use "states" to change background based on time passed

Far Out Light Show.pde

//Far out light show
//Steve Lambert September 20, 2016 v1
// July 17, 2019 v1.1

// declare int variable
int state = 0;

void setup(){
 size(500,500);
 background(0);
}


void draw(){ 

  println("frame: " + frameCount);
  
  if (frameCount <= 300){
    state = 0;
  } // if
  
  if (frameCount >= 301 && frameCount <= 600){
    state = 1;
  }

  if (frameCount >= 601 && frameCount <= 900){
    state = 2;
  }
  
  if (state == 0){
    background(0);
  } // if
  if (state == 1){
    background(255,0,0);
  } // if
  if (state == 2){
    background(0,0,255);
    ellipse(50,50,(width/2),height/2);
  } // if
  
println("state: " + state); 
}