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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10.7
四分木
■
343
表10-3 空領域での力任せ法（BF）範囲クエリ実行時間（ミリ秒）
n d=2BF d=3BF d=4BF d=5BF
4,096 3.36 3.36 3.66 3.83
8,192 6.71 6.97 7.3 7.5
16,384 13.41 14.02 14.59 15.16
32,768 27.12 28.34 29.27 30.53
65,536 54.73 57.43 60.59 65.31
131,072 124.48 160.58 219.26 272.65
10.7
四分木
四分木
は、次の問題を解くために使われる。
範囲クエリ
デカルト平面で点の集まりがあるとき、クエリ長方形の中にある点を決
定する。アプリケーション例を図10-13 に示す。ここで点線で囲んだ長
方形はユーザが選んだもので、その長方形の中にある点は薄い灰色の四
角（
■
）で示されている。四分木領域全部がターゲットクエリに含まれる
ときには、アプリケーションは、その領域を影付きの背景にする。
図10-13 四分木を使った範囲探索
衝突検出
デカルト平面でオブジェクトの集まりがあるとき、オブジェクト間のす
べての交差を決定する。アプリケーション例を図10-14 に示す。これは、
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.