43 lines
1.6 KiB
Python
43 lines
1.6 KiB
Python
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class Point(tuple):
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'''Represents an (x,y) coordinate'''
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def __new__(cls, x, y):
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return tuple.__new__(cls, (y, x))
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def __getattr__(self, name):
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if name == "x":
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return self[1]
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elif name == 'y':
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return self[0]
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else:
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raise AttributeError
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def __repr__(self):
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return '<Point(%d, %d)>' % (self[1], self[0])
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def __str__(self):
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return '(%d,%d)' % (self[1], self[0])
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def xy(self):
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'''Returns a tuple (x,y)'''
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return (self[1], self[0])
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def yx(self):
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'''Returns a tuple (x,y)'''
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return tuple(self)
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def add(self, xdelta, ydelta):
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'''Returns a new point, adding xdelta and ydelta'''
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return Point(self[1] + xdelta, self[0] + ydelta)
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def vadd(self, xdelta, ydelta):
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'''Returns a new point. If ydelta != 0, xdelta is absolute; otherwise, xdelta is relative'''
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assert xdelta >= 0 and ydelta >= 0, str((xdelta, ydelta))
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if ydelta != 0:
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return Point(xdelta, self[0] + ydelta)
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else:
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return Point(self[1] + xdelta, self[0])
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#def sub(self, xdelta, ydelta):
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# '''Returns a new point, subtracing xdelta and ydelta'''
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# return Point(self[1] - xdelta, self[0] - ydelta)
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#def vsub(self, xdelta, ydelta):
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# '''Returns a new point. If ydelta != 0, xdelta is absolute; otherwise, xdelta is relative'''
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# assert xdelta >= 0 and ydelta >= 0, str((xdelta, ydelta))
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# if ydelta != 0:
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# return Point(self[1], self[0] - ydelta)
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# else:
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# return Point(self[1] - xdelta, self[0])
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