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# -*- coding: utf-8 -*-
#
# Licensed under the terms of the Qwt License
# Copyright (c) 2002 Uwe Rathmann, for the original C++ code
# Copyright (c) 2015 Pierre Raybaut, for the Python translation/optimization
# (see LICENSE file for more details)
import math
from qtpy.QtCore import qFuzzyCompare
def qwtFuzzyCompare(value1, value2, intervalSize):
eps = abs(1.0e-6 * intervalSize)
if value2 - value1 > eps:
return -1
elif value1 - value2 > eps:
return 1
else:
return 0
def qwtFuzzyGreaterOrEqual(d1, d2):
return (d1 >= d2) or qFuzzyCompare(d1, d2)
def qwtFuzzyLessOrEqual(d1, d2):
return (d1 <= d2) or qFuzzyCompare(d1, d2)
def qwtSign(x):
if x > 0.0:
return 1
elif x < 0.0:
return -1
else:
return 0
def qwtSqr(x):
return x**2
def qwtFastAtan(x):
if x < -1.0:
return -0.5 * math.pi - x / (x**2 + 0.28)
elif x > 1.0:
return 0.5 * math.pi - x / (x**2 + 0.28)
else:
return x / (1.0 + x**2 * 0.28)
def qwtFastAtan2(y, x):
if x > 0:
return qwtFastAtan(y / x)
elif x < 0:
d = qwtFastAtan(y / x)
if y >= 0:
return d + math.pi
else:
return d - math.pi
elif y < 0.0:
return -0.5 * math.pi
elif y > 0.0:
return 0.5 * math.pi
else:
return 0.0
def qwtRadians(degrees):
return degrees * math.pi / 180.0
def qwtDegrees(radians):
return radians * 180.0 / math.pi
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