applyTrails()

void mood_ring::MoodPainter::applyTrails ( float keep )

private

Definition at line 117 of file mood_painter.cpp.

                                        {
    // Persistence by per-channel max, not accumulation: unity gain by
    // construction, so a static frame yields exactly itself and a keep of
    // zero is a pure passthrough. In float, so a dim tail fades smoothly
    // to nothing instead of stepping 3 -> 2 -> 1 -> 0.
    keep = clampf(keep, 0.0f, 0.98f);
    const fl::size n = mMix.size();
    for (fl::size i = 0; i < n; ++i) {
        RGBf &t = mTrail[i];
        RGBf &live = mMix[i];
        t.r *= keep;
        t.g *= keep;
        t.b *= keep;
        if (t.r < kTrailFloor)
            t.r = 0.0f;
        if (t.g < kTrailFloor)
            t.g = 0.0f;
        if (t.b < kTrailFloor)
            t.b = 0.0f;
        if (live.r > t.r)
            t.r = live.r;
        if (live.g > t.g)
            t.g = live.g;
        if (live.b > t.b)
            t.b = live.b;
        live = t;
    }
}

References mood_ring::RGBf::b, mood_ring::clampf(), mood_ring::RGBf::g, mMix, mTrail, mood_ring::RGBf::r, and t.

Referenced by draw().

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