def test_round_down_significant(self):
# (input) (expected output)
values = [((1, 1), 1),
((-1.234, 1), -1),
((-1234, 1), -1000),
((1600, 1), 1000),
((-1600, 1), -1000),
((0.0001236, 3), 0.000123),
((0, 5), 0),
]
for (i, eo) in values:
o = units.round_down_significant(*i)
self.assertEquals(o, eo,
"%f to %d figures = %f should be %f" % (i[0], i[1], o, eo))
def GetLineWidth(self, dc):
"""
Returns the size in pixel of the scale line and its actual size.
The pixel size is always less than the width of the window minus margin
minus space for 8 characters
dc (wx.DC)
return 2-tuple (int, float): pixel size, actual size (meter)
"""
size = self.GetClientSize()
maxWidth = size[0] - self.shift - dc.GetTextExtent(" 000mm")[0]
maxWidth = max(1, maxWidth)
maxActualWidth = maxWidth * self.mpp
actualWidth = units.round_down_significant(maxActualWidth, self.significant)
width = int(actualWidth / self.mpp)
return (width, actualWidth)