int counter=25;
int st;
Wave wave1;
Wave wave2;
Wave wave3;
Rain[] rains= new Rain[300];
  
void setup(){
    size(800,800);
    st=millis();
    wave1= new Wave(color(255,255,255,50),0.02,500);
    wave3= new Wave(color(255,255,255,30),0.05,700);
    wave2= new Wave(color(255,255,255),0.07,600);
    for(int i=0; i < rains.length; i++){
      rains[i] =  new Rain(random(width),random(-height),random(2,5),random(10,15));
    }

}

void draw(){
  
  background(0);
  wave1.up();
  wave2.up();
  wave3.up();
  for(int i=0; i < counter; i++){
      rains[i].down();
    } 
  if (counter>299){
    counter=299;
  }
  if (millis()-st>3000){
  counter=counter+1;
  st=millis();
  }
}