File content as of revision 2:bb9ebad05691:

#include "shift_effect.h"
#include "colors.h"

namespace Effects {

    ShiftEffect::ShiftEffect(NeoPixelString * pixelstring, int delay_ms, neopixel::Pixel color, int groupsize)
        : Effect(pixelstring, delay_ms) {
    
        this->color = color;
        this->groupsize = groupsize;
        state = FIRST_TIME;
    }
    
    void ShiftEffect::execute(void) {
        Effect::execute();

        if (state == FIRST_TIME) {
            for (unsigned i = 0; i < getPixelString()->getLength(); i++) {
                if (i % groupsize == 0) {
                    getPixelString()->setPixel(i, color);
                } else {
                    getPixelString()->setPixel(i, Colors::Black);
                }
            }

            state = RUNNING;
        } else {

            unsigned int i = 0;
            neopixel::Pixel pix;
            neopixel::Pixel first;

            while (i < getPixelString()->getLength()) {
                unsigned int group = i / groupsize;

                if (i % groupsize == 0) {
                    first = getPixelString()->getPixel(i);
                }

                if (i == ((group+1)*groupsize)-1) { // last pix in group
                    getPixelString()->setPixel(i, first);
                } else {
                    pix = getPixelString()->getPixel(i+1);
                    getPixelString()->setPixel(i, pix);
                }

                i++;
            }

        }
        getPixelString()->update();
    }

};