Change Plot Color; Newbie Alert

[Mabba]

Hey all, brand new here. So I have been searching and I feel close but can't quite get there. Overall idea:

A sub-panel with each bar producing a dot of a constant value. I want to change the color of that dot based off of a different indicator. In this case, I want the dot to be green if the slope of the EMA is positive and red if the slope is negative, black if it is neutral (if ever).

Right now I have two EMAs that I am trying to calculate and two dot plots.

Any help or links to material or other threads in the right direction would be appreciated. Thanks in advance!

protected override void Initialize()
{
Add(new Plot(Color.FromKnownColor(KnownColor.LawnGreen), PlotStyle.Dot, "EMA9"));
Add(new Plot(Color.FromKnownColor(KnownColor.Red), PlotStyle.Dot, "EMA8"));
Add(new Line(Color.FromKnownColor(KnownColor.White), 4, "Divider"));

CalculateOnBarClose = true;
Overlay = false;
}

/// <summary>
/// Called on each bar update event (incoming tick)
/// </summary>
protected override void OnBarUpdate()
{
// Use this method for calculating your indicator values. Assign a value to each
// plot below by replacing 'Close[0]' with your own formula.
EMA9.Set(9);
EMA8.Set(8);

// define each EMA period
double slope9 = (EMA(Ema9p)[0]- EMA(Ema9p)[1]);
double slope8 = (EMA(Ema8p)[0]- EMA(Ema8p)[1]);


// If the slope is rising turn plot green, if falling turn red, if neutral leave black
if ( slope9 > 0 )
Plots[0].Pen = new Pen(Color.LimeGreen);
else if ( slope9 < 0 )
Plots[0].Pen = new Pen(Color.Red);
else
Plots[0].Pen = new Pen(Color.Black);

if ( slope8 > 0 )
Plots[1].Pen = new Pen(Color.LimeGreen);
else if ( slope8 < 0 )
Plots[1].Pen = new Pen(Color.Red);
else
Plots[1].Pen = new Pen(Color.Black);

}

[NinjaTrader_ChrisL]

Hello Mabba,

Thanks for the post, and welcome to the NinjaTrader forum.

The first thing I notice is the use of EMA9.Set(9); and EMA8.Set(8), which does not compile. If you need to set up an EMA as a class object, define it at the class level, then set it up at the beginning bar in OnBarUpdate. What you likely wanted to do is set a value for a custom series. The "bare bones" way of setting values is to use the Values[][] array. This array holds all plot values to be plotted on the chart. For the attached example, I set the Values to the EMA values.

Changing the plot pen will change all values of the plot. You will want to use the PlotColors[][] array.

https://ninjatrader.com/support/helpGuides/nt7/?plotcolors.htm

I have attached a modification of the code that you posted for your reference. Place the attached file within ..\Documents\NinjaTrader 7\bin\Custom\Indicator, compile, and then load it onto a chart if you wish to see the output.

Please let us know if we may be of any further assistance.

[Mabba]

Thanks for the quick reply Chris, I will give it a go!

[Mabba]

I think I got it, I just changed the last line in the 'testscript' that you sent back to:

Values[0][0] = 9;
Values[1][0] = 8;

Thanks, I will keep tinkering!