Radiation.pde

float n = 8;
float r;

void setup(){
  size(500, 500);
  r = height/3;
  strokeWeight(5);
}

void draw(){
  background(0);
  stroke(255);
  float t = constrain(float(frameCount)/50-0.3, 0, 1);
  float t2 = constrain(float(frameCount)/50, 0, 1);
  PVector origin = new PVector(width/2, height/2);
  for(int i=0; i<n; i++){
    PVector pmax = PVector.fromAngle(map(i, 0, n, 0, TWO_PI)).mult(r).add(origin);
    PVector p1 = PVector.lerp(origin, pmax, EaseInOutCubic(0, 1, t));println(t, t2);
    PVector p2 = PVector.lerp(origin, pmax, EaseInOutCubic(0, 1, t2));
    if(t2-t>0.1)line(p1.x, p1.y, p2.x, p2.y);
  }
}

float EaseInOutCubic(float start, float end, float t){
  end -= start;//calculate difference
  return t<0.5 ? end*4*t*t*t+start : end*(4*(t-1)*(t-1)*(t-1)+1)+start;
}