DrawSpiral.java

class DrawSpiral {
  public static void main(String[] args) {
    int size = 15;
    double cx = size / 2.d;
    double cy = size / 2.d;
    double tmax = 6 * Math.PI;
    double a = size / 2.d / tmax;

    boolean[][] res = new boolean[size][size];

    double r = 0.d;
    double dr = 0.1d;
    for (double t = 0.d; t < tmax;) {
      double x = r * Math.cos(t) + cx;
      double y = r * Math.sin(t) + cy;

      res[(int)x][(int)y] = true;

      r += dr;
      t = r / a;
    }

    for (int y = 0; y < size; y++) {
      for (int x = 0; x < size; x++) {
        System.out.print(res[x][y] ? ":party_hkurokawa:" : ":hkurokawa:");
      }
      System.out.println();
    }
  }
}