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标题: 请大神解释Stochastic函数的每段源码意思 [打印本页]

作者: selimary 时间: 2018-1-11 11:55
标题: 请大神解释Stochastic函数的每段源码意思
新手，自己在写EA，MT4自带的技术指标，希望能在程序中引用该指标，但源码只有部分才能看懂，请各位前辈帮忙解释
//+------------------------------------------------------------------+
//|                                                 Stochastic.mq4 |
//|                Copyright 2005-2014, MetaQuotes Software Corp. |
//|                                           http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright "2005-2014, MetaQuotes Software Corp."
#property link       "http://www.mql4.com"
#property description "Stochastic Oscillator"
#property strict
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_buffers 2
#property indicator_color1    LightSeaGreen
#property indicator_color2    Red
#property indicator_level1    20.0
#property indicator_level2    80.0
#property indicator_levelcolor clrSilver
#property indicator_levelstyle STYLE_DOT
//--- input parameters
input int InpKPeriod=5; // K Period
input int InpDPeriod=3; // D Period
input int InpSlowing=3; // Slowing
//--- buffers
double ExtMainBuffer[];
double ExtSignalBuffer[];
double ExtHighesBuffer[];
double ExtLowesBuffer[];
//---
int draw_begin1=0;
int draw_begin2=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                      |
//+------------------------------------------------------------------+
int OnInit(void)
  {
string short_name;
//--- 2 additional buffers are used for counting.
IndicatorBuffers(4);
SetIndexBuffer(2, ExtHighesBuffer);
SetIndexBuffer(3, ExtLowesBuffer);
//--- indicator lines
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0, ExtMainBuffer);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1, ExtSignalBuffer);
//--- name for DataWindow and indicator subwindow label
short_name="Sto("+IntegerToString(InpKPeriod)+","+IntegerToString(InpDPeriod)+","+IntegerToString(InpSlowing)+")";
IndicatorShortName(short_name);
SetIndexLabel(0,short_name);
SetIndexLabel(1,"Signal");
//---
draw_begin1=InpKPeriod+InpSlowing;
draw_begin2=draw_begin1+InpDPeriod;
SetIndexDrawBegin(0,draw_begin1);
SetIndexDrawBegin(1,draw_begin2);
//--- initialization done
return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Stochastic oscillator                                           |
//+------------------------------------------------------------------+
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,k,pos;
//--- check for bars count
if(rates_totallow[k])
         dmin=low[k];
      if(dmax<high[k])
         dmax=high[k];
      }
   ExtLowesBuffer[i]=dmin;
   ExtHighesBuffer[i]=dmax;
   }
//--- %K line
pos=InpKPeriod-1+InpSlowing-1;
if(pos+1<prev_calculated)
   pos=prev_calculated-2;
else
   {
   for(i=0; i<pos; i++)
      ExtMainBuffer[i]=0.0;
   }
//--- main cycle
for(i=pos; i<rates_total && !IsStopped(); i++)
   {
   double sumlow=0.0;
   double sumhigh=0.0;
   for(k=(i-InpSlowing+1); k<=i; k++)
      {
      sumlow +=(close[k]-ExtLowesBuffer[k]);
      sumhigh+=(ExtHighesBuffer[k]-ExtLowesBuffer[k]);
      }
   if(sumhigh==0.0)
      ExtMainBuffer[i]=100.0;
   else
      ExtMainBuffer[i]=sumlow/sumhigh*100.0;
   }
//--- signal
pos=InpDPeriod-1;
if(pos+1<prev_calculated)
   pos=prev_calculated-2;
else
   {
   for(i=0; i<pos; i++)
      ExtSignalBuffer[i]=0.0;
   }
for(i=pos; i<rates_total && !IsStopped(); i++)
   {
   double sum=0.0;
   for(k=0; k<InpDPeriod; k++)
      sum+=ExtMainBuffer[i-k];
   ExtSignalBuffer[i]=sum/InpDPeriod;
   }
//--- OnCalculate done. Return new prev_calculated.
return(rates_total);
  }
//+------------------------------------------------------------------+

作者: 注册号 时间: 2018-1-11 12:51
帮顶贴

作者: @星辰大海 时间: 2018-1-11 14:31
路过帮顶

作者: cheng0ye 时间: 2018-1-11 15:31
没有人会帮你的，只能自己解决

作者: ddhaha 时间: 2018-1-11 16:01
这个东西，自己查书一点点抠！这么初级的东西，还不想努力？

作者: winfyha 时间: 2018-1-11 16:18
感謝分享

作者: 15806593088 时间: 2018-1-11 17:10
谢谢楼主分享！！！

作者: 福相随 时间: 2018-1-11 18:32
伸手习惯了，慢慢我的习气就变坏了

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