既約分数n/m角形の頂点を求める

makeRegularRationalShapeLineString.cpp

# include <Siv3D.hpp> // Siv3D v0.6.14

//既約分数n/m角形の頂点を求める
LineString makeRegularRationalShapeLineString(const Vec2& center, double r, int32 n, int32 m)
{
	LineString points(n);
	for (auto i : step(n))
	{
		const double theta = Math::TwoPi / n * i * m;
		points[i] = center + Circular(r, theta);
	}
	return points;
}


void Main()
{
	while (System::Update())
	{
		makeRegularRationalShapeLineString(Scene::Center(), 100, 5, 2).drawClosed();
	}
}