揺れる球

/**
* swaying balls
*
* @author aa_debdeb
* @date 2016/12/18
*/

int LOOP = 120;
int NUM = 24;

void setup(){
  size(500, 500);
  noStroke();
  fill(255);
}

void draw(){
  background(0);
  translate(width / 2, height / 2);
  for(int i = 0; i < NUM; i++){
    float angle = TWO_PI / NUM * i;
    float time = float((frameCount + LOOP / NUM * i) % LOOP) / LOOP;
    float radius = time < 0.5 ? map(time, 0, 0.5, 0, 150): map(time, 0.5, 1.0, 150, 200);
    float size = time < 0.5 ? map(time, 0, 0.5, 0, 10): map(time, 0.5, 1.0, 10, 0);
    size *= map(sin(time * PI * 6 + HALF_PI), -1, 1, 0.8, 1.2);
    float osc = map(sin(time * PI * 6), -1, 1, -10, 10);
    osc *= time < 0.66 ? map(time, 0, 0.66, 0, 1): map(time, 0.66, 1.0, 1, 0);
    pushMatrix();
    rotate(angle);
    translate(radius, osc);
    ellipse(0, 0, size, size);
    popMatrix();
  }
}