How do I code an existing indicator, RSI, so that the line changes color based on whether it is positive or negative?

I copied the code but didn't know where to paste it into the editor. After some research, I'm thinking I would use the Brush to have the color change but have no idea.

Ninjascript seems way too much. For reference, I'm able to make changes in thinkorswim which seems way easier but I'm not using TOS for futures...

Gaterz 

How do I code an existing indicator, RSI, so that the line changes color based on whether it is positive or negative? I copied the code but didn't know where to paste it into the editor. After some research, I'm thinking I would use the Brush to have the color change but have no idea. Ninjascript seems way too much. For reference, I'm able to make changes in thinkorswim which seems way easier but I'm not using TOS for futures...

I would use the slope and place it in the OnBarUpdate method:
https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?slope.htm

If angle > x then change the color to x else change the color to y

Gaterz 

How do I code an existing indicator, RSI, so that the line changes color based on whether it is positive or negative? I copied the code but didn't know where to paste it into the editor. After some research, I'm thinking I would use the Brush to have the color change but have no idea. Ninjascript seems way too much. For reference, I'm able to make changes in thinkorswim which seems way easier but I'm not using TOS for futures...

The values plotted are always positive, so consider using a combination of IsRising() and IsFaling().

Drag the attached file into the Indicators folder and compile. Or simply add the sample code highligted in red below:

 

Code

double avgDown0 = avgDown[0]; double value0 = avgDown0 == 0 ? 100 : 100 - 100 / (1 + avgUp[0] / avgDown0); Default[0] = value0; Avg[0] = constant1 * value0 + constant2 * Avg[1]; //------------------------------------------- if (IsRising(Default)) PlotBrushes[0][0] = Brushes.Green; else PlotBrushes[0][0] = Brushes.Red; if (IsRising(Avg)) PlotBrushes[1][0] = Brushes.Lime; else PlotBrushes[1][0] = Brushes.Pink; //----------------- }