just-animate/lib.es2015/lib/reducers/tick.js

_Making Animation Simple_

import { _ } from '../utils/constants';
import { inRange } from '../utils/math';
import { finish } from './finish';
import { update } from './update';
export const tick = (model, delta, _ctx) => {
    const duration = model.duration;
    const repeat = model.repeat;
    const rate = model.rate;
    let time = model.time === _ ? (rate < 0 ? duration : 0) : model.time;
    let round = model.round || 0;
    const isReversed = rate < 0;
    time += delta * rate;
    let iterationEnded = false;
    if (!inRange(time, 0, duration)) {
        model.round = ++round;
        time = isReversed ? 0 : duration;
        iterationEnded = true;
        if (model.yoyo) {
            model.rate = (model.rate || 0) * -1;
        }
        time = model.rate < 0 ? duration : 0;
    }
    model.time = time;
    model.round = round;
    if (iterationEnded && repeat === round) {
        finish(model, _, _ctx);
        return;
    }
    update(model, _, _ctx);
};