RosettaCodeData/Task/Angles-geometric-normalizat.../FreeBASIC/angles-geometric-normalizat...

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#define PI 3.1415926535897932384626433832795028842
#define INVALID -99999
function clamp( byval n as double, lo as double, hi as double ) as double
while n <= lo
n += (hi - lo)/2
wend
while n >= hi
n += (lo - hi)/2
wend
return n
end function
function anglenc( byval angle as double, byval source as string, byval targ as string ) as double
source = ucase(source)
targ = ucase(targ)
select case source
case "D":
angle = clamp(angle, -360, 360)
select case targ
case "D":
return angle
case "G":
return angle*10/9
case "M":
return angle*160/9
case "R":
return angle*PI/180
case "T":
return angle/360
case else
return INVALID
end select
case "G":
angle = clamp(angle, -400, 400)
select case targ
case "D":
return angle*9/10
case "G":
return angle
case "M":
return angle*16
case "R":
return angle*PI/200
case "T":
return angle/400
case else
return INVALID
end select
case "M":
angle = clamp(angle, -6400, 6400)
select case targ
case "D":
return angle*9/160
case "G":
return angle/16
case "M":
return angle
case "R":
return angle*PI/3200
case "T":
return angle/6400
case else
return INVALID
end select
case "R":
angle = clamp(angle, -2*PI, 2*PI)
select case targ
case "D":
return angle*180/PI
case "G":
return angle*200/PI
case "M":
return angle*3200/PI
case "R":
return angle
case "T":
return angle/(2*PI)
case else
return INVALID
end select
case "T":
angle = clamp(angle, -1, 1)
select case targ
case "D":
return angle*360
case "G":
return angle*400
case "M":
return angle*6400
case "R":
return angle*2*PI
case "T":
return angle
case else
return INVALID
end select
case else:
return INVALID
end select
end function
function clip( st as string, num as uinteger ) as string
if len(st)<num then return st
return left(st, num)
end function
dim as string scales = "DGMRT", source, targ
dim as double angles(12) = {-2, -1, 0, 1, 2, 6.2831853, 16, 57.2957795, 359, 399, 6399, 1000000}
print "Angle Normalised Unit | D G M R T"
for k as ubyte = 0 to 11
for i as ubyte = 1 to 5
source = mid(scales,i,1)
print angles(k), clip(str(anglenc(angles(k), source, source )), 10), source, "|",
for j as ubyte = 1 to 5
targ = mid(scales, j, 1)
print clip(str(anglenc(angles(k), source, targ )), 10),
next j
print
next i
next k