KDJ
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This script is a technical analysis tool designed to help traders identify potential momentum shifts and overbought or oversold conditions in a financial market. It functions as a sophisticated variation of a standard oscillator, providing several visual layers of data to help interpret price trends more clearly.
Core Logic and Functionality
The tool operates by breaking down price action into three primary levels of calculation:
1. The Foundation (RSV) The script first identifies the highest high and lowest low over a specific period (defined by the user). It then calculates a value called "RSV." Essentially, this measures where the current closing price sits relative to that high-low range as a percentage. Think of this as a way to see if the price is currently hugging the top, bottom, or middle of its recent price history.
2. The Moving Averages (K and D Lines) To smooth out the "noise" of the raw RSV data, the script performs two separate mathematical smoothing operations:
- The K Line: This is a fast-moving average applied to the RSV. It reacts relatively quickly to changes in price momentum.
- The D Line: This is a slower-moving average derived from the K line. Because it is based on the K line rather than the raw price, it acts as a "signal" line, showing the broader trend of the momentum.
3. The Momentum Indicators (J and KDC) Finally, the script generates two extra metrics to provide deeper insights:
- The J Line: This is calculated using a specific ratio between the K and D lines. It acts as a high-sensitivity indicator that can highlight extreme market movements or "exhaustion" points more quickly than the standard lines. The script ensures this value stays within a logical 0 to 100 range.
- The KDC Histogram: This represents the direct difference between the K and D lines. By visualizing this as a histogram, it allows traders to see at a glance whether the momentum is widening (increasing strength) or narrowing (losing steam).
Summary of Visual Output
When viewing this tool on a chart, you are seeing a multi-layered view of market energy:
- The Lines help you identify the current trend and potential "crossover" points where momentum might be changing direction.
- The Histogram provides a visual representation of the strength or weakness of that current move.
- The J Line acts as a specialized alert for extreme price conditions.
By combining these elements, the script allows you to see not just where the price is going, but how much "fuel" or energy is left behind the current move.
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KDJ
//+------------------------------------------------------------------+
//| KDJ.mq4 |
//| senlin ge |
//| http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "senlin ge 20080219"
#property link "mailto:yyy999@people.com.cn"
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_buffers 8
#property indicator_color1 LightSlateGray
#property indicator_color2 0x00ff00
#property indicator_color3 Red
#property indicator_color4 Yellow
#property indicator_color5 0Xffccff
#property indicator_color6 MediumSlateBlue
//---- input parameters
extern int M1=3;
extern int M2=6;
extern int KdjPeriod=30;
//---- buffers
double RsvBuffer[],RSV[],K[],D[],J[],KDC[];
double MaxHigh=0,MinLow=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- name for DataWindow and indicator subwindow label
string short_name;
short_name="KDJ("+KdjPeriod+","+M1+","+M2+") "+"Author:Senlin Ge";
IndicatorShortName(short_name);
SetIndexLabel(0,NULL);
SetIndexLabel(1,"RSV:");
SetIndexLabel(2,"K");
SetIndexLabel(3,"D:");
SetIndexLabel(4,"J");
SetIndexLabel(5,"KDC");
//----
//---- indicators
//---- drawing settings
IndicatorDigits(Digits-2); //setСÊý¾«¶ÈÁ½Î»
//SetIndexStyle(0,DRAW_NONE);
//SetIndexLabel(0,NULL);
SetIndexShift(0,100);
SetIndexStyle(0,DRAW_LINE,2,0);
SetIndexBuffer(0,RsvBuffer);
//----
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,RSV);
SetIndexStyle(2,DRAW_LINE);
SetIndexBuffer(2,K);
SetIndexStyle(3,DRAW_LINE);
SetIndexBuffer(3,D);
SetIndexStyle(4,DRAW_LINE);
SetIndexBuffer(4,J);
SetIndexStyle(5,DRAW_HISTOGRAM);
SetIndexBuffer(5,KDC);
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
int i;
if(Bars<=KdjPeriod) return(0);
//----
i=Bars-counted_bars-1;
while(i>=0)
{
MaxHigh=High[iHighest(NULL,0,MODE_HIGH,KdjPeriod,i)];
MinLow=Low[iLowest(NULL,0,MODE_LOW,KdjPeriod,i)];
RSV[i]=(Close[i]-MinLow)/(MaxHigh-MinLow)*100;
if(i/2)
RsvBuffer[i]=50.0;
i--;
}
Ksma(RSV,M1,2); //get K value
Dsma(K,M2,3); //get D value
//---- //
if(counted_bars>0) counted_bars--;
for(i=Bars-counted_bars-1;i>=0;i--)
{
RsvBuffer[i]=50.0;
J[i]=3*K[i]-2*D[i];
if(J[i]<0) J[i]=0;
if(J[i]>100) J[i]=100;
KDC[i]=K[i]-D[i];
}
//----
return(0);
}
//+------------------------------------------------------------------+
//| Simple Moving Average |
//+------------------------------------------------------------------+
double Dsma(double ArrPara[],int MA_Period,int flag)
{
double sum=0;
int ExtCountedBars=IndicatorCounted();
int i,pos=Bars-IndicatorCounted()-1;
//---- initial accumulation
if(pos<MA_Period) pos=MA_Period;
for(i=1;i<MA_Period;i++,pos--)
sum+=K[pos];
//---- main calculation loop
while(pos>=0)
{
sum+=K[pos]; //¼ÓÉÏ×îеÄKÖµ
switch(flag)
{
case 3: D[pos]=sum/MA_Period;break;
}
sum-=K[pos+MA_Period-1];
pos--;
}
}
//+------------------------------------------------------------------+
//| Simple Moving Average |
//+------------------------------------------------------------------+
double Ksma(double ArrPara[],int MA_Period,int flag)
{
double sum=0;
int ExtCountedBars=IndicatorCounted();
int i,pos=Bars-IndicatorCounted()-1;
//---- initial accumulation
if(pos<MA_Period) pos=MA_Period;
for(i=1;i<MA_Period;i++,pos--)
sum+=RSV[pos];
//---- main calculation loop
while(pos>=0)
{
sum+=RSV[pos]; //¼ÓÉÏ×îеÄRSV[]µÄÖµ
switch(flag)
{
case 2: K[pos]=sum/MA_Period;break;
}
sum-=RSV[pos+MA_Period-1];
pos--;
}
}
//+------------------------------------------------------------------+
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