Linien einfärben
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Hallo,
ich bin noch recht neu im Programmieren.
Mein Anliegen ist es, eine EMA Linie einzufärben, und zwar je nachdem ob die Linie eine bestimmte Steigung aufweist oder nicht. Dies frage ich über eine Bedingung ab. Jetzt möchte ich eine weitere Bedingung schreiben, welche die erste Bedingung abfragt und in dem Fall dann den EMA an der entsprechenden Stelle einfärbt.
Hier ist der EMA, der standardmäßig im MT4 enthalten ist.
//| Custom Moving Averages.mq4 |
//| Copyright 2005-2015, MetaQuotes Software Corp. |
//| http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright "2005-2015, MetaQuotes Software Corp."
#property link "http://www.mql4.com"
#property description "Moving Average"
#property strict
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
//--- indicator parameters
input int InpMAPeriod=13; // Period
input int InpMAShift=0; // Shift
input ENUM_MA_METHOD InpMAMethod=MODE_SMA; // Method
//--- indicator buffer
double ExtLineBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit(void)
{
string short_name;
int draw_begin=InpMAPeriod-1;
//--- indicator short name
switch(InpMAMethod)
{
case MODE_SMA : short_name="SMA("; break;
case MODE_EMA : short_name="EMA("; draw_begin=0; break;
case MODE_SMMA : short_name="SMMA("; break;
case MODE_LWMA : short_name="LWMA("; break;
default : return(INIT_FAILED);
}
IndicatorShortName(short_name+string(InpMAPeriod)+")");
IndicatorDigits(Digits);
//--- check for input
if(InpMAPeriod<2)
return(INIT_FAILED);
//--- drawing settings
SetIndexStyle(0,DRAW_LINE);
SetIndexShift(0,InpMAShift);
SetIndexDrawBegin(0,draw_begin);
//--- indicator buffers mapping
SetIndexBuffer(0,ExtLineBuffer);
//--- initialization done
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Moving Average |
//+------------------------------------------------------------------+
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[])
{
//--- check for bars count
if(rates_total<InpMAPeriod-1 || InpMAPeriod<2)
return(0);
//--- counting from 0 to rates_total
ArraySetAsSeries(ExtLineBuffer,false);
ArraySetAsSeries(close,false);
//--- first calculation or number of bars was changed
if(prev_calculated==0)
ArrayInitialize(ExtLineBuffer,0);
//--- calculation
switch(InpMAMethod)
{
case MODE_EMA: CalculateEMA(rates_total,prev_calculated,close); break;
case MODE_LWMA: CalculateLWMA(rates_total,prev_calculated,close); break;
case MODE_SMMA: CalculateSmoothedMA(rates_total,prev_calculated,close); break;
case MODE_SMA: CalculateSimpleMA(rates_total,prev_calculated,close); break;
}
//--- return value of prev_calculated for next call
return(rates_total);
}
//+------------------------------------------------------------------+
//| simple moving average |
//+------------------------------------------------------------------+
void CalculateSimpleMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
//--- calculate first visible value
double firstValue=0;
for(i=0; i<limit; i++)
firstValue+=price[i];
firstValue/=InpMAPeriod;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=ExtLineBuffer[i-1]+(price[i]-price[i-InpMAPeriod])/InpMAPeriod;
//---
}
//+------------------------------------------------------------------+
//| exponential moving average |
//+------------------------------------------------------------------+
void CalculateEMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
double SmoothFactor=2.0/(1.0+InpMAPeriod);
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
ExtLineBuffer[0]=price[0];
for(i=1; i<limit; i++)
ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
//---
}
//+------------------------------------------------------------------+
//| linear weighted moving average |
//+------------------------------------------------------------------+
void CalculateLWMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
static int weightsum;
double sum;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
weightsum=0;
limit=InpMAPeriod;
//--- calculate first visible value
double firstValue=0;
for(i=0;i<limit;i++)
{
int k=i+1;
weightsum+=k;
firstValue+=k*price[i];
}
firstValue/=(double)weightsum;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
{
sum=0;
for(int j=0;j<InpMAPeriod;j++)
sum+=(InpMAPeriod-j)*price[i-j];
ExtLineBuffer[i]=sum/weightsum;
}
//---
}
//+------------------------------------------------------------------+
//| smoothed moving average |
//+------------------------------------------------------------------+
void CalculateSmoothedMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
double firstValue=0;
for(i=0; i<limit; i++)
firstValue+=price[i];
firstValue/=InpMAPeriod;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=(ExtLineBuffer[i-1]*(InpMAPeriod-1)+price[i])/InpMAPeriod;
//---
}
//+------------------------------------------------------------------+
für die Bedingung verwende ich:
double LEma1,LEma2,SEma1,SEma2;
bool TrendSlope;
double CurrVal;
color colorw;
extern int Periode=5;
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[])
{
LEma1 = iMA(NULL,0,34,0,MODE_EMA,PRICE_HIGH,1);
LEma2 = iMA(NULL,0,34,0,MODE_EMA,PRICE_HIGH,Periode+1);
SEma1 = iMA(NULL,0,34,0,MODE_EMA,PRICE_LOW,1);
SEma2 = iMA(NULL,0,34,0,MODE_EMA,PRICE_LOW,Periode+1);
if((LEma1-LEma2)/Periode >=CurrVal)
{
TrendSlope = true;
}
else if((SEma1-SEma2)/Periode <=-CurrVal)
{
TrendSlope = true;
}
else TrendSlope = false;
return(rates_total);
}
Derzeit wird die Bedingung mit jeder Periode aktulisiert. Ich würde allerdings Vergangenheitswerte speichern, so dass der Indikator an den Stelle, an der die Bedingung gegolten hat, die entsprechende Farbe bekommt (grün für Kaufsignale, Rot für verkaufsignale) und nicht sicht die gesamte Linie des EMA jedes mal umfärbt, wenn die Bedingung sich aktuell ändert.