var colors=["red","green","blue"]

var index=0;

​

​

function setup() {

  createCanvas(500, 400);

}

​

function draw() {

  background(220);

  fill(colors[index]);

  stroke(255);

  // noFill(0);

  for(let i=0;i<4;i++){

  circle(i*100+100,200,sizes[i],sizes[i]);

  // circle(200,200,sizes[i],sizes[i]);

  // circle(300,200,sizes[i],sizes[i]);

  // circle(400,200,sizes[i],sizes[i]);

  }

  // circle(350,100,sizes[index]);

}

​

function mousePressed(){

  index=index+1;

  // if(index==sizes.length){

  //   index=0;

  // }

    if(index==colors.length){

    index=0;

  }

}