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//"Siv3D January 2016"を使用 | |
# include <Siv3D.hpp> | |
using namespace std; | |
#define M 5 //ループ回数 | |
#define P int(pow(4, M - i -1)) | |
#define Q int(pow(4, M - i)) | |
#define P0 j * Q | |
#define P1 j * Q + 1 * P | |
#define P2 j * Q + 2 * P | |
#define P3 j * Q + 3 * P | |
#define P4 j * Q + 4 * P | |
void Main() | |
{ | |
//配列の要素数 | |
int n = 2; | |
for (int i = 0; i < M; i++) { | |
n = n + 3 * int(pow(4, i));//x(1)=2, x[n]=x[n-1]+ 3 * 4^(n - 2)の漸化式でn=M+1の時のx[n]の値 | |
} | |
//動的配列クラステンプレート | |
vector<double> x(n); | |
vector<double> y(n); | |
//60度のラジアン | |
double const rad = 60. * Pi / 180.; | |
//左端と右端の座標の設定 | |
x[0] = 60.; | |
y[0] = 200.; | |
x[n - 1] = 570.; | |
y[n - 1] = 200.; | |
//ループ | |
for (int i = 0; i < M; i++) { | |
//この時点での直線の数だけ処理を繰り返す | |
for (int j = 0; j < pow(4, i); j++) { | |
//三等分 | |
x[P1] = (2. * x[P0] + x[P4]) / 3; | |
y[P1] = (2. * y[P0] + y[P4]) / 3; | |
x[P3] = (x[P0] + 2 * x[P4]) / 3; | |
y[P3] = (y[P0] + 2 * y[P4]) / 3; | |
//回転行列:上で求めた2点のうち、1点を原点と見立てて60度回転 | |
x[P2] = (x[P3] - x[P1]) * cos(rad) - (y[P3] - y[P1]) * sin(rad) + x[P1]; | |
y[P2] = (x[P3] - x[P1]) * sin(rad) + (y[P3] - y[P1]) * cos(rad) + y[P1]; | |
} | |
} | |
// 線を作成 | |
LineString lines(n, Vec2(0, 0)); | |
for (int i = 0; i < n; i++) | |
{ | |
lines.point(i).set(x[i], y[i]); | |
} | |
while (System::Update()) | |
{ | |
lines.draw(1); | |
} | |
} |
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