# Plot Premarket Open Trendline / Range

##### New member
Looking for the correct TOS code to plot a trendline for the opening price based on premarket data (candle) starting at 4AM EST (0400). I have some code to plot the line, but Im having trouble with just plotting it for the current day only (not any prior days). I know my code is probably all messed up.. but it gives an idea.

Code:
``````input openingPMTime  = 0400.0; #hint OrMeanS: Begin Mean Period. Usually Market Open EST.
input openingTime  = 0930.0; #hint OrMeanS: Begin Mean Period. Usually Market Open EST.

def isDaily = If (GetAggregationPeriod() == AggregationPeriod.DAY, yes, no);
def isToday = If (GetDay() == GetLastDay() and SecondsFromTime(openingPMTime) >= 0, yes, no);
def isPreMarket = If (GetDay() == GetLastDay() and SecondsTillTime(openingPMTime) < 0, yes, no);

input pricePMOpen = open;

rec time_value = if(SecondsTillTime(openingPMTime) == 0, pricePMOpen, time_value[1]);

plot plotPMOpenLine = if(time_value == 0 and isToday, double.nan, time_value);
plotPMOpenLine.SetDefaultColor(color.yellow);``````

Any assistance would be greatly appreciated. Thank You!! @BenTen

An answer from The Universe of ThinkScript in Tutorial Section...

@nicktrader Try to work with this - Full script to work with at bottom.

Code:
``````15:01 Mobius©: Time Bracket: Objective, get first bar of RTH

def FirstBar = if SecondsFromTime(0930) == 0 and
SecondsTillTime(0930) == 0
then get barNumber()
else FirstBar[1];

15:10 Krafty: Mobius - I can understand how that code would work on a chart, where the code is called repeatedly, but I still don't understand how something like barNumber() would work in a scan that only calls it once. Would I put that in a script and use parameters for the brackets?

15:13 Mobius©: Krafty - a scan is a one pass event but the bar numbers are still there. The limitations are different in the scanner. As long as you don't try to go to far back it works exactly like the charts do. If you make it a dynamic scan it updates about every 3 minutes

Example below:

[ATTACH=full]4903[/ATTACH]

def na = double.nan;
def condition = if SecondsFromTime(0930) == 0 && SecondsTillTime(0930) == 0
then barNumber()
else na;
def StartBar = condition;
def StartBarOpen =  if barNumber() == StartBar
then open
else StartBarOpen[1];
def timecondition = if !isnan(startBarOpen)
then startbarOpen
else na;

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Or use this from the Universe of ThinkScript:

Code:
``````AddVerticalLine(SecondsTillTime(1130) == 0,
"Lunch",
Color.Cyan,
Curve.Short_Dash);``````

Ok thank you, @markos Ill gave it a try. i must have missed something from your first post. I can see the chart bubble, but not sure how to make it so there is a plot (or trendline) that displays on the chart from the opening premarket price and only visible on "today's" timeframe. I've done this for other S&R lines where it displays previous day's H&L and only displays for today and any time frame below Daily. However, Im having such a hard time with getting this to work with premarket data and the entire "time" functions within TOS.

@nicktrader There is a veritable boat load of scripts and examples in the Tutorial Section: Universe of Thinkscript. You could spend a week there and not read it all! JohnnyQuotron is the curator of that huge reference. Come back if you're stuck after a while, someone will direct you further.
Be sure you have code to post so we can see what you're looking at.

@nicktrader Modified from a different study finding an open. Not sure it works and not tested but maybe you can work it into your study. If lucky it will work.

def day = GetDay();

def PMopenBar = day != day[1];

def PMOpen = if PMopenBar then open else PMOpen[1];

plot PMO = PMOpen ;

PMO.SetDefaultColor (CreateColor (234, 136, 255));

Thank you both very much, @horserider , @markos !! I got it working, below is the full code with all the variables I used. Thanks again for all your help.

Code:
``````input LineWidth = 1;
def na = Double.NaN;
def isDaily = If (GetAggregationPeriod() == AggregationPeriod.DAY, yes, no);
def isBelowDaily = If (GetAggregationPeriod() < AggregationPeriod.DAY, yes, no);
def isToday = If (GetDay() == GetLastDay() and SecondsFromTime(openingPMTime) >= 0, yes, no);
def day = GetDay();

def PMopenBar = day != day[1];
def PMOpen = if PMopenBar then open else PMOpen[1];

plot PlotPMOLine = if isToday and isBelowDaily then PMOpen else na;
PlotPMOLine.SetDefaultColor(CreateColor(77, 166, 255));
PlotPMOLine.SetLineWeight(LineWidth);
PlotPMOLine.SetPaintingStrategy(PaintingStrategy.DASHES);
PlotPMOLine.HideTitle();
PlotPMOLine.HideBubble();``````

As @horserider asked, please share a picture of how it looks. We all benefit and learn when we see the end result!
You had it practically done. Great job filling in the missing pieces.

Both of you, please feel free to jump in and answer a few questions as you see them, your help would be appreciated.

I use it for the sentiment on the trade along with my other indicators. the opening price in premarket is a very interesting level when you have it plotted. thank you all.

please send the share of your code and a full picture of your chart so we can see how it is used.
Also, to keep track of code "ownership", try to get in the habit of putting the following in your scripts:
# Mobius
# Chat Room Request 04.26.2016 or uTS Request or whatever.
# v 7-19 just to keep track of what, who, and when. BTW, put this symbol on your chart and it will keep track of the A/D for the day.

def Data = close(symbol = "\$ADSPD", period = AggregationPeriod.Day);
then color.red
else color.green);
# End Code

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@markos This should be the full code. I believe a few lines were left off what nicktrader copied as the working study.

Code:
``````input openingPMTime  = 0400.0; #hint OrMeanS: Begin Mean Period. Usually Market Open EST.
input openingTime  = 0930.0; #hint OrMeanS: Begin Mean Period. Usually Market Open EST.

def isDaily = If (GetAggregationPeriod() == AggregationPeriod.DAY, yes, no);

def isPreMarket = If (GetDay() == GetLastDay() and SecondsTillTime(openingPMTime) < 0, yes, no);
input LineWidth = 1;
def na = Double.NaN;

def isBelowDaily = If (GetAggregationPeriod() < AggregationPeriod.DAY, yes, no);
def isToday = If (GetDay() == GetLastDay() and SecondsFromTime(openingPMTime) >= 0, yes, no);
def day = GetDay();

def PMopenBar = day != day[1];
def PMOpen = if PMopenBar then open else PMOpen[1];

plot PlotPMOLine = if isToday and isBelowDaily then PMOpen else na;
PlotPMOLine.SetDefaultColor(CreateColor(77, 166, 255));
PlotPMOLine.SetLineWeight(LineWidth);
PlotPMOLine.SetPaintingStrategy(PaintingStrategy.DASHES);
PlotPMOLine.HideTitle();
PlotPMOLine.HideBubble();``````

Ok no problem, @markos Updated code is below: (sorry I typed it all up and never posted, my bad!);

# Plot Premarket Open price on your TOS chart
# Plot will only show for the current day and will only be displayed on timeframe < Daily
#
# Date: 2019.07.19
#
#

input LineWidth = 1;
input openingPMTime = 0400.0; #Begin Premarket Opening Period. EST.
input openingTime = 0930.0; #Begin Regular market Opening Period. EST.

def na = Double.NaN;
def day = GetDay();
def isDaily = If (GetAggregationPeriod() == AggregationPeriod.DAY, yes, no);
def isBelowDaily = If (GetAggregationPeriod() < AggregationPeriod.DAY, yes, no);
def isToday = If (day == GetLastDay() and SecondsFromTime(openingPMTime) >= 0, yes, no);

def PMopenBar = day != day[1];
def PMOpen = if PMopenBar then open else PMOpen[1];

plot PlotPMOLine = if isToday and isBelowDaily then PMOpen else na;
PlotPMOLine.SetDefaultColor(CreateColor(77, 166, 255));
PlotPMOLine.SetLineWeight(LineWidth);
PlotPMOLine.SetPaintingStrategy(PaintingStrategy.DASHES);
PlotPMOLine.HideTitle();
PlotPMOLine.HideBubble();

# End Code

Ok no problem, @markos Updated code is below: (sorry I typed it all up and never posted, my bad!);

# Plot Premarket Open price on your TOS chart
# Plot will only show for the current day and will only be displayed on timeframe < Daily
#
# Date: 2019.07.19
#

# End Code
@nicktrader Thank you for following up, I appreciate that. Also, thanks for putting a proper header in. Now we all know were it originated from when it gets spread on the net,
If you don't oppose, Put created by vs Owner or just name and where you created/shared it. #Nick Trade in uTS or TSL, etc.

Hmmm Seems it would not be created without the code help

Sorry no problem. here is the updated code with the reference and both creators listed.

# Plot Premarket Open price on your TOS chart
# Plot will only show for the current day and will only be displayed on timeframe < Daily
#
# Created by: NickTrader & HorseRider via uTS
# Date: 2019.07.19
#
#

input LineWidth = 1;
input openingPMTime = 0400.0; #Begin Premarket Opening Period. EST.
input openingTime = 0930.0; #Begin Regular market Opening Period. EST.

def na = Double.NaN;
def day = GetDay();
def isDaily = If (GetAggregationPeriod() == AggregationPeriod.DAY, yes, no);
def isBelowDaily = If (GetAggregationPeriod() < AggregationPeriod.DAY, yes, no);
def isToday = If (day == GetLastDay() and SecondsFromTime(openingPMTime) >= 0, yes, no);

def PMopenBar = day != day[1];
def PMOpen = if PMopenBar then open else PMOpen[1];

plot PlotPMOLine = if isToday and isBelowDaily then PMOpen else na;
PlotPMOLine.SetDefaultColor(CreateColor(77, 166, 255));
PlotPMOLine.SetLineWeight(LineWidth);
PlotPMOLine.SetPaintingStrategy(PaintingStrategy.DASHES);
PlotPMOLine.HideTitle();
PlotPMOLine.HideBubble();

# End Code

@nicktrader hahaha Thanks. My evil sense of humor gets the best of me at times after what markos posted. Hope it will help with your trading. I am guessing a move above or below premarket open may give a hint to how the stock will move that day. Is that the idea?

lol @horserider . no worries buddy. I appreciate the assistance with the script. I hope it will help too. TC2000 posts this automatically in the software and I was looking to start using TOS as the cost of the platform and data fees are just a bit too much for me to renew. TOS is good, but its such a system hog. And yes, that is the idea with the line plot. it can be used to set sentiment or bias. thx again for your help and I may ping you in the near future as I have a few more "ideas" im working on.

@markos @nicktrader Lets play at making money. nicktrader Glad to assist with any ideas when I can. You can adjust the amount of memory allocated to ToS at log in screen. Also had big trouble of ToS messing with my old computer (AMD Athlon2 or such) until I changed quote times to "Slow max delay 10 sec" . Not a problem since. Setup, Application settings, System is where it hides.

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