Class TimeClampedTransition

src/fl/math/time_alpha.h:115–170

* amplitude * ^ * 255 ────────────────────────────────────── * / * / * / * / * 0 ────────────┴ --> time (ms) * t0 t1 * * * */

 *
 */
class TimeClampedTransition : public TimeAlpha {
  public:
    TimeClampedTransition(u32 duration) FL_NOEXCEPT : mDuration(duration) {}

    void trigger(u32 now) FL_NOEXCEPT override {
        mStart = now;
        mEnd = now + mDuration;
    }

    bool isActive(u32 now) const FL_NOEXCEPT override {
        bool not_started = (mEnd == 0) && (mStart == 0);
        if (not_started) {
            // if we have not started, we are not active
            return false;
        }
        if (now < mStart) {
            // if the time is before the start, we are not active
            return false;
        }
        if (now > mEnd) {
            // if the time is after the finished rising, we are not active
            return false;
        }
        return true;
    }

    u8 update8(u32 now) FL_NOEXCEPT override {
        bool not_started = (mEnd == 0) && (mStart == 0);
        if (not_started) {
            // if we have not started, we are not active
            return 0;
        }
        u8 out = time_alpha8(now, mStart, mEnd);
        return out;
    }

    float updatef(u32 now) FL_NOEXCEPT override {
        bool not_started = (mEnd == 0) && (mStart == 0);
        if (not_started) {
            return 0;
        }
        float out = time_alphaf(now, mStart, mEnd);
        if (mMaxClamp > 0.f) {
            out = fl::min(out, mMaxClamp);
        }
        return out;
    }

    void set_max_clamp(float max) FL_NOEXCEPT { mMaxClamp = max; }

  private:
    u32 mStart = 0;
    u32 mDuration = 0;
    u32 mEnd = 0;
    float mMaxClamp = -1.f; // default disabled.
};

} // namespace fl