File content as of revision 0:6b847e039b3b:

#include "mbed.h"
#include "WS2812.h"
#include "PixelArray.h"

#define WS2812_BUF 60

WS2812 ws(p5,WS2812_BUF);
PixelArray px(WS2812_BUF);

int main()
{

    ws.useII(2); // use per-pixel intensity scaling

    // set up the colours we want to draw with
    int colorbuf[6] = {0x2f0000,0x2f2f00,0x002f00,0x002f2f,0x00002f,0x2f002f};

    while(1) {

        // h is the starting point, incrementing makes the rendered buffer rotate
        for (int h=0; h<60; h++) {

            // for each of the colours (j) write out 10 of them
            // the pixel get written at the rotation offset, plus the colour*10, plus the colour position
            // all modulus 60 so it wraps around
            for (int i =0; i<6; i++) {
                for (int j=0; j<10; j++) {
                    px.Set((h+(i*10)+j)%60,colorbuf[i]);
                }
            }

            // now all the colours are computed, add a fade effect
            // compute and write the II value for each pixel
            for (int j=0; j<60; j++) {
                // px.SetI(pixel position, II value)
                px.SetI(    (h+j)%60,   0xf+(0xf*(j%10)));
            }

            ws.write(px.getBuf()); // write out the buffer
            wait(0.05);
        }
    }
}