{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fdosei.hatenadiary.jp%2Fentry%2F20121226%2Fp1\" title=\" \u306a\u3059\u89d2 - DOSEI\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/DOSEI/","height":"190","title":" \u306a\u3059\u89d2","provider_url":"https://hatena.blog","description":"y \u8ef8 (0,1,0) \u3068\u9069\u5f53\u306a\u30d9\u30af\u30c8\u30eb (a,b,c) \u306e\u306a\u3059\u89d2\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u6c42\u3081\u308b\u306b\u306f\u3001\u3069\u306e\u5f0f\u3092\u4f7f\u3048\u3070\u3088\u308a\u6b63\u78ba\u306b\u6c42\u307e\u308b\u306e\u3060\u308d\u3046\u304b\u3002 \u3092 acos() \u3067\u8a08\u7b97 \u5c0f\u6570\u3067\u5272\u308a\u7b97\u3057\u3066\u6e21\u3059\u306e\u3067\u3001\u7cbe\u5ea6\u306e\u554f\u984c\u304c\u3042\u308b\u3002 [\u22121, 1] \u3092\u306f\u307f\u51fa\u3059\u3068\u30a8\u30e9\u30fc\u3068\u306a\u308b\u3053\u3068\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3002\u8a08\u7b97\u8aa4\u5dee\u3067\u305d\u3046\u306a\u308b\u3053\u3068\u306f\u3088\u304f\u3042\u308b\u306e\u3060\u304c\u3001\u3044\u3061\u3044\u3061 errno \u3067\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306e\u306f\u3060\u308b\u3044\u306e\u3067\u3001 std::max(-1.0, std::min(x, 1.0)) \u306e\u3088\u3046\u306b\u3001\u30af\u30ea\u30c3\u30d7\u3059\u308b\u3068\u3088\u3044\u3002 \u3092 atan2() \u3067\u8a08\u7b97 \u5206\u5b50\u30fb\u5206\u6bcd\u3092\u5225\u3005\u306b\u6e21\u3059\u306e\u3067\u3001\u95a2\u6570\u304c\u3088\u304d\u306b\u8a08\u3089\u3063\u3066\u304f\u308c\u308b\u3053\u3068\u304c\u671f\u5f85\u3067\u304d\u308b\u3002 (0, 0) \u3067\u306a\u3051\u308c\u3070\u3001\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u2026","image_url":null,"blog_title":"DOSEI\u306e\u65e5\u8a18","provider_name":"Hatena Blog","published":"2012-12-26 00:00:00","categories":["\u30e1\u30e2","\u6570\u5b66","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0","\u7591\u554f"],"version":"1.0","blog_url":"https://dosei.hatenadiary.jp/","type":"rich","author_name":"DOSEI","url":"https://dosei.hatenadiary.jp/entry/20121226/p1","width":"100%"}