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generate labels on grid, assume grid on smallest decimal precision #11

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Merged
rmanohar merged 1 commit into from
Jul 13, 2026
Merged

generate labels on grid, assume grid on smallest decimal precision #11

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28 changes: 23 additions & 5 deletions rect2gds.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,11 @@
import shlex
from pprint import pprint

# for grid snapping
from fractions import Fraction
from decimal import Decimal
from math import gcd

def find_in_stack(stack, name):
try:
return len(stack) - 1 - stack[::-1].index(name)
Expand Down Expand Up @@ -326,6 +331,19 @@ def add_pin(component, x0, y0, x1, y1, layer, direction):
# so far pins are ignored, i dont know if gds has a notion of what a pin is, and gdsfactory has a non compatible notion of ports
component.add_polygon([(x0, y0), (x1, y0), (x1, y1), (x0, y1)], layer=layer)

def middle_snap_grid(a: float, b: float) -> float:
# snap to lower
A = Fraction(str(a)); B = Fraction(str(b))
dec = max(-Decimal(str(a)).as_tuple().exponent, -Decimal(str(b)).as_tuple().exponent)
scale = 10**dec
sa, sb = int(A*scale), int(B*scale)
fa, fb = sa % scale, sb % scale
g = gcd(fa, fb) if (fa or fb) else (gcd(sa, sb) if (sa or sb) else scale)
step = Fraction(g, scale)
mid = (A + B) / 2
q = mid / step
k = q.numerator // q.denominator
return float(step * k)

def parse_layout_file(filepath: str, gds, materials, vias, metals, materials_bloat, vias_bloat, metals_bloat, material_text, via_text, metal_text, metal_pin, align, scale: float = 1.0):
filename = os.path.basename(filepath)
Expand Down Expand Up @@ -369,7 +387,7 @@ def parse_layout_file(filepath: str, gds, materials, vias, metals, materials_blo
else:
layer_text = gds[materials[layer_name][0]]
if port_name != "#":
center = ((x0 + x1) / 2, (y0 + y1) / 2)
center = (middle_snap_grid(x0, x1), middle_snap_grid(y0, y1))
c.add_label(
port_name,
position=center,
Expand Down Expand Up @@ -397,7 +415,7 @@ def parse_layout_file(filepath: str, gds, materials, vias, metals, materials_blo
else:
layer_text = gds[metals[layer_name][0]]
if port_name != "#":
center = ((x0 + x1) / 2, (y0 + y1) / 2)
center = (middle_snap_grid(x0, x1), middle_snap_grid(y0, y1))
c.add_label(
port_name,
position=center,
Expand All @@ -416,9 +434,9 @@ def parse_layout_file(filepath: str, gds, materials, vias, metals, materials_blo
layer_text = gds[via_text[layer_name]]
else:
layer_text = gds[vias[layer_name][0]]
center = ((x0 + x1) / 2, (y0 + y1) / 2)
center = (middle_snap_grid(x0, x1), middle_snap_grid(y0, y1))
if port_name != "#":
center = ((x0 + x1) / 2, (y0 + y1) / 2)
center = (middle_snap_grid(x0, x1), middle_snap_grid(y0, y1))
c.add_label(
port_name,
position=center,
Expand All @@ -443,7 +461,7 @@ def parse_layout_file(filepath: str, gds, materials, vias, metals, materials_blo

add_box(c, x0, y0, x1, y1, layer)
if port_name != "#":
center = ((x0 + x1) / 2, (y0 + y1) / 2)
center = (middle_snap_grid(x0, x1), middle_snap_grid(y0, y1))
c.add_label(
port_name,
position=center,
Expand Down