Perfect Renko Chart - Amibroker AFL Code

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procedure constructChart_proc(nBar)
{
 global lBeginTime;
 global lEndTime;
 global lBeginNoTime;
 global lEndNoTime;
 global j;

 lBeginTime[ 0 ] = C[ 0 ];
 lEndTime[ 0 ] = C[ 0 ];
 lBeginNoTime[ 0 ] = C[ 0 ];
 lEndNoTime[ 0 ] = C[ 0 ]; 
 lastHigh = C[ 0 ];
 lastLow = C[ 0 ];
 numUp = 0;
 numDn = 0;
 j = 0;

 for ( i = 1; i < BarCount; i++ )
 {
  // 1) trend change up
  if ( C[ i ] > lastHigh AND numDn >= nBar AND numUp == 0)
  {
   numDn = 0;
   numUp = numUp + 1;
   j = j + 1;

   lBeginTime[ i ] = lBeginTime[ i - 1];
   lEndTime[ i ] = C[ i ];
   
   lBeginNoTime[ j ] = lBeginNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];  

   lastLow = lEndNoTime[ j - 1 ];
   lastHigh = C[ i ];
  }
  // 2) trend up continuation after downbar
  else if ( C[ i ] > lastHigh AND numDn > 0 AND numDn < nBar AND numUp == 0)
  {
   numDn = 0;
   numUp = numUp + 1;
   j = j + 1;

   lBeginTime[ i ] = lBeginTime[ i - 1];
   lEndTime[ i ] = C[ i ];
   
   lBeginNoTime[ j ] = lBeginNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];  

   lastLow = lEndNoTime[ j - 1 ];
   lastHigh = C[ i ];   
  }  
  // 3) trend up continuation
  else if ( C[ i ] > lastHigh AND numDn == 0 )
  {
   numDn = 0;
   numUp = numUp + 1;
   j = j + 1;
   
   lBeginTime[ i ] = lEndTime[ i - 1];
   lEndTime[ i ] = C[ i ];
   
   lBeginNoTime[ j ] = lEndNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];  
     
   if (numUp >= nbar)
   {
    lastLow = lEndNoTime[ j - nBar ];
   }
   else if (numUp < nBar)
   {
    lastLow = lastLow;
   }
   lastHigh = C[ i ];
  } 
   // 1) trend change down
  else if ( C[ i ] < lastLow AND numUp >= nBar AND numDn == 0)
  {
   numUp = 0;
   numDn = numDn + 1;
   j = j + 1;

   lBeginTime[ i ] = lBeginTime[ i - 1];
   lEndTime[ i ] = C[ i ];
   
   lBeginNoTime[ j ] = lBeginNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];  

   lastLow = C[ i ];
   lastHigh = lEndNoTime[ j - 1 ];      
  } 
  // 2) trend down continuation after upbar
  else if ( C[ i ] < lastLow AND numUp > 0 AND numUp < nBar AND numDn == 0)
  {
   numUp = 0;
   numDn = numDn + 1;
   j = j + 1;

   lBeginTime[ i ] = lBeginTime[ i - 1];
   lEndTime[ i ] = C[ i ];

   lBeginNoTime[ j ] = lBeginNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];  

   lastLow = C[ i ];
   lastHigh = lEndNoTime[ j - 1 ];     
  } 
  // 3) trend down continuation
  else if ( C[ i ] < lastLow AND numUp == 0 )
  {
   numUp = 0;
   numDn = numDn + 1;
   j = j + 1;
   
   lBeginTime[ i ] = lEndTime[ i - 1];
   lEndTime[ i ] = C[ i ];
   
   lBeginNoTime[ j ] = lEndNoTime[ j - 1];
   lEndNoTime[ j ] = C[ i ];     
   
   if (numDn >= nbar)
   {
    lastHigh = lEndNoTime[ j - nBar ];
   }
   else if (numDn < nBar)
   {
    lastHigh = lastHigh;
   }
   lastLow = C[ i ];
  } 
  // no break
  else if ( C[ i ] >= lastLow AND C[ i ] <= lastHigh )
  {
   lBeginTime[ i ] = lBeginTime[ i - 1];
   lEndTime[ i ] = lEndTime[ i - 1 ];
  } 
 }
}

// code by E.M.Pottasch, 11/7/2010, N line Break Charts
// After Steve Nison's book: Beyond Candlesticks, Chapter 6: three line break charts
// Option 1: turn time axis on/off, Option 2: N-line break instead of 3-line break
SetBarsRequired( sbrAll, sbrAll );

nBar = Param( "nBar", 3, 2, 10, 1 );
constructChart_proc(nBar);

Title = Name() + 
" |  " + EncodeColor( colorYellow ) + nbar + EncodeColor( colorWhite ) + " Line Break";

chartType = ParamToggle("Show Time Axis","show|hide",0);
if (chartType)
{
 GraphXSpace = 5;
 SetChartOptions( 0, chartShowDates );
 Plot(C, "\nTLB", colorWhite, styleBar);
 C = lEndTime;
 O = lBeginTime;
 H = IIf( C > O, C, O );
 L = IIf( C > O, O, C );
 Plot(C,"", colorWhite, styleCandle);
} 
else
{
 delta = BarCount - 1 - j;
 lBeginNoTime = Ref(lBeginNoTime,-delta);
 lEndNoTime = Ref(lEndNoTime,-delta);
 C = lEndNoTime;
 O = lBeginNoTime;
 H = IIf( C > O, C, O );
 L = IIf( C > O, O, C );
 Plot(C,"\nTLB", colorWhite, styleCandle);
}