[Zope3-checkins] CVS: Products3/pypgsqlda/interfaces - geometric.py:1.1

[Christian Theune]

Update of /cvs-repository/Products3/pypgsqlda/interfaces
In directory cvs.zope.org:/tmp/cvs-serv662/interfaces

Added Files:
	geometric.py 
Log Message:
first draft of geometric interfaces


=== Added File Products3/pypgsqlda/interfaces/geometric.py ===
##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Geometric object interfaces.

$Id: geometric.py,v 1.1 2003/03/18 22:19:07 ctheune Exp $
"""

from zope.interface import Interface, Attribute

class Point:
    """A 2 dimensional point in cartesian representation."""

    x = Attribute("x coordinate as float")
    y = Attribute("y coordinate as float")

class Shape:
    """An abstract interface for geometric shapes."""

    def area():
        pass
        
    def circumference():
        pass
    

class Circle(Shape):
    """A circle. It is represented as a center point and a radius."""

    center = Attribute("center as point coordinate")
    radius = Attribute("radius as float")

class Box(Shape):

    upperRight = Attribute("Upper right point of the box as point coordinate")
    lowerLeft = Attribute("Lower left point of the box as point coordinate")

class Path:
    """A path is an ordered set of points. A path can be closed, which means
       that the end point is connected to the start point. A special kind of
       path is the line, which only has to points and is open."""
    
    points = Attribute("List of coordinate points")
    open = Attribute("Is the last point connected to the first?")