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int howMany = 15;
float step, edge, theta, x;
ExLine [] Elem = new ExLine[howMany];
ExLine [] Elem2 = new ExLine[howMany];
ExLine [] Elem3 = new ExLine[howMany];

void setup() {
  size(500, 400);
  x = 0;
  edge = width/10;
  step = (width-2*edge)/howMany;

  theta = 0;
  for (int i = 0; i < Elem.length; i++) {
    x = i*step;
    Elem[i]= new ExLine(x, 0+theta, edge,1,1);
    Elem2[i]= new ExLine(x, PI/2+theta, edge,.9,.9);
    Elem3[i]= new ExLine(x, PI+theta, edge,.8,.8);
    theta += PI/howMany;
  }
}

void draw() {
  background(#0D3F40);
  for (int i = 0; i < Elem.length; i++) {
    Elem[i].display();
    Elem2[i].display();
    Elem3[i].display();
  }

  if (frameCount % 2 == 0 && frameCount < 121) saveFrame("image-####.gif");
}

class ExLine {
  float x, x2, y, y2, ymin, ymax;
  float rad, theta, edge;

  ExLine(float _x, float _theta, float _edge, float _ymin, float _ymax) {
    x = _x;
    y = height*.6;
    rad = 70;
    theta = _theta;
    edge = _edge;
    ymin = -30*_ymin;
    ymax = -120*_ymax;
  }

  void display() {
    fill(255,50);
    stroke(255,100);
    y2= map(sin(theta), -1, 1, ymin, ymax);
    x2 = map(sin(theta), -1, 1, step*.4, step*.9);
    rect(x+edge, y, x2, y2);
    theta += .0523;
  }
}