| //+------------------------------------------------------------------+
|
| //| Parabolic Channel.mq5 |
|
| //| Copyright 2009-2025, MetaQuotes Ltd |
|
| //| https://www.mql5.com |
|
| //+------------------------------------------------------------------+
|
| #property copyright "2009-2025, MetaQuotes Ltd"
|
| #property link "http://www.mql5.com"
|
| #property description "Parabolic Channel"
|
|
|
| #property indicator_chart_window
|
| #property indicator_buffers 3
|
| #property indicator_plots 3
|
| #property indicator_type1 DRAW_LINE
|
| #property indicator_color1 clrRoyalBlue
|
| #property indicator_style1 STYLE_SOLID
|
| #property indicator_width1 1
|
| #property indicator_type2 DRAW_ARROW
|
| #property indicator_width2 2
|
| #property indicator_color2 clrDeepSkyBlue
|
| #property indicator_type3 DRAW_LINE
|
| #property indicator_color3 clrDarkOrange
|
| #property indicator_style3 STYLE_SOLID
|
| #property indicator_width3 1
|
| //--- labels
|
| #property indicator_label1 "Upper"
|
| #property indicator_label2 "Parabolic"
|
| #property indicator_label3 "Lower "
|
|
|
| //--- input parameters
|
| input double InpSARStep =0.02; // Step
|
| input double InpSARMaximum=0.2; // Maximum
|
| input bool InpShowLabel =true; // Show price of level
|
|
|
| //--- indicator buffers
|
| double ExtUpperBuffer[];
|
| double ExtParabolicBuffer[];
|
| double ExtLowerBuffer[];
|
|
|
| //--- indicator handle
|
| int ExtParabolicHandle;
|
| //--- unique prefix for indicator objects
|
| string ExtPrefixUniq;
|
| //--- current chart scale
|
| long ExtChartScale=2;
|
| //--- price labels should not be shown on the built-in VPS
|
| bool ExtShowLabel=false;
|
| //+------------------------------------------------------------------+
|
| //| Custom indicator initialization function |
|
| //+------------------------------------------------------------------+
|
| int OnInit()
|
| {
|
| //--- if the indicator is running on the built-in VPS, price labels should not be shown
|
| if(!TerminalInfoInteger(TERMINAL_VPS))
|
| ExtShowLabel=InpShowLabel;
|
|
|
| //--- define buffers
|
| SetIndexBuffer(0, ExtUpperBuffer);
|
| SetIndexBuffer(1, ExtParabolicBuffer);
|
| SetIndexBuffer(2, ExtLowerBuffer);
|
| PlotIndexSetInteger(1,PLOT_ARROW,159);
|
|
|
| //--- indicator name
|
| IndicatorSetString(INDICATOR_SHORTNAME, "Parabolic Channel");
|
| //--- number of digits of indicator value
|
| IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
|
|
|
| //--- create indicators
|
| ExtParabolicHandle=iSAR(NULL,0,InpSARStep,InpSARMaximum);
|
|
|
| //--- prepare prefix for objects
|
| string number=StringFormat("%I64d", GetTickCount64());
|
| ExtPrefixUniq=StringSubstr(number, StringLen(number)-4);
|
| ExtPrefixUniq=ExtPrefixUniq+"_PS";
|
| Print("Indicator \"Parabolic Channels\" started, prefix=", ExtPrefixUniq);
|
|
|
| return(INIT_SUCCEEDED);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Custom indicator iteration function |
|
| //+------------------------------------------------------------------+
|
| 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[])
|
| {
|
| //--- write Parabolic SAR indicator values to the buffer
|
| if(CopyBuffer(ExtParabolicHandle, 0, 0, rates_total, ExtParabolicBuffer)<0)
|
| return(0);
|
|
|
| //--- start calculations from the bar preceding the last one
|
| int start=prev_calculated-2;
|
|
|
| //--- if this is the first calculation of the indicator
|
| if(prev_calculated==0)
|
| {
|
| start=1;
|
| ArrayFill(ExtUpperBuffer,0,rates_total,0);
|
| ArrayFill(ExtLowerBuffer,0,rates_total,0);
|
| ExtUpperBuffer[start-1]=close[start-1];
|
| ExtLowerBuffer[start-1]=open[start-1];
|
| }
|
|
|
| for(int i=start; i<rates_total; i++)
|
| {
|
| ExtUpperBuffer[i]=ExtUpperBuffer[i-1];
|
| ExtLowerBuffer[i]=ExtLowerBuffer[i-1];
|
|
|
| //--- check if the parabolic has jumped down
|
| if(close[i]>ExtParabolicBuffer[i] && close[i-1]<ExtParabolicBuffer[i-1])
|
| ExtLowerBuffer[i]=ExtParabolicBuffer[i];
|
|
|
| //--- check if the parabolic has jumped up
|
| if(close[i]<ExtParabolicBuffer[i] && close[i-1]>ExtParabolicBuffer[i-1])
|
| ExtUpperBuffer[i]=ExtParabolicBuffer[i];
|
| }
|
|
|
| //--- draw labels on levels
|
| if(ExtShowLabel)
|
| {
|
| ShowPriceLevels(time[rates_total-1], rates_total-1);
|
| ChartRedraw();
|
| }
|
|
|
| //--- succesfully calculated
|
| return(rates_total);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Custom indicator deinitialization function |
|
| //+------------------------------------------------------------------+
|
| void OnDeinit(const int reason)
|
| {
|
| //--- delete all our graphical objects after use
|
| Print("Indicator \"Parabolic Channel\" stopped, delete all objects with prefix=", ExtPrefixUniq);
|
| ObjectsDeleteAll(0, ExtPrefixUniq, 0, OBJ_ARROW_RIGHT_PRICE);
|
| ChartRedraw(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Handles CHARTEVENT_CHART_CHANGE to track chart window updates |
|
| //+------------------------------------------------------------------+
|
| void OnChartEvent(const int id, const long& lparam, const double& dparam, const string& sparam)
|
| {
|
| if(id==CHARTEVENT_CHART_CHANGE)
|
| if(!ChartGetInteger(0, CHART_SCALE, 0, ExtChartScale))
|
| {
|
| //--- output an error message to the Experts journal
|
| Print(__FUNCTION__+", ChartGetInteger(CHART_SCALE) failed, error = ", GetLastError());
|
| }
|
| //---
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Show prices' levels |
|
| //+------------------------------------------------------------------+
|
| void ShowPriceLevels(datetime time, int last_index)
|
| {
|
| ShowRightPrice(ExtPrefixUniq+"_Upper", time, ExtUpperBuffer[last_index], clrRoyalBlue);
|
| ShowRightPrice(ExtPrefixUniq+"_Parabolic", time, ExtParabolicBuffer[last_index], clrDeepSkyBlue);
|
| ShowRightPrice(ExtPrefixUniq+"_Lower", time, ExtLowerBuffer[last_index], clrDarkOrange);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Create or Update "Right Price Label" object |
|
| //+------------------------------------------------------------------+
|
| bool ShowRightPrice(const string name, datetime time, double price, color clr)
|
| {
|
| if(!ObjectCreate(0, name, OBJ_ARROW_RIGHT_PRICE, 0, time, price))
|
| {
|
| ObjectMove(0, name, 0, time, price);
|
| return(false);
|
| }
|
|
|
| //--- adjust label size based on chart scale
|
| int width=ExtChartScale>1 ? 2:1; // if chart scale > 1, then label size = 2
|
|
|
| ObjectSetInteger(0, name, OBJPROP_COLOR, clr);
|
| ObjectSetInteger(0, name, OBJPROP_STYLE, STYLE_SOLID);
|
| ObjectSetInteger(0, name, OBJPROP_WIDTH, width);
|
| ObjectSetInteger(0, name, OBJPROP_BACK, false);
|
| ObjectSetInteger(0, name, OBJPROP_SELECTABLE, false);
|
| ObjectSetInteger(0, name, OBJPROP_SELECTED, false);
|
| ObjectSetInteger(0, name, OBJPROP_HIDDEN, true);
|
| ObjectSetInteger(0, name, OBJPROP_ZORDER, 0);
|
|
|
| return(true);
|
| }
|
| //+------------------------------------------------------------------+
|
