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83 lines
3.1 KiB
Python
83 lines
3.1 KiB
Python
"""
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2D bin-packing
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"""
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from typing import Tuple, List, Set, Sequence
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import numpy
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from numpy.typing import NDArray, ArrayLike
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from ..error import MasqueError
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def maxrects_bssf(
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rects: ArrayLike,
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containers: ArrayLike,
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presort: bool = True,
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allow_rejects: bool = True,
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) -> Tuple[NDArray[numpy.float64], Set[int]]
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"""
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sizes should be Nx2
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regions should be Mx4 (xmin, ymin, xmax, ymax)
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"""
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regions = numpy.array(containers, copy=False, dtype=float)
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rect_sizes = numpy.array(rects, copy=False, dtype=float)
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rect_locs = numpy.zeros_like(rect_sizes)
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rejected_inds = set()
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if presort:
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rotated_sizes = numpy.sort(rect_sizes, axis=0) # shortest side first
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rect_order = numpy.lexsort(rotated_sizes.T)[::-1] # Descending shortest side
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rect_sizes = rect_sizes[rect_order]
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for rect_ind, rect_size in enumerate(rect_sizes):
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''' Remove degenerate regions '''
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# First remove duplicate regions (but keep one; code below would drop both)
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regions = numpy.unique(regions, axis=0)
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# Now remove regions enclosed in another
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min_more = (regions[None, :, :2] >= regions[:, None, :2]).all(axis=2) # first axis > second axis
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max_less = (regions[None, :, 2:] <= regions[:, None, 2:]).all(axis=2) # first axis < second axis
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max_less &= ~numpy.eye(regions.shape[0], dtype=bool) # exclude self
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degenerate = (min_more & max_less).any(axis=0)
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regions = regions[~degenerate]
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''' Place the rect '''
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# Best short-side fit (bssf) to pick a region
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bssf_scores = ((regions[:, 2:] - regions[:, :2]) - rect_size).min(axis=1).astype(float)
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bssf_scores[bssf_scores < 0] = numpy.inf # doesn't fit!
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rr = bssf_scores.argmin()
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if numpy.isinf(bssf_scores[rr]):
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if allow_rejects:
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rejected_inds.add(rect_ind)
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continue
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else:
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raise MasqueError(f'Failed to find a suitable location for rectangle {rect_ind}')
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# Read out location
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loc = regions[rr, :2]
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rect_locs[rect_ind] = loc
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''' Shatter regions '''
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# Which regions does this rectangle intersect?
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min_over = regions[:, :2] >= loc + rect_size
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max_undr = regions[:, 2:] <= loc
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intersects = ~(min_over | max_undr).any(axis=1)
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# Which sides is there excess on?
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region_past_botleft = intersects[:, None] & (regions[:, :2] < loc)
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region_past_topright = intersects[:, None] & (regions[:, 2:] > loc + rect_size)
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# Create new regions
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r_lft = regions[region_past_botleft[:, 0]].copy()
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r_bot = regions[region_past_botleft[:, 1]].copy()
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r_rgt = regions[region_past_topright[:, 0]].copy()
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r_top = regions[region_past_topright[:, 1]].copy()
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r_lft[:, 2] = loc[0]
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r_bot[:, 3] = loc[1]
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r_rgt[:, 0] = loc[0] + rect_size[0]
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r_top[:, 1] = loc[1] + rect_size[1]
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regions = numpy.vstack((regions[~intersects], r_lft, r_bot, r_rgt, r_top))
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return rect_locs, rejected_inds
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