def test_third_derivs_equal(self):
ts = np.linspace(0.0, 1.0, num=10)
points = cubic_control_points()
cubic = SvCubicBezierCurve(*points)
generic = SvBezierCurve(points)
cubic_points = cubic.third_derivative_array(ts)
generic_points = generic.third_derivative_array(ts)
self.assert_numpy_arrays_equal(cubic_points, generic_points, precision=6)
def test_cubic_equals_generic(self):
ts = np.linspace(0.0, 1.0, num=10)
points = cubic_control_points()
cubic = SvCubicBezierCurve(*points)
generic = SvBezierCurve(points)
cubic_points = cubic.evaluate_array(ts)
generic_points = generic.evaluate_array(ts)
self.assert_numpy_arrays_equal(cubic_points, generic_points, precision=6)
def process(self):
if not any(socket.is_linked for socket in self.outputs):
return
points_s = self.inputs['Points'].sv_get()
tangents_s = self.inputs['Tangents'].sv_get()
points_s = ensure_nesting_level(points_s, 3)
tangents_s = ensure_nesting_level(tangents_s, 3)
curve_out = []
controls_out = []
for points, tangents in zip_long_repeat(points_s, tangents_s):
new_curves = []
new_controls = []
control_points = []
pairs = list(zip_long_repeat(points, tangents))
segments = list(zip(pairs, pairs[1:]))
if self.cyclic:
segments.append((pairs[-1], pairs[0]))
for pair1, pair2 in segments:
point1, tangent1 = pair1
point2, tangent2 = pair2
point1, tangent1 = np.array(point1), np.array(tangent1)
point2, tangent2 = np.array(point2), np.array(tangent2)
tangent1, tangent2 = tangent1 / 2.0, tangent2 / 2.0
curve = SvCubicBezierCurve(point1, point1 + tangent1,
point2 - tangent2, point2)
curve_controls = [
curve.p0.tolist(),
curve.p1.tolist(),
curve.p2.tolist(),
curve.p3.tolist()
]
new_curves.append(curve)
new_controls.append(curve_controls)
if self.concat:
new_curves = [SvConcatCurve(new_curves)]
curve_out.append(new_curves)
controls_out.append(new_controls)
self.outputs['Curve'].sv_set(curve_out)
self.outputs['ControlPoints'].sv_set(controls_out)
def process(self):
if not any(socket.is_linked for socket in self.outputs):
return
start_s = self.inputs['Start'].sv_get()
end_s = self.inputs['End'].sv_get()
knot1_s = self.inputs[CONTROL1_SOCKET].sv_get()
knot2_s = self.inputs[CONTROL2_SOCKET].sv_get()
controls_s = self.inputs['ControlPoints'].sv_get(default=[[[[]]]])
start_s = ensure_nesting_level(start_s, 3)
end_s = ensure_nesting_level(end_s, 3)
knot1_s = ensure_nesting_level(knot1_s, 3)
knot2_s = ensure_nesting_level(knot2_s, 3)
controls_s = ensure_nesting_level(controls_s, 4)
curves_out = []
controls_out = []
for starts, ends, knot1s, knot2s, controls_i in zip_long_repeat(
start_s, end_s, knot1_s, knot2_s, controls_s):
new_curves = []
new_controls = []
for start, end, knot1, knot2, controls in zip_long_repeat(
starts, ends, knot1s, knot2s, controls_i):
start, end = np.array(start), np.array(end)
knot1, knot2 = np.array(knot1), np.array(knot2)
if self.mode == CUBIC:
curve = SvCubicBezierCurve(start, knot1, knot2, end)
curve_controls = [
start.tolist(),
knot1.tolist(),
knot2.tolist(),
end.tolist()
]
elif self.mode == CUBIC_TANGENT:
curve = SvBezierCurve.from_points_and_tangents(
start, knot1, knot2, end)
curve_controls = [
curve.p0.tolist(),
curve.p1.tolist(),
curve.p2.tolist(),
curve.p3.tolist()
]
elif self.mode == CUBIC_4PT:
curve = SvCubicBezierCurve.from_four_points(
start, knot1, knot2, end)
curve_controls = [
curve.p0.tolist(),
curve.p1.tolist(),
curve.p2.tolist(),
curve.p3.tolist()
]
elif self.mode == QUADRATIC:
curve = SvBezierCurve([start, knot1, end])
curve_controls = [p.tolist() for p in curve.points]
else: # GENERIC
if not controls:
raise SvNoDataError(
socket=self.inputs['ControlPoints'], node=self)
if len(controls) < 2:
raise Exception(
"At least two control points are required to build a Bezier spline!"
)
if self.is_cyclic:
controls = controls + [controls[0]]
curve = SvBezierCurve(controls)
curve_controls = controls
new_curves.append(curve)
new_controls.extend(curve_controls)
curves_out.append(new_curves)
controls_out.append(new_controls)
self.outputs['Curve'].sv_set(curves_out)
self.outputs['ControlPoints'].sv_set(controls_out)
def interpret(self, interpreter, variables):
vec = lambda v: Vector((v[0], v[1], 0))
interpreter.assert_not_closed()
interpreter.start_new_segment()
v0 = interpreter.position
if interpreter.has_last_vertex:
v0_index = interpreter.get_last_vertex()
else:
v0_index = interpreter.new_vertex(*v0)
knot1 = None
for i, segment in enumerate(self.segments):
# For first segment, knot1 is initial pen position;
# for the following, knot1 is knot2 of previous segment.
if knot1 is None:
knot1 = interpreter.position
else:
knot1 = knot2
if interpreter.prev_bezier_knot is None:
# 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.
handle1 = knot1
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.
prev_knot_x, prev_knot_y = interpreter.prev_bezier_knot
x0, y0 = knot1
dx, dy = x0 - prev_knot_x, y0 - prev_knot_y
handle1 = x0 + dx, y0 + dy
# I assume that handle2 should be relative to knot1, not to handle1.
# interpreter.position = handle1
handle2 = interpreter.calc_vertex(self.is_abs, segment.control2[0], segment.control2[1], variables)
# interpreter.position = handle2
knot2 = interpreter.calc_vertex(self.is_abs, segment.knot2[0], segment.knot2[1], variables)
interpreter.position = knot2
if self.num_segments is not None:
r = interpreter.eval_(self.num_segments, variables)
else:
r = interpreter.dflt_num_verts
curve = SvCubicBezierCurve(vec(knot1), vec(handle1), vec(handle2), vec(knot2))
interpreter.new_curve(curve, self)
points = interpolate_bezier(vec(knot1), vec(handle1), vec(handle2), vec(knot2), r)
interpreter.new_knot("S#.{}.h1".format(i), *handle1)
interpreter.new_knot("S#.{}.h2".format(i), *handle2)
interpreter.new_knot("S#.{}.k".format(i), *knot2)
interpreter.prev_bezier_knot = handle2
for point in points[1:]:
v1_index = interpreter.new_vertex(point.x, point.y)
interpreter.new_edge(v0_index, v1_index)
v0_index = v1_index
if self.close:
interpreter.close_segment(v1_index)
interpreter.has_last_vertex = True
def interpret(self, interpreter, variables):
vec = lambda v: Vector((v[0], v[1], 0))
interpreter.assert_not_closed()
interpreter.start_new_segment()
v0 = interpreter.position
if interpreter.has_last_vertex:
v0_index = interpreter.get_last_vertex()
else:
v0_index = interpreter.new_vertex(*v0)
knot1 = None
for i, segment in enumerate(self.segments):
# For first segment, knot1 is initial pen position;
# for the following, knot1 is knot2 of previous segment.
if knot1 is None:
knot1 = interpreter.position
else:
knot1 = knot2
handle1 = interpreter.calc_vertex(self.is_abs, segment.control1[0], segment.control1[1], variables)
# In Profile mk2, for "c" handle2 was calculated relative to handle1,
# and knot2 was calculated relative to handle2.
# But in SVG specification,
# >> ... *At the end of the command*, the new current point becomes
# >> the final (x,y) coordinate pair used in the polybézier.
# This is also behaivour of browsers.
#interpreter.position = handle1
handle2 = interpreter.calc_vertex(self.is_abs, segment.control2[0], segment.control2[1], variables)
#interpreter.position = handle2
knot2 = interpreter.calc_vertex(self.is_abs, segment.knot2[0], segment.knot2[1], variables)
# Judging by the behaivour of Inkscape and Firefox, by "end of command"
# SVG spec means "end of segment".
interpreter.position = knot2
if self.num_segments is not None:
r = interpreter.eval_(self.num_segments, variables)
else:
r = interpreter.dflt_num_verts
curve = SvCubicBezierCurve(vec(knot1), vec(handle1), vec(handle2), vec(knot2))
interpreter.new_curve(curve, self)
points = interpolate_bezier(vec(knot1), vec(handle1), vec(handle2), vec(knot2), r)
interpreter.new_knot("C#.{}.h1".format(i), *handle1)
interpreter.new_knot("C#.{}.h2".format(i), *handle2)
interpreter.new_knot("C#.{}.k".format(i), *knot2)
interpreter.prev_bezier_knot = handle2
for point in points[1:]:
v1_index = interpreter.new_vertex(point.x, point.y)
interpreter.new_edge(v0_index, v1_index)
v0_index = v1_index
if self.close:
interpreter.close_segment(v1_index)
interpreter.has_last_vertex = True
def process(self):
if not any(socket.is_linked for socket in self.outputs):
return
output_src = self.output_src or self.concat
curves_out = []
controls_out = []
is_first = True
for curve1, curve2, factor1, factor2 in self.get_inputs():
_, t_max_1 = curve1.get_u_bounds()
t_min_2, _ = curve2.get_u_bounds()
curve1_end = curve1.evaluate(t_max_1)
curve2_begin = curve2.evaluate(t_min_2)
smooth = int(self.smooth_mode)
if smooth == 0:
new_curve = SvLine.from_two_points(curve1_end, curve2_begin)
new_controls = [curve1_end, curve2_begin]
elif smooth == 1:
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
tangent1 = factor1 * tangent_1_end
tangent2 = factor2 * tangent_2_begin
new_curve = SvCubicBezierCurve(
curve1_end,
curve1_end + tangent1 / 3.0,
curve2_begin - tangent2 / 3.0,
curve2_begin
)
new_controls = [new_curve.p0.tolist(), new_curve.p1.tolist(),
new_curve.p2.tolist(), new_curve.p3.tolist()]
elif smooth == 2:
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
second_1_end = curve1.second_derivative(t_max_1)
second_2_begin = curve2.second_derivative(t_min_2)
new_curve = SvBezierCurve.blend_second_derivatives(
curve1_end, tangent_1_end, second_1_end,
curve2_begin, tangent_2_begin, second_2_begin)
new_controls = [p.tolist() for p in new_curve.points]
elif smooth == 3:
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
second_1_end = curve1.second_derivative(t_max_1)
second_2_begin = curve2.second_derivative(t_min_2)
third_1_end = curve1.third_derivative_array(np.array([t_max_1]))[0]
third_2_begin = curve2.third_derivative_array(np.array([t_min_2]))[0]
new_curve = SvBezierCurve.blend_third_derivatives(
curve1_end, tangent_1_end, second_1_end, third_1_end,
curve2_begin, tangent_2_begin, second_2_begin, third_2_begin)
new_controls = [p.tolist() for p in new_curve.points]
else:
raise Exception("Unsupported smooth level")
if self.mode == 'N' and not self.cyclic and output_src and is_first:
curves_out.append(curve1)
curves_out.append(new_curve)
if self.mode == 'N' and output_src:
curves_out.append(curve2)
controls_out.append(new_controls)
is_first = False
if self.concat:
curves_out = [SvConcatCurve(curves_out)]
self.outputs['Curve'].sv_set(curves_out)
self.outputs['ControlPoints'].sv_set(controls_out)
def process(self):
if not any(socket.is_linked for socket in self.outputs):
return
output_src = self.output_src or self.concat
curves_out = []
controls_out = []
is_first = True
for params in self.get_inputs():
new_curves = []
new_controls = []
for curve1, curve2, factor1, factor2, parameter in params:
_, t_max_1 = curve1.get_u_bounds()
t_min_2, _ = curve2.get_u_bounds()
curve1_end = curve1.evaluate(t_max_1)
curve2_begin = curve2.evaluate(t_min_2)
smooth = self.smooth_mode
if smooth == '0':
new_curve = SvLine.from_two_points(curve1_end,
curve2_begin)
controls = [curve1_end, curve2_begin]
elif smooth == '1':
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
tangent1 = factor1 * tangent_1_end
tangent2 = factor2 * tangent_2_begin
new_curve = SvCubicBezierCurve(
curve1_end, curve1_end + tangent1 / 3.0,
curve2_begin - tangent2 / 3.0, curve2_begin)
controls = [
new_curve.p0.tolist(),
new_curve.p1.tolist(),
new_curve.p2.tolist(),
new_curve.p3.tolist()
]
elif smooth == '1b':
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
new_curve = SvBiArc.calc(
curve1_end,
curve2_begin,
tangent_1_end,
tangent_2_begin,
parameter,
planar_tolerance=self.planar_tolerance)
controls = [new_curve.junction.tolist()]
elif smooth == '2':
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
second_1_end = curve1.second_derivative(t_max_1)
second_2_begin = curve2.second_derivative(t_min_2)
new_curve = SvBezierCurve.blend_second_derivatives(
curve1_end, tangent_1_end, second_1_end, curve2_begin,
tangent_2_begin, second_2_begin)
controls = [p.tolist() for p in new_curve.points]
elif smooth == '3':
tangent_1_end = curve1.tangent(t_max_1)
tangent_2_begin = curve2.tangent(t_min_2)
second_1_end = curve1.second_derivative(t_max_1)
second_2_begin = curve2.second_derivative(t_min_2)
third_1_end = curve1.third_derivative_array(
np.array([t_max_1]))[0]
third_2_begin = curve2.third_derivative_array(
np.array([t_min_2]))[0]
new_curve = SvBezierCurve.blend_third_derivatives(
curve1_end, tangent_1_end, second_1_end, third_1_end,
curve2_begin, tangent_2_begin, second_2_begin,
third_2_begin)
controls = [p.tolist() for p in new_curve.points]
else:
raise Exception("Unsupported smooth level")
if self.mode == 'N' and not self.cyclic and output_src and is_first:
new_curves.append(curve1)
new_curves.append(new_curve)
if self.mode == 'N' and output_src:
new_curves.append(curve2)
new_controls.append(controls)
is_first = False
if self.concat:
new_curves = [concatenate_curves(new_curves)]
if self.join:
curves_out.extend(new_curves)
controls_out.extend(new_controls)
else:
curves_out.append(new_curves)
controls_out.append(new_controls)
self.outputs['Curve'].sv_set(curves_out)
self.outputs['ControlPoints'].sv_set(controls_out)