How to draw a coloured box automatically on a chart outside the US session?

• 03/25/2023 at 11:40 PM #212111
  anilkc

  I want to create an indicator to draw a box automatically on the chart around the candles that were outside the US session. The high and low of the box would be high and the low during those subsequent sessions (i.e., Asia & Europe) and the width would be from the start of the Asia session and the end of the Europe session. I would like the indicator to display the last 10 non-US sessions. Is this doable?

  

  anilkc

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  03/26/2023 at 12:21 AM #212112
  anilkc

  Here is my code which I’m not able to get to work.

   

  startSession = 1700 // Start time for US futures trading session
  endSession = 1515 // End time for US futures trading session (next day)
  sessionsToCheck = 10 // Number of non-US futures trading sessions to check

  for i = 1 to sessionsToCheck
  startSession = Date() – i * 7 // Calculate start date for previous non-US futures trading session
  endSession = Date() – (i – 1) * 7 // Calculate end date for previous non-US futures trading session
  if dayofweek(startSession) = 5 then startSession = startSession – 1 // Adjust start date if it falls on a Saturday
  if dayofweek(endSession) = 5 then endSession = endSession – 1 // Adjust end date if it falls on a Saturday

  if time >= endSession or time < startSession then // Check if current bar is outside US futures trading session
  if time >= endSession or time < startSession then // Check if current bar is outside previous non-US futures trading session
  x1 = barindex – 1 // Set x-coordinate of top left corner of rectangle to one bar ago
  y1 = max(high[x1], high[x1+1]) // Set y-coordinate of top left corner of rectangle to maximum of two previous highs
  x2 = barindex // Set x-coordinate of bottom right corner of rectangle to current bar
  y2 = min(low[x2], low[x2-1]) // Set y-coordinate of bottom right corner of rectangle to minimum of current low and previous low
  DRAWRECTANGLE(x1, y1, x2, y2) colored(255, 0, 0) // Draw rectangle with red color
  endif
  endif
  endfor

  

  anilkc

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  03/26/2023 at 12:18 PM #212131
  robertogozzi

  There are so many syntax errors.

  Each IF must be closed by ENDIF (on separate lines).

  ENDFOR doesn’t exits, replace it with NEXT.

  [n] must be used to reference prior bars, instead of (). Within brackets 0 (or no brackets at all) means the current bar, any greater integer value means bars prior to the current one.

  THEN can only be followed by comments (starting with // or REM), any other character must be on a separate line below it.

  TIME must be a 6-digit value formatted as HHMMSS (SS is 00 for TFs >= 1 minute). Only leading 0s can be omitted (but for clarity I suggest to always use 6 digits).

  This code should do:

  DEFPARAM DrawOnLastBarOnly = true startSession = 170000 // Start time for US futures trading session endSession = 151500 // End time for US futures trading session (next day) IF (OpenTime = StartSession) OR ((OpenTime > StartSession) AND (OpenTime[1] < StartSession)) THEN Bar1 = BarIndex HH = high LL = low ENDIF IF (OpenTime >= StartSession) OR (OpenTime < EndSession) THEN HH = max(HH,high) LL = min(LL,low) Bar2 = BarIndex ENDIF DrawSegment(Bar1,HH,Bar2,HH) coloured("Blue",255) DrawSegment(Bar1,LL,Bar2,LL) coloured("Red",255) RETURN

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

  DEFPARAM DrawOnLastBarOnly = true startSession = 170000 // Start time for US futures trading session endSession   = 151500 // End time for US futures trading session (next day) IF (OpenTime = StartSession) OR ((OpenTime > StartSession) AND (OpenTime[1] < StartSession)) THEN    Bar1 = BarIndex    HH   = high    LL   = low ENDIF IF (OpenTime >= StartSession) OR (OpenTime < EndSession) THEN    HH   = max(HH,high)    LL   = min(LL,low)    Bar2 = BarIndex ENDIF DrawSegment(Bar1,HH,Bar2,HH) coloured("Blue",255) DrawSegment(Bar1,LL,Bar2,LL) coloured("Red",255) RETURN

  to display the last 10 sessions, arrays are needed.

  I may code them, if you can’t, but first I need to know it works as expected.

   

   

  

  robertogozzi

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  03/26/2023 at 8:35 PM #212165
  anilkc

  Many thanks, Roberto. Let me give this a try and I’ll get back to you.

  

  anilkc

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  03/26/2023 at 10:23 PM #212166
  anilkc

  I looked, and it’s drawing horizontal lines across the high and low of the US session. How do I get it for non-US sessions and close the box with vertical lines on either side of the horizontal lines? Ideally, I’d like to colour the whole box area so that it is apparent which candles were formed outside the US session. Can it draw it for the last 10 non-US sessions?

   

   

  

  anilkc

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  03/27/2023 at 1:03 PM #212187
  anilkc

  I tried modifying the code using an array but I get an error.

  DEFPARAM DrawOnLastBarOnly = true
  startSession = 170000 // Start time for US futures trading session
  endSession = 151500 // End time for US futures trading session (next day)

  // Define array to store high and low values for each session
  Array: highLow[10,2](0)

  // Loop through last 10 sessions and store high and low values
  For i = 0 To 9
  If (OpenTime = StartSession – i*10000) OR ((OpenTime > StartSession – i*10000) AND (OpenTime[1] < StartSession – i*10000)) THEN
  Bar1 = BarIndex
  highLow[i,0] = high
  highLow[i,1] = low
  Endif

  If (OpenTime >= StartSession – i*10000) OR (OpenTime < EndSession – i*10000) Then
  highLow[i,0] = Max(highLow[i,0], high)
  highLow[i,1] = Min(highLow[i,1], low)
  Bar2 = BarIndex
  Endif
  Next

  // Loop through last 10 sessions and draw segments
  For i = 0 To 9
  DrawSegment(Bar1-i,highLow[i,0],Bar2-i,highLow[i,0]) Coloured(“Blue”,255)
  DrawSegment(Bar1-i,highLow[i,1],Bar2-i,highLow[i,1]) Coloured(“Red”,255)
  Next

  RETURN

  

  anilkc

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  03/27/2023 at 6:23 PM #212250
  robertogozzi

  You can replace the two lines that draw the segments, with DrawRectangle:

  //DrawSegment(Bar1,HH,Bar2,HH) coloured("Blue",255) //DrawSegment(Bar1,LL,Bar2,LL) coloured("Red",255) DrawRectangle(Bar1,HH,Bar2,LL) coloured("Blue",25) BorderColor("Red",255) style(line,2)

  1 2 3

  //DrawSegment(Bar1,HH,Bar2,HH) coloured("Blue",255) //DrawSegment(Bar1,LL,Bar2,LL) coloured("Red",255) DrawRectangle(Bar1,HH,Bar2,LL) coloured("Blue",25) BorderColor("Red",255) style(line,2)

  the line tickness can range 1 to 5. The transparency, aka Alpha, ranges from 0 (invisible) to 255 (maximum visibility).

  Array: highLow[10,2](0)  is not the way arrays are defined in ProRealTime. Additionally, they can only have one dimension. i.e. $myArray[n], not $myArray[n,m,…], and cannot be used with graphic instructions, so you first have to assign any single element you want to plot to a variable and use that variable with graphic instructions.

  To learn about arrays read https://www.prorealcode.com/topic/array-variables-availability-in-prorealtime/.

  If you need to use N elements, whenever you need to add a new element you first will have to shift all elements one place leftwards (move elements 2 to N to positions 1 to N-1) so that you lose the oldest element to make room to the newer one. This is valid if you use a fixed number of elements only (such as 10); if you don’t plan any limit, just append elements to the array.

   

   

   

   

   

  

  robertogozzi

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