160 lines
6.1 KiB
MQL5
160 lines
6.1 KiB
MQL5
//+------------------------------------------------------------------+
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//| Donchian Channel.mq5 |
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//| Copyright 2009-2025, MetaQuotes Ltd |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "2009-2025, MetaQuotes Ltd"
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#property link "http://www.mql5.com"
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#property description "Donchian Channel"
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//---
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#property indicator_chart_window
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#property indicator_buffers 3
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#property indicator_plots 3
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#property indicator_type1 DRAW_LINE
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#property indicator_color1 clrBlue
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#property indicator_type2 DRAW_LINE
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#property indicator_color2 clrGray
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#property indicator_type3 DRAW_LINE
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#property indicator_color3 clrRed
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//--- labels
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#property indicator_label1 "Upper Donchian"
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#property indicator_label2 "Middle Donchian"
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#property indicator_label3 "Lower Donchian"
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//--- input parameter
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input int InpDonchianPeriod=20; // period of the channel
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input bool InpShowLabel =true; // show price of the level
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//--- indicator buffers
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double ExtUpBuffer[];
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double ExtMdBuffer[];
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double ExtDnBuffer[];
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//--- unique prefix to identify indicator objects
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string ExtPrefixUniq;
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//+------------------------------------------------------------------+
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//| Custom indicator initialization function |
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//+------------------------------------------------------------------+
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int OnInit()
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{
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//--- define buffers
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SetIndexBuffer(0, ExtUpBuffer);
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SetIndexBuffer(1, ExtMdBuffer);
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SetIndexBuffer(2, ExtDnBuffer);
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//--- set a 1-bar offset for each line
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PlotIndexSetInteger(0, PLOT_SHIFT, 1);
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PlotIndexSetInteger(1, PLOT_SHIFT, 1);
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PlotIndexSetInteger(2, PLOT_SHIFT, 1);
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//--- indicator name
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IndicatorSetString(INDICATOR_SHORTNAME, "Donchian Channel");
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//--- number of digits of indicator value
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IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
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//--- prepare prefix for objects
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string number=StringFormat("%I64d", GetTickCount64());
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ExtPrefixUniq=StringSubstr(number, StringLen(number)-4);
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ExtPrefixUniq=ExtPrefixUniq+"_DN";
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Print("Indicator \"Donchian Channels\" started, prefix=", ExtPrefixUniq);
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return(INIT_SUCCEEDED);
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}
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//+------------------------------------------------------------------+
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//| Custom indicator iteration function |
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//+------------------------------------------------------------------+
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int OnCalculate(const int rates_total,
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const int prev_calculated,
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const datetime &time[],
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const double &open[],
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const double &high[],
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const double &low[],
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const double &close[],
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const long &tick_volume[],
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const long &volume[],
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const int &spread[])
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{
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//--- if the indicator has previously been calculated, start from the bar preceding the last one
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int start=prev_calculated-1;
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//--- if this is the first calculation of the indicator, then move by InpDonchianPeriod bars form the beginning
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if(prev_calculated==0)
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start=InpDonchianPeriod+1;
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//--- calculate levels for all bars in a loop
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for(int i=start; i<rates_total; i++)
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{
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//--- get max/min values for the last InpDonchianPeriod bars
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int highest_bar_index=ArrayMaximum(high, i-InpDonchianPeriod+1, InpDonchianPeriod);
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int lowest_bar_index=ArrayMinimum(low, i-InpDonchianPeriod+1, InpDonchianPeriod);;
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double highest=high[highest_bar_index];
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double lowest=low[lowest_bar_index];
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//--- write values into buffers
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ExtUpBuffer[i]=highest;
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ExtDnBuffer[i]=lowest;
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ExtMdBuffer[i]=(highest+lowest)/2;
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}
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//--- draw labels on levels
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if(InpShowLabel)
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{
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ShowPriceLevels(time[rates_total-1], rates_total-1);
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ChartRedraw();
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}
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//--- succesfully calculated
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return(rates_total);
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}
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//+------------------------------------------------------------------+
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//| Custom indicator deinitialization function |
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//+------------------------------------------------------------------+
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void OnDeinit(const int reason)
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{
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//--- delete all our graphical objects after use
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Print("Indicator \"Donchian Channels\" stopped, delete all objects with prefix=", ExtPrefixUniq);
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ObjectsDeleteAll(0, ExtPrefixUniq, 0, OBJ_ARROW_RIGHT_PRICE);
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ChartRedraw(0);
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}
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//+------------------------------------------------------------------+
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//| Show prices' levels |
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//+------------------------------------------------------------------+
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void ShowPriceLevels(datetime time, int last_index)
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{
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ShowRightPrice(ExtPrefixUniq+"_UP", time, ExtUpBuffer[last_index], clrBlue);
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ShowRightPrice(ExtPrefixUniq+"_MD", time, ExtMdBuffer[last_index], clrGray);
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ShowRightPrice(ExtPrefixUniq+"_Dn", time, ExtDnBuffer[last_index], clrRed);
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}
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//+------------------------------------------------------------------+
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//| Create or Update "Right Price Label" object |
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//+------------------------------------------------------------------+
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bool ShowRightPrice(const string name, datetime time, double price, color clr)
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{
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if(!ObjectCreate(0, name, OBJ_ARROW_RIGHT_PRICE, 0, time, price))
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{
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ObjectMove(0, name, 0, time, price);
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return(false);
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}
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//--- make the label size adaptive
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long scale=2;
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if(!ChartGetInteger(0, CHART_SCALE, 0, scale))
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{
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//--- output an error message to the Experts journal
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Print(__FUNCTION__+", ChartGetInteger(CHART_SCALE) failed, error = ", GetLastError());
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}
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int width=scale>1 ? 2:1; // if chart scale > 1, then label size = 2
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ObjectSetInteger(0, name, OBJPROP_COLOR, clr);
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ObjectSetInteger(0, name, OBJPROP_STYLE, STYLE_SOLID);
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ObjectSetInteger(0, name, OBJPROP_WIDTH, width);
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ObjectSetInteger(0, name, OBJPROP_BACK, false);
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ObjectSetInteger(0, name, OBJPROP_SELECTABLE, false);
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ObjectSetInteger(0, name, OBJPROP_SELECTED, false);
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ObjectSetInteger(0, name, OBJPROP_HIDDEN, true);
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ObjectSetInteger(0, name, OBJPROP_ZORDER, 0);
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return(true);
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}
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//+------------------------------------------------------------------+
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