fortressinthesky さんへ

//.pde [Processing](http://processing.org/)
//Contribution by A-na5.tumblr

float theta = 0;
float thetaStep = 0.1;

int n = 50;
int r = 160;
float px, py, px_, py_;

void setup() {
  size(500, 500);
  noStroke();
  fill(255);
}
void draw() {
  background(0);
  go_att();
  theta += thetaStep;
}

void go_att() {
  float a1 = 0.3*sin( theta );
  float ts = TWO_PI/n;
  float chao = 2;

  for (int y = 0; y < n; y++) {
    for (int x = 0; x < n; x++) {
      px = ( sin( y+px_ ) + sin( ts*y+py_ )    )/2;
      py = ( cos( y+px_ ) + cos( ts*y+py_+a1 ) )/2;
      px_ = px*chao;
      py_ = py*chao;
      fill( x*10,y*10,250 );
      ellipse( px*r+width/2,py*r+height/2, 1,1);
    }
  }
}