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JavaFXのLineChartでクリックしたところのx座標を取ってくる

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環境

  • Java SE 8u20

コード一部抜粋

...
TakeXYAction action = new TakeXYAction(chart);
chart.lookup(".chart-plot-background").setOnMouseClicked(action);
...
TakeXYAction.java
final class TakeXYAction implements EventHandler<MouseEvent> {
    private final LineChart<Number, Number> chart;
    public TakeXYAction(LineChart<Number, Number> _chart) {
        this.chart = _chart;
    }

    @Override
    public void handle(MouseEvent event) {
        Axis<Number> xAxis  = this.chart.getXAxis();
        double       x      = xAxis.getValueForDisplay(event.getX()).doubleValue();
...
    }
}

要点

  • Chartに対してsetOnMouseClicked(action)をしない
  • lookup(".chart-plot-bakground")でとってこれるNode(Region)に対してsetOnMouseClicked(action)をする
  • event.getX()をAxis#getValueForDisplayに突っ込んでとる
kanpe777
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