EMA_Angle_AppliedPrice_Alert
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The EMA Angle indicator is designed to help traders visualize the momentum and direction of the Exponential Moving Average (EMA) by measuring its "slope." Rather than just showing you the price of the moving average, this tool calculates the steepness of its movement to help identify strong trends or periods of consolidation.
How the Logic Works
1. Measuring the Slope The script looks at two specific points on the EMA: a starting point (set by the "StartEMAShift") and an ending point (the "EndEMAShift"). By calculating the difference in value between these two points over a set distance, the tool determines how sharply the moving average is rising or falling.
2. Dynamic Scaling Because different currency pairs have different values (for example, JPY pairs vs. others), the script automatically adjusts its math. It includes internal logic to scale the measurements so that the "angle" remains consistent and readable regardless of which market you are trading.
3. Three-Color Visual Feedback The indicator translates these mathematical calculations into a visual histogram with three distinct states:
- Green (Upward Trend): When the EMA is rising at a steep enough angle to exceed your chosen threshold, the histogram appears in green. This signals strong upward momentum.
- Red (Downward Trend): When the EMA is falling at a steep enough angle to cross the negative threshold, the histogram appears in red. This signals strong downward momentum.
- Yellow (Neutral/Flat): When the angle of the EMA is "near zero"—meaning it is moving sideways or is too flat to be considered a significant trend—the histogram appears in yellow.
4. Smart Notifications The logic includes an automated alert system. It monitors for specific "breaks" in momentum; when the slope shifts from neutral/down to a significant upward move (or vice versa), the script can trigger a sound alert or send an email notification. This allows traders to stay informed about trend changes without having to watch the charts constantly.
Summary of User Experience
Instead of guessing if a moving average is "trending" enough to trade, this tool quantifies that movement. It filters out the "noise" of minor fluctuations by highlighting only significant angles, providing a clear visual distinction between a trending market (Green/Red) and a range-bound market (Yellow).
/*-----------------------------+
| |
| Shared by www.Aptrafx.com |
| |
+------------------------------*/
//+------------------------------------------------------------------+
//| EMA_Angle.mq4 |
//| jpkfox |
//| |
//| You can use this indicator to measure when the EMA angle is |
//| "near zero". AngleTreshold determines when the angle for the |
//| EMA is "about zero": This is when the value is between |
//| [-AngleTreshold, AngleTreshold] (or when the histogram is red). |
//| EMAPeriod: EMA period |
//| AngleTreshold: The angle value is "about zero" when it is |
//| between the values [-AngleTreshold, AngleTreshold]. |
//| StartEMAShift: The starting point to calculate the |
//| angle. This is a shift value to the left from the |
//| observation point. Should be StartEMAShift > EndEMAShift. |
//| StartEMAShift: The ending point to calculate the |
//| angle. This is a shift value to the left from the |
//| observation point. Should be StartEMAShift > EndEMAShift. |
//| |
//| Modified by MrPip |
//| Red for down |
//| Yellow for near zero |
//| Green for up |
//| 10/15/05 MrPip |
//| Corrected problem with USDJPY and optimized code |
//| 10/23/05 Added other JPY crosses |
//| |
//+------------------------------------------------------------------+
#property copyright "jpkfox"
#property link "http://www.strategybuilderfx.com/forums/showthread.php?t=15274&page=1&pp=8"
//---- indicator settings
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 LimeGreen
#property indicator_color2 Yellow
#property indicator_color3 FireBrick
//---- indicator parameters
extern int EMAPeriod=34;
extern int MAAppliedPrice = 0;//0=close, 1=open, 2=high, 3=low, 4=median(high+low)/2, 5=typical(high+low+close)/3, 6=weighted(high+low+close+close)/4
extern double AngleTreshold=15;
extern int StartEMAShift=4;
extern int EndEMAShift=0;
extern bool SoundON=true;
extern bool EmailON=false;
//---- indicator buffers
double UpBuffer[];
double DownBuffer[];
double ZeroBuffer[];
int flagval1 = 0;
int flagval2 = 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- 2 additional buffers are used for counting.
IndicatorBuffers(3);
//---- drawing settings
SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexStyle(1,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_SOLID,2);
IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS)+2);
//---- 3 indicator buffers mapping
if(!SetIndexBuffer(0,UpBuffer) &&
!SetIndexBuffer(1,DownBuffer) &&
!SetIndexBuffer(2,ZeroBuffer))
Print("cannot set indicator buffers!");
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("EMA_Angle("+EMAPeriod+","+AngleTreshold+","+StartEMAShift+","+EndEMAShift+")");
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| The angle for EMA |
//+------------------------------------------------------------------+
int start()
{
double fEndMA, fStartMA;
double fAngle, mFactor, dFactor;
int nLimit, i;
int nCountedBars;
double angle;
int ShiftDif;
string Sym;
if(EndEMAShift >= StartEMAShift)
{
Print("Error: EndEMAShift >= StartEMAShift");
StartEMAShift = 6;
EndEMAShift = 0;
}
nCountedBars = IndicatorCounted();
//---- check for possible errors
if(nCountedBars<0)
return(-1);
//---- last counted bar will be recounted
if(nCountedBars>0)
nCountedBars--;
nLimit = Bars-nCountedBars;
dFactor = 2*3.14159/180.0;
mFactor = 100000.0;
Sym = StringSubstr(Symbol(),3,3);
if (Sym == "JPY") mFactor = 1000.0;
ShiftDif = StartEMAShift-EndEMAShift;
mFactor /= ShiftDif;
//---- main loop
for(i=0; i<nLimit; i++)
{
fEndMA=iMA(NULL,0,EMAPeriod,0,MODE_EMA,MAAppliedPrice,i+EndEMAShift);
fStartMA=iMA(NULL,0,EMAPeriod,0,MODE_EMA,MAAppliedPrice,i+StartEMAShift);
// 10000.0 : Multiply by 10000 so that the fAngle is not too small
// for the indicator Window.
fAngle = mFactor * (fEndMA - fStartMA)/2.0;
// fAngle = MathArctan(fAngle)/dFactor;
DownBuffer[i] = 0.0;
UpBuffer[i] = 0.0;
ZeroBuffer[i] = 0.0;
if(fAngle > AngleTreshold)
{
if (i == 1 && flagval1==0)
{
flagval1=1;
flagval2=0;
if (SoundON) Alert("Slope is UP","\n Symbol=",Symbol()," Period=",Period());
if (EmailON) SendMail("Slope is UP", "Symbol="+Symbol()+" Period="+Period());
}
UpBuffer[i] = fAngle;
}
else if (fAngle < -AngleTreshold)
{
if (i == 1 && flagval2==0)
{
flagval2=1;
flagval1=0;
if (SoundON) Alert("Slope is DOWN","\n Symbol=",Symbol()," Period=",Period());
if (EmailON) SendMail("Slope is Down","Symbol="+Symbol()+" Period="+Period());
}
DownBuffer[i] = fAngle;
}
else ZeroBuffer[i] = fAngle;
}
return(0);
}
//+------------------------------------------------------------------+
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