let index = 0;

​

function setup() {

  createCanvas(400, 400);

  frameRate(3);

}

​

function draw() {

  background(0);

  sevenSegment(nums[index]);

  index = (index + 1) % nums.length;

}

​

function getColour(val, shift) {

  let r = map((val >> shift) & 1, 0, 1, 50, 255);

  let g = 0;

  let b = 0;

  let a = 255;

  return color(r, g, b, a);

}

​

function sevenSegment(val) {

  push();

  stroke(0);

  noFill();

  // A

  fill(getColour(val, 6));

  rect(60, 20, 78, 18, 10);

  // B

  fill(getColour(val, 5));

  rect(140, 40, 18, 98, 10);

  // C

  fill(getColour(val, 4));

  rect(140, 160, 18, 98, 10);

  // D

  fill(getColour(val, 3));

  rect(60, 260, 78, 18, 10);

  // E

  fill(getColour(val, 2));

  rect(40, 160, 18, 98, 10);

  // F

  fill(getColour(val, 1));

  rect(40, 40, 18, 98, 10);

  // G

  fill(getColour(val, 0));

  rect(60, 140, 78, 18, 10);

  pop();

}