DiffClamp.js

class DiffClamp {
  constructor(min, max) {
    this.min = min;
    this.max = max;
    this.lastValue = 0;
    this.value = 0;
  }

  getValue(value) {
    const diff = value - this.lastValue;
    this.lastValue = value;
    this.value = Math.min(Math.max(this.value + diff, this.min), this.max);
    return this.value;
  }
}