//hold right button to change button's color

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

​

  //button1: press to change color

  if (mouseX > 150 && mouseX < 250 && mouseY > 150 && mouseY < 250 && mouseIsPressed == true) {

    fill(106, 107, 205);

  } else {

    fill(255);

  }

  noStroke();

  rectMode(CENTER);

  rect(200, 200, 100, 100);

​

  //button2: press to change background

  if (mouseX > 25 && mouseX < 125 && mouseY > 150 && mouseY < 250) {

    if (mouseIsPressed) {

      background(0);

    }

    fill(106, 107, 205);

  } else {

    fill(255);

  }

  rectMode(CORNER);

  rect(25, 150, 100, 100);

}