//+------------------------------------------------------------------+
//| Williams’ Percent Range.mq4 |
//| Copyright © 2005, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net/"
//----
#property indicator_separate_window
#property indicator_minimum -100
#property indicator_maximum 0
#property indicator_buffers 1
#property indicator_color1 DodgerBlue
#property indicator_level1 -20
#property indicator_level2 -80
#property indicator_level3 -50
//---- input parameters
extern int ExtWPRPeriod = 14;
extern string note = "turn on Alert = true; turn off = false";
extern bool AlertOn = true;
extern int BullLevel=-80;
extern int BearLevel=-20;
//---- buffers
double ExtWPRBuffer[];
// Show regular timeframe string (HCY)
string AlertPrefix;
string GetTimeFrameStr() {
switch(Period())
{
case 1 : string TimeFrameStr="M1"; break;
case 5 : TimeFrameStr="M5"; break;
case 15 : TimeFrameStr="M15"; break;
case 30 : TimeFrameStr="M30"; break;
case 60 : TimeFrameStr="H1"; break;
case 240 : TimeFrameStr="H4"; break;
case 1440 : TimeFrameStr="D1"; break;
case 10080 : TimeFrameStr="W1"; break;
case 43200 : TimeFrameStr="MN1"; break;
default : TimeFrameStr="CUR";
}
return (TimeFrameStr);
}
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
string sShortName;
//---- indicator buffer mapping
SetIndexBuffer(0, ExtWPRBuffer);
//---- indicator line
SetIndexStyle(0, DRAW_LINE);
//---- name for DataWindow and indicator subwindow label
sShortName="%R(" + ExtWPRPeriod + ")";
IndicatorShortName(sShortName);
SetIndexLabel(0, sShortName);
//---- first values aren't drawn
SetIndexDrawBegin(0, ExtWPRPeriod);
//----
AlertPrefix=Symbol()+" ("+GetTimeFrameStr()+"): ";
return(0);
}
//+------------------------------------------------------------------+
//| Williams’ Percent Range |
//+------------------------------------------------------------------+
int start()
{
int i, nLimit, nCountedBars;
//---- insufficient data
if(Bars <= ExtWPRPeriod)
return(0);
//---- bars count that does not changed after last indicator launch.
nCountedBars = IndicatorCounted();
//----Williams’ Percent Range calculation
i = Bars - ExtWPRPeriod - 1;
if(nCountedBars > ExtWPRPeriod)
i = Bars - nCountedBars - 1;
while(i >= 0)
{
double dMaxHigh = High[Highest(NULL, 0, MODE_HIGH, ExtWPRPeriod, i)];
double dMinLow = Low[Lowest(NULL, 0, MODE_LOW, ExtWPRPeriod, i)];
if(!CompareDouble((dMaxHigh - dMinLow), 0.0))
ExtWPRBuffer[i] = -100*(dMaxHigh - Close[i]) / (dMaxHigh - dMinLow);
i--;
}
//----
// ======= Alert =========
if(AlertOn && NewBar()){
if((ExtWPRBuffer[0] <= BullLevel) && (ExtWPRBuffer[0] <=-indicator_minimum))
Alert(AlertPrefix+" %R("+ExtWPRPeriod+") Buy Alert "+ ExtWPRBuffer[0]);
else
if((ExtWPRBuffer[0] >= BearLevel) && (ExtWPRBuffer[0] <=indicator_maximum))
Alert(AlertPrefix+" %R("+ExtWPRPeriod+") Sell Alert "+ ExtWPRBuffer[0]);
}
// ======= Alert Ends =========
return(0);
}
//+------------------------------------------------------------------+
//| Ôóíêöèÿ ñðàíåíèÿ äâóõ âåùåñòâåííûõ ÷èñåë. |
//+------------------------------------------------------------------+
bool CompareDouble(double Number1, double Number2)
{
bool Compare = NormalizeDouble(Number1 - Number2, 8) == 0;
return(Compare);
}
//+------------------------------------------------------------------+
bool NewBar()
{
static datetime lastbar;
datetime curbar = Time[0];
//Print("NewBar(). lastbar="+TimeToStr(lastbar,TIME_DATE|TIME_MINUTES)+" curbar="+TimeToStr(curbar,TIME_DATE|TIME_MINUTES));
if(lastbar!=curbar)
{
lastbar=curbar;
return (true);
}
else
{
return(false);
}
}
Sample
Analysis
Market Information Used:
Series array that contains the highest prices of each bar
Series array that contains the lowest prices of each bar
Series array that contains close prices for each bar
Series array that contains open time of each bar
Indicator Curves created:
Implements a curve of type DRAW_LINE
Indicators Used:
Custom Indicators Used:
Order Management characteristics:
Other Features:
It issuies visual alerts to the screen