/usr/lib/python2.7/dist-packages/chaco/scales/scales_test_case.py is in python-chaco 4.4.1-1.2.
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from numpy import array
from formatters import BasicFormatter, OffsetFormatter
from scales import Pow10Scale, FixedScale, LogScale, DefaultScale, ScaleSystem, frange
class TicksTestCase(unittest.TestCase):
""" Base class for scale and scale system unit tests """
def assert_empty(self, arg):
self.assert_(len(arg) == 0)
def check_ticks(self, ticks1, ticks2):
self.assertEqual(len(ticks1),len(ticks2))
for t1, t2 in zip(ticks1, ticks2):
self.assertAlmostEqual(t1, t2, 6)
def check_labels(self, labels1, labels2):
self.assertEqual(len(labels1),len(labels2))
for t1, t2, in zip(labels1, labels2):
self.assert_(t1 == t2)
class ScalesTestCase(TicksTestCase):
def test_pow10(self):
scale = Pow10Scale()
ticks = scale.ticks(5,15,8)
self.check_ticks(ticks, frange(5, 15, 1.0))
ticks = scale.ticks(5,105,8)
self.check_ticks(ticks, frange(10, 100, 10.0))
def test_log_scale_subdecade(self):
# Test cases where log_interval is less than 1.
scale = LogScale()
ticks = scale.ticks(1.0, 2.0)
self.check_ticks(ticks, array((1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0)))
ticks = scale.ticks(0.9,2.1)
self.check_ticks(ticks, array((1.0, 1.25, 1.5, 1.75, 2.0)))
ticks = scale.ticks(1.1,9.9)
self.check_ticks(ticks, array((2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0)))
def test_log_scale_interval1(self):
# Test the case where 1 < log_interval < desired_ticks, and interval=1
# is the case that generates the ticks.
scale = LogScale()
ticks = scale.ticks(1.0,10.1)
self.check_ticks(ticks, array((1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0)))
ticks = scale.ticks(9.3,99.9)
self.check_ticks(ticks, array((10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0)))
ticks = scale.ticks(9.9,100.0)
self.check_ticks(ticks, array((10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0)))
def test_log_scale(self):
scale = LogScale()
ticks = scale.ticks(0.1, 10.0)
self.check_ticks(ticks, array((0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 4.0, 6.0, 8.0, 10.0)))
ticks = scale.ticks(10.0, 1000.0)
self.check_ticks(ticks, array((10.0, 20.0, 40.0, 60.0, 80.0, 100.0,
200.0, 400.0, 600.0, 800.0, 1000.0)))
ticks = scale.ticks(9.9, 1000.0)
self.check_ticks(ticks, array((10.0, 20.0, 40.0, 60.0, 80.0, 100.0,
200.0, 400.0, 600.0, 800.0, 1000.0)))
ticks = scale.ticks(5.0, 4300)
self.check_ticks(ticks, array((5, 10, 50, 100, 500, 1000)))
# Test case when the log_interval is greater than 8 (the
# default desired_ticks)
ticks = scale.ticks(1e-3,1e6)
self.check_ticks(ticks, array((1e-3, 1e-2, 1e-1, 1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6)))
class ScaleSystemTestCase(TicksTestCase):
def test_defaults(self):
ticker = ScaleSystem()
ticks = ticker.ticks(5, 30, 10)
self.check_ticks(ticks, frange(5.0, 30.0, 2.5))
def test_fixed_scales(self):
scales = [FixedScale(resolution = 1.0),
FixedScale(resolution = 10.0),
FixedScale(resolution = 100.0)]
ticker = ScaleSystem(default_scale=None, *scales)
self.check_ticks(ticker.ticks(5, 35, 3), (10.0, 20.0, 30.0))
self.check_ticks(ticker.ticks(5, 35, 20), frange(5.0, 35.0, 1.0))
self.check_ticks(ticker.ticks(5, 614, 10), (100, 200, 300, 400, 500, 600))
def test_revert_to_default(self):
scales = [FixedScale(resolution = 1.0),
FixedScale(resolution = 10.0),
FixedScale(resolution = 100.0)]
ticker = ScaleSystem(*scales)
ticks = ticker.ticks(2.0, 3.0, 10)
self.check_ticks(ticks, frange(2.0, 3.0, 0.1))
def test_translation(self):
pass
class BasicFormatterTestCase(TicksTestCase):
def test_format(self):
fmt = BasicFormatter()
# test with a fixed scale
scale = FixedScale(resolution = 1.0)
start, end = 12.0, 18.0
numlabels = 8
ticks = scale.ticks(start, end, numlabels)
labels = fmt.format(ticks, numlabels, None)
# desired = [str(float(x)) for x in range(12, 19)]
## This test fails when desired is created with str(float(x)).
## The format function returns "12",...,"18", not "12.0",...,"18.0".
desired = ["12","13","14","15","16","17","18"]
self.check_labels(labels, desired)
def test_format_small_numbers(self):
fmt = BasicFormatter()
numlabels = 8
# test with small numbers
scale = FixedScale(resolution = 1e-4)
start, end = 5e-5, 8.5e-4
ticks = scale.ticks(start, end, numlabels)
labels = fmt.format(ticks, numlabels, None)
desired = [str(float(i))+"e-4" for i in range(1, 9)]
self.check_labels(labels, desired)
def test2_nice_sci(self):
# The table of numerical values and their proper representation
# given a certain number of mantissa digits
vals = [ (3.14159e10, (2, "3e10"), (3, '3.1e10'), (5, '3.141e10')),
(123456789, (3, '1.2e8'), (5, '1.234e8')),
(-123456, (2, "-1e5"), (3, "-1e5"), (4, "-1.2e5")),
(123, (2, "1e2"), (3, "1.2e2"), (4, "1.23e2")),
(1.234, (2, "1"), (3, "1.2"), (4, "1.23")),
]
fmt = BasicFormatter()
for lst in vals:
val = lst[0]
for mdigits, desired in lst[1:]:
s = fmt._nice_sci(val, mdigits)
if s != desired:
print "Mismatch for", val, "; desired:", desired, "actual:", s
def test_estimate_default_scale(self):
fmt = BasicFormatter()
scale = DefaultScale()
# Test using numlabels
test_intervals = ((12., 18., 8),
(-4., 16., 10),
(5e-5, 8.5e-4, 8),
(3e8, 6e8, 8),
)
for start, end, numlabels in test_intervals:
estimate = fmt.estimate_width(start, end, numlabels, ticker=scale)[1]
ticks = scale.ticks(start, end, numlabels)
labels = fmt.format(ticks, numlabels, None)
actual = sum(map(len, labels))
err = abs(estimate - actual) / actual
self.assertLess(err, 0.5)
return
def test_width_based_default_scale(self):
scale = ScaleSystem()
test_intervals = ((1, 100, 80),
(1, 100, 40),
(1, 100, 20),)
print
for start, end, width in test_intervals:
labels = scale.labels(start, end, char_width=width)
print "(%d,%d)" % (start,end), " avail:", width,
print " used:", sum([len(x[1]) for x in labels])
return
def test_scale_system(self):
scale = ScaleSystem(FixedScale(resolution = 1.0),
FixedScale(resolution = 2.5),
FixedScale(resolution = 5.0),
FixedScale(resolution = 10.0),
FixedScale(resolution = 20.0),
FixedScale(resolution = 100.0))
test_intervals = ((1,100,200),
(1, 100, 80),
(1, 100, 40),
(1, 100, 20),
(1, 100, 5),
(1, 10, 100),
(1, 10, 50),
(1, 10, 20),)
print
for start, end, width in test_intervals:
labels = scale.labels(start, end, char_width=width)
print "(%d,%d)" % (start,end), " avail:", width,
print " used:", sum([len(x[1]) for x in labels]),
print zip(*labels)[1]
return
class OffsetFormatterTestCase(TicksTestCase):
def test_format(self):
test_ranges = [(12003, 12015, 1.0),
(1.2003, 1.2015, 1e-4),
(-1.2015, -1.2003, 1e-4)]
for start, end, resol in test_ranges:
fmt = OffsetFormatter()
fmt.use_offset=True
fmt.offset_format = "decimal"
fmt.end_label_format = "sci"
scale = FixedScale(resolution = resol)
numlabels = 12
ticks = scale.ticks(start, end, numlabels)
print "range:", start, end
labels = fmt.format(ticks, numlabels, None)
print "Labels:", labels, "\n"
print "estimated width:", fmt.estimate_width(start, end, numlabels)
print "actual width:", sum(map(len, labels))
if __name__ == "__main__":
import nose
nose.run()
|