Can't make DataPointTooltip work with the samples

[sergiofdezperea]

Hello,

I'm trying to migrate an application from java swing to javafx. This library looks perfect to replace jfreechart.

I was playing with the plugins and i can't make work DataPointTooltip using SimpleChartSample, when i check the render getAxes it returns an empty array.

In FXSampler it doesn’t work either for me.

Can you give me advise?

[wirew0rm]

Hey, thanks for reporting, this seems to have been broken on the 11.3 major release, where the semantic on the renderer.getAxes() list changed slightly from always returning the used axes to only holding the axes explicitly set by the user.

As a quick workaround you can explicitly set the renderer axes to the ones defined in the chart:

renderer.getAxes().addAll(chart.getAxes()); // explicitly set renderer axes until Tooltip Plugin is fixed

This should work for all simple charts that only use a single renderer and get you started while we'll try to figure out how this should best be fixed. Ultimately the plugin should use the same logic that is used by the renderer, but currently these methods are at least partially defined in the individual implementations and not exposed through the interface, so we will probably have to pull them up.

[sergiofdezperea]

Thanks for the explanation and workaround.

[yezhengli-Mr9]

Curious about the effect (any demo) for new DataPointTooltip(...) described in #431?
Dot not feel any findNearestDataPointWithinPickingDistance(...) provides substantial nearest DataPoint (version 11.2.5, 11.3.0, etc.) #639

chart-fx/chartfx-chart/src/main/java/de/gsi/chart/plugins/DataPointTooltip.java

Lines 102 to 115 in cd202c7

	private Optional<DataPoint> findNearestDataPointWithinPickingDistance(final Point2D mouseLocation) {
	final Chart chart = getChart();
	if (!(chart instanceof XYChart)) {
	return Optional.empty();
	}
	final XYChart xyChart = (XYChart) chart;
	final ObservableList<DataSet> xyChartDatasets = xyChart.getDatasets();
	return xyChart.getRenderers().stream() // for all renderers
	.flatMap(renderer -> Stream.of(renderer.getDatasets(), xyChartDatasets) //
	.flatMap(List::stream) // combine global and renderer specific Datasets
	.flatMap(dataset -> getPointsCloseToCursor(dataset, renderer, mouseLocation))) // get points in range of cursor
	.reduce((p1, p2) -> p1.distanceFromMouse < p2.distanceFromMouse ? p1 : p2); // find closest point
	}

chart-fx/chartfx-chart/src/main/java/io/fair_acc/chartfx/plugins/DataPointTooltip.java

Lines 103 to 116 in ed86318

	protected Optional<DataPoint> findNearestDataPointWithinPickingDistance(final Point2D mouseLocation) {
	final Chart chart = getChart();
	if (!(chart instanceof XYChart)) {
	return Optional.empty();
	}
	final XYChart xyChart = (XYChart) chart;
	final ObservableList<DataSet> xyChartDatasets = xyChart.getDatasets();
	return xyChart.getRenderers().stream() // for all renderers
	.flatMap(renderer -> Stream.of(renderer.getDatasets(), xyChartDatasets) //
	.flatMap(List::stream) // combine global and renderer specific Datasets
	.flatMap(dataset -> getPointsCloseToCursor(dataset, renderer, mouseLocation))) // get points in range of cursor
	.reduce((p1, p2) -> p1.distanceFromMouse <= p2.distanceFromMouse ? p1 : p2); // find closest point, tie-breaking in favor of earlier data sets to match rendering order
	}

Can see hover effect then.