Intraday supports and resistances plotted on your chart!  This indicator will fetch the whole intraday price values to find relevant support and resistance zones for you. “only” 10 support and resistances lines will be plotted.

These lines are reset each day to make them appearing once new support or resistance are found.

The 20 values (10 resistances and 10 supports) are returned and could be used with any automatic trading program

Settings: 

n = periods to find highest high and lowest low for new support / resistance comparing

tolerance = value in point to expand or narrow the old support / resistance value with the new found ones

lookback = period lookback to confirm support and resistance areas

showSupport = true or false

showResistance = true of false

Original code and idea from @Rorschack from this topic: https://www.prorealcode.com/topic/swing-lines-indicator/

//PRC_Dynamic intraday SR | indicator
//23.08.2017
//Nicolas @ www.prorealcode.com
//Sharing ProRealTime knowledge

// --- settings
//n = 20 // highest and lowest period for support/resistance fetch
//tolerance = 5 // should be expressed in points) if there are two (or more) lines that are close to me, then you have to draw a center line
//lookback = 10 // period lookback to confirm support and resistance areas
//showSupport = 1//(0=false , 1=true)
//showResistance = 1 //(0=false , 1=true)
// --- end of settings

maxbars=intradaybarindex

once linear = 0
once lineas = 0
once newlinear = 0
once newlineas = 0
once newlinearr = 0
once newlineass = 0

if showResistance then
 resistance = highest[n](high) 

 if resistance[n-lookback] = resistance[1] then
  linear = (resistance[1] + linear) / 2
 else
  linear = linear
 endif

 if linear[2] = linear[1] and linear[1] = linear then
  newlinear = linear
 endif

 i = 0
 valsup = newlinear + tolerance*pointsize
 valinf = newlinear - tolerance*pointsize

 while i <> maxbars do
  if newlinear[i] = 0 then
   break
  endif
  cond = (newlinear[i] <= valsup and newlinear[i] >= valinf) or (newlineas[i] <= valsup and newlineas[i] >= valinf)
  if cond then
   newlinearr = (newlinear[i] + newlinear)/2
  endif
  i = i+1
 wend

 if intradaybarindex=0 then
  resistancecount = 1
  alphar1 = 0
  alphar2 = 0
  alphar3 = 0
  alphar4 = 0
  alphar5 = 0
  alphar6 = 0
  alphar7 = 0
  alphar8 = 0
  alphar9 = 0
  alphar10 = 0
 endif

 //store last 10 found resistance
 once resistancecount=1
 if  newlinearr<>lastresistance then 
  resistancecount=resistancecount+1
  if resistancecount=1 then
   resistance1=newlinearr
   lastresistance=resistance1
   alphar1 = 255
  endif
 if resistancecount=2 then
  resistance2=newlinearr
  lastresistance=resistance2
  alphar2 = 255
 endif
 if resistancecount=3 then
  resistance3=newlinearr
  lastresistance=resistance3
  alphar3 = 255
 endif
 if resistancecount=4 then
  resistance4=newlinearr
  lastresistance=resistance4
  alphar4 = 255
 endif
 if resistancecount=5 then
  resistance5=newlinearr
  lastresistance=resistance5
  alphar5 = 255
 endif
 if resistancecount=6 then
  resistance6=newlinearr
  lastresistance=resistance6
  alphar6 = 255
 endif
 if resistancecount=7 then
  resistance7=newlinearr
  lastresistance=resistance7
  alphar7 = 255
 endif
 if resistancecount=8 then
  resistance8=newlinearr
  lastresistance=resistance8
  alphar8 = 255
 endif
 if resistancecount=9 then
  resistance9=newlinearr
  lastresistance=resistance9
  alphar9 = 255
 endif
 if resistancecount=10 then
  resistance10=newlinearr
  lastresistance=resistance10
  alphar10 = 255
 endif
 if resistancecount=10 then
  resistancecount=0
 endif
 endif
endif

if showSupport then
 support = lowest[n](low) 

 if support[n-lookback] = support[1] then
  lineas = (support[1] + lineas) / 2
 else
  lineas = lineas
 endif

 if lineas[2] = lineas[1] and lineas[1] = lineas then
  newlineas = lineas
 endif

 i = 0
 valsup = newlineas + tolerance*pointsize
 valinf = newlineas - tolerance*pointsize

 while i <> maxbars do
  if newlineas[i] = 0 then
   break
  endif
  cond = (newlineas[i] <= valsup and newlineas[i] >= valinf) or (newlinear[i] <= valsup and newlinear[i] >= valinf)
  if cond then
   newlineass = (newlineas[i] + newlineas)/2
  endif
  i = i+1
 wend

 if intradaybarindex=0 then
  supportcount = 1
  alphas1 = 0
  alphas2 = 0
  alphas3 = 0
  alphas4 = 0
  alphas5 = 0
  alphas6 = 0
  alphas7 = 0
  alphas8 = 0
  alphas9 = 0
  alphas10 = 0
 endif

 //store last 10 found support
 once supportcount=1
 if  newlineass<>lastsupport then 
  supportcount=supportcount+1
  if supportcount=1 then
   support1=newlineass
   lastsupport=support1
   alphas1 = 255
  endif
  if supportcount=2 then
   support2=newlineass
   lastsupport=support2
   alphas2 = 255
  endif
  if supportcount=3 then
   support3=newlineass
   lastsupport=support3
   alphas3 = 255
  endif
  if supportcount=4 then
   support4=newlineass
   lastsupport=support4
   alphas4 = 255
  endif
  if supportcount=5 then
   support5=newlineass
   lastsupport=support5
   alphas5 = 255
  endif
  if supportcount=6 then
   support6=newlineass
   lastsupport=support6
   alphas6 = 255
  endif
  if supportcount=7 then
   support7=newlineass
   lastsupport=support7
   alphas7 = 255
  endif
  if supportcount=8 then
   support8=newlineass
   lastsupport=support8
   alphas8 = 255
  endif
  if supportcount=9 then
   support9=newlineass
   lastsupport=support9
   alphas9 = 255
  endif
  if supportcount=10 then
   support10=newlineass
   lastsupport=support10
   alphas10 = 255
  endif
  if supportcount=10 then
   supportcount=0
  endif
 endif
endif

RETURN support1 coloured(0,128,0,alphas1) style(point,2),support2 coloured(0,128,0,alphas2)style(point,2),support3 coloured(0,128,0,alphas3)style(point,2),support4 coloured(0,128,0,alphas4)style(point,2),support5 coloured(0,128,0,alphas5)style(point,2),support6 coloured(0,128,0,alphas6)style(point,2),support7 coloured(0,128,0,alphas7)style(point,2),support8 coloured(0,128,0,alphas8)style(point,2),support9 coloured(0,128,0,alphas9)style(point,2),support10 coloured(0,128,0,alphas10)style(point,2),resistance1 coloured(176,23,31,alphar1) style(point,2),resistance2 coloured(176,23,31,alphar2)style(point,2),resistance3 coloured(176,23,31,alphar3)style(point,2),resistance4 coloured(176,23,31,alphar4)style(point,2),resistance5 coloured(176,23,31,alphar5)style(point,2),resistance6 coloured(176,23,31,alphar6)style(point,2),resistance7 coloured(176,23,31,alphar7)style(point,2),resistance8 coloured(176,23,31,alphar8)style(point,2),resistance9 coloured(176,23,31,alphar9)style(point,2),resistance10 coloured(176,23,31,alphar10)style(point,2)

original code and idea from @Rorschack in this topic:
https://www.prorealcode.com/topic/swing-lines-indicator/