obelisk2 https://blog.hatena.ne.jp/obelisk2/ Camera Obscura https://obelisk.hatenablog.com/ Ruby 水平投射です。 require 'bundler/setup' require 'cairo' require './gifanime' include Math W = 600; H = 300 V0 = 10.0; A = 0.75; G = 5.0 v = lambda {|n| - A ** n * sqrt(2 * G * H)} t = lambda do |n| if n.zero? sqrt(2 * H / G) else ar = [1] n.times {|i| ar << 2 * A ** (i + 1)} sqrt(2 * H / G) * ar.inject(:+) … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fobelisk.hatenablog.com%2Fentry%2F2016%2F10%2F11%2F015939" title="cairo と Ruby で遊んでみる（2） - Camera Obscura" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/o/obelisk2/20161011/20161011015401.gif Hatena Blog https://hatena.blog 2016-10-11 01:59:39 rich https://obelisk.hatenablog.com/entry/2016/10/11/015939 1.0 100%