def shade(self, stroke):
# determine the pivot of scaling and rotation operations
if self.pivot == 'START':
pivot = stroke[0].point
elif self.pivot == 'END':
pivot = stroke[-1].point
elif self.pivot == 'CENTER':
# minor rounding errors here, because
# given v = Vector(a, b), then (v / n) != Vector(v.x / n, v.y / n)
pivot = (1 / len(stroke)) * sum((svert.point for svert in stroke), Vector((0.0, 0.0)))
elif self.pivot == 'ABSOLUTE':
pivot = Vector((self.pivot_x, self.pivot_y))
elif self.pivot == 'PARAM':
if self.pivot_u < stroke[0].u:
pivot = stroke[0].point
else:
for prev, svert in pairwise(stroke):
if self.pivot_u < svert.u:
break
pivot = svert.point + (svert.u - self.pivot_u) * (prev.point - svert.point)
# apply scaling and rotation operations
for svert in stroke:
p = (svert.point - pivot)
x = p.x * self.scale.x
y = p.y * self.scale.y
p.x = x * self.cos_theta - y * self.sin_theta
p.y = x * self.sin_theta + y * self.cos_theta
svert.point = p + pivot
stroke.update_length()
def shade(self, stroke):
# determine the pivot of scaling and rotation operations
if self.pivot == 'START':
pivot = stroke[0].point
elif self.pivot == 'END':
pivot = stroke[-1].point
elif self.pivot == 'CENTER':
# minor rounding errors here, because
# given v = Vector(a, b), then (v / n) != Vector(v.x / n, v.y / n)
pivot = (1 / len(stroke)) * sum(
(svert.point for svert in stroke), Vector((0.0, 0.0)))
elif self.pivot == 'ABSOLUTE':
pivot = Vector((self.pivot_x, self.pivot_y))
elif self.pivot == 'PARAM':
if self.pivot_u < stroke[0].u:
pivot = stroke[0].point
else:
for prev, svert in pairwise(stroke):
if self.pivot_u < svert.u:
break
pivot = svert.point + (svert.u - self.pivot_u) * (prev.point -
svert.point)
# apply scaling and rotation operations
for svert in stroke:
p = (svert.point - pivot)
x = p.x * self.scale.x
y = p.y * self.scale.y
p.x = x * self.cos_theta - y * self.sin_theta
p.y = x * self.sin_theta + y * self.cos_theta
svert.point = p + pivot
stroke.update_length()
def iter_stroke_vertices(stroke, epsilon=1e-6):
yield stroke[0]
for prev, svert in pairwise(stroke):
if (prev.point - svert.point).length > epsilon:
yield svert
def iter_stroke_vertices(stroke, epsilon=1e-6):
yield stroke[0]
for prev, svert in pairwise(stroke):
if (prev.point - svert.point).length > epsilon:
yield svert