falloff()

float mood_ring::falloff	(	float	distance,
		float	sigma )

Smooth bump: 1 at distance 0, 0 at distance >= sigma.

Definition at line 49 of file ring_canvas.cpp.

                                           {
    if (sigma <= 0.0f)
        return 0.0f;
    float t = 1.0f - distance / sigma;
    if (t <= 0.0f)
        return 0.0f;
    if (t >= 1.0f)
        return 1.0f;
    return t * t * (3.0f - 2.0f * t);
}

References t.

Referenced by mood_ring::RingCanvas::lobe(), and mood_ring::RingCanvas::ring().

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