def test_parametric_torus():
# Draw a torus using a parametric path.
def circle(t):
r = 1.9
x = r * math.sin(t)
y = r * math.cos(t)
z = 0
return (x, y, z)
def radius_func(t):
return 0.9
torus = Path(
circle,
radius_func,
tmin=0,
tmax=(2 * math.pi),
)
points = torus.render()
layers = draw_layers(points, on='#', off='-')
assert_equal(
'\n\n'.join(layers),
dedent('''
-###-
##-##
#---#
##-##
-###-
''').strip(),
)
def test_parametric_changing_radius():
# Draw a variable width line.
start = Point3(0.5, 0, 0)
end = Point3(19.5, 0, 0)
def line(t):
x = lerp(start.x, end.x, t)
y = lerp(start.y, end.y, t)
z = lerp(start.z, end.z, t)
return (x, y, z)
def radius_func(t):
# Get larger until the middle, then get smaller again.
if t < 0.5:
return lerp(0, 3.5, t)
else:
return lerp(3.5, 0, t)
path = Path(
line,
radius_func,
tmin=0,
tmax=1,
)
points = path.render()
layers = draw_layers(points, on='#', off='-')
assert_equal(
'\n\n'.join(layers),
dedent('''
--------###--------
-----#########-----
--------###--------
-----#########-----
###################
-----#########-----
--------###--------
-----#########-----
--------###--------
''').strip(),
)
