Created
April 27, 2015 03:21
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ベクトルの角度を求める ref: http://qiita.com/vkgtaro/items/b2cd00f376c427cb9ea6
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| calculate_cosine = function (x, y) { return x / Math.sqrt(x*x + y*y); }; | |
| calculate_radian = function (cos) { return Math.acos(cos) / (Math.PI / 180); }; |
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| > calculate_radian( calculate_cosine(50, 20) ); | |
| 21.80140948635181 |
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