Step chart - rsi

ÿþ//+------------------------------------------------------------------

#property copyright   "mladen"

#property link        "mladenfx@gmail.com"

#property description "Step chart of RSI"

//+------------------------------------------------------------------

#property indicator_separate_window

#property indicator_buffers 4

#property indicator_plots   2

#property indicator_label1  "Step chart of rsi"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrDarkGray

#property indicator_style1  STYLE_DOT

#property indicator_label2  "Step chart"

#property indicator_type2   DRAW_COLOR_HISTOGRAM2

#property indicator_color2  clrDarkGray,clrDodgerBlue,clrSandyBrown

#property indicator_width2  2

//

//--- input parameters

//

input int                inpRsiPeriod = 14;         // RSI period

input ENUM_APPLIED_PRICE inpPrice    = PRICE_CLOSE; // Price

input double             inpStepSize = 5;           // Step size (in RSI %)

//

//--- buffers and global variables declarations

//

double barh[],barl[],barc[],val[];

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int OnInit()

  {

//--- indicator buffers mapping

   SetIndexBuffer(0,val,INDICATOR_DATA);

   SetIndexBuffer(1,barh,INDICATOR_DATA);

   SetIndexBuffer(2,barl,INDICATOR_DATA);

   SetIndexBuffer(3,barc,INDICATOR_COLOR_INDEX);

//---

   IndicatorSetString(INDICATOR_SHORTNAME,"Step chart of ("+(string)inpRsiPeriod+" RSI)");

   return (INIT_SUCCEEDED);

  }

//+------------------------------------------------------------------+

//| Custom indicator de-initialization function                      |

//+------------------------------------------------------------------+

void OnDeinit(const int reason)

  {

  }

//+------------------------------------------------------------------+

//| Custom indicator iteration function                              |

//+------------------------------------------------------------------+

int OnCalculate(const int rates_total,

                const int prev_calculated,

                const datetime &time[],

                const double &open[],

                const double &high[],

                const double &low[],

                const double &close[],

                const long &tick_volume[],

                const long &volume[],

                const int &spread[])

  {

   

   //

   //---

   //

   

   int i=(int)MathMax(prev_calculated-1,0); for(; i<rates_total && !_StopFlag; i++)

     {

      val[i] = iRsi(getPrice(inpPrice,open,close,high,low,i,rates_total),inpRsiPeriod,i,rates_total);

      double rbarh,rbarl,rtrend;

         iStepChart(val[i],inpStepSize,rbarh,rbarl,rtrend,i,rates_total);

            barh[i] = rbarh;

            barl[i] = (rbarh==rbarl) ? rbarh-1 : rbarl;

            barc[i] = (rtrend==1) ? 1 : 2;

     }

   return (i);

  }

//+------------------------------------------------------------------+

//| Custom functions                                                 |

//+------------------------------------------------------------------+

#define _rsiInstances 1

#define _rsiInstancesSize 3

double workRsi[][_rsiInstances*_rsiInstancesSize];

#define _price  0

#define _change 1

#define _changa 2

//

//---

//

double iRsi(double price,double period,int r,int bars,int instanceNo=0)

  {

   if(ArrayRange(workRsi,0)!=bars) ArrayResize(workRsi,bars);

   int z=instanceNo*_rsiInstancesSize;

//

//---

//

   workRsi[r][z+_price]=price;

   double alpha=1.0/MathMax(period,1);

   if(r<period)

     {

      int k; double sum=0; for(k=0; k<period && (r-k-1)>=0; k++) sum+=MathAbs(workRsi[r-k][z+_price]-workRsi[r-k-1][z+_price]);

      workRsi[r][z+_change] = (workRsi[r][z+_price]-workRsi[0][z+_price])/MathMax(k,1);

      workRsi[r][z+_changa] =                                         sum/MathMax(k,1);

     }

   else

     {

      double change=workRsi[r][z+_price]-workRsi[r-1][z+_price];

      workRsi[r][z+_change] = workRsi[r-1][z+_change] + alpha*(        change  - workRsi[r-1][z+_change]);

      workRsi[r][z+_changa] = workRsi[r-1][z+_changa] + alpha*(MathAbs(change) - workRsi[r-1][z+_changa]);

     }

   return(50.0*(workRsi[r][z+_change]/MathMax(workRsi[r][z+_changa],DBL_MIN)+1));

  }

//

//---

//

#define _stepChartInstances     1

#define _stepChartInstancesSize 2

double _stepChartWork[][_stepChartInstances*_stepChartInstancesSize];

#define _steps 0

#define _trend 1

//

//---

//

void iStepChart(double value, double stepSize, double& rbarh, double& rbarl, double& rtrend, int i, int bars, int instanceNo=0)

{

   if (ArrayRange(_stepChartWork,0)!=bars) ArrayResize(_stepChartWork,bars); instanceNo*=_stepChartInstancesSize;

   

   //

   //---

   //

   

   if (i==0)

   {

      _stepChartWork[i][instanceNo+_steps] = rbarh  = rbarl = (stepSize>0) ? MathRound(value/stepSize)*stepSize : value; 

      _stepChartWork[i][instanceNo+_trend] = rtrend = 0;

   }

   else

   {

      if (MathAbs(value-_stepChartWork[i-1][instanceNo+_steps]) < stepSize) _stepChartWork[i][instanceNo+_steps] = _stepChartWork[i-1][instanceNo+_steps]; 

      else

      { 

         _stepChartWork[i][instanceNo+_steps] = _stepChartWork[i-1][instanceNo+_steps];

            while(MathAbs(value - _stepChartWork[i][instanceNo+_steps]) > stepSize) 

            {

               if(value > _stepChartWork[i][instanceNo+_steps]) _stepChartWork[i][instanceNo+_steps] += stepSize;

               if(value < _stepChartWork[i][instanceNo+_steps]) _stepChartWork[i][instanceNo+_steps] -= stepSize;

            }

      }    

      _stepChartWork[i][instanceNo+_trend] = (_stepChartWork[i][instanceNo+_steps]>_stepChartWork[i-1][instanceNo+_steps]) ? 1 : (_stepChartWork[i][instanceNo+_steps]<_stepChartWork[i-1][instanceNo+_steps]) ? -1 : _stepChartWork[i-1][instanceNo+_trend];

         rbarh  = _stepChartWork[i  ][instanceNo+_steps];

         rbarl  = _stepChartWork[i-1][instanceNo+_steps];

         rtrend = _stepChartWork[i  ][instanceNo+_trend];

   }

}  

//

//---

//

double getPrice(ENUM_APPLIED_PRICE tprice,const double &open[],const double &close[],const double &high[],const double &low[],int i,int _bars)

  {

   switch(tprice)

     {

      case PRICE_CLOSE:     return(close[i]);

      case PRICE_OPEN:      return(open[i]);

      case PRICE_HIGH:      return(high[i]);

      case PRICE_LOW:       return(low[i]);

      case PRICE_MEDIAN:    return((high[i]+low[i])/2.0);

      case PRICE_TYPICAL:   return((high[i]+low[i]+close[i])/3.0);

      case PRICE_WEIGHTED:  return((high[i]+low[i]+close[i]+close[i])/4.0);

     }

   return(0);

  }

//+------------------------------------------------------------------+