def layout_mzi_curve(P0, P1):
curve = bezier_optimal(P0, P1, cp.angle_ex, cp.angle_ex)
return layout_waveguide(cell,
lay.Si,
curve,
cp.wg_width,
smooth=True)
def layout_connect_ports(cell, layer, port_from, port_to, smooth=True):
""" Places an "optimal" bezier curve from port_from to port_to.
"""
if port_from.name.startswith("el"):
assert port_to.name.startswith("el")
P0 = port_from.position + port_from.direction * port_from.width / 2
P3 = port_to.position + port_to.direction * port_to.width / 2
smooth = smooth and True
else:
dbu = cell.layout().dbu
P0 = port_from.position - dbu * port_from.direction
P3 = port_to.position - dbu * port_to.direction
smooth = smooth or True
angle_from = np.arctan2(port_from.direction.y,
port_from.direction.x) * 180 / pi
angle_to = np.arctan2(-port_to.direction.y,
-port_to.direction.x) * 180 / pi
curve = bezier_optimal(P0, P3, angle_from, angle_to)
if debug:
for point in curve:
print(point)
print(f"bezier_optimal({P0}, {P3}, {angle_from}, {angle_to})")
return layout_waveguide(cell,
layer,
curve, [port_from.width, port_to.width],
smooth=smooth)
def layout_connect_ports_angle(cell, layer, port_from, port_to, angle):
"""Places an "optimal" bezier curve from port_from to port_to, with a fixed orientation angle.
Args:
angle: degrees
Use when connecting ports that are like horizontal-in and horizontal-out.
"""
if port_from.name.startswith("el"):
assert port_to.name.startswith("el")
P0 = port_from.position + port_from.direction * port_from.width / 2
P3 = port_to.position + port_to.direction * port_to.width / 2
# straight lines for electrical connectors
curve = [P0, P3]
else:
P0 = port_from.position
P3 = port_to.position
curve = bezier_optimal(P0, P3, angle, angle)
return layout_waveguide_angle(cell, layer, curve,
[port_from.width, port_to.width], angle)
def bezier_curve(origin, angle0, angle3, ex, ey):
P0 = origin
P3 = origin + 100 * ex
curve = bezier_optimal(P0, P3, angle0, angle3)
return curve