draw()

void draw

(

uint32_t

now

)

Definition at line 73 of file FxNoiseRing.ino.

                        {
    double angle_offset = double(now) / 32000.0 * 2 * M_PI;
    now = (now << timeBitshift.as<int>()) * timescale.as<double>();
    // go in circular formation and set the leds
    for (int i = 0; i < NUM_LEDS; i++) {
        // Sorry this is a little convoluted but we are applying noise
        // in the 16-bit space and then mapping it back to 8-bit space.
        // All the constants were experimentally determined.
        float angle = i * 2 * M_PI / NUM_LEDS + angle_offset;
        float x = cos(angle);
        float y = sin(angle);
        x *= 0xffff * scale.as<double>();
        y *= 0xffff * scale.as<double>();
        uint16_t noise = inoise16(x, y, now);
        uint16_t noise2 = inoise16(x, y, 0xfff + now);
        uint16_t noise3 = inoise16(x, y, 0xffff + now);
        noise3 = noise3 >> 8;
        int16_t noise4 = map(noise3, 0, 255, -64, 255);
        if (noise4 < 0) {  // Clamp negative values to 0.
            noise4 = 0;
        }
        // Shift back to 8-bit space.
        leds[i] = CHSV(noise >> 8, MAX(128, noise2 >> 8), noise4);
    }
}

References inoise16(), leds, M_PI, MAX, noise, noise2, NUM_LEDS, scale, timeBitshift, timescale, x, and y.

Referenced by loop().

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