Support Board

#include "sierrachart.h"




SCDLLName("SNR")


SCSFExport scsf_SNR(SCStudyInterfaceRef sc)
{
  // Section 1 - Set the configuration variables and defaults
  #include "sierrachart.h"

SCDLLName("Enhanced Signal-to-Noise Ratio")

SCSFExport scsf_EnhancedSNR(SCStudyInterfaceRef sc)
{
// Input references
SCInputRef Alpha = sc.Input[0];
SCInputRef EmaPeriod = sc.Input[1];
SCInputRef SmaPeriod = sc.Input[2];
SCInputRef Level1 = sc.Input[3];
SCInputRef Level2 = sc.Input[4];

// Subgraph references
SCSubgraphRef SNR = sc.Subgraph[0];
SCSubgraphRef SMA = sc.Subgraph[1];
SCSubgraphRef EMA = sc.Subgraph[2];

// Internal arrays
SCFloatArrayRef Q3 = sc.Subgraph[3].Arrays[0];
SCFloatArrayRef Noise = sc.Subgraph[3].Arrays[1];
SCFloatArrayRef Smooth = sc.Subgraph[3].Arrays[2];
SCFloatArrayRef Detrender = sc.Subgraph[3].Arrays[3];
SCFloatArrayRef I1 = sc.Subgraph[3].Arrays[4];
SCFloatArrayRef Q1 = sc.Subgraph[3].Arrays[5];
SCFloatArrayRef jI = sc.Subgraph[3].Arrays[6];
SCFloatArrayRef jQ = sc.Subgraph[3].Arrays[7];
SCFloatArrayRef I2 = sc.Subgraph[4].Arrays[0];
SCFloatArrayRef Q2 = sc.Subgraph[4].Arrays[1];
SCFloatArrayRef Re = sc.Subgraph[4].Arrays[2];
SCFloatArrayRef Im = sc.Subgraph[4].Arrays[3];
SCFloatArrayRef Per = sc.Subgraph[4].Arrays[4];
SCFloatArrayRef SmoothPeriod = sc.Subgraph[4].Arrays[5];
SCFloatArrayRef Price = sc.Subgraph[4].Arrays[6];

if (sc.SetDefaults)
{
sc.GraphName = "Enhanced Signal-to-Noise Ratio";
sc.StudyDescription = "Enhanced SNR with Hilbert Transform and adaptive period detection";
sc.AutoLoop = 0;
sc.GraphRegion = 1;

// Input defaults
Alpha.Name = "Alpha (Smoothing)";
Alpha.SetFloat(0.33f);
Alpha.SetFloatLimits(0.01f, 1.0f);

EmaPeriod.Name = "EMA Period";
EmaPeriod.SetFloat(3.0f);
EmaPeriod.SetFloatLimits(1.0f, 100.0f);

SmaPeriod.Name = "SMA Period";
SmaPeriod.SetInt(12);
SmaPeriod.SetIntLimits(1, 200);

Level1.Name = "Level 1";
Level1.SetFloat(6.0f);

Level2.Name = "Level 2";
Level2.SetFloat(0.0f);

// Subgraph settings
SNR.Name = "SNR";
SNR.DrawStyle = DRAWSTYLE_LINE;
SNR.PrimaryColor = RGB(128, 128, 128); // Dark Gray
SNR.LineWidth = 1;
SNR.DrawZeros = false;

SMA.Name = "SMA";
SMA.DrawStyle = DRAWSTYLE_DASH;
SMA.PrimaryColor = RGB(255, 215, 0); // Gold
SMA.LineWidth = 1;
SMA.DrawZeros = false;

EMA.Name = "EMA";
EMA.DrawStyle = DRAWSTYLE_LINE;
EMA.PrimaryColor = RGB(30, 144, 255); // Dodger Blue
EMA.LineWidth = 2;
EMA.DrawZeros = false;

return;
}

  
  // Section 2 - Do data processing here
  
   // Calculation
int MinBar = 7;
int StartIndex = sc.UpdateStartIndex;

if (StartIndex < MinBar)
StartIndex = MinBar;

for (int i = StartIndex; i < sc.ArraySize; i++)
{
// Calculate median price
Price[i] = (sc.High[i] + sc.Low[i]) / 2.0f;

// Hilbert Transform calculation
if (i >= 6)
{
// Smooth price
Smooth[i] = (4.0f * Price[i] + 3.0f * Price[i-1] + 2.0f * Price[i-2] + Price[i-3]) / 10.0f;

if (i >= 6 && Per[i-1] > 0)
{
// Detrender
Detrender[i] = (0.0962f * Smooth[i] + 0.5769f * Smooth[i-2] -
0.5769f * Smooth[i-4] - 0.0962f * Smooth[i-6]) * (0.075f * Per[i-1] + 0.54f);

// InPhase and Quadrature components
Q1[i] = (0.0962f * Detrender[i] + 0.5769f * Detrender[i-2] -
0.5769f * Detrender[i-4] - 0.0962f * Detrender[i-6]) * (0.075f * Per[i-1] + 0.54f);
I1[i] = Detrender[i-3];

// Advance phase by 90 degrees
jI[i] = (0.0962f * I1[i] + 0.5769f * I1[i-2] -
0.5769f * I1[i-4] - 0.0962f * I1[i-6]) * (0.075f * Per[i-1] + 0.54f);
jQ[i] = (0.0962f * Q1[i] + 0.5769f * Q1[i-2] -
0.5769f * Q1[i-4] - 0.0962f * Q1[i-6]) * (0.075f * Per[i-1] + 0.54f);

// Phasor Addition
I2[i] = I1[i] - jQ[i];
Q2[i] = Q1[i] + jI[i];

// Smooth I and Q components
I2[i] = 0.2f * I2[i] + 0.8f * I2[i-1];
Q2[i] = 0.2f * Q2[i] + 0.8f * Q2[i-1];

// Homodyne Discriminator
Re[i] = I2[i] * I2[i-1] + Q2[i] * Q2[i-1];
Im[i] = I2[i] * Q2[i-1] - Q2[i] * I2[i-1];
Re[i] = 0.2f * Re[i] + 0.8f * Re[i-1];
Im[i] = 0.2f * Im[i] + 0.8f * Im[i-1];

// Calculate period
if (Im[i] != 0 && Re[i] != 0)
Per[i] = 2.0f * (float)M_PI / atan(Im[i] / Re[i]);
else
Per[i] = Per[i-1];

// Limit period changes
if (Per[i] > 1.5f * Per[i-1])
Per[i] = 1.5f * Per[i-1];
if (Per[i] < 0.67f * Per[i-1])
Per[i] = 0.67f * Per[i-1];
if (Per[i] < 6)
Per[i] = 6;
if (Per[i] > 50)
Per[i] = 50;

Per[i] = 0.2f * Per[i] + 0.8f * Per[i-1];
SmoothPeriod[i] = Alpha.GetFloat() * Per[i] + (1.0f - Alpha.GetFloat()) * SmoothPeriod[i-1];
}
else
{
Per[i] = 10.0f;
SmoothPeriod[i] = 10.0f;
}

// Calculate Q3
Q3[i] = 0.5f * (Smooth[i] - Smooth[i-2]) * (0.1759f * SmoothPeriod[i] + 0.4607f);

// Calculate I3
int sp = (int)ceil(SmoothPeriod[i] / 2.0f);
if (sp == 0) sp = 1;
if (sp > i) sp = i;

float i3 = 0.0f;
for (int j = 0; j < sp; j++)
{
i3 += Q3[i-j];
}
i3 = (1.57f * i3) / (float)sp;

// Calculate signal and noise
float signal = pow(i3, 2) + pow(Q3[i], 2);
Noise[i] = 0.1f * pow((sc.High[i] - sc.Low[i]), 2) * 0.25f + 0.9f * Noise[i-1];

// Calculate SNR
if (Noise[i] != 0.0f && signal != 0.0f)
{
SNR[i] = Alpha.GetFloat() * (10.0f * log10(signal / Noise[i])) +
(1.0f - Alpha.GetFloat()) * SNR[i-1];
}
else
{
SNR[i] = SNR[i-1];
}
}

// Calculate SMA
if (i >= SmaPeriod.GetInt() - 1)
{
float sum = 0.0f;
for (int j = 0; j < SmaPeriod.GetInt(); j++)
{
sum += SNR[i-j];
}
SMA[i] = sum / (float)SmaPeriod.GetInt();
}

// Calculate EMA
if (i == MinBar)
{
EMA[i] = SNR[i];
}
else
{
float emaAlpha = 2.0f / (1.0f + EmaPeriod.GetFloat());
EMA[i] = emaAlpha * SNR[i] + (1.0f - emaAlpha) * EMA[i-1];
}
}

// Set reference lines
sc.Subgraph[0].LineLabel = SC_LL_DISPLAY_VALUE | SC_LL_VALUE_ALIGN_VALUES_SCALE;
sc.Subgraph[1].LineLabel = SC_LL_DISPLAY_VALUE | SC_LL_VALUE_ALIGN_VALUES_SCALE;
sc.Subgraph[2].LineLabel = SC_LL_DISPLAY_VALUE | SC_LL_VALUE_ALIGN_VALUES_SCALE;
}

#property indicator_buffers 3
#property indicator_color1 clrDarkGray
#property indicator_color2 clrGold
#property indicator_color3 clrDodgerBlue

#property indicator_width3 2
#property indicator_style2 STYLE_DOT
#property indicator_levelcolor clrSlateGray
#property indicator_levelstyle STYLE_DOT


input double Alpha = 0.33; //Default 0.33
input double EmaPeriod = 3.0;
input int SmaPeriod = 12;
input double Level1 = 6.0;
input double Level2 = 0.0;

double snr[];
double sma[];
double q3[], noise[];
double ema[];

double Smooth[], Detrender[], I1[], Q1[], jI[], jQ[], I2[], Q2[], Re[], Im[], Per[], SmoothPeriod[], price[];

static int MINBAR = 7;

int OnInit() {

IndicatorBuffers(18);
SetIndexBuffer(0,snr,INDICATOR_DATA);
SetIndexBuffer(1,sma,INDICATOR_DATA);
SetIndexBuffer(2,ema,INDICATOR_DATA);
SetIndexBuffer(3,q3,INDICATOR_CALCULATIONS);
SetIndexBuffer(4,noise,INDICATOR_CALCULATIONS);

SetIndexBuffer(5,Smooth,INDICATOR_CALCULATIONS);
SetIndexBuffer(6,Detrender,INDICATOR_CALCULATIONS);
SetIndexBuffer(7,I1,INDICATOR_CALCULATIONS);
SetIndexBuffer(8,Q1,INDICATOR_CALCULATIONS);
SetIndexBuffer(9,jI,INDICATOR_CALCULATIONS);
SetIndexBuffer(10,jQ,INDICATOR_CALCULATIONS);
SetIndexBuffer(11,I2,INDICATOR_CALCULATIONS);
SetIndexBuffer(12,Q2,INDICATOR_CALCULATIONS);
SetIndexBuffer(13,Re,INDICATOR_CALCULATIONS);
SetIndexBuffer(14,Im,INDICATOR_CALCULATIONS);
SetIndexBuffer(15,Per,INDICATOR_CALCULATIONS);
SetIndexBuffer(16,SmoothPeriod,INDICATOR_CALCULATIONS);
SetIndexBuffer(17, price, INDICATOR_CALCULATIONS);

IndicatorSetDouble(INDICATOR_LEVELVALUE,0,Level1);
IndicatorSetDouble(INDICATOR_LEVELVALUE,1,Level2);

ArrayInitialize(snr, EMPTY_VALUE);
//ArrayInitialize(cf, 0);
ArrayInitialize(q3, 0);
ArrayInitialize(noise, 0);

ArrayInitialize(Smooth,0);
ArrayInitialize(Detrender,0);
ArrayInitialize(I1,0);
ArrayInitialize(Q1,0);
ArrayInitialize(jI,0);
ArrayInitialize(jQ,0);
ArrayInitialize(I2,0);
ArrayInitialize(Q2,0);
ArrayInitialize(Re,0);
ArrayInitialize(Im,0);
ArrayInitialize(Per,0);
ArrayInitialize(SmoothPeriod,0);
ArrayInitialize(price,0);


IndicatorSetString(INDICATOR_SHORTNAME,"Enhanced SignalNoiseRatio"+" Alpha :"+DoubleToStr(Alpha,4));
IndicatorSetInteger(INDICATOR_DIGITS,_Digits);

return(INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+



//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+

int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[]) {

if(rates_total <= 4) return 0;


int i=rates_total-prev_calculated+1; if (i>=rates_total) i=rates_total-1;



for (; i>=0 && !_StopFlag; i--){

price[i] = (high[i] + low[i]) / 2;
Hilbert(i);
GetValue(high, low, i);

double sum;
for(int z =0; z<SmaPeriod; z++) sum += snr[i+z];
sma[i] = sum/SmaPeriod;

double emaalpha =2.0/(1.0+EmaPeriod);
ema[i] = emaalpha*snr[i] + (1.0-emaalpha)*ema[i+1];


}

return(rates_total);
}


//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+

double ZerroIfEmpty(double value) {
if (value >= EMPTY_VALUE || value <= -EMPTY_VALUE) return 0.0;
return value;
}

//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+

void Hilbert(int i) {
Smooth[i] = (4 * price[i] + 3 * price[i + 1] + 2 * price[i + 2] + price[i + 3]) / 10;
Detrender[i] = (0.0962 * Smooth[i] + 0.5769 * Smooth[i + 2] -
0.5769 * Smooth[i + 4] - 0.0962 * Smooth[i + 6]) * (0.075 * Per[i + 1] + 0.54);
//InPhase and Quadrature components
      Q1[i] = (0.0962 * Detrender[i] + 0.5769 * Detrender[i + 2] -
       0.5769 * Detrender[i + 4] - 0.0962 * Detrender[i + 6]) * (0.075 * Per[i + 1] + 0.54);      
      I1[i] = Detrender[i + 3];
//Advance the phase of I1 and Q1 by 90 degrees
      jI[i] = (0.0962 * I1[i] + 0.5769 * I1[i + 2] -
       0.5769 * I1[i + 4] - 0.0962 * I1[i + 6]) * (0.075 * Per[i + 1] + 0.54);
      jQ[i] = (0.0962 * Q1[i] + 0.5769 * Q1[i + 2] -
       0.5769 * Q1[i + 4] - 0.0962 * Q1[i + 6]) * (0.075 * Per[i + 1] + 0.54);   
//Phasor Addition
      I2[i] = I1[i] - jQ[i];
      Q2[i] = Q1[i] + jI[i];   
//Smooth the I and Q components before applying the discriminator
      I2[i] = 0.2 * I2[i] + 0.8 * I2[i + 1];
      Q2[i] = 0.2 * Q2[i] + 0.8 * Q2[i + 1];     
//Homodyne Discriminator
      Re[i] = I2[i] * I2[i] + Q2[i] * Q2[i + 1];
      Im[i] = I2[i] * Q2[i + 1] - Q2[i] * I2[i + 1];
      Re[i] = 0.2 * Re[i] + 0.8 * Re[i + 1];
      Im[i] = 0.2 * Im[i] + 0.8 * Im[i + 1];     
      
      if(Im[i]!=0 && Re[i]!=0) Per[i] = 2 * M_PI / (MathArctan(Im[i] / Re[i]) );     
      else Per[i] = 0;
      if(Per[i] > 1.5 * Per[i + 1]) Per[i] = 1.5 * Per[i + 1];       
      if(Per[i] < 0.67 * Per[i + 1]) Per[i] = 0.67 * Per[i + 1];       
      if(Per[i] < 6) Per[i] = 6;       
      if(Per[i] > 50) Per[i] = 50;     

      Per[i] = 0.2 * Per[i] + 0.8 * Per[i + 1];
      SmoothPeriod[i] = Alpha * Per[i] + (1.0 - Alpha) * SmoothPeriod[i + 1];     
      //SmoothPeriod[i] = 0.33 * Per[i] + 0.67 * SmoothPeriod[i + 1];     

}// void Hilbert(i)


//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+

double GetValue(const double& h[], const double& l[], int i) {

q3[i] = 0.5 * (Smooth[i] - Smooth[i + 2]) * (0.1759 * SmoothPeriod[i] + 0.4607);

double i3 = 0.0;
int sp = (int)MathCeil(SmoothPeriod[i] / 2);
if (sp == 0) sp = 1;


for (int j = 0; j < sp; j++) {
i3 += q3[j + i];
}
i3 = (1.57 * i3) / sp;


double signal = MathPow(i3, 2) + MathPow(q3[i], 2);

noise[i] = 0.1 * MathPow((h[i] - l[i]), 2) * 0.25 + 0.9 * noise[i + 1];

if (noise[i] != 0.0 && signal != 0) {

double s = ZerroIfEmpty(snr[i + 1]);

snr[i] = Alpha * (10*MathLog(signal / noise[i]) / MathLog(10)) + (1.0-Alpha) * s;

//snr[i] = 0.33 * (10*MathLog(signal / noise[i])) / MathLog(10) + 0.67 * s;
} else {
snr[i] = 0;
}


return snr[i];
}


//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
//
//
//

void iCleanPoint(int i,double& first[],double& second[])
{
if (i>=Bars-3) return;
if ((second[i] != EMPTY_VALUE) && (second[i+1] != EMPTY_VALUE))
second[i+1] = EMPTY_VALUE;
else
if ((first[i] != EMPTY_VALUE) && (first[i+1] != EMPTY_VALUE) && (first[i+2] == EMPTY_VALUE))
first[i+1] = EMPTY_VALUE;
}

void iPlotPoint(int i,double& first[],double& second[],double& from[])
{
if (i>=Bars-2) return;
if (first[i+1] == EMPTY_VALUE)
if (first[i+2] == EMPTY_VALUE)
{ first[i] = from[i]; first[i+1] = from[i+1]; second[i] = EMPTY_VALUE; }
else { second[i] = from[i]; second[i+1] = from[i+1]; first[i] = EMPTY_VALUE; }
else { first[i] = from[i]; second[i] = EMPTY_VALUE; }
}

#include "sierrachart.h"

SCDLLName("Enhanced Signal-to-Noise Ratio")

SCSFExport scsf_EnhancedSNR(SCStudyInterfaceRef sc)
{
// Input references
SCInputRef Alpha = sc.Input[0];
SCInputRef EmaPeriod = sc.Input[1];
SCInputRef SmaPeriod = sc.Input[2];
SCInputRef Level1 = sc.Input[3];
SCInputRef Level2 = sc.Input[4];

// Subgraph references
SCSubgraphRef SNR = sc.Subgraph[0];
SCSubgraphRef SMA = sc.Subgraph[1];
SCSubgraphRef EMA = sc.Subgraph[2];

// Internal arrays
SCFloatArrayRef Q3 = sc.Subgraph[3].Arrays[0];
SCFloatArrayRef Noise = sc.Subgraph[3].Arrays[1];
SCFloatArrayRef Smooth = sc.Subgraph[3].Arrays[2];
SCFloatArrayRef Detrender = sc.Subgraph[3].Arrays[3];
SCFloatArrayRef I1 = sc.Subgraph[3].Arrays[4];
SCFloatArrayRef Q1 = sc.Subgraph[3].Arrays[5];
SCFloatArrayRef jI = sc.Subgraph[3].Arrays[6];
SCFloatArrayRef jQ = sc.Subgraph[3].Arrays[7];
SCFloatArrayRef I2 = sc.Subgraph[4].Arrays[0];
SCFloatArrayRef Q2 = sc.Subgraph[4].Arrays[1];
SCFloatArrayRef Re = sc.Subgraph[4].Arrays[2];
SCFloatArrayRef Im = sc.Subgraph[4].Arrays[3];
SCFloatArrayRef Per = sc.Subgraph[4].Arrays[4];
SCFloatArrayRef SmoothPeriod = sc.Subgraph[4].Arrays[5];
SCFloatArrayRef Price = sc.Subgraph[4].Arrays[6];

if (sc.SetDefaults)
{
sc.GraphName = "Enhanced Signal-to-Noise Ratio";
sc.StudyDescription = "Enhanced SNR with Hilbert Transform and adaptive period detection";
sc.AutoLoop = 0;
sc.GraphRegion = 1;

// Input defaults
Alpha.Name = "Alpha (Smoothing)";
Alpha.SetFloat(0.33f);
Alpha.SetFloatLimits(0.01f, 1.0f);

EmaPeriod.Name = "EMA Period";
EmaPeriod.SetFloat(3.0f);
EmaPeriod.SetFloatLimits(1.0f, 100.0f);

SmaPeriod.Name = "SMA Period";
SmaPeriod.SetInt(12);
SmaPeriod.SetIntLimits(1, 200);

Level1.Name = "Level 1";
Level1.SetFloat(6.0f);

Level2.Name = "Level 2";
Level2.SetFloat(0.0f);

// Subgraph settings
SNR.Name = "SNR";
SNR.DrawStyle = DRAWSTYLE_LINE;
SNR.PrimaryColor = RGB(128, 128, 128); // Dark Gray
SNR.LineWidth = 1;
SNR.DrawZeros = false;

SMA.Name = "SMA";
SMA.DrawStyle = DRAWSTYLE_DASH;
SMA.PrimaryColor = RGB(255, 215, 0); // Gold
SMA.LineWidth = 1;
SMA.DrawZeros = false;

EMA.Name = "EMA";
EMA.DrawStyle = DRAWSTYLE_LINE;
EMA.PrimaryColor = RGB(30, 144, 255); // Dodger Blue
EMA.LineWidth = 2;
EMA.DrawZeros = false;

return;
}

// Section 2 - Do data processing here
// Calculation
int MinBar = 7;
int StartIndex = sc.UpdateStartIndex;

if (StartIndex < MinBar)
StartIndex = MinBar;

for (int i = StartIndex; i < sc.ArraySize; i++)
{
// Calculate median price
Price[i] = (sc.High[i] + sc.Low[i]) / 2.0f;

// Hilbert Transform calculation
if (i >= 6)
{
// Smooth price
Smooth[i] = (4.0f * Price[i] + 3.0f * Price[i-1] + 2.0f * Price[i-2] + Price[i-3]) / 10.0f;

if (i >= 6 && Per[i-1] > 0)
{
// Detrender
Detrender[i] = (0.0962f * Smooth[i] + 0.5769f * Smooth[i-2] -
0.5769f * Smooth[i-4] - 0.0962f * Smooth[i-6]) * (0.075f * Per[i-1] + 0.54f);

// InPhase and Quadrature components
Q1[i] = (0.0962f * Detrender[i] + 0.5769f * Detrender[i-2] -
0.5769f * Detrender[i-4] - 0.0962f * Detrender[i-6]) * (0.075f * Per[i-1] + 0.54f);
I1[i] = Detrender[i-3];

// Advance phase by 90 degrees
jI[i] = (0.0962f * I1[i] + 0.5769f * I1[i-2] -
0.5769f * I1[i-4] - 0.0962f * I1[i-6]) * (0.075f * Per[i-1] + 0.54f);
jQ[i] = (0.0962f * Q1[i] + 0.5769f * Q1[i-2] -
0.5769f * Q1[i-4] - 0.0962f * Q1[i-6]) * (0.075f * Per[i-1] + 0.54f);

// Phasor Addition
I2[i] = I1[i] - jQ[i];
Q2[i] = Q1[i] + jI[i];

// Smooth I and Q components
I2[i] = 0.2f * I2[i] + 0.8f * I2[i-1];
Q2[i] = 0.2f * Q2[i] + 0.8f * Q2[i-1];

// Homodyne Discriminator
Re[i] = I2[i] * I2[i-1] + Q2[i] * Q2[i-1];
Im[i] = I2[i] * Q2[i-1] - Q2[i] * I2[i-1];
Re[i] = 0.2f * Re[i] + 0.8f * Re[i-1];
Im[i] = 0.2f * Im[i] + 0.8f * Im[i-1];

// Calculate period
if (Im[i] != 0 && Re[i] != 0)
Per[i] = 2.0f * (float)M_PI / atan(Im[i] / Re[i]);
else
Per[i] = Per[i-1];

// Limit period changes
if (Per[i] > 1.5f * Per[i-1])
Per[i] = 1.5f * Per[i-1];
if (Per[i] < 0.67f * Per[i-1])
Per[i] = 0.67f * Per[i-1];
if (Per[i] < 6)
Per[i] = 6;
if (Per[i] > 50)
Per[i] = 50;

Per[i] = 0.2f * Per[i] + 0.8f * Per[i-1];
SmoothPeriod[i] = Alpha.GetFloat() * Per[i] + (1.0f - Alpha.GetFloat()) * SmoothPeriod[i-1];
}
else
{
Per[i] = 10.0f;
SmoothPeriod[i] = 10.0f;
}

// Calculate Q3
Q3[i] = 0.5f * (Smooth[i] - Smooth[i-2]) * (0.1759f * SmoothPeriod[i] + 0.4607f);

// Calculate I3
int sp = (int)ceil(SmoothPeriod[i] / 2.0f);
if (sp == 0) sp = 1;
if (sp > i) sp = i;

float i3 = 0.0f;
for (int j = 0; j < sp; j++)
{
i3 += Q3[i-j];
}
i3 = (1.57f * i3) / (float)sp;

// Calculate signal and noise
float signal = pow(i3, 2) + pow(Q3[i], 2);
Noise[i] = 0.1f * pow((sc.High[i] - sc.Low[i]), 2) * 0.25f + 0.9f * Noise[i-1];

// Calculate SNR
if (Noise[i] != 0.0f && signal != 0.0f)
{
SNR[i] = Alpha.GetFloat() * (10.0f * log10(signal / Noise[i])) +
(1.0f - Alpha.GetFloat()) * SNR[i-1];
}
else
{
SNR[i] = SNR[i-1];
}
}

// Calculate SMA
if (i >= SmaPeriod.GetInt() - 1)
{
float sum = 0.0f;
for (int j = 0; j < SmaPeriod.GetInt(); j++)
{
sum += SNR[i-j];
}
SMA[i] = sum / (float)SmaPeriod.GetInt();
}

// Calculate EMA
if (i == MinBar)
{
EMA[i] = SNR[i];
}
else
{
float emaAlpha = 2.0f / (1.0f + EmaPeriod.GetFloat());
EMA[i] = emaAlpha * SNR[i] + (1.0f - emaAlpha) * EMA[i-1];
}
}

// Set reference lines
sc.Subgraph[0].LineLabel = LL_DISPLAY_VALUE | LL_VALUE_ALIGN_VALUES_SCALE;
sc.Subgraph[1].LineLabel = LL_DISPLAY_VALUE | LL_VALUE_ALIGN_VALUES_SCALE;
sc.Subgraph[2].LineLabel = LL_DISPLAY_VALUE | LL_VALUE_ALIGN_VALUES_SCALE;
}