100 lines
3.6 KiB
Python
100 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Vector.py - Extension of QVector3D 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 information.
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"""
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from math import acos, degrees
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from .Qt import QtGui, QtCore, QT_LIB
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from . import functions as fn
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class Vector(QtGui.QVector3D):
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"""Extension of QVector3D which adds a few helpful methods."""
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def __init__(self, *args):
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"""
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Handle additional constructions of a Vector
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============== ================================================================================================
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**Arguments:**
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*args* Could be any of:
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* 3 numerics (x, y, and z)
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* 2 numerics (x, y, and `0` assumed for z)
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* Either of the previous in a list-like collection
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* 1 QSizeF (`0` assumed for z)
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* 1 QPointF (`0` assumed for z)
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* Any other valid QVector3D init args.
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============== ================================================================================================
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"""
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initArgs = args
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if len(args) == 1:
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if isinstance(args[0], QtCore.QSizeF):
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initArgs = (float(args[0].width()), float(args[0].height()), 0)
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elif isinstance(args[0], QtCore.QPoint) or isinstance(args[0], QtCore.QPointF):
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initArgs = (float(args[0].x()), float(args[0].y()), 0)
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elif hasattr(args[0], '__getitem__') and not isinstance(args[0], QtGui.QVector3D):
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vals = list(args[0])
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if len(vals) == 2:
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vals.append(0)
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if len(vals) != 3:
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raise Exception('Cannot init Vector with sequence of length %d' % len(args[0]))
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initArgs = vals
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elif len(args) == 2:
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initArgs = (args[0], args[1], 0)
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QtGui.QVector3D.__init__(self, *initArgs)
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def __len__(self):
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return 3
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def __add__(self, b):
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# workaround for pyside bug. see https://bugs.launchpad.net/pyqtgraph/+bug/1223173
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if QT_LIB == 'PySide' and isinstance(b, QtGui.QVector3D):
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b = Vector(b)
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return QtGui.QVector3D.__add__(self, b)
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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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elif i == 2:
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return self.z()
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else:
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raise IndexError("Point has no index %s" % str(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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elif i == 2:
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return self.setZ(x)
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else:
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raise IndexError("Point has no index %s" % str(i))
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def __iter__(self):
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yield(self.x())
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yield(self.y())
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yield(self.z())
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def angle(self, a):
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"""Returns the angle in degrees 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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rads = acos(fn.clip_scalar(QtGui.QVector3D.dotProduct(self, a) / (n1 * n2), -1.0, 1.0)) ### in radians
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# c = self.crossProduct(a)
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# if c > 0:
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# ang *= -1.
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return degrees(rads)
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def __abs__(self):
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return Vector(abs(self.x()), abs(self.y()), abs(self.z()))
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