draw only the last line instead 3 lines

[nkhoi]

Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-1));
Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-2));
Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-3)); <--- this line get draw

the above codes draw only

-3 line.

it doesn't draw -2 and -1

[roonius]

Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-1));
Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-2));
Value.Set(Value[1] + smooth * ((Close[0] - Value[1])-3)); <--- this line get draw

the above codes draw only

-3 line.

it doesn't draw -2 and -1

This is expected since you are using same Value.
You should add more Plots and set their values accordingly