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# Copyright (C) 2010, 2009 Oscar Perpiñán Lamigueiro
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#/
fSombra2X<-function(angGen,distances,struct){
stopifnot(is.list(struct),is.data.frame(distances))
###Preparo datos de partida
P=with(struct,distances/W)
b=with(struct,L/W)
AzS=coredata(angGen$AzS)
Beta=coredata(angGen$Beta)
AlS=coredata(angGen$AlS)
###Cálculos
d1=abs(P$Lew*cos(AzS)-P$Lns*sin(AzS))
d2=abs(P$Lew*sin(AzS)+P$Lns*cos(AzS))
FC=sin(AlS)/sin(Beta+AlS)
s=b*cos(Beta)+(b*sin(Beta)+P$H)/tan(AlS)
FS1=1-d1
FS2=s-d2
SombraCond=(FS1>0)*(FS2>0)*(P$Lew*AzS>=0)
SombraCond[is.na(SombraCond)]<-FALSE #Los NA no me sirven en un vector lógico. Los sustituyo por FALSE
###Resultado
FS=SombraCond*(FS1*FS2*FC)/b
FS[FS>1]<-1
return(zoo(FS, index(angGen)))
}
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