def avMPP(self, value):
# TODO: shall we use the real density of the screen?
# We could use real density but how much important is it?
mppScreen = 0.00025 # 0.25 mm/px
label = "Mag: "
if self.inimage.mpp:
magIm = mppScreen / self.inimage.mpp # as if 1 im.px == 1 sc.px
if magIm >= 1:
label += "×" + str(units.round_significant(magIm, 3))
else:
label += "/" + str(units.round_significant(1.0/magIm, 3))
magDig = self.inimage.mpp / self.viewmodel.mpp.value
if magDig >= 1:
label += " ×" + str(units.round_significant(magDig, 3))
else:
label += " /" + str(units.round_significant(1.0/magDig, 3))
self.LegendMag.SetLabel(label)
if self.sizer:
self.sizer.Layout()
def test_round_significant(self):
# (input) (expected output)
values = [((1, 1), 1),
((-1.234, 1), -1),
((-1234, 1), -1000),
((1600, 1), 2000),
((-1600, 1), -2000),
((0.0001236, 3), 0.000124),
((0, 5), 0),
]
for (i, eo) in values:
o = units.round_significant(*i)
self.assertEquals(o, eo,
"%f to %d figures = %f should be %f" % (i[0], i[1], o, eo))
