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Smooth image switching #8 - JS ease-out (drag left/ right, mouse or touch)

A Pen By Ana Tudor Pro

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HTML

            
              <div class='container'>
	<img src='https://images.unsplash.com/photo-1514117445516-2ecfc9c4ec90?ixlib=rb-0.3.5&amp;q=85&amp;fm=jpg&amp;crop=entropy&amp;cs=srgb&amp;ixid=eyJhcHBfaWQiOjE0NTg5fQ&amp;s=0e0b58fcf67fa6e8a010322d617e39af' alt='Mountain massif, sunbathed, partly covered in show.'/>
	<img src='https://images.unsplash.com/photo-1510325805092-2951ab330b7d?ixlib=rb-0.3.5&amp;q=85&amp;fm=jpg&amp;crop=entropy&amp;cs=srgb&amp;ixid=eyJhcHBfaWQiOjE0NTg5fQ&amp;s=017cf46443f4821a375c20e8c68e37f0' alt='Tiny bird with pale brown, orange and white feathers in an evergreen tree.'/>
	<img src='https://images.unsplash.com/photo-1514848567240-a81cb051807a?ixlib=rb-0.3.5&amp;q=85&amp;fm=jpg&amp;crop=entropy&amp;cs=srgb&amp;ixid=eyJhcHBfaWQiOjE0NTg5fQ&amp;s=3a0e476ab712db0eb68ab121a21c54de' alt='Close-up of yellow rose opening up.'/>
	<img src='https://images.unsplash.com/photo-1465408522361-a6f502298219?ixlib=rb-0.3.5&amp;q=85&amp;fm=jpg&amp;crop=entropy&amp;cs=srgb&amp;ixid=eyJhcHBfaWQiOjE0NTg5fQ&amp;s=7a6bd1244c42d1dbd3984a4c13981666' alt='Fast and foamy creek in the middle of the forest.'/>
	<img src='https://images.unsplash.com/photo-1503843778847-2b8bdce2ed3d?ixlib=rb-0.3.5&amp;q=85&amp;fm=jpg&amp;crop=entropy&amp;cs=srgb&amp;ixid=eyJhcHBfaWQiOjE0NTg5fQ&amp;s=d547781176ce182eeeb7303bac05abf4' alt='Fluffy little tabby with blue eyes climbing up a tree.'/>
</div>
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CSS

            
              * { margin: 0 }

body { overflow-x: hidden }

.container {
	--n: 1;
	display: flex;
	align-items: center;
	overflow-y: hidden;
	width: 100%; // fallback
	width: calc(var(--n)*100%);
	height: 50vw; max-height: 100vh;
	transform: translate(calc(var(--i, 0)/var(--n)*-100%));
	
	img {
		width: 100%; // fallback
		width: calc(100%/var(--n));
		user-select: none;
		pointer-events: none
	}
}
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JS

            
              const _C = document.querySelector('.container'), 
      N = _C.children.length, NF = 30, 
			TFN = {
				'linear': function(k) { return k }, 
				'ease-in': function(k, e = 1.675) {
					return Math.pow(k, e)
				}, 
				'ease-out': function(k, e = 1.675) {
					return 1 - Math.pow(1 - k, e)
				}, 
				'ease-in-out': function(k) {
					return .5*(Math.sin((k - .5)*Math.PI) + 1)
				}
			};

let i = 0, x0 = null, locked = false, w, ini, fin, rID = null, anf;

function stopAni() {
  cancelAnimationFrame(rID);
  rID = null
};

function ani(cf = 0) {
  _C.style.setProperty('--i', ini + (fin - ini)*TFN['ease-out'](cf/anf));
	
  if(cf === anf) {
    stopAni();
    return
  }
	
  rID = requestAnimationFrame(ani.bind(this, ++cf))
};

function unify(e) {	return e.changedTouches ? e.changedTouches[0] : e };

function lock(e) {
  x0 = unify(e).clientX;
	locked = true
};

function drag(e) {
  e.preventDefault();
	
  if(locked) {
    let dx = unify(e).clientX - x0, f = +(dx/w).toFixed(2);
		
    _C.style.setProperty('--i', i - f)
  }
};

function move(e) {
  if(locked) {
    let dx = unify(e).clientX - x0, 
        s = Math.sign(dx), 
        f = +(s*dx/w).toFixed(2);
		
    ini = i - s*f;

    if((i > 0 || s < 0) && (i < N - 1 || s > 0) && f > .2) {
      i -= s;
      f = 1 - f
    }

    fin = i;
		anf = Math.round(f*NF);
    ani();
    x0 = null;
    locked = false;
  }
};

function size() { w = window.innerWidth };

size();
_C.style.setProperty('--n', N);

addEventListener('resize', size, false);

_C.addEventListener('mousedown', lock, false);
_C.addEventListener('touchstart', lock, false);

_C.addEventListener('mousemove', drag, false);
_C.addEventListener('touchmove', drag, false);

_C.addEventListener('mouseup', move, false);
_C.addEventListener('touchend', move, false);
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