Color Wheel

# Color Wheel
# Joe, 19/12/2014
import appuifw as A
import graphics as G
from math import cos,sin,pi

rad=lambda x:x*pi/180.0

def h2r(h,s,v):
 if s==0.0: return v,v,v
 i=int(h*6.0)
 f=(h*6.0)-i
 p=v*(1.0-s)
 q=v*(1.0-s*f)
 t=v*(1.0-s*(1.0-f))
 if i%6==0:return v,t,p
 if i==1:return q,v,p
 if i==2:return p,v,t
 if i==3:return p,q,v
 if i==4:return t,p,v
 if i==5:return v,p,q

def gen(n=256):
 hsv=[(x*0.9/n,0.6,0.9) for x in xrange(n)]
 rgb=map(lambda x: tuple(map(lambda x:int(x*255), h2r(*x))),hsv)
 return rgb

run=1
w,h=G.sysinfo.display_pixels()
img=G.Image.new((w,h))

def stop():
 global run
 run=0

def draw(x):
 c.blit(img)

A.app.screen='full'
c=A.Canvas(redraw_callback=draw)
A.app.body=c
A.app.exit_key_handler=stop

N=360
col=gen(N)
cx,cy=w/2,h/2
rr=80
for i in range(h+1):
 img.line((0,h-i,w,h-i),col[i])
 draw(())
 A.e32.ao_sleep(1e-04)
for i in range(N):
 x1=cx+rr*cos(rad(i))
 y1=cy+rr*-sin(rad(i))
 img.line((cx,cy,x1,y1),col[i],0,2)
 draw(())
 A.e32.ao_sleep(1e-04)

while run:
 img.text((5,h-10),u'Color Wheel \u00a9 2014, Joe',0xffffff)
 draw(())
 A.e32.ao_sleep(1e-04)