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Initial buildout

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Jan Petykiewicz 2026-03-07 08:26:29 -08:00
commit f600b52f32
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4
inire/__init__.py
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"""
inire Wave-router
inire Wave-router
"""
from .geometry.primitives import Port as Port # noqa: PLC0414
from .geometry.components import Straight as Straight, Bend90 as Bend90, SBend as SBend # noqa: PLC0414
__author__ = 'Jan Petykiewicz'
__version__ = '0.1'

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inire/geometry/collision.py Normal file
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from __future__ import annotations
from typing import TYPE_CHECKING
import rtree
from shapely.geometry import Point, Polygon
from shapely.ops import unary_union
from shapely.prepared import prep
if TYPE_CHECKING:
from shapely.prepared import PreparedGeometry
from inire.geometry.primitives import Port
class CollisionEngine:
"""Manages spatial queries for collision detection."""
def __init__(self, clearance: float, max_net_width: float = 2.0) -> None:
self.clearance = clearance
self.max_net_width = max_net_width
self.static_obstacles = rtree.index.Index()
# To store geometries for precise checks
self.obstacle_geometries: dict[int, Polygon] = {} # ID -> Polygon
self.prepared_obstacles: dict[int, PreparedGeometry] = {} # ID -> PreparedGeometry
self._id_counter = 0
# Dynamic paths for multi-net congestion
self.dynamic_paths = rtree.index.Index()
# obj_id -> (net_id, geometry)
self.path_geometries: dict[int, tuple[str, Polygon]] = {}
self._dynamic_id_counter = 0
def add_static_obstacle(self, polygon: Polygon, pre_dilate: bool = True) -> None:
"""Add a static obstacle to the engine."""
_ = pre_dilate # Keep for API compatibility
obj_id = self._id_counter
self._id_counter += 1
self.obstacle_geometries[obj_id] = polygon
self.prepared_obstacles[obj_id] = prep(polygon)
# Index the bounding box of the polygon (dilated for broad prune)
# Spec: "All user-provided obstacles are pre-dilated by (W_max + C)/2"
dilation = (self.max_net_width + self.clearance) / 2.0
dilated_bounds = (
polygon.bounds[0] - dilation,
polygon.bounds[1] - dilation,
polygon.bounds[2] + dilation,
polygon.bounds[3] + dilation,
)
self.static_obstacles.insert(obj_id, dilated_bounds)
def add_path(self, net_id: str, geometry: list[Polygon]) -> None:
"""Add a net's routed path to the dynamic R-Tree."""
# Dilate by clearance/2 for congestion
dilation = self.clearance / 2.0
for poly in geometry:
dilated = poly.buffer(dilation)
obj_id = self._dynamic_id_counter
self._dynamic_id_counter += 1
self.path_geometries[obj_id] = (net_id, dilated)
self.dynamic_paths.insert(obj_id, dilated.bounds)
def remove_path(self, net_id: str) -> None:
"""Remove a net's path from the dynamic R-Tree."""
to_remove = [obj_id for obj_id, (nid, _) in self.path_geometries.items() if nid == net_id]
for obj_id in to_remove:
nid, dilated = self.path_geometries.pop(obj_id)
self.dynamic_paths.delete(obj_id, dilated.bounds)
def lock_net(self, net_id: str) -> None:
"""Move a net's dynamic path to static obstacles permanently."""
to_move = [obj_id for obj_id, (nid, _) in self.path_geometries.items() if nid == net_id]
for obj_id in to_move:
nid, dilated = self.path_geometries.pop(obj_id)
self.dynamic_paths.delete(obj_id, dilated.bounds)
# Add to static (already dilated for clearance)
new_static_id = self._id_counter
self._id_counter += 1
self.obstacle_geometries[new_static_id] = dilated
self.prepared_obstacles[new_static_id] = prep(dilated)
self.static_obstacles.insert(new_static_id, dilated.bounds)
def count_congestion(self, geometry: Polygon, net_id: str) -> int:
"""Count how many other nets collide with this geometry."""
dilation = self.clearance / 2.0
test_poly = geometry.buffer(dilation)
candidates = self.dynamic_paths.intersection(test_poly.bounds)
count = 0
for obj_id in candidates:
other_net_id, other_poly = self.path_geometries[obj_id]
if other_net_id != net_id and test_poly.intersects(other_poly):
count += 1
return count
def is_collision(
self,
geometry: Polygon,
net_width: float,
start_port: Port | None = None,
end_port: Port | None = None,
) -> bool:
"""Check if a geometry (e.g. a Move) collides with static obstacles."""
_ = net_width # Width is already integrated into engine dilation settings
dilation = self.clearance / 2.0
test_poly = geometry.buffer(dilation)
# Broad prune with R-Tree
candidates = self.static_obstacles.intersection(test_poly.bounds)
for obj_id in candidates:
# Use prepared geometry for fast intersection
if self.prepared_obstacles[obj_id].intersects(test_poly):
# Check safety zone (2nm = 0.002 um)
if start_port or end_port:
obstacle = self.obstacle_geometries[obj_id]
intersection = test_poly.intersection(obstacle)
if intersection.is_empty:
continue
# Create safety zone polygons
safety_zones = []
if start_port:
safety_zones.append(Point(start_port.x, start_port.y).buffer(0.002))
if end_port:
safety_zones.append(Point(end_port.x, end_port.y).buffer(0.002))
if safety_zones:
safe_poly = unary_union(safety_zones)
# Remove safe zones from intersection
remaining_collision = intersection.difference(safe_poly)
if remaining_collision.is_empty or remaining_collision.area < 1e-9:
continue
return True
return False

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inire/geometry/components.py Normal file
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from __future__ import annotations
from typing import NamedTuple
import numpy as np
from shapely.geometry import Polygon
from .primitives import Port
# Search Grid Snap (1.0 µm)
SEARCH_GRID_SNAP_UM = 1.0
def snap_search_grid(value: float) -> float:
"""Snap a coordinate to the nearest 1µm."""
return round(value / SEARCH_GRID_SNAP_UM) * SEARCH_GRID_SNAP_UM
class ComponentResult(NamedTuple):
"""The result of a component generation: geometry and the final port."""
geometry: list[Polygon]
end_port: Port
class Straight:
@staticmethod
def generate(start_port: Port, length: float, width: float) -> ComponentResult:
"""Generate a straight waveguide segment."""
# Calculate end port position
rad = np.radians(start_port.orientation)
dx = length * np.cos(rad)
dy = length * np.sin(rad)
end_port = Port(start_port.x + dx, start_port.y + dy, start_port.orientation)
# Create polygon (centered on port)
half_w = width / 2.0
# Points relative to start port (0,0)
points = [(0, half_w), (length, half_w), (length, -half_w), (0, -half_w)]
# Transform points
cos_val = np.cos(rad)
sin_val = np.sin(rad)
poly_points = []
for px, py in points:
tx = start_port.x + px * cos_val - py * sin_val
ty = start_port.y + px * sin_val + py * cos_val
poly_points.append((tx, ty))
return ComponentResult(geometry=[Polygon(poly_points)], end_port=end_port)
def _get_num_segments(radius: float, angle_deg: float, sagitta: float = 0.01) -> int:
"""Calculate number of segments for an arc to maintain a maximum sagitta."""
if radius <= 0:
return 1
# angle_deg is absolute angle turned
# s = R(1 - cos(theta/2)) => cos(theta/2) = 1 - s/R
# theta = 2 * acos(1 - s/R)
# n = total_angle / theta
ratio = max(0.0, min(1.0, 1.0 - sagitta / radius))
theta_max = 2.0 * np.arccos(ratio)
if theta_max == 0:
return 16
num = int(np.ceil(np.radians(abs(angle_deg)) / theta_max))
return max(4, num)
class Bend90:
@staticmethod
def generate(start_port: Port, radius: float, width: float, direction: str = "CW", sagitta: float = 0.01) -> ComponentResult:
"""Generate a 90-degree bend."""
# direction: 'CW' (-90) or 'CCW' (+90)
turn_angle = -90 if direction == "CW" else 90
# Calculate center of the arc
rad_start = np.radians(start_port.orientation)
center_angle = rad_start + (np.pi / 2 if direction == "CCW" else -np.pi / 2)
cx = start_port.x + radius * np.cos(center_angle)
cy = start_port.y + radius * np.sin(center_angle)
# Center to start is radius at center_angle + pi
theta_start = center_angle + np.pi
theta_end = theta_start + (np.pi / 2 if direction == "CCW" else -np.pi / 2)
ex = cx + radius * np.cos(theta_end)
ey = cy + radius * np.sin(theta_end)
# End port orientation
end_orientation = (start_port.orientation + turn_angle) % 360
snapped_ex = snap_search_grid(ex)
snapped_ey = snap_search_grid(ey)
end_port = Port(snapped_ex, snapped_ey, float(end_orientation))
# Generate arc geometry
num_segments = _get_num_segments(radius, 90, sagitta)
angles = np.linspace(theta_start, theta_end, num_segments + 1)
inner_radius = radius - width / 2.0
outer_radius = radius + width / 2.0
inner_points = [(cx + inner_radius * np.cos(a), cy + inner_radius * np.sin(a)) for a in angles]
outer_points = [(cx + outer_radius * np.cos(a), cy + outer_radius * np.sin(a)) for a in reversed(angles)]
return ComponentResult(geometry=[Polygon(inner_points + outer_points)], end_port=end_port)
class SBend:
@staticmethod
def generate(start_port: Port, offset: float, radius: float, width: float, sagitta: float = 0.01) -> ComponentResult:
"""Generate a parametric S-bend (two tangent arcs). Only for offset < 2*radius."""
if abs(offset) >= 2 * radius:
raise ValueError(f"SBend offset {offset} must be less than 2*radius {2 * radius}")
# Analytical length: L = 2 * sqrt(O * (2*R - O/4)) is for a specific S-bend type.
# Standard S-bend with two equal arcs:
# Offset O = 2 * R * (1 - cos(theta))
# theta = acos(1 - O / (2*R))
theta = np.arccos(1 - abs(offset) / (2 * radius))
# Length of one arc = R * theta
# Total length of S-bend = 2 * R * theta (arc length)
# Horizontal distance dx = 2 * R * sin(theta)
dx = 2 * radius * np.sin(theta)
dy = offset
# End port
rad_start = np.radians(start_port.orientation)
ex = start_port.x + dx * np.cos(rad_start) - dy * np.sin(rad_start)
ey = start_port.y + dx * np.sin(rad_start) + dy * np.cos(rad_start)
end_port = Port(ex, ey, start_port.orientation)
# Geometry: two arcs
# First arc center
direction = 1 if offset > 0 else -1
center_angle1 = rad_start + direction * np.pi / 2
cx1 = start_port.x + radius * np.cos(center_angle1)
cy1 = start_port.y + radius * np.sin(center_angle1)
# Second arc center
center_angle2 = rad_start - direction * np.pi / 2
cx2 = ex + radius * np.cos(center_angle2)
cy2 = ey + radius * np.sin(center_angle2)
# Generate points for both arcs
num_segments = _get_num_segments(radius, float(np.degrees(theta)), sagitta)
# Arc 1: theta_start1 to theta_end1
theta_start1 = center_angle1 + np.pi
theta_end1 = theta_start1 - direction * theta
# Arc 2: theta_start2 to theta_end2
theta_start2 = center_angle2
theta_end2 = theta_start2 + direction * theta
def get_arc_points(cx: float, cy: float, r_inner: float, r_outer: float, t_start: float, t_end: float) -> list[tuple[float, float]]:
angles = np.linspace(t_start, t_end, num_segments + 1)
inner = [(cx + r_inner * np.cos(a), cy + r_inner * np.sin(a)) for a in angles]
outer = [(cx + r_outer * np.cos(a), cy + r_outer * np.sin(a)) for a in reversed(angles)]
return inner + outer
poly1 = Polygon(get_arc_points(cx1, cy1, radius - width / 2, radius + width / 2, theta_start1, theta_end1))
poly2 = Polygon(get_arc_points(cx2, cy2, radius - width / 2, radius + width / 2, theta_end2, theta_start2))
return ComponentResult(geometry=[poly1, poly2], end_port=end_port)

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inire/geometry/primitives.py Normal file
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from __future__ import annotations
from dataclasses import dataclass
import numpy as np
# 1nm snap (0.001 µm)
GRID_SNAP_UM = 0.001
def snap_nm(value: float) -> float:
"""Snap a coordinate to the nearest 1nm (0.001 um)."""
return round(value / GRID_SNAP_UM) * GRID_SNAP_UM
@dataclass(frozen=True)
class Port:
"""A port defined by (x, y, orientation) in micrometers."""
x: float
y: float
orientation: float # Degrees: 0, 90, 180, 270
def __post_init__(self) -> None:
# Snap x, y to 1nm
# We need to use object.__setattr__ because the dataclass is frozen.
snapped_x = snap_nm(self.x)
snapped_y = snap_nm(self.y)
# Ensure orientation is one of {0, 90, 180, 270}
norm_orientation = int(round(self.orientation)) % 360
if norm_orientation not in {0, 90, 180, 270}:
norm_orientation = (round(norm_orientation / 90) * 90) % 360
object.__setattr__(self, "x", snapped_x)
object.__setattr__(self, "y", snapped_y)
object.__setattr__(self, "orientation", float(norm_orientation))
def translate_port(port: Port, dx: float, dy: float) -> Port:
"""Translate a port by (dx, dy)."""
return Port(port.x + dx, port.y + dy, port.orientation)
def rotate_port(port: Port, angle: float, origin: tuple[float, float] = (0, 0)) -> Port:
"""Rotate a port by a multiple of 90 degrees around an origin."""
ox, oy = origin
px, py = port.x, port.y
rad = np.radians(angle)
qx = ox + np.cos(rad) * (px - ox) - np.sin(rad) * (py - oy)
qy = oy + np.sin(rad) * (px - ox) + np.cos(rad) * (py - oy)
return Port(qx, qy, port.orientation + angle)

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inire/router/astar.py Normal file
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from __future__ import annotations
import heapq
import logging
from typing import TYPE_CHECKING
import numpy as np
from inire.geometry.components import Bend90, SBend, Straight
if TYPE_CHECKING:
from inire.geometry.components import ComponentResult
from inire.geometry.primitives import Port
from inire.router.cost import CostEvaluator
logger = logging.getLogger(__name__)
class AStarNode:
_count = 0
def __init__(
self,
port: Port,
g_cost: float,
h_cost: float,
parent: AStarNode | None = None,
component_result: ComponentResult | None = None,
) -> None:
self.port = port
self.g_cost = g_cost
self.h_cost = h_cost
self.f_cost = g_cost + h_cost
self.parent = parent
self.component_result = component_result
self.count = AStarNode._count
AStarNode._count += 1
def __lt__(self, other: AStarNode) -> bool:
# Tie-breaking: lower f first, then lower h, then order
if abs(self.f_cost - other.f_cost) > 1e-9:
return self.f_cost < other.f_cost
if abs(self.h_cost - other.h_cost) > 1e-9:
return self.h_cost < other.h_cost
return self.count < other.count
class AStarRouter:
def __init__(self, cost_evaluator: CostEvaluator) -> None:
self.cost_evaluator = cost_evaluator
self.node_limit = 100000
self.total_nodes_expanded = 0
self._collision_cache: dict[tuple[float, float, float, str, float, str], bool] = {}
def route(
self, start: Port, target: Port, net_width: float, net_id: str = "default"
) -> list[ComponentResult] | None:
"""Route a single net using A*."""
self._collision_cache.clear()
open_set: list[AStarNode] = []
# Key: (x, y, orientation)
closed_set: set[tuple[float, float, float]] = set()
start_node = AStarNode(start, 0.0, self.cost_evaluator.h_manhattan(start, target))
heapq.heappush(open_set, start_node)
nodes_expanded = 0
while open_set:
if nodes_expanded >= self.node_limit:
logger.warning(f" AStar failed: node limit {self.node_limit} reached.")
return None
current = heapq.heappop(open_set)
state = (current.port.x, current.port.y, current.port.orientation)
if state in closed_set:
continue
closed_set.add(state)
nodes_expanded += 1
self.total_nodes_expanded += 1
# Check if we reached the target (Snap-to-Target)
if (
abs(current.port.x - target.x) < 1e-6
and abs(current.port.y - target.y) < 1e-6
and current.port.orientation == target.orientation
):
return self._reconstruct_path(current)
# Look-ahead snapping
if self._try_snap_to_target(current, target, net_width, net_id, open_set):
pass
# Expand neighbors
self._expand_moves(current, target, net_width, net_id, open_set)
return None
def _expand_moves(
self,
current: AStarNode,
target: Port,
net_width: float,
net_id: str,
open_set: list[AStarNode],
) -> None:
# 1. Straights
for length in [0.5, 1.0, 5.0, 25.0]:
res = Straight.generate(current.port, length, net_width)
self._add_node(current, res, target, net_width, net_id, open_set, f"S{length}")
# 2. Bends
for radius in [5.0, 10.0, 20.0]:
for direction in ["CW", "CCW"]:
res = Bend90.generate(current.port, radius, net_width, direction)
self._add_node(current, res, target, net_width, net_id, open_set, f"B{radius}{direction}")
# 3. Parametric SBends
dx = target.x - current.port.x
dy = target.y - current.port.y
rad = np.radians(current.port.orientation)
local_dy = -dx * np.sin(rad) + dy * np.cos(rad)
if 0 < abs(local_dy) < 40.0: # Match max 2*R
try:
# Use a standard radius for expansion
res = SBend.generate(current.port, local_dy, 20.0, net_width)
self._add_node(current, res, target, net_width, net_id, open_set, f"SB{local_dy}")
except ValueError:
pass
def _add_node(
self,
parent: AStarNode,
result: ComponentResult,
target: Port,
net_width: float,
net_id: str,
open_set: list[AStarNode],
move_type: str,
) -> None:
cache_key = (
parent.port.x,
parent.port.y,
parent.port.orientation,
move_type,
net_width,
net_id,
)
if cache_key in self._collision_cache:
if self._collision_cache[cache_key]:
return
else:
hard_coll = False
for poly in result.geometry:
if self.cost_evaluator.collision_engine.is_collision(poly, net_width, start_port=parent.port, end_port=result.end_port):
hard_coll = True
break
self._collision_cache[cache_key] = hard_coll
if hard_coll:
return
move_cost = self.cost_evaluator.evaluate_move(result.geometry, result.end_port, net_width, net_id, start_port=parent.port)
g_cost = parent.g_cost + move_cost + self._step_cost(result)
h_cost = self.cost_evaluator.h_manhattan(result.end_port, target)
new_node = AStarNode(result.end_port, g_cost, h_cost, parent, result)
heapq.heappush(open_set, new_node)
def _step_cost(self, result: ComponentResult) -> float:
_ = result # Unused in base implementation
return 0.0
def _try_snap_to_target(
self,
current: AStarNode,
target: Port,
net_width: float,
net_id: str,
open_set: list[AStarNode],
) -> bool:
dist = np.sqrt((current.port.x - target.x) ** 2 + (current.port.y - target.y) ** 2)
if dist > 10.0:
return False
if current.port.orientation == target.orientation:
rad = np.radians(current.port.orientation)
dx = target.x - current.port.x
dy = target.y - current.port.y
proj = dx * np.cos(rad) + dy * np.sin(rad)
perp = -dx * np.sin(rad) + dy * np.cos(rad)
if proj > 0 and abs(perp) < 1e-6:
res = Straight.generate(current.port, proj, net_width)
self._add_node(current, res, target, net_width, net_id, open_set, "SnapTarget")
return True
return False
def _reconstruct_path(self, end_node: AStarNode) -> list[ComponentResult]:
path = []
curr = end_node
while curr.component_result:
path.append(curr.component_result)
curr = curr.parent
return path[::-1]

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inire/router/cost.py Normal file
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from __future__ import annotations
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from shapely.geometry import Polygon
from inire.geometry.collision import CollisionEngine
from inire.geometry.primitives import Port
from inire.router.danger_map import DangerMap
class CostEvaluator:
"""Calculates total cost f(n) = g(n) + h(n)."""
def __init__(self, collision_engine: CollisionEngine, danger_map: DangerMap) -> None:
self.collision_engine = collision_engine
self.danger_map = danger_map
# Cost weights
self.unit_length_cost = 1.0
self.bend_cost_multiplier = 10.0
self.greedy_h_weight = 1.1
self.congestion_penalty = 100.0 # Multiplier for overlaps
def g_proximity(self, x: float, y: float) -> float:
"""Get proximity cost from the Danger Map."""
return self.danger_map.get_cost(x, y)
def h_manhattan(self, current: Port, target: Port) -> float:
"""Heuristic: weighted Manhattan distance + orientation penalty."""
dist = abs(current.x - target.x) + abs(current.y - target.y)
# Orientation penalty if not aligned with target entry
penalty = 0.0
if current.orientation != target.orientation:
penalty += 50.0 # Arbitrary high cost for mismatch
return self.greedy_h_weight * (dist + penalty)
def evaluate_move(
self,
geometry: list[Polygon],
end_port: Port,
net_width: float,
net_id: str,
start_port: Port | None = None,
) -> float:
"""Calculate the cost of a single move (Straight, Bend, SBend)."""
total_cost = 0.0
# Strict collision check
for poly in geometry:
if self.collision_engine.is_collision(poly, net_width, start_port=start_port, end_port=end_port):
return 1e9 # Massive cost for hard collisions
# Negotiated Congestion Cost
overlaps = self.collision_engine.count_congestion(poly, net_id)
total_cost += overlaps * self.congestion_penalty
# Proximity cost from Danger Map
total_cost += self.g_proximity(end_port.x, end_port.y)
return total_cost

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inire/router/danger_map.py Normal file
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from __future__ import annotations
from typing import TYPE_CHECKING
import numpy as np
if TYPE_CHECKING:
from shapely.geometry import Polygon
class DangerMap:
"""A pre-computed grid for heuristic proximity costs."""
def __init__(
self,
bounds: tuple[float, float, float, float],
resolution: float = 1.0,
safety_threshold: float = 10.0,
k: float = 1.0,
) -> None:
# bounds: (minx, miny, maxx, maxy)
self.minx, self.miny, self.maxx, self.maxy = bounds
self.resolution = resolution
self.safety_threshold = safety_threshold
self.k = k
# Grid dimensions
self.width_cells = int(np.ceil((self.maxx - self.minx) / self.resolution))
self.height_cells = int(np.ceil((self.maxy - self.miny) / self.resolution))
# Use uint8 for memory efficiency if normalized, or float16/float32.
# Let's use float32 for simplicity and precision in the prototype.
# For a 1000x1000 grid, this is only 4MB.
# For 20000x20000, it's 1.6GB.
self.grid = np.zeros((self.width_cells, self.height_cells), dtype=np.float32)
def precompute(self, obstacles: list[Polygon]) -> None:
"""Pre-compute the proximity costs for the entire grid."""
# For each cell, find distance to nearest obstacle.
# This is a distance transform problem.
# For the prototype, we can use a simpler approach or scipy.ndimage.distance_transform_edt.
from scipy.ndimage import distance_transform_edt
# Create a binary mask of obstacles
mask = np.ones((self.width_cells, self.height_cells), dtype=bool)
# Rasterize obstacles (simplified: mark cells whose center is inside an obstacle)
# This is slow for many obstacles; in a real engine, we'd use a faster rasterizer.
from shapely.geometry import Point
for poly in obstacles:
# Get bounding box in grid coordinates
p_minx, p_miny, p_maxx, p_maxy = poly.bounds
x_start = max(0, int((p_minx - self.minx) / self.resolution))
x_end = min(self.width_cells, int((p_maxx - self.minx) / self.resolution) + 1)
y_start = max(0, int((p_miny - self.miny) / self.resolution))
y_end = min(self.height_cells, int((p_maxy - self.miny) / self.resolution) + 1)
for ix in range(x_start, x_end):
cx = self.minx + (ix + 0.5) * self.resolution
for iy in range(y_start, y_end):
cy = self.miny + (iy + 0.5) * self.resolution
if poly.contains(Point(cx, cy)):
mask[ix, iy] = False
# Distance transform (mask=True for empty space)
distances = distance_transform_edt(mask) * self.resolution
# Proximity cost: k / d^2 if d < threshold, else 0
# To avoid division by zero, we cap distances at a small epsilon (e.g. 0.1um)
safe_distances = np.maximum(distances, 0.1)
self.grid = np.where(distances < self.safety_threshold, self.k / (safe_distances**2), 0.0).astype(np.float32)
def get_cost(self, x: float, y: float) -> float:
"""Get the proximity cost at a specific coordinate."""
ix = int((x - self.minx) / self.resolution)
iy = int((y - self.miny) / self.resolution)
if 0 <= ix < self.width_cells and 0 <= iy < self.height_cells:
return float(self.grid[ix, iy])
return 1e6 # Outside bounds is expensive

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from __future__ import annotations
import logging
import time
from dataclasses import dataclass
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from inire.geometry.components import ComponentResult
from inire.geometry.primitives import Port
from inire.router.astar import AStarRouter
from inire.router.cost import CostEvaluator
logger = logging.getLogger(__name__)
@dataclass
class RoutingResult:
net_id: str
path: list[ComponentResult]
is_valid: bool
collisions: int
class PathFinder:
"""Multi-net router using Negotiated Congestion."""
def __init__(self, router: AStarRouter, cost_evaluator: CostEvaluator) -> None:
self.router = router
self.cost_evaluator = cost_evaluator
self.max_iterations = 20
self.base_congestion_penalty = 100.0
def route_all(self, netlist: dict[str, tuple[Port, Port]], net_widths: dict[str, float]) -> dict[str, RoutingResult]:
"""Route all nets in the netlist using Negotiated Congestion."""
results: dict[str, RoutingResult] = {}
self.cost_evaluator.congestion_penalty = self.base_congestion_penalty
start_time = time.monotonic()
num_nets = len(netlist)
session_timeout = max(30.0, 0.5 * num_nets * self.max_iterations)
for iteration in range(self.max_iterations):
any_congestion = False
logger.info(f"PathFinder Iteration {iteration}...")
# Sequence through nets
for net_id, (start, target) in netlist.items():
# Timeout check
elapsed = time.monotonic() - start_time
if elapsed > session_timeout:
logger.warning(f"PathFinder TIMEOUT after {elapsed:.2f}s")
# Return whatever we have so far
return self._finalize_results(results, netlist)
width = net_widths.get(net_id, 2.0)
# 1. Rip-up existing path
self.cost_evaluator.collision_engine.remove_path(net_id)
# 2. Reroute with current congestion info
net_start = time.monotonic()
path = self.router.route(start, target, width, net_id=net_id)
logger.debug(f" Net {net_id} routed in {time.monotonic() - net_start:.4f}s")
if path:
# 3. Add to R-Tree
all_geoms = []
for res in path:
all_geoms.extend(res.geometry)
self.cost_evaluator.collision_engine.add_path(net_id, all_geoms)
# Check if this new path has any congestion
collision_count = 0
for poly in all_geoms:
collision_count += self.cost_evaluator.collision_engine.count_congestion(poly, net_id)
if collision_count > 0:
any_congestion = True
results[net_id] = RoutingResult(net_id, path, collision_count == 0, collision_count)
else:
results[net_id] = RoutingResult(net_id, [], False, 0)
any_congestion = True
if not any_congestion:
break
# 4. Inflate congestion penalty
self.cost_evaluator.congestion_penalty *= 1.5
return self._finalize_results(results, netlist)
def _finalize_results(self, results: dict[str, RoutingResult], netlist: dict[str, tuple[Port, Port]]) -> dict[str, RoutingResult]:
"""Final check: re-verify all nets against the final static paths."""
logger.debug(f"Finalizing results for nets: {list(results.keys())}")
final_results = {}
# Ensure all nets in the netlist are present in final_results
for net_id in netlist:
res = results.get(net_id)
if not res or not res.path:
final_results[net_id] = RoutingResult(net_id, [], False, 0)
continue
collision_count = 0
for comp in res.path:
for poly in comp.geometry:
collision_count += self.cost_evaluator.collision_engine.count_congestion(poly, net_id)
final_results[net_id] = RoutingResult(net_id, res.path, collision_count == 0, collision_count)
return final_results

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import time
from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.router.astar import AStarRouter
from inire.router.pathfinder import PathFinder
def benchmark_scaling() -> None:
print("Starting Scalability Benchmark...")
# 1. Memory Verification (20x20mm)
# Resolution 1um -> 20000 x 20000 grid
bounds = (0, 0, 20000, 20000)
print(f"Initializing DangerMap for {bounds} area...")
dm = DangerMap(bounds=bounds, resolution=1.0)
# nbytes for float32: 20000 * 20000 * 4 bytes = 1.6 GB
mem_gb = dm.grid.nbytes / (1024**3)
print(f"DangerMap memory usage: {mem_gb:.2f} GB")
assert mem_gb < 2.0
# 2. Node Expansion Rate (50 nets)
engine = CollisionEngine(clearance=2.0)
# Use a smaller area for routing benchmark to keep it fast
routing_bounds = (0, 0, 1000, 1000)
danger_map = DangerMap(bounds=routing_bounds)
danger_map.precompute([])
evaluator = CostEvaluator(engine, danger_map)
router = AStarRouter(evaluator)
pf = PathFinder(router, evaluator)
num_nets = 50
netlist = {}
for i in range(num_nets):
# Parallel nets spaced by 10um
netlist[f"net{i}"] = (Port(0, i * 10, 0), Port(100, i * 10, 0))
print(f"Routing {num_nets} nets...")
start_time = time.monotonic()
results = pf.route_all(netlist, dict.fromkeys(netlist, 2.0))
end_time = time.monotonic()
total_time = end_time - start_time
print(f"Total routing time: {total_time:.2f} s")
print(f"Time per net: {total_time/num_nets:.4f} s")
if total_time > 0:
nodes_per_sec = router.total_nodes_expanded / total_time
print(f"Node expansion rate: {nodes_per_sec:.2f} nodes/s")
# Success rate
successes = sum(1 for r in results.values() if r.is_valid)
print(f"Success rate: {successes/num_nets * 100:.1f}%")
if __name__ == "__main__":
benchmark_scaling()

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import pytest
import numpy as np
from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.router.astar import AStarRouter
from shapely.geometry import Polygon
@pytest.fixture
def basic_evaluator():
engine = CollisionEngine(clearance=2.0)
danger_map = DangerMap(bounds=(0, 0, 100, 100))
danger_map.precompute([])
return CostEvaluator(engine, danger_map)
def test_astar_straight(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
start = Port(0, 0, 0)
target = Port(50, 0, 0)
path = router.route(start, target, net_width=2.0)
assert path is not None
assert len(path) > 0
# Final port should be target
assert abs(path[-1].end_port.x - 50.0) < 1e-6
assert path[-1].end_port.y == 0.0
def test_astar_bend(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
start = Port(0, 0, 0)
target = Port(20, 20, 90)
path = router.route(start, target, net_width=2.0)
assert path is not None
assert any("Bend90" in str(res) or hasattr(res, 'geometry') for res in path) # Loose check
assert abs(path[-1].end_port.x - 20.0) < 1e-6
assert abs(path[-1].end_port.y - 20.0) < 1e-6
assert path[-1].end_port.orientation == 90.0
def test_astar_obstacle(basic_evaluator) -> None:
# Add an obstacle in the middle of a straight path
obstacle = Polygon([(20, -5), (30, -5), (30, 5), (20, 5)])
basic_evaluator.collision_engine.add_static_obstacle(obstacle)
basic_evaluator.danger_map.precompute([obstacle])
router = AStarRouter(basic_evaluator)
start = Port(0, 0, 0)
target = Port(50, 0, 0)
path = router.route(start, target, net_width=2.0)
assert path is not None
# Path should have diverted (check that it's not a single straight)
# The path should go around the 5um half-width obstacle.
# Total wire length should be > 50.
sum(np.sqrt((p.end_port.x - p.geometry[0].bounds[0])**2 + (p.end_port.y - p.geometry[0].bounds[1])**2) for p in path)
# That's a rough length estimate.
# Better: check that no part of the path collides.
for res in path:
for poly in res.geometry:
assert not poly.intersects(obstacle)
def test_astar_snap_to_target_lookahead(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
# Target is NOT on 1um grid
start = Port(0, 0, 0)
target = Port(10.005, 0, 0)
path = router.route(start, target, net_width=2.0)
assert path is not None
assert abs(path[-1].end_port.x - 10.005) < 1e-6

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from shapely.geometry import Polygon
from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
def test_collision_detection() -> None:
# Clearance = 2um
engine = CollisionEngine(clearance=2.0)
# Static obstacle at (10, 10) with size 5x5
obstacle = Polygon([(10,10), (15,10), (15,15), (10,15)])
engine.add_static_obstacle(obstacle)
# Net width = 2um
# Dilation = (W+C)/2 = (2+2)/2 = 2.0um
# 1. Direct hit
test_poly = Polygon([(12,12), (13,12), (13,13), (12,13)])
assert engine.is_collision(test_poly, net_width=2.0) is True
# 2. Far away
test_poly_far = Polygon([(0,0), (5,0), (5,5), (0,5)])
assert engine.is_collision(test_poly_far, net_width=2.0) is False
# 3. Near hit (within clearance)
# Obstacle is at (10,10).
# test_poly is at (8,10) to (9,15).
# Centerline at 8.5. Distance to 10 is 1.5.
# Required distance (Wi+C)/2 = 2.0. Collision!
test_poly_near = Polygon([(8,10), (9,10), (9,15), (8,15)])
assert engine.is_collision(test_poly_near, net_width=2.0) is True
def test_safety_zone() -> None:
# Use zero clearance for this test to verify the 2nm port safety zone
# against the physical obstacle boundary.
engine = CollisionEngine(clearance=0.0)
obstacle = Polygon([(10,10), (15,10), (15,15), (10,15)])
engine.add_static_obstacle(obstacle)
# Port exactly on the boundary (x=10)
start_port = Port(10.0, 12.0, 0.0)
# A very narrow waveguide (1nm width) that overlaps by 1nm.
# Overlap is from x=10 to x=10.001, y=11.9995 to 12.0005.
# This fits entirely within a 2nm radius of (10.0, 12.0).
test_poly = Polygon([(9.999, 11.9995), (10.001, 11.9995), (10.001, 12.0005), (9.999, 12.0005)])
assert engine.is_collision(test_poly, net_width=0.001, start_port=start_port) is False
def test_configurable_max_net_width() -> None:
# Large max_net_width (10.0) -> large pre-dilation (6.0)
engine = CollisionEngine(clearance=2.0, max_net_width=10.0)
obstacle = Polygon([(20, 20), (25, 20), (25, 25), (20, 25)])
engine.add_static_obstacle(obstacle)
test_poly = Polygon([(15, 20), (16, 20), (16, 25), (15, 25)])
# physical check: dilated test_poly by C/2 = 1.0.
# Dilated test_poly bounds: (14, 19, 17, 26).
# obstacle: (20, 20, 25, 25). No physical collision.
assert engine.is_collision(test_poly, net_width=2.0) is False

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import pytest
from inire.geometry.primitives import Port
from inire.geometry.components import Straight, Bend90, SBend
def test_straight_generation() -> None:
start = Port(0, 0, 0)
length = 10.0
width = 2.0
result = Straight.generate(start, length, width)
# End port check
assert result.end_port.x == 10.0
assert result.end_port.y == 0.0
assert result.end_port.orientation == 0.0
# Geometry check
poly = result.geometry[0]
assert poly.area == length * width
# Check bounds
minx, miny, maxx, maxy = poly.bounds
assert minx == 0.0
assert maxx == 10.0
assert miny == -1.0
assert maxy == 1.0
def test_bend90_generation() -> None:
start = Port(0, 0, 0)
radius = 10.0
width = 2.0
# CW bend (0 -> 270)
result_cw = Bend90.generate(start, radius, width, direction='CW')
# End port (center is at (0, -10))
# End port is at (10, -10) relative to center if it was 90-degree turn?
# No, from center (0, -10), start is (0, 0) which is 90 deg.
# Turn -90 deg -> end is at 0 deg from center -> (10, -10)
assert result_cw.end_port.x == 10.0
assert result_cw.end_port.y == -10.0
assert result_cw.end_port.orientation == 270.0
# CCW bend (0 -> 90)
result_ccw = Bend90.generate(start, radius, width, direction='CCW')
assert result_ccw.end_port.x == 10.0
assert result_ccw.end_port.y == 10.0
assert result_ccw.end_port.orientation == 90.0
def test_sbend_generation() -> None:
start = Port(0, 0, 0)
offset = 5.0
radius = 10.0
width = 2.0
result = SBend.generate(start, offset, radius, width)
# End port check
assert result.end_port.y == 5.0
assert result.end_port.orientation == 0.0
# Geometry check (two arcs)
assert len(result.geometry) == 2
# Verify failure for large offset
with pytest.raises(ValueError):
SBend.generate(start, 25.0, 10.0, 2.0)
def test_bend_snapping() -> None:
# Radius that results in non-integer coords
radius = 10.1234
start = Port(0, 0, 0)
result = Bend90.generate(start, radius, 2.0, direction='CCW')
# End port should be snapped to 1µm (SEARCH_GRID_SNAP_UM)
# ex = 10.1234, ey = 10.1234
# snapped: ex = 10.0, ey = 10.0 if we round to nearest 1.0?
# SEARCH_GRID_SNAP_UM = 1.0
assert result.end_port.x == 10.0
assert result.end_port.y == 10.0

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import pytest
from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.router.astar import AStarRouter
from inire.router.pathfinder import PathFinder
from shapely.geometry import Polygon
@pytest.fixture
def basic_evaluator():
engine = CollisionEngine(clearance=2.0)
# Wider bounds to allow going around (y from -40 to 40)
danger_map = DangerMap(bounds=(0, -40, 100, 40))
danger_map.precompute([])
return CostEvaluator(engine, danger_map)
def test_astar_sbend(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
# Start at (0,0), target at (50, 3) -> 3um lateral offset
start = Port(0, 0, 0)
target = Port(50, 3, 0)
path = router.route(start, target, net_width=2.0)
assert path is not None
# Check if any component in the path is an SBend
found_sbend = False
for res in path:
# SBend should align us with the target y=3
if abs(res.end_port.y - 3.0) < 1e-6 and res.end_port.orientation == 0:
found_sbend = True
assert found_sbend
def test_pathfinder_negotiated_congestion_resolution(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
pf = PathFinder(router, basic_evaluator)
pf.max_iterations = 10
netlist = {
"net1": (Port(0, 0, 0), Port(50, 0, 0)),
"net2": (Port(0, 10, 0), Port(50, 10, 0))
}
net_widths = {"net1": 2.0, "net2": 2.0}
# Tiny obstacles to block net1 and net2 direct paths?
# No, let's block the space BETWEEN them so they must choose
# to either stay far apart or squeeze together.
# Actually, let's block their direct paths and force them
# into a narrow corridor that only fits ONE.
# Obstacles creating a wide wall with a narrow 2um gap at y=5.
# Gap y: 4 to 6. Center y=5.
# Net 1 (y=0) and Net 2 (y=10) both want to go to y=5 to pass.
# But only ONE fits at y=5.
obs_top = Polygon([(20, 6), (30, 6), (30, 30), (20, 30)])
obs_bottom = Polygon([(20, 4), (30, 4), (30, -30), (20, -30)])
basic_evaluator.collision_engine.add_static_obstacle(obs_top)
basic_evaluator.collision_engine.add_static_obstacle(obs_bottom)
basic_evaluator.danger_map.precompute([obs_top, obs_bottom])
# Increase base penalty to force detour immediately
pf.base_congestion_penalty = 1000.0
results = pf.route_all(netlist, net_widths)
assert results["net1"].is_valid
assert results["net2"].is_valid
assert results["net1"].collisions == 0
assert results["net2"].collisions == 0

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from shapely.geometry import Polygon
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.geometry.primitives import Port
def test_cost_calculation() -> None:
engine = CollisionEngine(clearance=2.0)
# 50x50 um area, 1um resolution
danger_map = DangerMap(bounds=(0, 0, 50, 50), resolution=1.0, safety_threshold=10.0, k=1.0)
# Add a central obstacle
# Grid cells are indexed from self.minx.
obstacle = Polygon([(20,20), (30,20), (30,30), (20,30)])
danger_map.precompute([obstacle])
evaluator = CostEvaluator(engine, danger_map)
# 1. Cost far from obstacle
cost_far = evaluator.g_proximity(5.0, 5.0)
assert cost_far == 0.0
# 2. Cost near obstacle (d=1.0)
# Cell center (20.5, 20.5) is inside. Cell (19.5, 20.5) center to boundary (20, 20.5) is 0.5.
# Scipy EDT gives distance to mask=False.
cost_near = evaluator.g_proximity(19.0, 25.0)
assert cost_near > 0.0
# 3. Collision cost
engine.add_static_obstacle(obstacle)
test_poly = Polygon([(22, 22), (23, 22), (23, 23), (22, 23)])
# end_port at (22.5, 22.5)
move_cost = evaluator.evaluate_move(
[test_poly], Port(22.5, 22.5, 0), net_width=2.0, net_id="net1"
)
assert move_cost == 1e9

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import pytest
from hypothesis import given, settings, strategies as st
from shapely.geometry import Polygon
from inire.geometry.collision import CollisionEngine
from inire.geometry.primitives import Port
from inire.router.astar import AStarRouter
from inire.router.cost import CostEvaluator
from inire.router.danger_map import DangerMap
from inire.router.pathfinder import RoutingResult
from inire.utils.validation import validate_routing_result
@st.composite
def random_obstacle(draw):
x = draw(st.floats(min_value=0, max_value=20))
y = draw(st.floats(min_value=0, max_value=20))
w = draw(st.floats(min_value=1, max_value=5))
h = draw(st.floats(min_value=1, max_value=5))
return Polygon([(x, y), (x + w, y), (x + w, y + h), (x, y + h)])
@st.composite
def random_port(draw):
x = draw(st.floats(min_value=0, max_value=20))
y = draw(st.floats(min_value=0, max_value=20))
orientation = draw(st.sampled_from([0, 90, 180, 270]))
return Port(x, y, orientation)
@settings(max_examples=3, deadline=None)
@given(obstacles=st.lists(random_obstacle(), min_size=0, max_size=3), start=random_port(), target=random_port())
def test_fuzz_astar_no_crash(obstacles, start, target) -> None:
engine = CollisionEngine(clearance=2.0)
for obs in obstacles:
engine.add_static_obstacle(obs)
danger_map = DangerMap(bounds=(0, 0, 30, 30))
danger_map.precompute(obstacles)
evaluator = CostEvaluator(engine, danger_map)
router = AStarRouter(evaluator)
router.node_limit = 5000 # Lower limit for fuzzing stability
# Check if start/target are inside obstacles (safety zone check)
# The router should handle this gracefully (either route or return None)
try:
path = router.route(start, target, net_width=2.0)
# Analytic Correctness: if path is returned, verify it's collision-free
if path:
result = RoutingResult(net_id="default", path=path, is_valid=True, collisions=0)
validation = validate_routing_result(
result,
obstacles,
clearance=2.0,
start_port_coord=(start.x, start.y),
end_port_coord=(target.x, target.y),
)
assert validation["is_valid"], f"Validation failed: {validation.get('reason')}"
except Exception as e:
# Unexpected exceptions are failures
pytest.fail(f"Router crashed with {type(e).__name__}: {e}")

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import pytest
from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.router.astar import AStarRouter
from inire.router.pathfinder import PathFinder
@pytest.fixture
def basic_evaluator():
engine = CollisionEngine(clearance=2.0)
danger_map = DangerMap(bounds=(0, 0, 100, 100))
danger_map.precompute([])
return CostEvaluator(engine, danger_map)
def test_pathfinder_parallel(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
pf = PathFinder(router, basic_evaluator)
netlist = {
"net1": (Port(0, 0, 0), Port(50, 0, 0)),
"net2": (Port(0, 10, 0), Port(50, 10, 0))
}
net_widths = {"net1": 2.0, "net2": 2.0}
results = pf.route_all(netlist, net_widths)
assert results["net1"].is_valid
assert results["net2"].is_valid
assert results["net1"].collisions == 0
assert results["net2"].collisions == 0
def test_pathfinder_congestion(basic_evaluator) -> None:
router = AStarRouter(basic_evaluator)
pf = PathFinder(router, basic_evaluator)
# Net1 blocks Net2
netlist = {
"net1": (Port(0, 0, 0), Port(50, 0, 0)),
"net2": (Port(25, -10, 90), Port(25, 10, 90))
}
net_widths = {"net1": 2.0, "net2": 2.0}
results = pf.route_all(netlist, net_widths)
# Verify both nets are valid and collision-free
assert results["net1"].is_valid
assert results["net2"].is_valid
assert results["net1"].collisions == 0
assert results["net2"].collisions == 0

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inire/tests/test_primitives.py Normal file
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from hypothesis import given, strategies as st
from inire.geometry.primitives import Port, translate_port, rotate_port
@st.composite
def port_strategy(draw):
x = draw(st.floats(min_value=-1e6, max_value=1e6))
y = draw(st.floats(min_value=-1e6, max_value=1e6))
orientation = draw(st.sampled_from([0, 90, 180, 270]))
return Port(x, y, orientation)
def test_port_snapping() -> None:
p = Port(0.123456, 0.654321, 90)
assert p.x == 0.123
assert p.y == 0.654
assert p.orientation == 90.0
@given(p=port_strategy())
def test_port_transform_invariants(p) -> None:
# Rotating 90 degrees 4 times should return to same orientation
p_rot = p
for _ in range(4):
p_rot = rotate_port(p_rot, 90)
assert p_rot.orientation == p.orientation
# Coordinates should be close (floating point error) but snapped to 1nm
assert abs(p_rot.x - p.x) < 1e-9
assert abs(p_rot.y - p.y) < 1e-9
@given(p=port_strategy(), dx=st.floats(min_value=-1000, max_value=1000), dy=st.floats(min_value=-1000, max_value=1000))
def test_translate_snapping(p, dx, dy) -> None:
p_trans = translate_port(p, dx, dy)
# Check that snapped result is indeed multiple of GRID_SNAP_UM (0.001 um = 1nm)
# Multiplication is more stable for this check
assert abs(p_trans.x * 1000 - round(p_trans.x * 1000)) < 1e-6
assert abs(p_trans.y * 1000 - round(p_trans.y * 1000)) < 1e-6
def test_orientation_normalization() -> None:
p = Port(0, 0, 360)
assert p.orientation == 0.0
p2 = Port(0, 0, -90)
assert p2.orientation == 270.0
p3 = Port(0, 0, 95) # Should snap to 90
assert p3.orientation == 90.0

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inire/tests/test_refinements.py Normal file
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from inire.geometry.primitives import Port
from inire.geometry.collision import CollisionEngine
from inire.router.danger_map import DangerMap
from inire.router.cost import CostEvaluator
from inire.router.astar import AStarRouter
from inire.router.pathfinder import PathFinder
from inire.geometry.components import Bend90
def test_arc_resolution_sagitta() -> None:
start = Port(0, 0, 0)
# R=10, 90 deg bend.
# High tolerance (0.5um) -> few segments
res_coarse = Bend90.generate(start, radius=10.0, width=2.0, sagitta=0.5)
# Low tolerance (0.001um = 1nm) -> many segments
res_fine = Bend90.generate(start, radius=10.0, width=2.0, sagitta=0.001)
# Check number of points in the polygon exterior
# (num_segments + 1) * 2 points usually
pts_coarse = len(res_coarse.geometry[0].exterior.coords)
pts_fine = len(res_fine.geometry[0].exterior.coords)
assert pts_fine > pts_coarse
def test_locked_paths() -> None:
engine = CollisionEngine(clearance=2.0)
danger_map = DangerMap(bounds=(0, -50, 100, 50))
danger_map.precompute([])
evaluator = CostEvaluator(engine, danger_map)
router = AStarRouter(evaluator)
pf = PathFinder(router, evaluator)
# 1. Route Net A
netlist_a = {"netA": (Port(0, 0, 0), Port(50, 0, 0))}
results_a = pf.route_all(netlist_a, {"netA": 2.0})
assert results_a["netA"].is_valid
# 2. Lock Net A
engine.lock_net("netA")
# 3. Route Net B through the same space. It should detour or fail.
# We'll place Net B's start/target such that it MUST cross Net A's physical path.
netlist_b = {"netB": (Port(0, -5, 0), Port(50, 5, 0))}
# Route Net B
results_b = pf.route_all(netlist_b, {"netB": 2.0})
# Net B should be is_valid (it detoured) or at least not have collisions
# with Net A in the dynamic set (because netA is now static).
# Since netA is static, netB will see it as a HARD collision if it tries to cross.
# Our A* will find a detour around the static obstacle.
assert results_b["netB"].is_valid
# Verify geometry doesn't intersect locked netA (physical check)
poly_a = [p.geometry[0] for p in results_a["netA"].path]
poly_b = [p.geometry[0] for p in results_b["netB"].path]
for pa in poly_a:
for pb in poly_b:
# Check physical clearance
assert not pa.buffer(1.0).intersects(pb.buffer(1.0))

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inire/utils/validation.py Normal file
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from __future__ import annotations
from typing import TYPE_CHECKING
from shapely.geometry import Point
from shapely.ops import unary_union
if TYPE_CHECKING:
from shapely.geometry import Polygon
from inire.router.pathfinder import RoutingResult
def validate_routing_result(
result: RoutingResult,
static_obstacles: list[Polygon],
clearance: float,
start_port_coord: tuple[float, float] | None = None,
end_port_coord: tuple[float, float] | None = None,
) -> dict[str, any]:
"""
Perform a high-precision validation of a routed path.
Returns a dictionary with validation results.
"""
if not result.path:
return {"is_valid": False, "reason": "No path found"}
collision_geoms = []
# High-precision safety zones
safe_zones = []
if start_port_coord:
safe_zones.append(Point(start_port_coord).buffer(0.002))
if end_port_coord:
safe_zones.append(Point(end_port_coord).buffer(0.002))
safe_poly = unary_union(safe_zones) if safe_zones else None
# Buffer by C/2
dilation = clearance / 2.0
for comp in result.path:
for poly in comp.geometry:
dilated = poly.buffer(dilation)
for obs in static_obstacles:
if dilated.intersects(obs):
intersection = dilated.intersection(obs)
if safe_poly:
# Remove safe zones from intersection
intersection = intersection.difference(safe_poly)
if not intersection.is_empty and intersection.area > 1e-9:
collision_geoms.append(intersection)
return {
"is_valid": len(collision_geoms) == 0,
"collisions": collision_geoms,
"collision_count": len(collision_geoms),
}

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inire/utils/visualization.py Normal file
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from __future__ import annotations
from typing import TYPE_CHECKING
import matplotlib.pyplot as plt
if TYPE_CHECKING:
from matplotlib.axes import Axes
from matplotlib.figure import Figure
from shapely.geometry import Polygon
from inire.router.pathfinder import RoutingResult
def plot_routing_results(
results: dict[str, RoutingResult],
static_obstacles: list[Polygon],
bounds: tuple[float, float, float, float],
) -> tuple[Figure, Axes]:
"""Plot obstacles and routed paths using matplotlib."""
fig, ax = plt.subplots(figsize=(10, 10))
# Plot static obstacles (gray)
for poly in static_obstacles:
x, y = poly.exterior.xy
ax.fill(x, y, alpha=0.5, fc="gray", ec="black")
# Plot paths
colors = plt.get_cmap("tab10")
for i, (net_id, res) in enumerate(results.items()):
color = colors(i)
if not res.is_valid:
color = "red" # Highlight failing nets
for comp in res.path:
for poly in comp.geometry:
x, y = poly.exterior.xy
ax.fill(x, y, alpha=0.7, fc=color, ec="black", label=net_id if i == 0 else "")
ax.set_xlim(bounds[0], bounds[2])
ax.set_ylim(bounds[1], bounds[3])
ax.set_aspect("equal")
ax.set_title("Inire Routing Results")
plt.grid(True)
return fig, ax