Least Squares Moving Average Color Coding

When I compare the MT4 Least Squares Moving Average to Tradestation's Linear Regression Curve, they are certainly the same formula. However, the MT4 indicator has some nice red/green/yellow color coding which I like a lot.
My Tradestation indicator is just one color. If you look at the MT4 Least Squares MA, the color coding logic is not simple up/down logic (ie, if MA >= MA[1] then green, if MA < MA[1] then red), it is something else. I like this particular indicator coloring and would like to apply it to the Tradestation Linear Regression Curve so I can use it on some non-forex markets I also trade. I am reasonably fluent in Tradestation indicator programming, but I cannot read MQL4 code at all. I'm sure I could program the color into the TS LRC indicator if I could understand the coloring logic in the MQL4 code.

So, my question is, what is the indicator color coding logic (in usual logic statements or sentences) contained in the following code?

Many Thanks, Scott

//+------------------------------------------------------------------+
//|                                                        |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property  copyright "Copyright © 2005, FX Sniper "
#property  link      "http://www.metaquotes.net/"
 
//---- indicator settings
#property  indicator_chart_window
#property  indicator_buffers 3
#property indicator_color1 Yellow      
#property indicator_color2 Green
#property indicator_color3 Red
 
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
int width;
 
extern int Rperiod = 34;
extern int Draw4HowLongg = 1500;
int Draw4HowLong;
int shift;
int i;
int loopbegin;
double sum[];
int length;
double lengthvar;
double tmp ;
double wt[];
int c;
 
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(5);
   
//---- drawing settings
   SetIndexBuffer(2,ExtMapBuffer1);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexBuffer(0,ExtMapBuffer3);
   SetIndexBuffer(3,sum);
   SetIndexBuffer(4,wt);
   
   SetIndexStyle(2,DRAW_LINE,STYLE_SOLID,2);
   SetIndexStyle(1,DRAW_LINE,STYLE_SOLID,2);
   SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,2);
 
//---- initialization done
   return(0);
  }
 
int start()
 
  {   Draw4HowLong = Bars-Rperiod - 5;
      length = Rperiod;
      loopbegin = Draw4HowLong - length - 1;
 
      for(shift = loopbegin; shift >= 0; shift--)
      { 
         sum[1] = 0;
         for(i = length; i >= 1  ; i--)
         {
         lengthvar = length + 1;
         lengthvar /= 3;
         tmp = 0;
         tmp = ( i - lengthvar)*Close[length-i+shift];
         sum[1]+=tmp;
         }
         wt[shift] = sum[1]*6/(length*(length+1));
         
//========== COLOR CODING ===========================================               
        
       ExtMapBuffer3[shift] = wt[shift]; //red 
       ExtMapBuffer2[shift] = wt[shift]; //green
       ExtMapBuffer1[shift] = wt[shift]; //yellow
       
       //  for(c=loopbegin;c==shift;c++)
       // {
        if (wt[shift+1] > wt[shift])
        {
        ExtMapBuffer2[shift+1] = EMPTY_VALUE;
  // ObjectCreate("smiley_face", OBJ_ARROW, 0, Time[shift], Low[shift]-Point*20);
  // Print("time=  ",Time[shift]);
  // ObjectSet("smiley_face", OBJPROP_ARROWCODE, 242);
  // ObjectSet("smiley_face", OBJPROP_COLOR , Red);
  // ObjectSet("smiley_face", OBJPROP_WIDTH  , 1);
  // ObjectsRedraw();
 
        //ExtMapBuffer3[shift+1] = EMPTY_VALUE;
        //ExtMapBuffer3[shift+1] = EMPTY_VALUE;
        
        }
       else if (wt[shift+1] < wt[shift]) 
        {
        ExtMapBuffer1[shift+1] = EMPTY_VALUE; //-1 red/greem tight
       //ExtMapBuffer3[shift+1] = EMPTY_VALUE;
        
        }
         else 
         {
         
         ExtMapBuffer1[shift+1]=CLR_NONE;//EMPTY_VALUE;
         ExtMapBuffer2[shift+1]=CLR_NONE;//EMPTY_VALUE;
         }
        
      }
    
      return(0);
  }
//+------------------------------------------------------------------+