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/usr/lib/python2.7/dist-packages/pyqtgraph/Point.py is in python-pyqtgraph 0.10.0-1.

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# -*- 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 .Qt import QtCore
import numpy as np

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 isinstance(args[0], QtCore.QSizeF):
                QtCore.QPointF.__init__(self, float(args[0].width()), float(args[0].height()))
                return
            elif isinstance(args[0], float) or isinstance(args[0], int):
                QtCore.QPointF.__init__(self, float(args[0]), float(args[0]))
                return
            elif hasattr(args[0], '__getitem__'):
                QtCore.QPointF.__init__(self, float(args[0][0]), float(args[0][1]))
                return
        elif len(args) == 2:
            QtCore.QPointF.__init__(self, args[0], args[1])
            return
        QtCore.QPointF.__init__(self, *args)
        
    def __len__(self):
        return 2
        
    def __reduce__(self):
        return (Point, (self.x(), self.y()))
        
    def __getitem__(self, i):
        if i == 0:
            return self.x()
        elif i == 1:
            return self.y()
        else:
            raise IndexError("Point has no index %s" % str(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 %s" % str(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 __truediv__(self, a):
        return self._math_('__truediv__', a)
    
    def __rtruediv__(self, a):
        return self._math_('__rtruediv__', 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:
            #fn  = getattr(QtCore.QPointF, op)
            #pt = fn(self, x)
            #print fn, pt, self, x
            #return Point(pt)
        #except AttributeError:
        x = Point(x)
        return Point(getattr(self[0], op)(x[0]), getattr(self[1], op)(x[1]))
    
    def length(self):
        """Returns the vector length of this Point."""
        return (self[0]**2 + self[1]**2) ** 0.5
    
    def norm(self):
        """Returns a vector in the same direction with unit length."""
        return self / self.length()
    
    def angle(self, a):
        """Returns the angle in degrees between this vector and the vector a."""
        n1 = self.length()
        n2 = a.length()
        if n1 == 0. or n2 == 0.:
            return None
        ## Probably this should be done with arctan2 instead..
        ang = np.arccos(clip(self.dot(a) / (n1 * n2), -1.0, 1.0)) ### in radians
        c = self.cross(a)
        if c > 0:
            ang *= -1.
        return ang * 180. / np.pi
    
    def dot(self, a):
        """Returns the dot product of a and this Point."""
        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 proj(self, b):
        """Return the projection of this vector onto the vector b"""
        b1 = b / b.length()
        return self.dot(b1) * b1
    
    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])
        
    def copy(self):
        return Point(self)
        
    def toQPoint(self):
        return QtCore.QPoint(*self)