plotSoftDot()

void fl::Luminova::plotSoftDot ( fl::span< CRGB > leds, float fx, float fy, float s ) const

private

Definition at line 74 of file luminova.cpp.hpp.

                                                                                            {
    // Map s (decays from ~3) to a pixel radius 1..3
    float r = fl::clamp<float>(s * 0.5f, 1.0f, 3.0f);
    int R = static_cast<int>(fl::ceil(r));
    // Avoid roundf() to prevent AVR macro conflicts; do manual symmetric rounding
    int cx = static_cast<int>(fx + (fx >= 0.0f ? 0.5f : -0.5f));
    int cy = static_cast<int>(fy + (fy >= 0.0f ? 0.5f : -0.5f));
    float r2 = r * r;
    for (int dy = -R; dy <= R; ++dy) {
        for (int dx = -R; dx <= R; ++dx) {
            float d2 = static_cast<float>(dx * dx + dy * dy);
            if (d2 <= r2) {
                float fall = 1.0f - (d2 / (r2 + 0.0001f));
                float vf = 255.0f * fall;
                if (vf < 0.0f) vf = 0.0f;
                if (vf > 255.0f) vf = 255.0f;
                u8 v = static_cast<u8>(vf);
                plotDot(leds, cx + dx, cy + dy, v);
            }
        }
    }
}

References fl::ceil(), fl::clamp(), fl::FL_NO_EXCEPT, leds, and plotDot().

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