float theta;
float x, y, d = 0.01;

void setup(){
  size(600,600);
  theta = 0;
  noStroke();
}

void draw(){
  translate(300,300);
  rotate(-PI/2);
  x = cos(theta);
  y = sin(theta);
  if(theta < 0.01){
    d = 0.01;
  }else if(theta > 2*PI - 0.01){
    d = -0.01;
  }
  theta += d;
  background(0);
  fill(0xFF*4/4);
  arc(0,0,480,480,0,theta);
  
  fill(0xFF*3/4);
  if(theta < PI){
    arc(0,0,400,400,0,(PI*1/2-(x+pow(x,3)/6)));
  }else{
    arc(0,0,400,400,0,(PI*3/2+(x+pow(x,3)/6)));
  }
    fill(0xFF*2/4);
  if(x>0&&y>0&&((y+pow(y,3)/6) < PI*1/4)){
    arc(0,0,320,320,0,(y+pow(y,3)/6));
  }else if(y>0&&((PI*1/2-x*1.11) < PI*3/4)){
    arc(0,0,320,320,0,(PI*1/2-(x+pow(x,3)/6)));
  }else if(x<0&&((PI*2/2-y*1.11) < PI*5/4)){
    arc(0,0,320,320,0,(PI*2/2-y*1.11));
  }else if(y<0&&((PI*3/2+x*1.11) < PI*7/4)){
    arc(0,0,320,320,0,(PI*3/2+x*1.11));
  }else{
    arc(0,0,320,320,0,(PI*4/2+y*1.11));
  }

  fill(0xFF*1/4);
  if(x>0&&y>0&&((y*1.11) < PI*1/4)){
    arc(0,0,240,240,0,(y*1.11));
  }else if(y>0&&((PI*1/2-x*1.11) < PI*3/4)){
    arc(0,0,240,240,0,(PI*1/2-x*1.11));
  }else if(x<0&&((PI*2/2-y*1.11) < PI*5/4)){
    arc(0,0,240,240,0,(PI*2/2-y*1.11));
  }else if(y<0&&((PI*3/2+x*1.11) < PI*7/4)){
    arc(0,0,240,240,0,(PI*3/2+x*1.11));
  }else{
    arc(0,0,240,240,0,(PI*4/2+y*1.11));
  }
  
}