Class TimeRamp

src/fl/math/time_alpha.h:63–99

* amplitude * ^ * 255 ─────────────────────── * / \ * / \ * / \ * / \ * 0 ────────────┴ ┴──────────────────> time (ms) * t0 t1 t2 t4 * * * */

 *
 */
class TimeRamp : public TimeAlpha {
  public:
    /// @param latchMs     total active time (ms)
    /// @param risingTime  time to ramp from 0→255 (ms)
    /// @param fallingTime time to ramp from 255→0 (ms)
    TimeRamp(u32 risingTime, u32 latchMs, u32 fallingTime) FL_NOEXCEPT;

    /// Call this when you want to (re)start the ramp cycle.
    /// Smart re-trigger that preserves state when already active:
    /// - If in plateau: extends the plateau time
    /// - If falling: reverses back to plateau
    /// - If rising: continues rising
    /// - If inactive: starts new cycle
    void trigger(u32 now) FL_NOEXCEPT override;

    /// @return true iff we're still within the latch period.
    bool isActive(u32 now) const FL_NOEXCEPT override;

    /// Get the current phase of the ramp
    RampPhase getCurrentPhase(u32 now) const FL_NOEXCEPT;

    /// Compute current 0–255 output based on how much time has elapsed since
    /// trigger().
    u8 update8(u32 now) FL_NOEXCEPT override;

  private:
    u32 mLatchMs;
    u32 mRisingTime;
    u32 mFallingTime;

    u32 mFinishedRisingTime = 0;
    u32 mFinishedPlateauTime = 0;
    u32 mFinishedFallingTime = 0;

    u32 mStart = 0;
    u8 mLastValue = 0;
};

/*
 *                       amplitude