forked from rosh/MQL5Book
103 lines
3.9 KiB
MQL5
103 lines
3.9 KiB
MQL5
//+------------------------------------------------------------------+
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//| UseEnvelopesParams1.mq5 |
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//| Copyright 2021, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property indicator_chart_window
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#property indicator_buffers 2
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#property indicator_plots 2
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// drawing settings
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#property indicator_type1 DRAW_LINE
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#property indicator_color1 clrBlue
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#property indicator_width1 1
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#property indicator_label1 "Upper"
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#property indicator_style1 STYLE_DOT
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#property indicator_type2 DRAW_LINE
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#property indicator_color2 clrRed
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#property indicator_width2 1
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#property indicator_label2 "Lower"
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#property indicator_style2 STYLE_DOT
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#include "..\..\Include\PRTF.mqh"
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input int WorkPeriod = 14;
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input int Shift = 0;
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input ENUM_MA_METHOD Method = MODE_EMA;
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input ENUM_APPLIED_PRICE Price = PRICE_TYPICAL;
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input double Deviation = 0.1;
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// indicator buffer
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double UpBuffer[];
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double DownBuffer[];
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// global variable for subordinate indicator
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int Handle;
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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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IndicatorSetString(INDICATOR_SHORTNAME,
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StringFormat("Env(%d,%d,%.2f)", WorkPeriod, Shift, Deviation));
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// map arrays to indicator buffers
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SetIndexBuffer(0, UpBuffer);
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SetIndexBuffer(1, DownBuffer);
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// Simple way of creating "Envelopes" could be via
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// Handle = iEnvelopes(int period, int shift,
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// ENUM_MA_METHOD method, ENUM_APPLIED_PRICE price, double deviation)
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// But we'll use alternative way based on array of MqlParam
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// Here is an example of verbose code of filling out the array
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MqlParam params[5] = {};
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params[0].type = TYPE_INT;
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params[0].integer_value = WorkPeriod;
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params[1].type = TYPE_INT;
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params[1].integer_value = Shift;
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params[2].type = TYPE_INT;
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params[2].integer_value = Method;
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params[3].type = TYPE_INT;
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params[3].integer_value = Price;
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params[4].type = TYPE_DOUBLE;
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params[4].double_value = Deviation;
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// First try to pass not the whole array, but only 3 elements.
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// This will generate an error, but it's intentional - just for demonstration purpose
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Handle = PRTF(IndicatorCreate(_Symbol, _Period, IND_ENVELOPES, 3, params));
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// EXAMPLE ERROR:
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// indicator Envelopes cannot load [4002]
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// IndicatorCreate(_Symbol,_Period,IND_ENVELOPES,3,params)=-1 / WRONG_INTERNAL_PARAMETER(4002)
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// Second, call IndicatorCreate with complete set of parameters (5 required for Envelopes)
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Handle = PRTF(IndicatorCreate(_Symbol, _Period, IND_ENVELOPES, ArraySize(params), params));
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// SUCCESS:
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// IndicatorCreate(_Symbol,_Period,IND_ENVELOPES,ArraySize(params),params)=10 / ok
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return Handle == INVALID_HANDLE ? INIT_FAILED : 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 int begin,
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const double &data[])
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{
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// wait until the subindicator is calculated for all bars
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if(BarsCalculated(Handle) != rates_total)
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{
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return prev_calculated;
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}
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// copy data from subordinate indicator into our buffers
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const int n = CopyBuffer(Handle, 0, 0, rates_total - prev_calculated + 1, UpBuffer);
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const int m = CopyBuffer(Handle, 1, 0, rates_total - prev_calculated + 1, DownBuffer);
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return n > -1 && m > -1 ? rates_total : 0;
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}
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//+------------------------------------------------------------------+
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