add chart control
open and draw indicator lines on chart
This commit is contained in:
Gunther Schulz
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//+------------------------------------------------------------------+
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//| JsonAPIIndicator.mq5 |
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//| Copyright 2020, Gunther Schulz |
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//| https://www.guntherschulz.de |
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//+------------------------------------------------------------------+
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#property copyright "2020 Gunther Schulz"
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#property link "https://www.guntherschulz.de"
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#property version "1.00"
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#include <StringToEnumInt.mqh>
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#include <Zmq/Zmq.mqh>
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#include <Json.mqh>
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// Set ports and host for ZeroMQ
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string HOST="localhost";
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int CHART_SUB_PORT=15562;
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// ZeroMQ Cnnections
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Context context("MQL5 JSON API");
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Socket chartLiveSocket(context,ZMQ_SUB);
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//#property indicator_separate_window
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//#property indicator_buffers 1
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//#property indicator_plots 1
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//---- plot MA
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//#property indicator_label1 "MA"
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//#property indicator_type1 DRAW_LINE
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//#property indicator_color1 clrRed
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//#property indicator_style1 STYLE_SOLID
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//#property indicator_width1 1
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//--- input parameters
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input string IndicatorId="";
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input string ShortName="JsonAPI";
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input string ColorSyle = "clrRed";
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input string LineType = "DRAW_LINE";
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input string LineStyle = "STYLE_SOLID";
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input int LineWidth = 1;
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//--- indicator settings
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double Buffer[];
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bool debug = false;
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bool first = false;
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//double Values[];
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//ENUM_TIMEFRAMES originalTF = ChartPeriod();
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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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bool result = chartLiveSocket.connect(StringFormat("tcp://%s:%d", HOST, CHART_SUB_PORT));
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if (result == false) {Print("Failed to subscrbe on port ", CHART_SUB_PORT);}
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else {
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Print("Accepting Chart Indicator data on port ", CHART_SUB_PORT);
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chartLiveSocket.setSubscribe("");
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chartLiveSocket.setLinger(1000);
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// Number of messages to buffer in RAM.
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chartLiveSocket.setReceiveHighWaterMark(5); // TODO confirm settings
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}
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//--- indicator buffers mapping;
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ArraySetAsSeries(Buffer,true);
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SetIndexBuffer(0,Buffer,INDICATOR_DATA);
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color colorstyle = StringToColor(ColorSyle);
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int linetype = StringToEnumInt(LineType);
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int linestyle = StringToEnumInt(LineStyle);
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SetStyle(ShortName, colorstyle, linetype, linestyle, LineWidth);
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//---
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return(INIT_SUCCEEDED);
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}
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void SetStyle(string shortname, color colorstyle, int linetype, int linestyle, int linewidth) {
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IndicatorSetString(INDICATOR_SHORTNAME,shortname);
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PlotIndexSetInteger(0,PLOT_LINE_COLOR,0,colorstyle);
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PlotIndexSetInteger(0,PLOT_DRAW_TYPE,linetype);
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PlotIndexSetInteger(0,PLOT_LINE_STYLE,linestyle);
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PlotIndexSetInteger(0,PLOT_LINE_WIDTH,linewidth);
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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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// While a new candle is forming, set the current value to the previous value
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if(rates_total>prev_calculated){
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Buffer[0] = EMPTY_VALUE;
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}
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/*
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https://www.mql5.com/en/docs/constants/structures/mqlparam
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*/
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//--- return value of prev_calculated for next call
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return(rates_total);
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}
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void SubscriptionHandler(ZmqMsg &chartMsg){
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CJAVal message;
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//ResetLastError();
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// Get data from reguest
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string msg=chartMsg.getData();
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if(debug) Print("Processing:"+msg);
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// Deserialize msg to CJAVal array
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if(!message.Deserialize(msg)){
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//ActionDoneOrError(65537, __FUNCTION__);
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Alert("Deserialization Error");
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ExpertRemove();
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}
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if(message["indicatorChartId"]==IndicatorId) WriteToBuffer(message);
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}
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void WriteToBuffer(CJAVal &message) {
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int bufferSize = ArraySize(Buffer);
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int messageDataSize = message["data"].Size();
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if(first==false) {
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//ArrayFill(Buffer, 0, ArraySize(Buffer), EMPTY_VALUE);
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PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,bufferSize-messageDataSize);
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first = true;
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}
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for(int i=0;i<messageDataSize;i++){
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// don't add more elements than the automatically sized buffer array can hold
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if(i+1<bufferSize){
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// the first element is the current unformed candle, so we start at index 1
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// we reverse the order of the incoming values, which are expected to be ascending
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Buffer[i+1] = message["data"][messageDataSize-1-i].ToDbl();
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}
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}
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Buffer[0] = EMPTY_VALUE;
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//ArrayResize(Values, bufferSize);
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//for(int i=0;i<bufferSize;i++){
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// Values[i] = Buffer[i];
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// }
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// Print(Buffer[1], " ", Values[1]);
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}
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/*
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TODO:
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display drawing when the last history price arrived, not on first live signal
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buy/sell arrows
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create custom symbols for backtest data
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restore after time frame change. try valuestore again?
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alternative: set Buffer to all EMPTY_VALUE, if not the original TF
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dependable redraw after calling timer
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*/
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void CheckMessages(){
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// Timer() works, when the indicator is manually added to a chart, but not with ChartIndicatorAdd()
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ZmqMsg chartMsg;
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// Recieve chart instructions stream from client via live Chart socket.
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chartLiveSocket.recv(chartMsg,true);
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// Request recived
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if(chartMsg.size()>0){
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// Handle subscription SubscriptionHandler().
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Print(chartMsg.getData());
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SubscriptionHandler(chartMsg);
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ChartRedraw(ChartID());
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}
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}
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void OnChartEvent(const int id,
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const long &lparam,
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const double &dparam,
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const string &sparam)
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{
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//if(id==CHARTEVENT_CUSTOM+222 && sparam==IndicatorId) CheckMessages();
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if(id==CHARTEVENT_CUSTOM+222) CheckMessages();
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}
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//+----------------------------------------------------
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