Apart from chart object operations, JForex-API also contains methods for doing chart-related actions, namely:

• open and close chart,
• retrieve chart's feed properties,
• retrieve chart drawable coordinates,
• save chart as an image,
• add mouse listener.

Open/Close chart

private IChart chart;

@Override
public void onStart(IContext context) throws JFException {  
    this.context = context;      
    IFeedDescriptor feedDescriptor = 
        new TimePeriodAggregationFeedDescriptor(Instrument.EURUSD, Period.TEN_SECS, OfferSide.BID);
    chart = context.openChart(feedDescriptor); 
}

@Override
public void onStop() throws JFException {
    context.closeChart(chart);
}

ChartOperations.java

Retrieve feed properties

private IChart chart;
private IConsole console;
@Override
public void onStart(IContext context) throws JFException {  
    this.console = context.getConsole();
    chart = context.getChart(Instrument.EURUSD);

    console.getOut().println("Chart's feed: " + chart.getFeedDescriptor()); //will print all feed's parameters
    console.getOut().println("Chart's instrument: " + 
        chart.getFeedDescriptor().getInstrument()); //retrieve a specific feed parameter    
}

Please note that chart has to be in Local mode, if you want to use context.getChart successfully. If he chart is in JCloud mode (by default), the strategy will not be able to find that chart. 

Read more about Local and JCloud mode here.

ChartOperations.java

Retrieve drawable coordinates

private IChart chart;
private IConsole console;
@Override
public void onStart(IContext context) throws JFException {
    this.console = context.getConsole();
    chart = context.getChart(Instrument.EURUSD);
    print("Chart drawable coordinates: min(%s,%.5f); max(%s,%.5f)",
            DateUtils.format(chart.getMinTime()), chart.getMinPrice(),
            DateUtils.format(chart.getMaxTime()), chart.getMaxPrice()
    );
}
private void print(String message, Object... args){
    print(String.format(message,args));
}

ChartOperations.java

Save as image

private IChart chart;
private IConsole console;
@Override
public void onStart(IContext context) throws JFException {
    this.console = context.getConsole();
    chart = context.getChart(Instrument.EURUSD);
    try {
        File file = new File(context.getFilesDir().getPath() + File.separator + "ChartImage.png");
        ImageIO.write(chart.getImage(), "png", file);
        print("chart image saved in: " + file.getAbsolutePath());
    } catch (Exception e) {
        e.printStackTrace(console.getErr());
    }
}

ChartOperations.java

Add mouse listener

One can add a mouse listener to a IChartPanel by calling the IChartPanel.addMouseListener method. Object IChartPanelMouseEvent contains price-time coordinates and other event properties from the event's source. Events source can be accessed by IChartPanelMouseEvent.getSourceEvent() method.

Note: Available with JForex-API 2.7.8.

private IConsole console;
private IChart chart;
private IChartPanelMouseListener listener;

@Override
public void onStart(IContext context) throws JFException {
    console = context.getConsole();
    chart = context.getChart(Instrument.EURUSD);
    if(chart == null){
        console.getErr().println("No chart opened for EURUSD!");
        context.stop();
    }
    chart.addMouseListener(false, listener = new IChartPanelMouseListener(){
        public void mouseClicked(IChartPanelMouseEvent e) { print(e, "mouse Clicked");}
        public void mousePressed(IChartPanelMouseEvent e) { print(e, "mouse Pressed");}
        public void mouseReleased(IChartPanelMouseEvent e) { print(e, "mouse Released");}
        public void mouseEntered(IChartPanelMouseEvent e) { print(e, "mouse Entered");}
        public void mouseExited(IChartPanelMouseEvent e) { print(e, "mouse Exited");}
        public void mouseDragged(IChartPanelMouseEvent e) { print(e, "mouse Dragged");}
        public void mouseMoved(IChartPanelMouseEvent e) { print(e, "mouse Moved");}
    });

}

private void print(IChartPanelMouseEvent e, String comment){
    // call e.getPrice and e.getTime instead of e.toString
    // if you wish to customize the logging formatting or make use of the values
    console.getOut().println(String.format("%s %s x=%s y=%s",
        comment, e.toString(), e.getSourceEvent().getXOnScreen(), e.getSourceEvent().getYOnScreen()));
}

@Override
public void onStop() throws JFException {
    chart.removeMouseListener(listener);
}

MouseListenerStrat.java