 COPYRIGHT & LICENSE

See L<Box2D/"COPYRIGHT & LICENSE">

=cut