1 # compute arctangent table for CORDIC computations in fttrigon.c
4 #units = 64*65536.0 # don't change !!
11 print "table of arctan( 1/2^n ) for PI = " + repr(units/65536.0) + " units"
15 x = 0.5**n # tangent value
17 angle = math.atan(x) # arctangent
18 angle2 = round(angle*scale) # arctangent in FT_Angle units
23 sys.stdout.write( comma + repr( int(angle2) ) )
26 shrink /= math.sqrt( 1 + x*x )
29 print "shrink factor = " + repr( shrink )
30 print "shrink factor 2 = " + repr( int( shrink * (2**32) ) )
31 print "expansion factor = " + repr( 1/shrink )