128 lines
3.6 KiB
Python
128 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Point.py - Extension of QPointF which adds a few missing methods.
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Copyright 2010 Luke Campagnola
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Distributed under MIT/X11 license. See license.txt for more infomation.
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"""
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from PyQt4 import QtCore
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from math import acos
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def clip(x, mn, mx):
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if x > mx:
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return mx
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if x < mn:
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return mn
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return x
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class Point(QtCore.QPointF):
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"""Extension of QPointF which adds a few missing methods."""
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def __init__(self, *args):
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if len(args) == 1:
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if isinstance(args[0], QtCore.QSizeF):
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QtCore.QPointF.__init__(self, float(args[0].width()), float(args[0].height()))
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return
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elif hasattr(args[0], '__getitem__'):
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QtCore.QPointF.__init__(self, float(args[0][0]), float(args[0][1]))
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return
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elif type(args[0]) in [float, int]:
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QtCore.QPointF.__init__(self, float(args[0]), float(args[0]))
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return
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elif len(args) == 2:
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QtCore.QPointF.__init__(self, args[0], args[1])
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return
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QtCore.QPointF.__init__(self, *args)
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def __reduce__(self):
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return (Point, (self.x(), self.y()))
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def __getitem__(self, i):
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if i == 0:
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return self.x()
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elif i == 1:
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return self.y()
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else:
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raise IndexError("Point has no index %d" % i)
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def __setitem__(self, i, x):
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if i == 0:
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return self.setX(x)
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elif i == 1:
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return self.setY(x)
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else:
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raise IndexError("Point has no index %d" % i)
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def __radd__(self, a):
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return self._math_('__radd__', a)
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def __add__(self, a):
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return self._math_('__add__', a)
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def __rsub__(self, a):
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return self._math_('__rsub__', a)
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def __sub__(self, a):
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return self._math_('__sub__', a)
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def __rmul__(self, a):
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return self._math_('__rmul__', a)
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def __mul__(self, a):
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return self._math_('__mul__', a)
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def __rdiv__(self, a):
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return self._math_('__rdiv__', a)
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def __div__(self, a):
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return self._math_('__div__', a)
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def __rpow__(self, a):
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return self._math_('__rpow__', a)
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def __pow__(self, a):
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return self._math_('__pow__', a)
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def _math_(self, op, x):
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#print "point math:", op
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try:
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return Point(getattr(QtCore.QPointF, op)(self, x))
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except:
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x = Point(x)
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return Point(getattr(self[0], op)(x[0]), getattr(self[1], op)(x[1]))
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def length(self):
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"""Returns the vector length of this Point."""
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return (self[0]**2 + self[1]**2) ** 0.5
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def angle(self, a):
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"""Returns the angle between this vector and the vector a."""
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n1 = self.length()
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n2 = a.length()
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if n1 == 0. or n2 == 0.:
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return None
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## Probably this should be done with arctan2 instead..
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ang = acos(clip(self.dot(a) / (n1 * n2), -1.0, 1.0)) ### in radians
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c = self.cross(a)
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if c > 0:
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ang *= -1.
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return ang
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def dot(self, a):
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"""Returns the dot product of a and this Point."""
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a = Point(a)
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return self[0]*a[0] + self[1]*a[1]
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def cross(self, a):
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a = Point(a)
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return self[0]*a[1] - self[1]*a[0]
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def __repr__(self):
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return "Point(%f, %f)" % (self[0], self[1])
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def min(self):
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return min(self[0], self[1])
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def max(self):
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return max(self[0], self[1]) |