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.. include:: headings.inc

.. currentmodule:: wx.lib.ogl.composit

.. highlight:: python



.. _wx.lib.ogl.composit.Constraint:

==========================================================================================================================================
|phoenix_title|  **wx.lib.ogl.composit.Constraint**
==========================================================================================================================================

The :class:`Constraint` class helps specify how child shapes are laid out
with respect to siblings and parents.



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|class_hierarchy| Class Hierarchy
=================================

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   Inheritance diagram for class <strong>Constraint</strong>:
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|sub_classes| Known Subclasses
==============================

:class:`wx.core.Constraint`

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|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.lib.ogl.composit.Constraint.__init__`                                 Default class constructor.
:meth:`~wx.lib.ogl.composit.Constraint.Equals`                                   Return `True` if a and b are approximately equal (for the purposes
:meth:`~wx.lib.ogl.composit.Constraint.Evaluate`                                 Evaluate this constraint and return `True` if anything changed.
:meth:`~wx.lib.ogl.composit.Constraint.SetSpacing`                               Sets the horizontal and vertical spacing for the constraint.
================================================================================ ================================================================================


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|api| Class API
===============


.. class:: Constraint(object)

   The :class:`Constraint` class helps specify how child shapes are laid out
   with respect to siblings and parents.

   .. method:: __init__(self, type, constraining, constrained)

      Default class constructor.
      
      :param `type`: see :class:`ConstraintType` for valid types
      :param `constraining`: the constraining :class:`Shape`
      :param `constrained`: the constrained :class:`Shape`


   .. method:: Equals(self, a, b)

      Return `True` if a and b are approximately equal (for the purposes
      of evaluating the constraint).
      
      :param `a`: ???
      :param `b`: ???


   .. method:: Evaluate(self)

      Evaluate this constraint and return `True` if anything changed.


   .. method:: SetSpacing(self, x, y)

      Sets the horizontal and vertical spacing for the constraint.
      
      :param `x`: the x position
      :param `y`: the y position


