3 swings % $
Plot this indicator on top of the price chart. 

The last leg of each swing is dynamic. 
Per1:=Input("1st swing",1,50,5); 
Per2:=Input("2nd swing",2,50,9); 
Per3:=Input("3rd swing",3,50,15); 
D:=Input("Decimal point",.001,100.0,1.0); 
PD:= Input("1= % 2= $",1,2,1); 
A:= If( Rally(), HIGH, 
If( Reaction(), LOW, 
If( Outside(), If( Ref(Rally(),-1), HIGH, LOW ), 
If( Inside(), 
If( Ref(Rally(),-1), Ref(HIGH,-1)-0.001, Ref(LOW,-1)+0.001 ), P 
)))); 
S1:=If(PD=1,Zig(A,(Per1*D),%), Zig(A,(Per1*D),$)); 
S2:= If(PD=1,Zig(A,(Per2*D),%), Zig(A,(Per2*D),$)); 
S3:= If(PD=1,Zig(A,(Per3*D),%), Zig(A,(Per3*D),$)); 
S1; 
S2; 
S3;