I'm new to coding and want to learn enough C# to create or modify the indicators that I use. I have an ema slope indicator that i want to add specific parameters to but don't know how to go about writing the code. For example, If parameter setting 10 is met then I want the ema to plot green and stay green. if -10, then plot red. If in between 10 and -10 plot blue. Here is a copy of the existing code.

//This namespace holds Indicators in this folder and is required. Do not change it.
namespace NinjaTrader.NinjaScript.Indicators
{
public class EMASlopeColor : Indicator
{
protected override void OnStateChange()
{
if (State == State.SetDefaults)
{
Description = @"Exponential Moving Average. The Exponential Moving Average is an indicator that shows the average value of a security's price over a period of time. When calculating a moving average. The EMA_Slope_Color applies more weight to recent prices than the SMA. Colors based on IsRising or IsFalling";
Name = "EMASlopeColor";
Calculate = Calculate.OnBarClose;
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;
Period = 14;
UpColor = Brushes.LimeGreen;
DnColor = Brushes.Red;
ColorSlope = true;
AddPlot(Brushes.Orange, "EMA_Slope_Color");
}

}

protected override void OnBarUpdate()
{
Value[0] = (CurrentBar == 0 ? Input[0] : Input[0] * (2.0 / (1 + Period)) + (1 - (2.0 / (1 + Period))) * Value[1]);


if(IsRising(Value))
{
if(ColorSlope)
PlotBrushes[0][0] = UpColor;
}
if(IsFalling(Value))
{
if(ColorSlope)
PlotBrushes[0][0] = DnColor;
}
}

Because the charts are dynamic, slopes are relative to the chart and are not static as in real life.

There are many threads about this on Futures.io I suggest you search for them in the search box to the upper right of the screen.

Here is one to get you started but I think you will find slope is not very valuable in the long run.

Coloring an IndicatorLine by Slope: Questions for Optimal Coding "Slope" does not exist on scalable charts. The concept "Slope" refers to print outs and was used 50 years ago when charts were printed and neither the time scale nor the price scale were ever changed. Slope is just a visualization of …