{ Trendline - yearly performance benchmark v3.3

 Option "[1]Calendar days" will plot an uneven
  trendline on charts with missing data bars.

 ©Copyright 2005 Jose Silva.
  The grant of this license is for personal use
   only - no resale or repackaging allowed.
  All code remains the property of Jose Silva.
  http://www.metastocktools.com }

{ User inputs }
StDay:=Input("start Day",1,31,1);
StMnth:=Input("start Month",1,12,1);
StYear:=Input("start Year",1800,2200,2006);
growth:=Input("Trendline Yearly Growth %pa",
 -1000,1000,20);
type:=Input("Trendline based on:  [1]Calendar days,  [2]Bars",1,2,1);
plot:=Input("[1]TrendLine,  [2]Real %pa,  [3]Tline-Real Diff",1,3,1);

{ Date signal }
active:=Year()>StYear
 OR (Year()=StYear AND (Month()>StMnth
 OR Month()=StMnth AND DayOfMonth()>=StDay));
date:=active AND Alert(active=0,2) OR Cum(1)=1;
signal:=date AND Cum(date)=LastValue(Cum(date));

{ Close at date signal }
signalVal:=ValueWhen(1,signal,C);

{ Calendar counter engine }
leap:=Frac(Year()/4)=0 AND Frac(Year()/100)<>0
 OR Frac(Year()/400)=0;
y:=Year()*365+Int(Year()/4)
 -Int(Year()/100)+Int(Year()/400)-730484;
m:=
 If(Month()=2,31-leap,
 If(Month()=3,59,
 If(Month()=4,90,
 If(Month()=5,120,
 If(Month()=6,151,
 If(Month()=7,181,
 If(Month()=8,212,
 If(Month()=9,243,
 If(Month()=10,273,
 If(Month()=11,304,
 If(Month()=12,334,
 -leap)))))))))));
DayNr:=y+m+DayOfMonth();

{ Yearly growth % trendline }
growth:=growth/If(type=1,365,252);
counter:=If(type=2,BarsSince(signal),
 DayNr-ValueWhen(1,signal,DayNr));
trend:=signalVal*(1+counter*growth/100);

{ Actual %pa performance }
actual:=(C/signalVal-1)*36500
 /Max(DayNr-ValueWhen(1,signal,DayNr),.000001);
trend:=If(plot=1,trend,counter*growth);

{ Trendline on price chart, other in own window}
If(plot=3,actual-trend,trend);
If(plot=1,trend,If(plot=2,actual,actual-trend))