let curPos;

let amount = 0;

let div = 128;

let clicked = false;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  posA = createVector(width / 5, height / 2);

  posB = createVector(width - width / 5, height / 2);

  curPos = posA;

}

​

function draw() {

  background(0);

  fill(255);

  noStroke();

  if (amount < 1.0 && clicked) {

    amount += 1.0 / div;

    let easing = easeInOutExpo(amount);

    curPos = p5.Vector.lerp(posA, posB, easing);

  }

  circle(curPos.x, curPos.y, 80);

}

​

function mouseClicked() {

  curPos = posA;

  amount = 0.0;

  clicked = true;

}

​

//easing functions

const c1 = 1.70158;

const c2 = c1 * 1.525;

const c3 = c1 + 1;

const PI = Math.PI;

const c4 = (2 * PI) / 3;

const c5 = (2 * PI) / 4.5;

​

function easeInQuad(x) {

  return x * x;

}

​

function easeOutQuad(x) {

  return 1 - (1 - x) * (1 - x);

}

​

function easeInOutQuad(x) {

  return x < 0.5 ? 2 * x * x : 1 - pow(-2 * x + 2, 2) / 2;

}

​

function easeInCubic(x) {

  return x * x * x;

}

​

function easeOutCubic(x) {

  return 1 - pow(1 - x, 3);

}

​

function easeInOutCubic(x) {

  return x < 0.5 ? 4 * x * x * x : 1 - pow(-2 * x + 2, 3) / 2;

}

​

function easeInQuart(x) {

  return x * x * x * x;

}

​

function easeOutQuart(x) {

  return 1 - pow(1 - x, 4);

}

​

function easeInOutQuart(x) {

  return x < 0.5 ? 8 * x * x * x * x : 1 - pow(-2 * x + 2, 4) / 2;

}

​

function easeInQuint(x) {

  return x * x * x * x * x;

}

​

function easeOutQuint(x) {

  return 1 - pow(1 - x, 5);

}

​

function easeInOutQuint(x) {

  return x < 0.5 ? 16 * x * x * x * x * x : 1 - pow(-2 * x + 2, 5) / 2;

}

​

function easeInSine(x) {

  return 1 - cos((x * PI) / 2);

}

​

function easeOutSine(x) {

  return sin((x * PI) / 2);

}

​

function easeInOutSine(x) {

  return -(cos(PI * x) - 1) / 2;

}

​

function easeInExpo(x) {

  return x === 0 ? 0 : pow(2, 10 * x - 10);

}

​

function easeOutExpo(x) {

  return x === 1 ? 1 : 1 - pow(2, -10 * x);

}

​

function easeInOutExpo(x) {

  return x === 0

    ? 0

    : x === 1

    ? 1

    : x < 0.5

    ? pow(2, 20 * x - 10) / 2

    : (2 - pow(2, -20 * x + 10)) / 2;

}

​

function easeInCirc(x) {

  return 1 - sqrt(1 - pow(x, 2));

}

​

function easeOutCirc(x) {

  return sqrt(1 - pow(x - 1, 2));

}

​

function easeInOutCirc(x) {

  return x < 0.5

    ? (1 - sqrt(1 - pow(2 * x, 2))) / 2

    : (sqrt(1 - pow(-2 * x + 2, 2)) + 1) / 2;

}

​

function easeInBack(x) {

  return c3 * x * x * x - c1 * x * x;

}

​

function easeOutBack(x) {

  return 1 + c3 * pow(x - 1, 3) + c1 * pow(x - 1, 2);

}

​

function easeInOutBack(x) {

  return x < 0.5

    ? (pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2

    : (pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2;

}

​

function easeInElastic(x) {

  return x === 0

    ? 0

    : x === 1

    ? 1

    : -pow(2, 10 * x - 10) * sin((x * 10 - 10.75) * c4);

}

​

function easeOutElastic(x) {

  return x === 0

    ? 0

    : x === 1

    ? 1

    : pow(2, -10 * x) * sin((x * 10 - 0.75) * c4) + 1;

}

​

function easeInOutElastic(x) {

  return x === 0

    ? 0

    : x === 1

    ? 1

    : x < 0.5

    ? -(pow(2, 20 * x - 10) * sin((20 * x - 11.125) * c5)) / 2

    : (pow(2, -20 * x + 10) * sin((20 * x - 11.125) * c5)) / 2 + 1;

}

​

function easeInBounce(x) {

  return 1 - bounceOut(1 - x);

}

​

function easeOutBounce(x) {

  return 1 + bounceOut(x - 1);

}

​

function easeInOutBounce(x) {

  return x < 0.5

    ? (1 - bounceOut(1 - 2 * x)) / 2

    : (1 + bounceOut(2 * x - 1)) / 2;

}

​

function bounceOut(x) {

  const n1 = 7.5625;

  const d1 = 2.75;

​

  if (x < 1 / d1) {

    return n1 * x * x;

  } else if (x < 2 / d1) {

    return n1 * (x -= 1.5 / d1) * x + 0.75;

  } else if (x < 2.5 / d1) {

    return n1 * (x -= 2.25 / d1) * x + 0.9375;

  } else {

    return n1 * (x -= 2.625 / d1) * x + 0.984375;

  }

}

​