def test_equality(self):
# This is to test the __eq__ and __ne__ methods, so we can't use
# assertEqual and assertNotEqual
path1 = Path(
Line(start=600 + 350j, end=650 + 325j),
Arc(start=650 + 325j, radius=25 + 25j, rotation=-30, arc=0, sweep=1, end=700 + 300j),
CubicBezier(start=700 + 300j, control1=800 + 400j, control2=750 + 200j, end=600 + 100j),
QuadraticBezier(start=600 + 100j, control=600, end=600 + 300j))
path2 = Path(
Line(start=600 + 350j, end=650 + 325j),
Arc(start=650 + 325j, radius=25 + 25j, rotation=-30, arc=0, sweep=1, end=700 + 300j),
CubicBezier(start=700 + 300j, control1=800 + 400j, control2=750 + 200j, end=600 + 100j),
QuadraticBezier(start=600 + 100j, control=600, end=600 + 300j))
self.assertTrue(path1 == path2)
# Modify path2:
path2[0].start = 601 + 350j
self.assertTrue(path1 != path2)
# Modify back:
path2[0].start = 600 + 350j
self.assertFalse(path1 != path2)
# Get rid of the last segment:
del path2[-1]
self.assertFalse(path1 == path2)
# It's not equal to a list of it's segments
self.assertTrue(path1 != path1[:])
self.assertFalse(path1 == path1[:])
def test_equality(self):
# This is to test the __eq__ and __ne__ methods, so we can't use
# assertEqual and assertNotEqual
segment = QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j)
self.assertTrue(segment == QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j))
self.assertTrue(segment != QuadraticBezier(200 + 301j, 400 + 50j, 600 + 300j))
self.assertFalse(segment == Arc(0j, 100 + 50j, 0, 0, 0, 100 + 50j))
self.assertTrue(Arc(0j, 100 + 50j, 0, 0, 0, 100 + 50j) != segment)
def test_repr(self):
from path import Point
path = Path(
Line(start=600 + 350j, end=650 + 325j),
Arc(start=650 + 325j, radius=25 + 25j, rotation=-30, arc=0, sweep=1, end=700 + 300j),
CubicBezier(start=700 + 300j, control1=800 + 400j, control2=750 + 200j, end=600 + 100j),
QuadraticBezier(start=600 + 100j, control=600, end=600 + 300j))
self.assertEqual(eval(repr(path)), path)
def test_length(self):
# expected results calculated with
# svg.path.segment_length(q, 0, 1, q.start, q.end, 1e-14, 20, 0)
q1 = QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j)
q2 = QuadraticBezier(200 + 300j, 400 + 50j, 500 + 200j)
closedq = QuadraticBezier(6 + 2j, 5 - 1j, 6 + 2j)
linq1 = QuadraticBezier(1, 2, 3)
linq2 = QuadraticBezier(1 + 3j, 2 + 5j, -9 - 17j)
nodalq = QuadraticBezier(1, 1, 1)
tests = [(q1, 487.77109389525975),
(q2, 379.90458193489155),
(closedq, 3.1622776601683795),
(linq1, 2),
(linq2, 22.73335777124786),
(nodalq, 0)]
for q, exp_res in tests:
self.assertAlmostEqual(q.length(), exp_res)
def test_svg_examples(self):
"""These is the path in the SVG specs"""
# M200,300 Q400,50 600,300 T1000,300
path1 = QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j)
self.assertAlmostEqual(path1.point(0), (200 + 300j))
self.assertAlmostEqual(path1.point(0.3), (320 + 195j))
self.assertAlmostEqual(path1.point(0.5), (400 + 175j))
self.assertAlmostEqual(path1.point(0.9), (560 + 255j))
self.assertAlmostEqual(path1.point(1), (600 + 300j))
# T1000, 300
inversion = (600 + 300j) + (600 + 300j) - (400 + 50j)
path2 = QuadraticBezier(600 + 300j, inversion, 1000 + 300j)
self.assertAlmostEqual(path2.point(0), (600 + 300j))
self.assertAlmostEqual(path2.point(0.3), (720 + 405j))
self.assertAlmostEqual(path2.point(0.5), (800 + 425j))
self.assertAlmostEqual(path2.point(0.9), (960 + 345j))
self.assertAlmostEqual(path2.point(1), (1000 + 300j))
def parse_path(pathdef, current_pos=0j):
# In the SVG specs, initial movetos are absolute, even if
# specified as 'm'. This is the default behavior here as well.
# But if you pass in a current_pos variable, the initial moveto
# will be relative to that current_pos. This is useful.
elements = list(_tokenize_path(pathdef))
# Reverse for easy use of .pop()
elements.reverse()
segments = Path()
start_pos = None
command = None
while elements:
if elements[-1] in COMMANDS:
# New command.
last_command = command # Used by S and T
command = elements.pop()
absolute = command in UPPERCASE
command = command.upper()
else:
# If this element starts with numbers, it is an implicit command
# and we don't change the command. Check that it's allowed:
if command is None:
raise ValueError("Unallowed implicit command in %s, position %s" % (
pathdef, len(pathdef.split()) - len(elements)))
if command == 'M':
# Moveto command.
x = elements.pop()
y = elements.pop()
pos = float(x) + float(y) * 1j
if absolute:
current_pos = pos
else:
current_pos += pos
# when M is called, reset start_pos
# This behavior of Z is defined in svg spec:
# http://www.w3.org/TR/SVG/paths.html#PathDataClosePathCommand
start_pos = current_pos
# Implicit moveto commands are treated as lineto commands.
# So we set command to lineto here, in case there are
# further implicit commands after this moveto.
command = 'L'
elif command == 'Z':
# Close path
if not (current_pos == start_pos):
segments.append(Line(current_pos, start_pos))
segments.closed = True
current_pos = start_pos
start_pos = None
command = None # You can't have implicit commands after closing.
elif command == 'L':
x = elements.pop()
y = elements.pop()
pos = float(x) + float(y) * 1j
if not absolute:
pos += current_pos
segments.append(Line(current_pos, pos))
current_pos = pos
elif command == 'H':
x = elements.pop()
pos = float(x) + current_pos.imag * 1j
if not absolute:
pos += current_pos.real
segments.append(Line(current_pos, pos))
current_pos = pos
elif command == 'V':
y = elements.pop()
pos = current_pos.real + float(y) * 1j
if not absolute:
pos += current_pos.imag * 1j
segments.append(Line(current_pos, pos))
current_pos = pos
elif command == 'C':
control1 = float(elements.pop()) + float(elements.pop()) * 1j
control2 = float(elements.pop()) + float(elements.pop()) * 1j
end = float(elements.pop()) + float(elements.pop()) * 1j
if not absolute:
control1 += current_pos
control2 += current_pos
end += current_pos
segments.append(CubicBezier(current_pos, control1, control2, end))
current_pos = end
elif command == 'S':
# Smooth curve. First control point is the "reflection" of
# the second control point in the previous path.
if last_command not in 'CS':
# If there is no previous command or if the previous command
# was not an C, c, S or s, assume the first control point is
# coincident with the current point.
control1 = current_pos
else:
# The first control point is assumed to be the reflection of
# the second control point on the previous command relative
# to the current point.
control1 = current_pos + current_pos - segments[-1].control2
control2 = float(elements.pop()) + float(elements.pop()) * 1j
end = float(elements.pop()) + float(elements.pop()) * 1j
if not absolute:
control2 += current_pos
end += current_pos
segments.append(CubicBezier(current_pos, control1, control2, end))
current_pos = end
elif command == 'Q':
control = float(elements.pop()) + float(elements.pop()) * 1j
end = float(elements.pop()) + float(elements.pop()) * 1j
if not absolute:
control += current_pos
end += current_pos
segments.append(QuadraticBezier(current_pos, control, end))
current_pos = end
elif command == 'T':
# Smooth curve. Control point is the "reflection" of
# the second control point in the previous path.
if last_command not in 'QT':
# If there is no previous command or if the previous command
# was not an Q, q, T or t, assume the first control point is
# coincident with the current point.
control = current_pos
else:
# The control point is assumed to be the reflection of
# the control point on the previous command relative
# to the current point.
control = current_pos + current_pos - segments[-1].control
end = float(elements.pop()) + float(elements.pop()) * 1j
if not absolute:
end += current_pos
segments.append(QuadraticBezier(current_pos, control, end))
current_pos = end
elif command == 'A':
radius = float(elements.pop()) + float(elements.pop()) * 1j
rotation = float(elements.pop())
arc = float(elements.pop())
sweep = float(elements.pop())
end = float(elements.pop()) + float(elements.pop()) * 1j
if not absolute:
end += current_pos
segments.append(Arc(current_pos, radius, rotation, arc, sweep, end))
current_pos = end
return segments
def test_svg_examples(self):
"""Examples from the SVG spec"""
path1 = parse_path('M 100 100 L 300 100 L 200 300 z')
self.assertEqual(
path1,
Path(Line(100 + 100j, 300 + 100j), Line(300 + 100j, 200 + 300j),
Line(200 + 300j, 100 + 100j)))
path1 = parse_path('M 100 100 L 200 200')
path2 = parse_path('M100 100L200 200')
self.assertEqual(path1, path2)
path1 = parse_path('M 100 200 L 200 100 L -100 -200')
path2 = parse_path('M 100 200 L 200 100 -100 -200')
self.assertEqual(path1, path2)
path1 = parse_path("""M100,200 C100,100 250,100 250,200
S400,300 400,200""")
self.assertEqual(
path1,
Path(CubicBezier(100 + 200j, 100 + 100j, 250 + 100j, 250 + 200j),
CubicBezier(250 + 200j, 250 + 300j, 400 + 300j, 400 + 200j)))
path1 = parse_path('M100,200 C100,100 400,100 400,200')
self.assertEqual(
path1,
Path(CubicBezier(100 + 200j, 100 + 100j, 400 + 100j, 400 + 200j)))
path1 = parse_path('M100,500 C25,400 475,400 400,500')
self.assertEqual(
path1,
Path(CubicBezier(100 + 500j, 25 + 400j, 475 + 400j, 400 + 500j)))
path1 = parse_path('M100,800 C175,700 325,700 400,800')
self.assertEqual(
path1,
Path(CubicBezier(100 + 800j, 175 + 700j, 325 + 700j, 400 + 800j)))
path1 = parse_path('M600,200 C675,100 975,100 900,200')
self.assertEqual(
path1,
Path(CubicBezier(600 + 200j, 675 + 100j, 975 + 100j, 900 + 200j)))
path1 = parse_path('M600,500 C600,350 900,650 900,500')
self.assertEqual(
path1,
Path(CubicBezier(600 + 500j, 600 + 350j, 900 + 650j, 900 + 500j)))
path1 = parse_path("""M600,800 C625,700 725,700 750,800
S875,900 900,800""")
self.assertEqual(
path1,
Path(CubicBezier(600 + 800j, 625 + 700j, 725 + 700j, 750 + 800j),
CubicBezier(750 + 800j, 775 + 900j, 875 + 900j, 900 + 800j)))
path1 = parse_path('M200,300 Q400,50 600,300 T1000,300')
self.assertEqual(
path1,
Path(QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j),
QuadraticBezier(600 + 300j, 800 + 550j, 1000 + 300j)))
path1 = parse_path('M300,200 h-150 a150,150 0 1,0 150,-150 z')
self.assertEqual(
path1,
Path(Line(300 + 200j, 150 + 200j),
Arc(150 + 200j, 150 + 150j, 0, 1, 0, 300 + 50j),
Line(300 + 50j, 300 + 200j)))
path1 = parse_path('M275,175 v-150 a150,150 0 0,0 -150,150 z')
self.assertEqual(
path1,
Path(Line(275 + 175j, 275 + 25j),
Arc(275 + 25j, 150 + 150j, 0, 0, 0, 125 + 175j),
Line(125 + 175j, 275 + 175j)))
path1 = parse_path("""M600,350 l 50,-25
a25,25 -30 0,1 50,-25 l 50,-25
a25,50 -30 0,1 50,-25 l 50,-25
a25,75 -30 0,1 50,-25 l 50,-25
a25,100 -30 0,1 50,-25 l 50,-25""")
self.assertEqual(
path1,
Path(Line(600 + 350j, 650 + 325j),
Arc(650 + 325j, 25 + 25j, -30, 0, 1, 700 + 300j),
Line(700 + 300j, 750 + 275j),
Arc(750 + 275j, 25 + 50j, -30, 0, 1, 800 + 250j),
Line(800 + 250j, 850 + 225j),
Arc(850 + 225j, 25 + 75j, -30, 0, 1, 900 + 200j),
Line(900 + 200j, 950 + 175j),
Arc(950 + 175j, 25 + 100j, -30, 0, 1, 1000 + 150j),
Line(1000 + 150j, 1050 + 125j)))
def test_svg_examples(self):
"""These is the path in the SVG specs"""
# M200,300 Q400,50 600,300 T1000,300
path1 = QuadraticBezier(200 + 300j, 400 + 50j, 600 + 300j)
self.assertAlmostEqual(path1.point(0), (200 + 300j))
self.assertAlmostEqual(path1.point(0.3), (336.8 + 142.5j))
self.assertAlmostEqual(path1.point(0.5), (400 + 112.5j))
self.assertAlmostEqual(path1.point(0.9), (545.6 + 232.5j))
self.assertAlmostEqual(path1.point(1), (600 + 300j))
# T1000, 300
inversion = (600 + 300j) + (600 + 300j) - (400 + 50j)
path2 = QuadraticBezier(600 + 300j, inversion, 1000 + 300j)
self.assertAlmostEqual(path2.point(0), (600 + 300j))
self.assertAlmostEqual(path2.point(0.3), (736.8 + 457.5j))
self.assertAlmostEqual(path2.point(0.5), (800 + 487.5j))
self.assertAlmostEqual(path2.point(0.9), (945.6 + 367.5j))
self.assertAlmostEqual(path2.point(1), (1000 + 300j))