There is no need to use
SwingUtilities.invokeAndWait.
In order to update a label on chart, you can keep a reference to label object in your strategy and update its time and price values. Moreover, if you create a new label with the same key it will replace the existing label.
Here is a strategy that creates and updates a label.
package jforex;
import com.dukascopy.api.*;
import com.dukascopy.api.drawings.IChartObjectFactory;
import com.dukascopy.api.drawings.ILabelChartObject;
import java.awt.Color;
import java.awt.Font;
public class Strategy implements IStrategy {
private IEngine engine;
private IConsole console;
private IHistory history;
private IContext context;
private IIndicators indicators;
private IUserInterface userInterface;
private IChart chart;
@Configurable("Instrument")
private Instrument selectedInstrument = Instrument.EURUSD;
private Period selectedPeriod;
public void onStart(IContext context) throws JFException {
this.engine = context.getEngine();
this.console = context.getConsole();
this.history = context.getHistory();
this.context = context;
this.indicators = context.getIndicators();
this.userInterface = context.getUserInterface();
this.chart = context.getChart(selectedInstrument);
this.selectedPeriod = chart.getSelectedPeriod();
}
public void onAccount(IAccount account) throws JFException {
}
public void onMessage(IMessage message) throws JFException {
}
public void onStop() throws JFException {
}
public void onTick(Instrument instrument, ITick tick) throws JFException {
if(!instrument.equals(selectedInstrument)) {
return;
}
drawLabel(tick.getTime(), tick.getAsk());
}
public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
}
private ILabelChartObject label = null;
private void drawLabel(long time, double price) {
long timeDelta = selectedPeriod.getInterval() / 2;
if(label == null) {
IChartObjectFactory factory = chart.getChartObjectFactory();
label = factory.createLabel("label", time + timeDelta, price);
label.setOpacity(1);
label.setColor(Color.BLUE);
} else {
label.setPrice(0, price);
label.setTime(0, time + timeDelta);
}
label.setText(String.valueOf(price), Font.BOLD);
chart.addToMainChart(label);
}
}
