Source
static num easeOutBounce(num ratio) {
if (ratio < 1 / 2.75) {
return 7.5625 * ratio * ratio;
} else if (ratio < 2 / 2.75) {
ratio = ratio - 1.5 / 2.75;
return 7.5625 * ratio * ratio + 0.75;
} else if (ratio < 2.5 / 2.75) {
ratio = ratio - 2.25 / 2.75;
return 7.5625 * ratio * ratio + 0.9375;
} else {
ratio = ratio - 2.625 / 2.75;
return 7.5625 * ratio * ratio + 0.984375;
}
}