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Elder Impulse Indicator.afl：源码内容

							//------------------------------------------------------------------------------
//
//  Formula Name:    Elder Impulse Indicator
//  Author/Uploader: Lal 
//  E-mail:          
//  Date/Time Added: 2005-10-28 18:01:49
//  Origin:          Elder's CIMTR
//  Keywords:        Elder, Impulse
//  Level:           medium
//  Flags:           indicator
//  Formula URL:     http://www.amibroker.com/library/formula.php?id=570
//  Details URL:     http://www.amibroker.com/library/detail.php?id=570
//
//------------------------------------------------------------------------------
//
//  Detects an "impulse" in price and plots up/down arrows accordingly along
//  with Close bars.
//
//------------------------------------------------------------------------------
/**************************************************************************
Name		:	Elder Impulse Indicator
Coded by	:	Lal
Date		:	28.10.2005
Note		: 	Please refer to Elder's "Come Into my Trading Room"
				for full details 
******************************************************************************/
// User-defined parameter for EMA periods
EMA_prds = Param("EMA_periods", 12, 1, 30, 1);
// Compute EMA and MACD Histogram
DayEMA		= EMA(Close, EMA_prds);
Histogram	= MACD() - Signal();
// Determine if we have an Impulse UP, DOWN or None
Impulse_Up		=	DayEMA > Ref(DayEMA, -1) AND Histogram > Ref(Histogram, -1);
Impulse_Down	=	DayEMA < Ref(DayEMA, -1) AND Histogram < Ref(Histogram, -1);   
Impulse_None	=	(NOT Impulse_UP) AND (NOT Impulse_Down);
// Compute Weekly MACD and determine whether rising or falling
// Note: uses "non-standard"  parameters!
TimeFrameSet(inWeekly);
MACD_val	=	MACD(5, 8);
Signal_val	=	Signal(5, 8, 5);
Hist_in_w	=	MACD_val - Signal_val;
wh_rising 	= Hist_in_w > Ref(Hist_in_w, -1);
wh_falling 	= Hist_in_w < Ref(Hist_in_w, -1);
TimeFrameRestore();
// Now get Monthly MACD Histogram....
TimeFrameSet(inMonthly);
MACD_val		=	MACD(5, 8);
Signal_val		=	Signal(5, 8, 5);
Hist_in_m		=	MACD_val - Signal_val;
mh_rising = Hist_in_m > Ref(Hist_in_m, -1);
mh_falling = Hist_in_m < Ref(Hist_in_m, -1);
TimeFrameRestore();
wh_rising 	= TimeFrameExpand( wh_rising, inWeekly ); 
wh_falling 	= TimeFrameExpand( wh_falling, inWeekly ); 
mh_rising 	= TimeFrameExpand(mh_rising, inMonthly);
mh_falling 	= TimeFrameExpand(mh_falling, inMonthly);
kol 	= IIf( wh_rising, colorGreen,  IIf(wh_falling, colorRed, colorLightGrey));
mkol 	= IIf( mh_rising, colorBlue,  IIf(mh_falling, colorYellow, colorLightGrey));
// Plot them all!
Plot(Close, "Close", colorTeal, styleBar);
PlotShapes(shapeUpArrow * Impulse_Up, colorBlue, 0, Low, -12);
PlotShapes(shapeDownArrow * Impulse_Down, colorRed, 0, High, -12);
PlotShapes(shapeSmallCircle * Impulse_None, colorWhite, 0, High, 5);
Plot(10, "ribbon", kol, styleOwnScale|styleArea|styleNoLabel, -12, 156);	// Weekly trend
Plot(10, "ribbon", mkol, styleOwnScale|styleArea|styleNoLabel, -0.5, 150);	// Monthly Trend

						