For Zoomer, how to get actual starting index and end index of data in the range? For example, start and end index of a list of bars.

[yezhengli-Mr9]

For Zoomer, how to get actual starting index and end index of data in the range? For example, start and end index of a list of bars.

The goal is, when zoom in, there are sync-up charts showing only chart for the data within the zoom range.

chart-fx/chartfx-samples/src/main/java/io/fair_acc/sample/financial/AbstractBasicFinancialApplication.java

Lines 189 to 245 in f8a5094

	protected Chart getDefaultFinancialTestChart(final FinancialTheme theme) {
	// load datasets
	DefaultDataSet indiSet = null;
	if (resource.startsWith("REALTIME")) {
	try {
	Interval<Calendar> timeRangeInt = CalendarUtils.createByDateTimeInterval(timeRange);
	Interval<Calendar> ttInt = CalendarUtils.createByTimeInterval(tt);
	Calendar replayFromCal = CalendarUtils.createByDateTime(replayFrom);
	ohlcvDataSet = new SimpleOhlcvReplayDataSet(
	DataInput.valueOf(resource.substring("REALTIME-".length())),
	period,
	timeRangeInt,
	ttInt,
	replayFromCal,
	consolidationAddons);
	} catch (ParseException e) {
	throw new IllegalArgumentException(e.getMessage(), e);
	}
	} else {
	ohlcvDataSet = new OhlcvDataSet(resource);
	indiSet = new DefaultDataSet("MA(24)");
	try {
	loadTestData(resource, ohlcvDataSet, indiSet);
	} catch (IOException e) {
	throw new IllegalArgumentException(e.getMessage(), e);
	}
	}
	// prepare axis
	final DefaultNumericAxis xAxis1 = new DefaultNumericAxis("time", "iso");
	xAxis1.setOverlapPolicy(AxisLabelOverlapPolicy.SKIP_ALT);
	xAxis1.setAutoRangeRounding(false);
	xAxis1.setTimeAxis(true);
	// set localised time offset
	if (xAxis1.isTimeAxis() && xAxis1.getAxisLabelFormatter() instanceof DefaultTimeFormatter) {
	final DefaultTimeFormatter axisFormatter = (DefaultTimeFormatter) xAxis1.getAxisLabelFormatter();
	axisFormatter.setTimeZoneOffset(ZoneOffset.ofHoursMinutes(2, 0));
	}
	// category axis support tests
	// final CategoryAxis xAxis = new CategoryAxis("time [iso]");
	// xAxis.setTickLabelRotation(90);
	// xAxis.setOverlapPolicy(AxisLabelOverlapPolicy.SKIP_ALT);
	final DefaultNumericAxis yAxis1 = new DefaultNumericAxis("price", "points");
	// prepare chart structure
	final XYChart chart = new XYChart(xAxis1, yAxis1);
	chart.setTitle(theme.name());
	chart.setLegendVisible(true);
	chart.setPrefSize(prefChartWidth, prefChartHeight);
	// set them false to make the plot faster
	chart.setAnimated(false);
	// prepare plugins
	chart.getPlugins().add(new Zoomer(AxisMode.X));

[yezhengli-Mr9]

Has own solution with objects of several classes unsuitably referring to others.