(8)外汇MT4编程：自动画趋势线指标

外汇MT4编程：

自动画趋势线指标

源代码如下：

//+------------------------------------------------------------------+
//|                                                        qsx-2.mq4 |
//|                        Copyright 2012, MetaQuotes Software Corp. |
//|                                        http://www. |
//+------------------------------------------------------------------+
#property copyright "Copyright 2012, MetaQuotes Software Corp."
#property link      "http://www."

#property indicator_chart_window
extern int Hours=24;
extern color col=SkyBlue;

double lr,lr0,lrp;
double sx,sy,sxy,sx2,aa,bb;

int p,fs;
int f,f0,f1;
double dh,dl,dh_1,dl_1,dh_2,dl_2;
int ai_1,ai_2,bi_1,bi_2;

double hai,lai,dhi,dli,dhm,dlm,ha0,hap,la0,lap;
double price_p1,price_p0,price_p2,price_01,price_00,price_02;
int p1,p0,p2,fp;
string sName="ang_autoch_hl";
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
 int init()
   {
 
 return(0);
  }

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
   ObjectDelete("1"+sName);
   ObjectDelete("0"+sName);
   ObjectDelete("2"+sName);
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
    int counted_bars=IndicatorCounted();   
      if (f==1)
        {
          p1=iBarShift(Symbol(),Period(),ObjectGet("1"+sName,OBJPROP_TIME1));
          p0=iBarShift(Symbol(),Period(),ObjectGet("0"+sName,OBJPROP_TIME1));
          p2=iBarShift(Symbol(),Period(),ObjectGet("2"+sName,OBJPROP_TIME1));
          if (fp==0 && p!=p1)
            {
            p=p1;
            fp=1;
            }
          if (fp==0 && p!=p0)
           {
             p=p0;
             fp=1;
           }
          if (fp==0 && p!=p2)
           {
            p=p2;
            fp=1;
           }
        }

       sx=0; sy=0; sxy=0; sx2=0;
       for (int n=0; n<=p; n++)
         {
           sx+=n;
           sy+=Close[n];
           sxy+=n*Close[n];
           sx2+=MathPow(n,2);
         } 
       aa=(sx*sy-(p+1)*sxy)/(MathPow(sx,2)-(p+1)*sx2); bb=(sy-aa*sx)/(p+1);

       for (int i=0; i<=p; i++)
        {
         lr=bb+aa*i;
         dh=High[i]-lr;
         dl=Low[i]-lr;

         if (i<p/2) {if (i==0)
           {dh_1=0.0;
            dl_1=0.0;
            ai_1=i;
            bi_1=i;
           }
         if (dh>=dh_1)
          {
           dh_1=dh; ai_1=i;
          }
         if (dl<=dl_1)
           {
             dl_1=dl;
             bi_1=i;
           }
        }

      if (i>=p/2)
       {
         if (i==p/2)
           {
             dh_2=0.0;
             dl_2=0.0;
             ai_2=i;
             bi_2=i;
            }
         if (dh>=dh_2)
           {
             dh_2=dh;
             ai_2=i;
           }
         if (dl<=dl_2)
           {
             dl_2=dl;
             bi_2=i;
           }
         }
       }

//-------------------------------------
lr0=bb; lrp=bb+aa*(i+p);
//===================================================
if (MathAbs(ai_1-ai_2)>MathAbs(bi_1-bi_2)) f=1;
if (MathAbs(ai_1-ai_2)<MathAbs(bi_1-bi_2)) f=2;
if (MathAbs(ai_1-ai_2)==MathAbs(bi_1-bi_2)) {if (MathAbs(dh_1-dh_2)<MathAbs(dl_1-dl_2)) f=1; if (MathAbs(dh_1-dh_2)>=MathAbs(dl_1-dl_2)) f=2;}
//=================================================
if (f==1) {
for (n=0; n<=20; n++) { f1=0;
for (i=0; i<=p; i++) {hai=High[ai_1]*(i-ai_2)/(ai_1-ai_2)+High[ai_2]*(i-ai_1)/(ai_2-ai_1);
if (i==0 || i==p/2) dhm=0.0;
if (High[i]-hai>dhm && i<p/2) {ai_1=i; f1=1;}
if (High[i]-hai>dhm && i>=p/2) {ai_2=i; f1=1;} }
if (f==0) break;}
//----------------------------
for (i=0; i<=p; i++) {hai=High[ai_1]*(i-ai_2)/(ai_1-ai_2)+High[ai_2]*(i-ai_1)/(ai_2-ai_1);
dli=Low[i]-hai;
if (i==0) dlm=0.0; if (dli<dlm) dlm=dli;} 
ha0=High[ai_1]*(0-ai_2)/(ai_1-ai_2)+High[ai_2]*(0-ai_1)/(ai_2-ai_1);
hap=High[ai_1]*(p-ai_2)/(ai_1-ai_2)+High[ai_2]*(p-ai_1)/(ai_2-ai_1);
//----------------------------
price_p1=hap;
price_p0=hap+dlm/2;
price_p2=hap+dlm;
price_01=ha0;
price_00=ha0+dlm/2;
price_02=ha0+dlm;
}
//=================================================
if (f==2) {
for (n=0; n<=20; n++) { f1=0;
for (i=0; i<=p; i++) {lai=Low[bi_1]*(i-bi_2)/(bi_1-bi_2)+Low[bi_2]*(i-bi_1)/(bi_2-bi_1);
if (i==0 || i==p/2) dlm=0.0;
if (Low[i]-lai<dlm && i<p/2) {bi_1=i; f1=1;}
if (Low[i]-lai<dlm && i>=p/2) {bi_2=i; f1=1;}}
if (f==0) break;}
//----------------------------
for (i=0; i<=p; i++) {lai=Low[bi_1]*(i-bi_2)/(bi_1-bi_2)+Low[bi_2]*(i-bi_1)/(bi_2-bi_1);
dhi=High[i]-lai;
if (i==0) dhm=0.0; if (dhi>dhm) dhm=dhi;} 
la0=Low[bi_1]*(0-bi_2)/(bi_1-bi_2)+Low[bi_2]*(0-bi_1)/(bi_2-bi_1);
lap=Low[bi_1]*(p-bi_2)/(bi_1-bi_2)+Low[bi_2]*(p-bi_1)/(bi_2-bi_1);
//----------------------------------------------------------------
price_p1=lap;
price_p0=lap+dhm/2;
price_p2=lap+dhm;
price_01=la0;
price_00=la0+dhm/2;
price_02=la0+dhm;
}

ObjectCreate("1"+sName,2, 0,Time[p],price_p1,Time[0],price_01);
ObjectCreate("0"+sName,2, 0,Time[p],price_p0,Time[0],price_00);
ObjectCreate("2"+sName,2, 0,Time[p],price_p2,Time[0],price_02);

ObjectSet("1"+sName,OBJPROP_COLOR,col);
ObjectSet("0"+sName,OBJPROP_COLOR,col);
ObjectSet("0"+sName,OBJPROP_STYLE,STYLE_DOT);
ObjectSet("2"+sName,OBJPROP_COLOR,col);
//---------------------------------------------
ObjectSet("1"+sName,OBJPROP_TIME1,Time[p]);
ObjectSet("1"+sName,OBJPROP_PRICE1,price_p1);
ObjectSet("1"+sName,OBJPROP_TIME2,Time[0]);
ObjectSet("1"+sName,OBJPROP_PRICE2,price_01);
ObjectSet("0"+sName,OBJPROP_TIME1,Time[p]);
ObjectSet("0"+sName,OBJPROP_PRICE1,price_p0);
ObjectSet("0"+sName,OBJPROP_TIME2,Time[0]);
ObjectSet("0"+sName,OBJPROP_PRICE2,price_00);
ObjectSet("2"+sName,OBJPROP_TIME1,Time[p]);
ObjectSet("2"+sName,OBJPROP_PRICE1,price_p2);
ObjectSet("2"+sName,OBJPROP_TIME2,Time[0]);
ObjectSet("2"+sName,OBJPROP_PRICE2,price_02);

f=1; p1=p; p0=p; p2=p; fp=0;

return(0);
}
//+------------------------------------------------------------------+