I have an XYPlot displaying multiple TimeSeries in a TimeSeriesCollection. I'd like to be able to get the list of TimeSeriesDataItems that correspond to a domain crosshair click.
It looks like I can add a PlotChangeListener to be notified of a change in the crosshair value and I can then call XYPlot.getDomainCrosshairValue(), but I can't see how to then use that crosshair value to get the right time series items
I managed to figure it out eventually. I was on the right track originally; add a PlotChangeListener to be notified of a change and then get the crosshair value. Because my domain axis is a DateAxis the value returned as the crosshair value is actually the millisecond value of the date that the crosshair falls on. From that, I can construct a Day instance that can be used to retrieve the TimeSeriesDataItem from each TimeSeries in my TimeSeriesCollection.
plot.addChangeListener(new PlotChangeListener() {
public void plotChanged(PlotChangeEvent event) {
double crosshairXValue = this.plot.getDomainCrosshairValue();
if (crosshairXValue == 0) {
return;
}
Date date = new Date((long) crosshairXValue);
Day day = new Day(date);
for (Iterator<TimeSeries> itr = timeseriesCollection.getSeries().iterator(); itr.hasNext(); ) {
TimeSeries timeSeries = itr.next();
TimeSeriesDataItem dataItem = timeSeries.getDataItem(day);
Number balance = dataItem.getValue();
System.out.println("Balance for day " + day + " is " + balance);
//TODO publish balances to listeners
}
}
});
Then you also have to add a MouseClickListener to the ChartPanel so that you can delegate clicks to the chart. Otherwise your plot change listener will never be invoked.
chartPanel.addChartMouseListener(new ChartMouseListener() {
public void chartMouseMoved(ChartMouseEvent event) {
// Do nothing
}
public void chartMouseClicked(ChartMouseEvent event) {
int x = event.getTrigger().getX();
int y = event.getTrigger().getY();
chart.handleClick(x, y, chartPanel.getChartRenderingInfo());
}
});