def _round_corners(pts, round_at_distance):
if len(pts) > 2:
calc_with_distance = round_at_distance
while calc_with_distance > 0.5:
new_lst = [pts[0]]
for i, curr in enumerate(pts[1:-1]):
i += 1
p1 = pts[i - 1]
p2 = curr
p3 = pts[i + 1]
if len(pts) > 3:
# i.e.: at least 4 points
if sqrt((p3[0] - p2[0])**2 +
(p3[1] - p2[1])**2) < (2 * calc_with_distance):
# prevent from crossing over.
new_lst.append(p2)
continue
generated = _gen_smoother_middle_points_from_3_points(
[p1, p2, p3], calc_with_distance)
for j in generated:
new_lst.append(j)
new_lst.append(pts[-1])
pts = new_lst
calc_with_distance /= 2.0
return pts
def _gen_smoother_middle_points_from_3_points(pts, initial):
p1 = pts[0]
p2 = pts[1]
p3 = pts[2]
distance1 = sqrt((p2[0] - p1[0]) ** 2 + (p2[1] - p1[1]) ** 2)
distance2 = sqrt((p3[0] - p1[0]) ** 2 + (p3[1] - p1[1]) ** 2)
if distance1 < 1e-10 or distance2 < 1e-10:
yield p2
else:
if distance1 < initial or distance2 < initial:
yield p2
else:
p2a = _gen_point(p1, p2, initial)
p2b = _gen_point(p3, p2, initial)
if p2a is None or p2b is None:
yield p2
else:
yield p2a
yield p2b
def _gen_smoother_middle_points_from_3_points(pts, initial):
p1 = pts[0]
p2 = pts[1]
p3 = pts[2]
distance1 = sqrt((p2[0] - p1[0])**2 + (p2[1] - p1[1])**2)
distance2 = sqrt((p3[0] - p1[0])**2 + (p3[1] - p1[1])**2)
if distance1 < 1e-10 or distance2 < 1e-10:
yield p2
else:
if distance1 < initial or distance2 < initial:
yield p2
else:
p2a = _gen_point(p1, p2, initial)
p2b = _gen_point(p3, p2, initial)
if p2a is None or p2b is None:
yield p2
else:
yield p2a
yield p2b
def _gen_point(p1, p2, new_distance):
from grandalf.utils.geometry import new_point_at_distance
initial_distance = distance = sqrt((p2[0] - p1[0]) ** 2 + (p2[1] - p1[1]) ** 2)
if initial_distance < 1e-10:
return None
if distance > new_distance:
distance = distance - new_distance
else:
return None
angle = getangle(p1, p2)
new = new_point_at_distance(p1, distance, angle)
return new
def _gen_point(p1, p2, new_distance):
from grandalf.utils.geometry import new_point_at_distance
initial_distance = distance = sqrt((p2[0] - p1[0])**2 + (p2[1] - p1[1])**2)
if initial_distance < 1e-10:
return None
if distance > new_distance:
distance = distance - new_distance
else:
return None
angle = getangle(p1, p2)
new = new_point_at_distance(p1, distance, angle)
return new
def _round_corners(pts, round_at_distance):
if len(pts) > 2:
calc_with_distance = round_at_distance
while calc_with_distance > 0.5:
new_lst = [pts[0]]
for i, curr in enumerate(pts[1:-1]):
i += 1
p1 = pts[i-1]
p2 = curr
p3 = pts[i+1]
if len(pts) > 3:
# i.e.: at least 4 points
if sqrt((p3[0] - p2[0]) ** 2 + (p3[1] - p2[1]) ** 2) < (2 * calc_with_distance):
# prevent from crossing over.
new_lst.append(p2)
continue
generated = _gen_smoother_middle_points_from_3_points(
[p1, p2, p3], calc_with_distance)
for i in generated:
new_lst.append(i)
new_lst.append(pts[-1])
pts = new_lst
calc_with_distance /= 2.
return pts
