pyqtgraph/Point.py

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2010-03-22 05:48:52 +00:00
# -*- coding: utf-8 -*-
"""
Point.py - Extension of QPointF which adds a few missing methods.
Copyright 2010 Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more infomation.
"""
from PyQt4 import QtCore
from math import acos
def clip(x, mn, mx):
if x > mx:
return mx
if x < mn:
return mn
return x
class Point(QtCore.QPointF):
"""Extension of QPointF which adds a few missing methods."""
def __init__(self, *args):
if len(args) == 1:
if hasattr(args[0], '__getitem__'):
QtCore.QPointF.__init__(self, float(args[0][0]), float(args[0][1]))
return
elif type(args[0]) in [float, int]:
QtCore.QPointF.__init__(self, float(args[0]), float(args[0]))
return
elif len(args) == 2:
QtCore.QPointF.__init__(self, args[0], args[1])
return
QtCore.QPointF.__init__(self, *args)
def __getitem__(self, i):
if i == 0:
return self.x()
elif i == 1:
return self.y()
else:
raise IndexError("Point has no index %d" % i)
def __setitem__(self, i, x):
if i == 0:
return self.setX(x)
elif i == 1:
return self.setY(x)
else:
raise IndexError("Point has no index %d" % i)
def __radd__(self, a):
return self._math_('__radd__', a)
def __add__(self, a):
return self._math_('__add__', a)
def __rsub__(self, a):
return self._math_('__rsub__', a)
def __sub__(self, a):
return self._math_('__sub__', a)
def __rmul__(self, a):
return self._math_('__rmul__', a)
def __mul__(self, a):
return self._math_('__mul__', a)
def __rdiv__(self, a):
return self._math_('__rdiv__', a)
def __div__(self, a):
return self._math_('__div__', a)
def __rpow__(self, a):
return self._math_('__rpow__', a)
def __pow__(self, a):
return self._math_('__pow__', a)
def _math_(self, op, x):
#print "point math:", op
try:
return Point(getattr(QtCore.QPointF, op)(self, x))
except:
x = Point(x)
return Point(getattr(self[0], op)(x[0]), getattr(self[1], op)(x[1]))
def length(self):
return (self[0]**2 + self[1]**2) ** 0.5
def angle(self, a):
n1 = self.length()
n2 = a.length()
if n1 == 0. or n2 == 0.:
return None
ang = acos(clip(self.dot(a) / (n1 * n2), -1.0, 1.0))
c = self.cross(a)
if c > 0:
ang *= -1.
return ang
def dot(self, a):
a = Point(a)
return self[0]*a[0] + self[1]*a[1]
def cross(self, a):
a = Point(a)
return self[0]*a[1] - self[1]*a[0]
def __repr__(self):
return "Point(%f, %f)" % (self[0], self[1])
def min(self):
return min(self[0], self[1])
def max(self):
return max(self[0], self[1])