def point_path(points=[(0, 0), (4, 0), (4, 8)], width=1, layer=0):
points = np.asarray(points)
dxdy = points[1:] - points[:-1]
angles = (np.arctan2(dxdy[:, 1], dxdy[:, 0])).tolist()
angles = np.array([angles[0]] + angles + [angles[-1]])
diff_angles = (angles[1:] - angles[:-1])
mean_angles = (angles[1:] + angles[:-1]) / 2
dx = width / 2 * np.cos((mean_angles - pi / 2)) / np.cos((diff_angles / 2))
dy = width / 2 * np.sin((mean_angles - pi / 2)) / np.cos((diff_angles / 2))
left_points = points.T - np.array([dx, dy])
right_points = points.T + np.array([dx, dy])
all_points = np.concatenate([left_points.T, right_points.T[::-1]])
D = Device()
D.add_polygon(all_points, layer=layer)
D.add_port(name=1,
midpoint=points[0],
width=width,
orientation=angles[0] * 180 / pi + 180)
D.add_port(name=2,
midpoint=points[-1],
width=width,
orientation=angles[-1] * 180 / pi)
return D
# quickplot(point_path())
def _import_gds(self):
gdsii_lib = gdspy.GdsLibrary()
gdsii_lib.read_gds(self.filename)
top_level_cells = gdsii_lib.top_level()
cellname = self.cellname
if cellname is not None:
if cellname not in gdsii_lib.cell_dict:
raise ValueError(
'The requested cell (named %s) is not present in file %s' %
(cellname, self.filename))
topcell = gdsii_lib.cell_dict[cellname]
elif cellname is None and len(top_level_cells) == 1:
topcell = top_level_cells[0]
elif cellname is None and len(top_level_cells) > 1:
areas = []
for cell in top_level_cells:
areas.append(cell.area())
ind = areas.index(max(areas))
topcell = top_level_cells[ind]
D = Device('import_gds')
polygons = topcell.get_polygons(by_spec=True)
for layer_in_gds, polys in polygons.items():
D.add_polygon(polys, layer=layer_in_gds)
return D
def _arc(radius=10,
width=0.5,
theta=45,
start_angle=0,
angle_resolution=2.5,
layer=0):
""" Creates an arc of arclength ``theta`` starting at angle ``start_angle`` """
inner_radius = radius - width / 2
outer_radius = radius + width / 2
angle1 = (start_angle) * pi / 180
angle2 = (start_angle + theta) * pi / 180
t = np.linspace(angle1, angle2, np.ceil(abs(theta) / angle_resolution))
inner_points_x = (inner_radius * cos(t)).tolist()
inner_points_y = (inner_radius * sin(t)).tolist()
outer_points_x = (outer_radius * cos(t)).tolist()
outer_points_y = (outer_radius * sin(t)).tolist()
xpts = inner_points_x + outer_points_x[::-1]
ypts = inner_points_y + outer_points_y[::-1]
D = Device('arc')
D.add_polygon(points=(xpts, ypts), layer=layer)
D.add_port(name=1,
midpoint=(radius * cos(angle1), radius * sin(angle1)),
width=width,
orientation=start_angle - 90 + 180 * (theta < 0))
D.add_port(name=2,
midpoint=(radius * cos(angle2), radius * sin(angle2)),
width=width,
orientation=start_angle + theta + 90 - 180 * (theta < 0))
D.info['length'] = (abs(theta) * pi / 180) * radius
return D
def _make_poly_connection(p1, p2, layer):
d = Device()
try:
for l in layer:
d.add_polygon([
p1.endpoints[0], p1.endpoints[1], p2.endpoints[1],
p2.endpoints[0]
],
layer=l)
d.add_polygon([
p1.endpoints[0], p1.endpoints[1], p2.endpoints[0],
p2.endpoints[1]
],
layer=l)
except:
d.add_polygon([
p1.endpoints[0], p1.endpoints[1], p2.endpoints[1], p2.endpoints[0]
],
layer=layer)
d.add_polygon([
p1.endpoints[0], p1.endpoints[1], p2.endpoints[1], p2.endpoints[0]
],
layer=l)
return join(d)
def from_phidl(component: Device, **kwargs) -> Component:
"""Returns gf.Component from a phidl Device or function"""
device = call_if_func(component, **kwargs)
component = Component(name=device.name)
for ref in device.references:
new_ref = ComponentReference(
component=ref.parent,
origin=ref.origin,
rotation=ref.rotation,
magnification=ref.magnification,
x_reflection=ref.x_reflection,
)
new_ref.owner = component
component.add(new_ref)
for alias_name, alias_ref in device.aliases.items():
if alias_ref == ref:
component.aliases[alias_name] = new_ref
for p in device.ports.values():
component.add_port(
port=Port(
name=p.name,
midpoint=p.midpoint,
width=p.width,
orientation=p.orientation,
parent=p.parent,
)
)
for poly in device.polygons:
component.add_polygon(poly)
for label in device.labels:
component.add_label(
text=label.text,
position=label.position,
layer=(label.layer, label.texttype),
)
return component
def route_basic(port1,
port2,
path_type='sine',
width_type='straight',
width1=None,
width2=None,
num_path_pts=99,
layer=0):
# Assuming they're both Ports for now
point_a = np.array(port1.midpoint)
if width1 is None: width1 = port1.width
point_b = np.array(port2.midpoint)
if width2 is None: width2 = port2.width
if round(abs(mod(port1.orientation - port2.orientation, 360)), 3) != 180:
raise ValueError(
'[DEVICE] route() error: Ports do not face each other (orientations must be 180 apart)'
)
orientation = port1.orientation
separation = point_b - point_a # Vector drawn from A to B
distance = norm(separation) # Magnitude of vector from A to B
rotation = np.arctan2(
separation[1],
separation[0]) * 180 / pi # Rotation of vector from A to B
angle = rotation - orientation # If looking out along the normal of ``a``, the angle you would have to look to see ``b``
forward_distance = distance * cos(angle * pi / 180)
lateral_distance = distance * sin(angle * pi / 180)
# Create a path assuming starting at the origin and setting orientation = 0
# use the "connect" function later to move the path to the correct location
xf = forward_distance
yf = lateral_distance
if path_type == 'straight':
curve_fun = lambda t: [xf * t, yf * t]
curve_deriv_fun = lambda t: [xf + t * 0, t * 0]
if path_type == 'sine':
curve_fun = lambda t: [xf * t, yf * (1 - cos(t * pi)) / 2]
curve_deriv_fun = lambda t: [xf + t * 0, yf * (sin(t * pi) * pi) / 2]
#if path_type == 'semicircle':
# def semicircle(t):
# t = np.array(t)
# x,y = np.zeros(t.shape), np.zeros(t.shape)
# ii = (0 <= t) & (t <= 0.5)
# jj = (0.5 < t) & (t <= 1)
# x[ii] = (cos(-pi/2 + t[ii]*pi/2))*xf
# y[ii] = (sin(-pi/2 + t[ii]*pi/2)+1)*yf*2
# x[jj] = (cos(pi*3/2 - t[jj]*pi)+2)*xf/2
# y[jj] = (sin(pi*3/2 - t[jj]*pi)+1)*yf/2
# return x,y
# curve_fun = semicircle
# curve_deriv_fun = None
if width_type == 'straight':
width_fun = lambda t: (width2 - width1) * t + width1
if width_type == 'sine':
width_fun = lambda t: (width2 - width1) * (1 - cos(t * pi)
) / 2 + width1
route_path = gdspy.Path(width=width1, initial_point=(0, 0))
route_path.parametric(curve_fun,
curve_deriv_fun,
number_of_evaluations=num_path_pts,
max_points=199,
final_width=width_fun,
final_distance=None)
route_path_polygons = route_path.polygons
# Make the route path into a Device with ports, and use "connect" to move it
# into the proper location
D = Device()
D.add_polygon(route_path_polygons, layer=layer)
p1 = D.add_port(name=1, midpoint=(0, 0), width=width1, orientation=180)
p2 = D.add_port(name=2,
midpoint=[forward_distance, lateral_distance],
width=width2,
orientation=0)
D.info['length'] = route_path.length
D.rotate(angle=180 + port1.orientation - p1.orientation,
center=p1.midpoint)
D.move(origin=p1, destination=port1)
return D
def _get_glyph(font, letter):
"""
Get a block reference to the given letter
"""
if not isinstance(letter, six.string_types) and len(letter) == 1:
raise TypeError("Letter must be a string of length 1. Got: (%s)." %
(letter))
if not isinstance(font, freetype.Face):
raise TypeError(
("font %r must be a freetype font face. "
"Load a font using _get_font_by_name first.") % (font))
if getattr(font, "gds_glyphs", None) is None:
font.gds_glyphs = {}
if letter in font.gds_glyphs:
return font.gds_glyphs[letter]
# Get the font name
font_name = font.get_sfnt_name(
freetype.TT_NAME_IDS['TT_NAME_ID_PS_NAME']).string.decode()
if not font_name:
# If there is no postscript name, use the family name
font_name = font.family_name.replace(" ", "_")
block_name = "*char_%s_0x%2X" % (font_name, ord(letter))
# Load control points from font file
font.load_char(letter, freetype.FT_LOAD_FLAGS['FT_LOAD_NO_BITMAP'])
glyph = font.glyph
outline = glyph.outline
points = np.array(outline.points, dtype=float) / font.size.ascender
tags = outline.tags
# Add polylines
start, end = 0, -1
polylines = []
for contour in outline.contours:
start = end + 1
end = contour
# Build up the letter as a curve
cpoint = start
curve = gdspy.Curve(*points[cpoint], tolerance=0.001)
while cpoint <= end:
# Figure out what sort of point we are looking at
if tags[cpoint] & 1:
# We are at an on-curve control point. The next point may be
# another on-curve point, in which case we create a straight
# line interpolation, or it may be a quadratic or cubic
# bezier curve. But first we check if we are at the end of the array
if cpoint == end:
ntag = tags[start]
npoint = points[start]
else:
ntag = tags[cpoint + 1]
npoint = points[cpoint + 1]
# Then add the control points
if ntag & 1:
curve.L(*npoint)
cpoint += 1
elif ntag & 2:
# We are at a cubic bezier curve point
if cpoint + 3 <= end:
curve.C(*points[cpoint + 1:cpoint + 4].flatten())
elif cpoint + 2 <= end:
plist = list(points[cpoint + 1:cpoint + 3].flatten())
plist.extend(points[start])
curve.C(*plist)
else:
raise ValueError(
"Missing bezier control points. We require at least"
" two control points to get a cubic curve.")
cpoint += 3
else:
# Otherwise we're at a quadratic bezier curve point
if cpoint + 2 > end:
cpoint_2 = start
end_tag = tags[start]
else:
cpoint_2 = cpoint + 2
end_tag = tags[cpoint_2]
p1 = points[cpoint + 1]
p2 = points[cpoint_2]
# Check if we are at a sequential control point. In that case,
# p2 is actually the midpoint of p1 and p2.
if end_tag & 1 == 0:
p2 = (p1 + p2) / 2
# Add the curve
curve.Q(p1[0], p1[1], p2[0], p2[1])
cpoint += 2
else:
# We are looking at a control point
if not tags[cpoint] & 2:
# We are at a quadratic sequential control point.
# Check if we're at the end of the segment
if cpoint == end:
cpoint_1 = start
end_tag = tags[start]
else:
cpoint_1 = cpoint + 1
end_tag = tags[cpoint_1]
# If we are at the beginning, this is a special case,
# we need to reset the starting position
if cpoint == start:
p0 = points[end]
p1 = points[cpoint]
p2 = points[cpoint_1]
if tags[end] & 1 == 0:
# If the last point is also a control point, then the end is actually
# halfway between here and the last point
p0 = (p0 + p1) / 2
# And reset the starting position of the spline
curve = gdspy.Curve(*p0, tolerance=0.001)
else:
# The first control point is at the midpoint of this control point and the
# previous control point
p0 = points[cpoint - 1]
p1 = points[cpoint]
p2 = points[cpoint_1]
p0 = (p0 + p1) / 2
# Check if we are at a sequential control point again
if end_tag & 1 == 0:
p2 = (p1 + p2) / 2
# And add the segment
curve.Q(p1[0], p1[1], p2[0], p2[1])
cpoint += 1
else:
raise ValueError(
"Sequential control points not valid for cubic splines."
)
polylines.append(gdspy.Polygon(curve.get_points()))
# Construct the device
device = Device(block_name)
if polylines:
letter_polyline = polylines[0]
for polyline in polylines[1:]:
letter_polyline = gdspy.boolean(letter_polyline, polyline, "xor")
device.add_polygon(letter_polyline)
# Cache the return value and return it
font.gds_glyphs[letter] = (device, glyph.advance.x / font.size.ascender)
return font.gds_glyphs[letter]
def text(text='abcd', size=10, justify='left', layer=0, font="DEPLOF"):
""" Creates geometries of text
Parameters
----------
text : str
Text string to be written.
size : int or float
Size of the text
justify : {'left', 'right', 'center'}
Justification of the text.
layer : int, array-like[2], or set
Specific layer(s) to put polygon geometry on.
font: str
Font face to use. Default DEPLOF does not require additional libraries, otherwise
freetype will be used to load fonts. Font can be given either by name (e.g. "Times New Roman"),
or by file path. OTF or TTF fonts are supported.
Returns
-------
t : Device
A Device containing the text geometry.
"""
t = Device('text')
xoffset = 0
yoffset = 0
face = font
if face == "DEPLOF":
scaling = size / 1000
for line in text.split('\n'):
l = Device(name='textline')
for c in line:
ascii_val = ord(c)
if c == ' ':
xoffset += 500 * scaling
elif (33 <= ascii_val <= 126) or (ascii_val == 181):
for poly in _glyph[ascii_val]:
xpts = np.array(poly)[:, 0] * scaling
ypts = np.array(poly)[:, 1] * scaling
l.add_polygon([xpts + xoffset, ypts + yoffset],
layer=layer)
xoffset += (_width[ascii_val] +
_indent[ascii_val]) * scaling
else:
valid_chars = '!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~µ'
warnings.warn('[PHIDL] text(): Warning, some characters ignored, no geometry for character "%s" with ascii value %s. ' \
'Valid characters: %s' % (chr(ascii_val), ascii_val, valid_chars))
t.add_ref(l)
yoffset -= 1500 * scaling
xoffset = 0
else:
from .font import _get_font_by_name, _get_font_by_file, _get_glyph
# Load the font
# If we've passed a valid file, try to load that, otherwise search system fonts
font = None
if (face.endswith(".otf")
or face.endswith(".ttf")) and os.path.exists(face):
font = _get_font_by_file(face)
else:
try:
font = _get_font_by_name(face)
except ValueError:
pass
if font is None:
raise ValueError((
'[PHIDL] Failed to find font: "%s". ' +
'Try specifying the exact (full) path to the .ttf or .otf file. '
+
'Otherwise, it might be resolved by rebuilding the matplotlib font cache'
) % (face))
# Render each character
for line in text.split('\n'):
l = Device('textline')
xoffset = 0
for letter in line:
letter_dev = Device("letter")
letter_template, advance_x = _get_glyph(font, letter)
for poly in letter_template.polygons:
letter_dev.add_polygon(poly.polygons, layer=layer)
ref = l.add_ref(letter_dev)
ref.move(destination=(xoffset, 0))
ref.magnification = size
xoffset += size * advance_x
ref = t.add_ref(l)
ref.move(destination=(0, yoffset))
yoffset -= size
justify = justify.lower()
for l in t.references:
if justify == 'left': pass
if justify == 'right': l.xmax = 0
if justify == 'center':
l.move(origin=l.center, destination=(0, 0), axis='x')
t.flatten()
return t
