GetEven

var cnt =-12;//x-value and counter for each polynomial
var a=1,t=0;//initial a, and reset counter t
function setup() {
  createCanvas(400, 400);
  background(20,60,90);
  strokeWeight(0.1);//thin lines
  fill(0, 250, 250,80)//gradient fill
}

function draw() {
  translate(width/2,width/2)
  x1 = cnt;
  y1 = (a*pow((x1),4))/100
  if(y1>-200 && y1 <200){
    circle(x1*20,y1,5)//draw a circle for a point on the polynomial
    circle(x1*10,y1,5)//draw a circle for a point on the polynomial (modify x)
    circle(x1*5,y1,5)//draw a circle for a point on the polynomial(modify x)
    circle(x1,y1,5)//draw a circle for a point on the polynomial(modify x)
    }
    cnt=cnt+0.2;
    if (cnt>12){//draw the next polynomial
      newCoeff();// function to change coefficients
    }
}
function newCoeff(){
  a = random(-5,5)//change a
  cnt = -12;//reset cnt
  t = t+1;
  if (t> 10){ 
    fill(random(255), random(255), random(255),80)
  }
}