ArrayList curtain;
float theta;

void setup() {
  size(400, 400);
  background(#542437);

  curtain = new ArrayList();

  for (int x=-30; x < width; x +=8) {
    Strull strull = new Strull(x, theta);
    curtain.add(strull);
    theta += random(.15, .2);
  }
}

void draw() {
  background(#542437);
  noStroke();
  //println(mouseX + ", " + mouseY);
  for (int i=0; i < curtain.size(); i++) {
    Strull stru = (Strull) curtain.get(i);
    stru.display();
  }
  if (frameCount % 6 == 0 && frameCount<121) saveFrame("image-####.gif");
}

void mouseClicked() {
  save(random(1234)+".jpg");
}
class Strull {
  float x, h, marge, marge_y, t, theta;
  float r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12;

  Strull(float _x, float _theta) {
    x = _x;
    marge = 20;
    marge_y = 10;
    //fill(#C02942, 150 + random(50));  
    theta = _theta;
    r1 = random(marge/2);
    r2 = random(marge/2);
    r3 = random(marge/2);
    r4 = random(marge/2);
    r5 = random(marge, marge*2);
    r6 = random(marge, marge*2);
    r7 = random(marge, marge*2);
    r8 = random(marge, marge*2);
    r9 = 100+random(marge_y);
    r10 = 250+random(marge_y);
    r11 = 200+random(marge_y);
    r12 =80+random(marge_y) ;
  }

  void display() {
    noFill();
    stroke(#C02942, 180);
    t = map(sin(theta), -1, 1, -marge/2, marge);
    h = map(cos(theta),-1,1,.85,.9);
    beginShape();
    curveVertex(x, 0);
    curveVertex(x + r1, 0);
    curveVertex(x + r2 +t, r9);
    curveVertex(x + r3-t/2, r10);
    curveVertex(x + t/2, height*h);

    curveVertex(x + r5- t/2, height*h);
    curveVertex(x + r6-t/2, r11);
    curveVertex(x + r7+t, r12);
    curveVertex(x + r8, 0);
    curveVertex(x + r8, 0);

    endShape(CLOSE);
    theta -= .0523;
  }
}