def testDistance(self):
point1 = LatLng(37.739323, -122.473586)
point2 = LatLng(37.749832, -122.453332)
distance1 = Polyline(point1, point2).distance
assert round(distance1) == 2130.0, "distance calculation off."
distance2 = Polyline(point1, point2, point1).distance
assert round(distance2) == 4260.0, "distance calculation off."
def testConstructor(self):
start = LatLng(35.786100, -78.662430)
end = LatLng(35.788140, -78.669680)
poly = Polyline([start, end])
self.assertEqual(poly.first, start)
self.assertEqual(poly.last, end)
poly = Polyline((start, end))
self.assertEqual(poly.first, start)
self.assertEqual(poly.last, end)
poly = Polyline(start, end)
self.assertEqual(poly.first, start)
self.assertEqual(poly.last, end)
def testListMethods(self):
poly = Polyline(
[LatLng(35.786100, -78.662430),
LatLng(35.788140, -78.669680)])
self.assertEquals(len(poly), 2)
self.assertEqual(poly[0], poly.first)
self.assertEqual(poly[-1], poly.last)
a = LatLng(0, 0)
b = LatLng(2, 2)
poly[0] = a
poly.last = b
self.assertEqual(poly.first, a)
self.assertEqual(poly.last, b)
poly.prepend(a)
poly.append(b)
self.assertEquals(len(poly), 4)
poly.insert(2, LatLng(3, 3))
self.assertEquals(len(poly), 5)
self.assertAlmostEquals(poly.bounds.north, 3)
self.assertAlmostEquals(poly.bounds.south, 0)
self.assertAlmostEquals(poly.bounds.west, 0)
self.assertAlmostEquals(poly.bounds.east, 3)
def testInverse(self):
poly = Polyline(
[LatLng(35.786100, -78.662430),
LatLng(35.788140, -78.669680)])
poly_i = poly.inverse
self.assertEqual(poly.first, poly_i.last)
self.assertEqual(poly.last, poly_i.first)
def testBounds(self):
poly = Polyline(
[LatLng(35.786100, -78.662430),
LatLng(35.788140, -78.669680)])
self.assertAlmostEqual(poly.bounds.north, 35.788140)
self.assertAlmostEqual(poly.bounds.south, 35.786100)
self.assertAlmostEqual(poly.bounds.west, -78.669680)
self.assertAlmostEqual(poly.bounds.east, -78.662430)
def decode_polyline(point_str):
'''Decodes a polyline that has been encoded using Google's algorithm and
returns a Polyline object.
:param point_str: Encoded polyline string.
:type point_str: string
:returns: Decoded polyline
:rtype: Polyline
'''
latlngs = [LatLng(l[1], l[0]) for l in decode(point_str)]
return None if len(latlngs) < 2 else Polyline(latlngs)
def testInterpolate(self):
point1 = LatLng(37.739323, -122.473586)
point2 = LatLng(37.749832, -122.453332)
line = Polyline([point1, point2])
assert line.interpolate(0.0) == point1
assert line.interpolate(1.0) == point2
try:
line.interpolate(-1.0)
assert False, "Shouldn't accept values < 0"
except ValueError:
pass
half = line.interpolate(0.5)
self.assertAlmostEquals(half.distance_to(point1), line.distance / 2, 3)
assert half == LatLng(37.7445779332, -122.4634597190)
