54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
from __future__ import annotations
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from math import hypot
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from typing import Sequence
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from .models import GridCellModel, GridDescriptor
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class GridPlanner:
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"""Helper that picks a grid cell using simple heuristics."""
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def select_cell(
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self, descriptor: GridDescriptor, preferred_label: str | None = None
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) -> GridCellModel | None:
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if not descriptor.cells:
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return None
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if preferred_label:
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match = self._match_label(descriptor.cells, preferred_label)
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if match:
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return match
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center_point = self._grid_center(descriptor)
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return min(descriptor.cells, key=lambda cell: self._distance(self._cell_center(cell), center_point))
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def describe(self, descriptor: GridDescriptor) -> str:
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cell_count = len(descriptor.cells)
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return (
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f"Grid {descriptor.grid_id} is {descriptor.rows}x{descriptor.columns} with {cell_count} cells."
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)
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def _grid_center(self, descriptor: GridDescriptor) -> tuple[float, float]:
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width = descriptor.metadata.get("width", 0)
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height = descriptor.metadata.get("height", 0)
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return (width / 2, height / 2)
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def _cell_center(self, cell: GridCellModel) -> tuple[float, float]:
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left, top, right, bottom = cell.bounds
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return ((left + right) / 2, (top + bottom) / 2)
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def _distance(
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self, first: tuple[float, float], second: tuple[float, float]
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) -> float:
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return hypot(first[0] - second[0], first[1] - second[1])
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def _match_label(
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self, cells: Sequence[GridCellModel], label: str
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) -> GridCellModel | None:
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lowered = label.lower()
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for cell in cells:
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if cell.label and lowered in cell.label.lower():
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return cell
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return None
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