beziers

color bg = #361826;
color s = #ffffff;
float x1, x2, x3, y1, y2, y3, theta;

void setup() {
  size(500, 500);
  background(bg);
  noFill();
}

void draw() {
  background(bg);
  stroke(s,200);

  for (int i=0; i<20; i++) {
    strokeWeight(1);
    beginShape();
    vertex(0, i*20); // first point
    x2 = map(sin(theta), -1, 1, 180+i*8, 250+i*6);
    y2 = map(sin(theta), -1, 1, 150, 300);
    x1 = x2*0.5;
    y1 = (x2+y2)-x1;
    x3 = x2*1.7;
    y3 = (x2+y2)-x3;
    bezierVertex(209, -3, x1, y1, x2, y2);
    bezierVertex(x3, y3, 444, 419, 500-i*20, 500);
    endShape();
  }

  theta += 0.0523;

  if (frameCount % 5 == 0 && frameCount<121) saveFrame("image-####.gif");
}