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MT4智能交易编程示例 RSI指标
- #property copyright "路路发智能交易研发中心"
- #property link "http://www.ea668.com"
- #property description "Relative Strength Index"
- #property strict
- #property indicator_separate_window
- #property indicator_minimum 0
- #property indicator_maximum 100
- #property indicator_buffers 1
- #property indicator_color1 DodgerBlue
- #property indicator_level1 30.0
- #property indicator_level2 70.0
- #property indicator_levelcolor clrSilver
- #property indicator_levelstyle STYLE_DOT
- //--- input parameters
- input int InpRSIPeriod=14; // RSI Period
- //--- buffers
- double ExtRSIBuffer[];
- double ExtPosBuffer[];
- double ExtNegBuffer[];
- //+------------------------------------------------------------------+
- //| Custom indicator initialization function |
- //+------------------------------------------------------------------+
- int OnInit(void)
- {
- string short_name;
- //--- 2 additional buffers are used for counting.
- IndicatorBuffers(3);
- SetIndexBuffer(0,ExtRSIBuffer);
- SetIndexBuffer(1,ExtPosBuffer);
- SetIndexBuffer(2,ExtNegBuffer);
- //--- indicator line
- SetIndexStyle(0,DRAW_LINE);
- SetIndexBuffer(0,ExtRSIBuffer);
- //--- name for DataWindow and indicator subwindow label
- short_name="RSI("+string(InpRSIPeriod)+")";
- IndicatorShortName(short_name);
- SetIndexLabel(0,short_name);
- //--- check for input
- if(InpRSIPeriod<2)
- {
- Print("Incorrect value for input variable InpRSIPeriod = ",InpRSIPeriod);
- return(INIT_FAILED);
- }
- //---
- SetIndexDrawBegin(0,InpRSIPeriod);
- //--- initialization done
- return(INIT_SUCCEEDED);
- }
- //+------------------------------------------------------------------+
- //| Relative Strength Index |
- //+------------------------------------------------------------------+
- 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,pos;
- double diff;
- //---
- if(Bars<=InpRSIPeriod || InpRSIPeriod<2)
- return(0);
- //--- counting from 0 to rates_total
- ArraySetAsSeries(ExtRSIBuffer,false);
- ArraySetAsSeries(ExtPosBuffer,false);
- ArraySetAsSeries(ExtNegBuffer,false);
- ArraySetAsSeries(close,false);
- //--- preliminary calculations
- pos=prev_calculated-1;
- if(pos<=InpRSIPeriod)
- {
- //--- first RSIPeriod values of the indicator are not calculated
- ExtRSIBuffer[0]=0.0;
- ExtPosBuffer[0]=0.0;
- ExtNegBuffer[0]=0.0;
- double sump=0.0;
- double sumn=0.0;
- for(i=1; i<=InpRSIPeriod; i++)
- {
- ExtRSIBuffer[i]=0.0;
- ExtPosBuffer[i]=0.0;
- ExtNegBuffer[i]=0.0;
- diff=close[i]-close[i-1];
- if(diff>0)
- sump+=diff;
- else
- sumn-=diff;
- }
- //--- calculate first visible value
- ExtPosBuffer[InpRSIPeriod]=sump/InpRSIPeriod;
- ExtNegBuffer[InpRSIPeriod]=sumn/InpRSIPeriod;
- if(ExtNegBuffer[InpRSIPeriod]!=0.0)
- ExtRSIBuffer[InpRSIPeriod]=100.0-(100.0/(1.0+ExtPosBuffer[InpRSIPeriod]/ExtNegBuffer[InpRSIPeriod]));
- else
- {
- if(ExtPosBuffer[InpRSIPeriod]!=0.0)
- ExtRSIBuffer[InpRSIPeriod]=100.0;
- else
- ExtRSIBuffer[InpRSIPeriod]=50.0;
- }
- //--- prepare the position value for main calculation
- pos=InpRSIPeriod+1;
- }
- //--- the main loop of calculations
- for(i=pos; i<rates_total && !IsStopped(); i++)
- {
- diff=close[i]-close[i-1];
- ExtPosBuffer[i]=(ExtPosBuffer[i-1]*(InpRSIPeriod-1)+(diff>0.0?diff:0.0))/InpRSIPeriod;
- ExtNegBuffer[i]=(ExtNegBuffer[i-1]*(InpRSIPeriod-1)+(diff<0.0?-diff:0.0))/InpRSIPeriod;
- if(ExtNegBuffer[i]!=0.0)
- ExtRSIBuffer[i]=100.0-100.0/(1+ExtPosBuffer[i]/ExtNegBuffer[i]);
- else
- {
- if(ExtPosBuffer[i]!=0.0)
- ExtRSIBuffer[i]=100.0;
- else
- ExtRSIBuffer[i]=50.0;
- }
- }
- //---
- return(rates_total);
- }
- //+------------------------------------------------------------------+
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