December 2016
Intermediate to advanced
440 pages
9h 44m
Japanese
Content preview from アルゴリズムクイックリファレンス 第2版
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9.6
ボロノイ図
■
311
9.6.2
解
実装は、汀線状態を保守するのに必要な計算のために複雑になる。図9-16では、
いくつかの特別な場合を省いた。コードリポジトリの
fortune.py
には、放物線の交
点の幾何学計算をする関数
computeBreakPoint
が含まれる。この実装をサポートす
るクラスを図9-16にまとめる。この実装は
Python
の
heapq
モジュールを使用する。
これによって優先度付きキューを作り処理する
heappop
メソッドと
heappush
メソッ
ドを使用できる。
図9-16 コードをサポートするクラス
例9-4に示すように、
process
メソッドは、各入力点に対してサイトイベントを作
成して、各イベントを
y
座標の降順に（同じだったら
x
座標の昇順に）
1
つずつ処理
する。
312
■
9
章 計算幾何学
例
9-4
ボロノイ図の
Python
実装
from heapq import heappop, heappush
class Voronoi:
def process(self, points):
self.pq = []
self.tree = None
self.firstPoint = None #
位置が同じものは最初の点によって扱う
self.stillOnFirstRow ...
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