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円と円の外接線の求め方
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円と円の外接線の求め方
1.
円と円の外接線 @shora_kujira16
2.
• ICPCの幾何ライブラリ解説シリーズその2です • 円と円の交点に引き続いて、円と円の外接線の 求め方もよく分からなかったので、 自分の理解のためにまとめておきます •
参考にしたライブラリ • k_operafanさん (現在どこでダウンロードできるのか不明) • ++w++さん
3.
外接線
4.
内接線
5.
約束事 p1 p2 r1 r2 C1 C2
6.
外接線の求め方 • r1=r2の場合の方針 • C1とC2の接線は直線p1p2と平行になるので、 rot90などを使ってがんばる (難しくないので解説は省略) •
r1 r2の場合の方針 • 2本の外接線の交点qを求めてからtangentCPで C1およびC2との接点を求める
7.
r1 r2の場合 q
8.
r1 r2の場合 q r1 r2 t dθ
9.
(接線, t, r1)からなる直角三角形と (接線,
t+d, r2)からなる直角三角形において 角θを共有しているのでsinθが等しくなる r1 t = r2 t + d t = r1d r2 r1
10.
点qの位置を得るには 点p1を始点として、p2→p1の単位ベクトルを 長さtだけ伸ばせば良い q = p1
+ t · p1 p2 d = p1 + r1d r2 r1 · p1 p2 d = p1(r2 r1) r2 r1 + r1(p1 p2) r2 r1 = p1r2 p2r1 r2 r1
11.
Q. 点qがC1側ではなくC2側にある場合は? A. 別の式を導出し直さなければならないような
気がするかもしれないが、実際に計算してみると 同じ式が導出されることが分かるので、 心配しなくて良い
12.
内接線の求め方 • 面倒なので省略するが、概要は以下のとおり • 内接線と直線p1p2の交点をqとし、p1とqの距離をtとする •
内接線と直線p1p2が交わっている部分において、対頂角θ が等しい=sinθが等しいことからr1/t = r2/(d-t) • tを計算してからp1→p2の単位ベクトルを 長さtだけ伸ばしてqの座標を得る • qとC1、qとC2についてtangentCPを計算する
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