LED color cycling

[phyton newbi (Gast)]

Hello currently this is my phyton function for cycling through a led 
stripe with all colors:

def cycleLights(self):
                t = threading.currentThread()
                head  = 0               # Index of first 'on' pixel
                tail  = -10             # Index of last 'off' pixel
                color = 0xFF0000        # 'On' color (starts red)

                while getattr(t, "do_run", True):
                        self.strip.setPixelColor(head, color) # Turn on 'head' pixel
                        self.strip.setPixelColor(tail, 0)     # Turn off 'tail'
                        self.strip.show()                     # Refresh strip
                        time.sleep(1.0 / 80)             # Pause 20 milliseconds (~50 fps)

                        head += 1                        # Advance head position
                        if(head >= self.numpixels):           # Off end of strip?
                                head    = 0              # Reset to start
                                color >>= 1              # Red->green->blue->black
                                if(color == 0): color = 0xFF0000 # If black, reset to red

                        tail += 1                        # Advance tail position
                        if(tail >= self.numpixels): tail = 0  # Off end? Reset

But i didn't get all colors how can I achiev to circly through the whole 
spectrum???

[Jim M. (turboj)]

That is much simpler to calculate in HSV color space, since you only 
change the hue value.

So select a color in hsv by changing hue, then translate back to RGB in 
order to control the LEDs.

[guest (Gast)]

Thin about that line:

color >>= 1

and what color values it produce.