draw()

void fl::Fire2012::draw ( DrawContext context )

inlineoverridevirtual

Parameters

now	The current time in milliseconds. Fx writers are encouraged to use this instead of millis() directly as this will more deterministic behavior.

Implements fl::Fx.

Definition at line 61 of file fire2012.h.

                                            {
        CRGB *leds = context.leds;
        if (leds == nullptr) {
            return;
        }
 
        // Step 1.  Cool down every cell a little
        for (uint16_t i = 0; i < mNumLeds; i++) {
            heat[i] =
                qsub8(heat[i], random8(0, ((cooling * 10) / mNumLeds) + 2));
        }
 
        // Step 2.  Heat from each cell drifts 'up' and diffuses a little
        for (uint16_t k = mNumLeds - 1; k >= 2; k--) {
            heat[k] = (heat[k - 1] + heat[k - 2] + heat[k - 2]) / 3;
        }
 
        // Step 3.  Randomly ignite new 'sparks' of heat near the bottom
        if (random8() < sparking) {
            int y = random8(7);
            heat[y] = qadd8(heat[y], random8(160, 255));
        }
 
        // Step 4.  Map from heat cells to LED colors
        for (uint16_t j = 0; j < mNumLeds; j++) {
            // Scale the heat value from 0-255 down to 0-240
            // for best results with color palettes.
            uint8_t colorindex = scale8(heat[j], 240);
            CRGB color = ColorFromPalette(palette, colorindex);
            int pixelnumber;
            if (reverse_direction) {
                pixelnumber = (mNumLeds - 1) - j;
            } else {
                pixelnumber = j;
            }
            leds[pixelnumber] = color;
        }
    }

References ColorFromPalette(), cooling, heat, fl::_DrawContext::leds, leds, fl::Fx::mNumLeds, palette, qadd8(), qsub8(), random8(), reverse_direction, scale8(), sparking, and y.

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