def trace(self, t):
# Computes attenuations at all points at time t.
mask = np.copy( self.base_mask )
for pos,fracarea in self.spots:
if hasattr(fracarea, '__call__'): # is fracarea a lambda?
theta = geometry.cap_half_angle( fracarea(t) )
else: # or a constant
theta = geometry.cap_half_angle( fracarea )
pos_t = self.target.evolve(pos, -t)
mask[ self.target.occlude(pos_t, theta, self.points) ] = 0
return mask
def rv(self, t): # area => spot area
# Computes approximate mean RV time t.
rv_all = 0
for pos,fracarea in self.spots:
pos_t = self.target.evolve(pos, -t) / self.target.radius
if pos_t[2] < 0:
# behind star
continue
if hasattr(fracarea, '__call__'): # is fracarea a lambda?
theta = geometry.cap_half_angle( fracarea(t) )
else: # or a constant
theta = geometry.cap_half_angle( fracarea )
area = math.pi * math.sin(theta)**2
area *= math.sqrt(1 - pos_t[0]**2 - pos_t[1]**2 ) # perspective
R = self.target.radius
rv = self.max_rv * pos_t[0]
ld = physics.default_limb_darkening(math.acos( pos_t[2] ))
rv_all -= area * rv * ld
return rv_all
