62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
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from PyQt5 import QtCore, QtGui, QtWidgets
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__all__ = ['QFloatSlider']
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class QFloatSlider(QtWidgets.QSlider):
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"""
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Subclass of QtWidgets.QSlider
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Horizontal slider giving floating point values.
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Usage: QFloatSlider(min, max, step, default)
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where min = minimum value of slider
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max = maximum value of slider
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step = interval between values. Must be a factor of (max-min)
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default = default (starting) value of slider
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"""
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def __init__(self, min_value, max_value, step, default):
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super().__init__(QtCore.Qt.Horizontal)
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self.precision = 0.001
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self.min_value = min_value
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self.max_value = max_value
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self.step = step
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self.default = default
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self.quotient, self.remainder = self._float_divmod(\
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self.max_value-self.min_value, self.step)
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if self.remainder:
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raise ValueError("{} does not fit evenly between {} and {}"\
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.format(step, min_value, max_value))
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super().setMinimum(0)
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super().setMaximum(self.quotient)
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super().setSingleStep(1)
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super().setValue(self._float_to_int(self.default))
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super().valueChanged.connect(self._value_handler)
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self.slider_value = 2.0
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# This is mostly disgusting python i hate floating points >:(
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def _float_divmod(self,a,b):
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"""
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Basically the divmod function but it works for floats (try 0.3 % 0.1 smh)
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Returns the quotient, and a remainder.
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"""
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a = abs(a)
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b = abs(b)
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n = 1
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while True:
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c = a - b
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c = abs(c)
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if c < self.precision:
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return (n, 0)
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elif c > a:
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return (n-1, a)
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a = c
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n += 1
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def _float_to_int(self, a):
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return int(round(a/self.step))
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def _int_to_float(self, a):
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return self.min_value+a*self.step
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def _value_handler(self):
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self.slider_value = self._int_to_float(super().value())
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