我编了个试验品. 是indicator.
实际测试, 发现公式中的ma(13)的值和真正的ma(13)差不少. 大家帮我看看.
指标如下:
//+------------------------------------------------------------------+
//| Custom Moving Average.mq4 |
//| Copyright ?2004, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2004, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net/"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
//---- indicator parameters
extern int MA_Period=13;
extern int MA_Shift=0;
extern int MA_Method=0;
double MaCurrent,MaPrevious;
//---- indicator buffers
double ExtMapBuffer;
//----
int ExtCountedBars=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
int draw_begin;
string short_name;
//---- drawing settings
SetIndexStyle(0,DRAW_LINE);
SetIndexShift(0,MA_Shift);
IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
if(MA_Period<2) MA_Period=10;
draw_begin=MA_Period-1;
//---- indicator short name
switch(MA_Method)
{
case 1 : short_name="EMA("; draw_begin=0; break;
case 2 : short_name="SMMA("; break;
case 3 : short_name="LWMA("; break;
default :
MA_Method=0;
short_name="SMA(";
}
IndicatorShortName(short_name+MA_Period+")");
SetIndexDrawBegin(0,draw_begin);
//---- indicator buffers mapping
SetIndexBuffer(0,ExtMapBuffer);
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
int start()
{
if(Bars<=MA_Period) return(0);
ExtCountedBars=IndicatorCounted();
//---- check for possible errors
if (ExtCountedBars<0) return(-1);
//---- last counted bar will be recounted
if (ExtCountedBars>0) ExtCountedBars--;
//----data
MaCurrent=iMA(NULL,0,MA_Period,0,MODE_SMA,PRICE_CLOSE,0);
MaPrevious=iMA(NULL,0,MA_Period,0,MODE_SMA,PRICE_CLOSE,1);
//----up cross
if (Close[1]<=MaPrevious && Close[0]>MaCurrent)
{
Alert("Already crossed. close price at: ", Close[0],"!!!");
}
//----done
return(0);
}
