Is it possible to limit drawing to a number of bars?

[Bob-Habanai]

Here's a basic indicator I wrote with help from the kind moderators here.

It draws volume above and below bars on the chart. It was basically an experiment in learning Ninjascript.

What I would like to know is it possible to limit how far back the indicator draws draws bars?

I have another indicator which requires loading lots of days of data, but I'm working on a new indicator which I would only like to draw the last 10 bars.

Is that possible?


The code:

        //create a class-level variable called myVolume
        private double myVolume;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                                    = @"Enter the description for your new custom Indicator here.";
                Name                                        = "VolumeAboveAndBelow";
                Calculate                                    = Calculate.OnEachTick;
                IsOverlay                                    = true;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = true;
                DrawHorizontalGridLines                        = true;
                DrawVerticalGridLines                        = true;
                PaintPriceMarkers                            = true;
                ScaleJustification                            = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                //Disable this property if your indicator requires custom values that cumulate with each new market data event.
                //See Help Guide for additional information.
                IsSuspendedWhileInactive                    = true;
            }
            else if (State == State.Configure)
            {
            }
        }

        protected override void OnBarUpdate()
        {
            //assign the VOL[0] indicator value to the double variable
            myVolume = VOL()[0];

            //check for up bar and use Draw.Text() to draw variable value on chart
            if (Close[0] > Open[0])
                Draw.Text(this, "vol up bar" + CurrentBar, myVolume.ToString(), 0, High[0] + 5 * TickSize, Brushes.Red);

            //check for download bar and use Draw.Text() to draw variable value on chart
            if (Open[0] >= Close[0])
                Draw.Text(this, "vol up bar" + CurrentBar, myVolume.ToString(), 0, Low[0] - 5 * TickSize, Brushes.ForestGreen);



        }
    }
}​

[eDanny]

If you only wanted the last 50 bars to have text you could use CurrentBar since you have it in your text draw objects.
if(CurrentBar > 50)
RemoveDrawObject("vol up bar" + (CurrentBar-50));

[NinjaTrader_ChelseaB]

Hello Bob-Habanai,

If you want to draw on the last 50 historical bars, check that the State is State.Historical as well.
https://ninjatrader.com/support/foru...61#post1210861
https://ninjatrader.com/support/helpGuides/nt8/currentbar.htm

[Bob-Habanai]

Thank you both for your replies!

[Bob-Habanai]

A follow-up question.

Is there a way to apply an if to all other sequential ifs?

like

if ((State == State.Historical && CurrentBar == Count -50))

then all other various if commands after with assuming the above if?

e.g.
if ((State == State.Historical && CurrentBar == Count -50))
then if (Close[0] > Open[0])
Draw.Text(this, "vol up bar" + CurrentBar, myVolume.ToString(), 0, High[0] + 5 * TickSize, Brushes.Red);
then if (still assuming the first if, but not the second)(Open[0] >= Close[0])
Draw.Text(this, "vol up bar" + CurrentBar, myVolume.ToString(), 0, Low[0] - 5 * TickSize, Brushes.ForestGreen);

Thanks

[NinjaTrader_ChelseaB]

Hello Bob-Habanai,

This is done by nesting.

if (/*outer if must be true*/)
{
if (/* outer if must be true and inner if must also be true*/)
{
}

if (/* outer if must be true and second inner if must also be true, but not the first inner if*/)
{
}
}

[Bob-Habanai]

Thanks again!