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```#rotozoom graphics raster demo Tkinter
#by Antoni Gual

import tkinter
from math import sin,cos
from random  import randint
x,y=320,200

class App:
def __init__(self, t):
self.img = tkinter.PhotoImage(width=x,height=y)
self.c = tkinter.Label(t,image=self.img);self.c.pack()
t.after_idle(self.do_rotozoom)
self.ang=0

def do_rotozoom(self):
self.ang=(self.ang+1)%100
cs1=cs[self.ang]
ss1=ss[self.ang]
self.img.put((" ".join((("{"+" ".join(clr[((i*cs1-j*ss1) & (j*cs1+i*ss1))//256]
for i in range(-160,159)))+"}" for j in range(-100,99)))))
t.after(20,self.do_rotozoom)

#precalculate trig
cs,ss,ang=[],[],0
for i in range(100):
aa=abs(sin(ang))*255
cs.append(int(cos(ang)*aa))
ss.append(int(sin(ang)*aa))
ang+=0.062832
#precalculate a b/w color table
clr=[]
for i in range(256):
clr.append( "#{:06x}".format(i*0x10101))

t=tkinter.Tk()
a = App(t )
t.mainloop()
```

#### Diff to Previous Revision

```--- revision 3 2015-05-05 20:02:34
+++ revision 4 2015-05-05 20:26:41
@@ -24,7 +24,7 @@
#precalculate trig
cs,ss,ang=[],[],0
for i in range(100):
-    aa=abs(sin(ang)+.4)*255
+    aa=abs(sin(ang))*255
cs.append(int(cos(ang)*aa))
ss.append(int(sin(ang)*aa))
ang+=0.062832
```