def display( B=None, A=None, G=None, D=None, F=None ):
"""Compute and display results.
Note that partial results are possible.
:param F: Aperture, ƒ/
:param G: Guide number in feet
:param A: Film speed, ISO
:param B: Beam Candle Power Seconds
:param D: Subject distance in feet
"""
results= elflash.flash( B=B, A=A, G=G, D=D, F=F )
results.D_m= METRE.from_std( FOOT.to_std( results.D ) )
if results.F is not None:
if abs(results.F-int(results.F)) > .01:
print( "Aperture ...................... ƒ/{F:<4.1f}".format(**results) )
else:
print( "Aperture ...................... ƒ/{F:<4.0f}".format(**results) )
if results.G is not None:
results.G_m= METRE.from_std( FOOT.to_std( results.G ) )
print( "Guide Number (metres) ......... {G_m:7.1f}".format(**results) )
print( "Guide Number (feet) ........... {G:7.1f}".format(**results) )
if results.A is not None:
print( "Film speed .................ISO {A:5.0f}".format(**results) )
if results.B is not None:
print( "Beam Candle Power Seconds ..... {B:5.0f}".format(**results) )
if results.D is not None:
print( "Subject distance (metres) ..... {D_m:7.1f}".format(**results) )
print( "Subject distance (feet) ....... {D:7.1f}".format(**results) )
if results.G is not None:
f_template_1= "Use ƒ/{F:.<4.1f}...........{D_m:5.1f} m. ({D_f:5.1f} ft.)"
f_template_0= "Use ƒ/{F:.<4.0f}...........{D_m:5.1f} m. ({D_f:5.1f} ft.)"
for F, D_f in elflash.aperture_iter( results.G ):
D_m = convert( D_f, FOOT, METRE )
if abs(F-int(F)) > .01:
print( f_template_1.format( D_m=D_m, D_f=D_f, F=F ) )
else:
print( f_template_0.format( D_m=D_m, D_f=D_f, F=F ) )
def solve(find=None):
"""Gather input values for one of the various scenarios.
:param find: The variable we're going to be finding,
this must be one of "B", "A", "G", "D" or "F".
"""
assert find in ( "B", "A", "G", "D", "F" )
if find == 'B' or find == 'D' or find == 'F':
B= None
else:
B= input_float( "ENTER: Beam Candle Power Seconds ..........? " )
if find == 'A' or find == 'D' or find == 'F':
A= None
else:
A= input_float( "ENTER: Film speed ......................ISO? " )
if find == 'G':
G= None
else:
G= input_float( "ENTER: Guide Number (metres)...............? " )
if G is not None:
G= FOOT.from_std( METRE.to_std( G ) )
else:
G= input_float( "ENTER: Guide Number (feet).................? " )
if find == 'D' or find == 'B' or find == 'A':
D= None
else:
D= input_float( "ENTER: Subject distance (metres) ..........? " )
if D is not None:
D= FOOT.from_std( METRE.to_std( D ) )
else:
D= input_float( "ENTER: Subject distance (feet) ............? " )
if find == 'F' or find == 'B' or find == 'A':
F= None
else:
F= input_float( "ENTER: Aperture .........................ƒ/? " )
display( B=B, A=A, G=G, D=D, F=F )
