SHI Channel11_v1

//+------------------------------------------------------------------+
//|                                                  SHI_Channel11.mq4 |
//|                                 Copyright © 2004, Shurka & Kevin |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, Shurka & Kevin"
#property link      ""

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1 Blue
#property indicator_color2 Green
#property indicator_color3 Red
#property indicator_color4 Red
double ExtMapBuffer1[];
double midBuffer1[];
double ABuffer1[];
double BBuffer1[];
//---- input parameters
extern int       AllBars=240;
extern int       BarsForFract=0;
int CurrentBar=0;
double Step=0;
int B1=-1,B2=-1;
int UpDown=0;
double P1=0,P2=0,PP=0;
int i=0,AB=300,BFF=0;
int ishift=0;
double iprice=0;
datetime T1,T2;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexArrow(0,164);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexEmptyValue(0,0.0);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,midBuffer1);
   SetIndexEmptyValue(1,0.0);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,ABuffer1);
   SetIndexStyle(3,DRAW_LINE);
   SetIndexBuffer(3,BBuffer1);
 
//----
	
	
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- 
   
//----
   return(0);
  }

void DelObj()
{
	ObjectDelete("TL1");
	ObjectDelete("TL2");
	ObjectDelete("MIDL");
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
//---- 
	if ((AllBars==0) || (Bars<AllBars)) AB=Bars; else AB=AllBars; //AB-êîëè÷???âî î??÷è?ûâà??û? ?à?îâ
	if (BarsForFract>0) 
		BFF=BarsForFract; 
	else
	{
		switch (Period())
		{
			case 1: BFF=12; break;
			case 5: BFF=48; break;
			case 15: BFF=24; break;
			case 30: BFF=24; break;
			case 60: BFF=12; break;
			case 240: BFF=15; break;
			case 1440: BFF=10; break;
			case 10080: BFF=6; break;
			default: DelObj(); return(-1); break;
		}
	}
	CurrentBar=2; //?÷è?à?? ? ????ü??î ?à?à, ÷?î?û ô?àê?àë "çàê??ïèë??
	B1=-1; B2=-1; UpDown=0;
	while(((B1==-1) || (B2==-1)) && (CurrentBar<AB))
	{
		//UpDown=1 ç?à÷è? ï??âûé ô?àê?àë ?àé??? ?â????, UpDown=-1 ç?à÷è? ï??âûé ô?àê?àë
		//?àé??? ??èç?, UpDown=0 ç?à÷è? ô?àê?àë ?ù¸ ?? ?àé???.
		//A1 è A2 - ?î???à ?à?îâ ? ô?àê?àëà?è, ÷???ç ?è? ???îè? îïî???? ëè?è?.
		//?1 è ?2 - ?îî?â????â???î ???û ÷???ç êî?î?û? ????? ëè?è? ï?îâî?è?ü

		if((UpDown<1) && (CurrentBar==Lowest(Symbol(),Period(),MODE_LOW,BFF*2+1,CurrentBar-BFF))) 
		{
			if(UpDown==0) { UpDown=-1; B1=CurrentBar; P1=Low[B1]; }
			else { B2=CurrentBar; P2=Low[B2];}
		}
		if((UpDown>-1) && (CurrentBar==Highest(Symbol(),Period(),MODE_HIGH,BFF*2+1,CurrentBar-BFF))) 
		{
			if(UpDown==0) { UpDown=1; B1=CurrentBar; P1=High[B1]; }
			else { B2=CurrentBar; P2=High[B2]; }
		}
		CurrentBar++;
	}
	if((B1==-1) || (B2==-1)) {DelObj(); return(-1);} // C?à÷è? ?? ?à?ëè ô?àê?àëîâ ????è 300 ?à?îâ 8-)
	Step=(P2-P1)/(B2-B1);//Aû÷è?ëèëè ?à?, ??ëè î? ïîëî?è??ëü?ûé, ?î êà?àë ?è??î??ùèé
	P1=P1-B1*Step; B1=0;//ï?????àâë??? ???? è ï??âûé ?à? ê ??ë?
	//A ??ï??ü îïî???? ?î÷ê? ï?î?èâîïîëî??îé ëè?èè êà?àëà.
	ishift=0; iprice=0;
	if(UpDown==1)
	{ 
		PP=Low[2]-2*Step;
		for(i=3;i<=B2;i++) 
		{
			if(Low[i]<PP+Step*i) { PP=Low[i]-i*Step; }
		}
		if(Low[0]<PP) {ishift=0; iprice=PP;}
		if(Low[1]<PP+Step) {ishift=1; iprice=PP+Step;}
		if(High[0]>P1) {ishift=0; iprice=P1;}
		if(High[1]>P1+Step) {ishift=1; iprice=P1+Step;}
	} 
	else
	{ 
		PP=High[2]-2*Step;
		for(i=3;i<=B2;i++) 
		{
			if(High[i]>PP+Step*i) { PP=High[i]-i*Step;}
		}
		if(Low[0]<P1) {ishift=0; iprice=P1;}
		if(Low[1]<P1+Step) {ishift=1; iprice=P1+Step;}
		if(High[0]>PP) {ishift=0; iprice=PP;}
		if(High[1]>PP+Step) {ishift=1; iprice=PP+Step;}
	}
	//??ï??ü ï?????àâè? êî??÷??? ???? è ?à? ?à AA, ÷?î?û ëè?èè êà?àëà ?è?îâàëè?ü ïî?ëè????
	P2=P1+AB*Step;
	T1=Time[B1]; T2=Time[AB];

	//??ëè ?? ?ûëî ï?????÷??è? êà?àëà, ?î 0, è?à÷? ??àâè? ï?è??.
	if(iprice!=0) ExtMapBuffer1[ishift]=iprice;
	
	for(i=0;i<=240;i++)
   {
	if (Step<=0)
	{
	midBuffer1[i]=(P1+PP)/2-MathAbs(Step*i);
	ABuffer1[i]=(P1+PP)/2-MathAbs(Step*i)+MathAbs(PP - P1)/2;
	BBuffer1[i]=(P1+PP)/2-MathAbs(Step*i)-MathAbs(PP - P1)/2;
	}
	else
	{
		midBuffer1[i]=(P1+PP)/2+MathAbs(Step*i);
		ABuffer1[i]=(P1+PP)/2+MathAbs(Step*i)+MathAbs(PP - P1)/2;
   	BBuffer1[i]=(P1+PP)/2+MathAbs(Step*i)-MathAbs(PP - P1)/2;
	}
	}
	DelObj();
 
		Comment(" Channel size = ", DoubleToStr(MathAbs(PP - P1)/Point,0), " Slope = ", DoubleToStr(-Step/Point, 2));
//----
   return(0);
  }
//+------------------------------------------------------------------+