how to draw trend line indicator.

hi community.i have created a script.in this script i cn only draw trend lines but i wanted to creat indicator.

//@version=4
//this study simply draws a trend line base on pivot strength configuration，
// and also provide configuration by using the close price and show historical trend lines

study( title=MZR AutoTrendlines, shorttitle=MZR AutoTrendlines, overlay=true)
useclose=input(false)

h=useclose?close:high
l=useclose?close:low

strength=input(10,title=left Strength, minval=5, maxval=200)

draw_trend(High, Low, leftlen,rightlen,n)=>

//upper trend line
var int startx=0
var float starty=0.0
var int startx2=0
var float starty2=0.0

var int endx=0
var float endy=0.0
var float endy0=0.0
var float slope=0.0
var bool ispivothigh =false

ispivothigh:=High[rightlen] == pivothigh(High,leftlen,rightlen)

starty2:=valuewhen(ispivothigh,High[rightlen],n+2)
startx2 := valuewhen(ispivothigh,bar_index,n+2)

starty:=valuewhen(ispivothigh,High[rightlen],n+1)
startx := valuewhen(ispivothigh,bar_index,n+1)

endy:=valuewhen(ispivothigh,High[rightlen],n)
endx := valuewhen(ispivothigh,bar_index,n)

slope:=(endy-starty)/(endx-startx)


valend = endy
var float Endy=0.0

Endy:=abs(endx-startx+rightlen)*slope + starty

if slope<0

    if n==0
        upper0 = line.new(endx, Endy, startx-rightlen, starty,  width = 1, color=color.red, extend=extend.left)
        line.delete(upper0[1])

    upper1 = line.new(endx, Endy, startx-rightlen, starty,  width = 1, color=color.red, extend=extend.none)
    line.delete(upper1[1])

var float slope2= (endy-starty2)/(endx-startx2)
var float Endy2=0.0

Endy:=abs(endx-startx2+rightlen)*slope + starty2
if slope2<0
    upper2 = line.new(endx, Endy2, startx2-rightlen, starty2,  width = 1, color=color.red, extend=extend.none)
    line.delete(upper2[1])

//lower trend line
var int lstartx=0
var float lstarty=0.0
var int lstartx2=0
var float lstarty2=0.0

var int lendx=0
var float lendy=0.0
var float lendy0=0.0
var float lslope=0.0
var bool ispivotlow =false

ispivotlow:=Low[rightlen] == pivotlow(Low,leftlen,rightlen)

lstarty2:=valuewhen(ispivotlow,Low[rightlen],n+2)
lstartx2 := valuewhen(ispivotlow,bar_index,n+2)

lstarty:=valuewhen(ispivotlow,Low[rightlen],n+1)
lstartx := valuewhen(ispivotlow,bar_index,n+1)

lendy:=valuewhen(ispivotlow,Low[rightlen],n)
lendx := valuewhen(ispivotlow,bar_index,n)

lslope:=(lendy-lstarty)/(lendx-lstartx)
var float lEndy=0.0

lEndy:=abs(lendx-lstartx+rightlen)*lslope + lstarty


if lslope>0

    if n==0
        Lower0 = line.new(lendx, lEndy, lstartx-rightlen, lstarty,  width = 1, color=color.green, extend=extend.left)
        line.delete(Lower0[1])

    Lower1 = line.new(lendx, lEndy, lstartx-rightlen, lstarty,  width = 1, color=color.green, extend=extend.none)
    line.delete(Lower1[1])

var float lslope2= (lendy-lstarty2)/(lendx-lstartx2)
var float lEndy2=0.0

lEndy:=abs(lendx-lstartx2+rightlen)*lslope + lstarty2
if lslope2>0
    lower2 = line.new(lendx, lEndy2, lstartx2-rightlen, lstarty2,  width = 1, color=color.green, extend=extend.none)
    line.delete(lower2[1])

left=strength
right=strength

//draw current trendling
draw_trend(h, l,left,right,0)

showhtrend=input(true, title=Show History Trend Line)

if showhtrend
//show history trendling
draw_trend(h, l,left,right,1)
draw_trend(h, l,left,right,2)
draw_trend(h, l,left,right,3)
draw_trend(h, l,left,right,4)
draw_trend(h, l,left,right,5)
draw_trend(h, l,left,right,6)
draw_trend(h, l,left,right,7)
draw_trend(h, l,left,right,8)
draw_trend(h, l,left,right,9)
draw_trend(h, l,left,right,10)
draw_trend(h, l,left,right,11)
draw_trend(h, l,left,right,12)

how to draw trend line indicator.

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