var line1, line2, line3;

​

function setup() { 

  createCanvas(windowWidth, windowHeight);

  drawScene1();

} 

​

​

function draw() { 

​

}

​

​

function drawScene1(){

  background(220);

  // do some stuff

  //button = createImg('mod.png'); //button can be any png image

  button1 = createButton ("button1");

  button1.mousePressed(drawScene2);

  button1.position(width/2,height/2);

  line1=text("SCENE 1",width/2,10);

}

​

function drawScene2(){

  background(160);

  // do some stuff

  button1.hide();

  button2 = createButton ("button2");

  button2.mousePressed(drawScene3);

  button2.position(width/2,height/4);

  line2=text("SCENE 2",width/2,10);

}

​

function drawScene3(){

  background(120);

  // do some stuff

  button2.hide();

  button3 = createButton ("button3");

  button3.mousePressed(drawScene4);

  button3.position(width/2,height/8);

  line3=text("SCENE 3",width/2,10);

}

​

function drawScene4(){

  background(80);

  // do some stuff

  button3.hide();

  line4=text("SCENE 4",width/2,10);

}