Question

我想在javafx中声明一个折线图并截取屏幕截图。添加数据，数据系列和xAxis和yAxis后，它将传递给屏幕截图方法。尝试调用该方法时会发生此异常。

        CategoryAxis monthAxis = new CategoryAxis();
        monthAxis.setLabel("Month");
        NumberAxis profitAxis = new NumberAxis();
        profitAxis.setLabel("Profit");

        String[] monthName = {"January", "February", "March", "April", "May", "June", "July",
        "August", "September", "October", "November", "December"};

        LineChart profitLineChart = new LineChart(monthAxis, profitAxis);
        XYChart.Series series1 = new XYChart.Series();

        int[] profitValues = new int[monthlyRecords.size()];
        int[] monthNo = new int[monthlyRecords.size()];

        for (int i = 0; i < monthlyRecords.size(); i++) {

            profitValues[i] = Integer.parseInt(monthlyRecords.get(i).getProfit());
            monthNo[i] = Integer.parseInt(monthlyRecords.get(i).getMonth());
            series1.getData().add(new XYChart.Data(monthName[monthNo[i]-1], profitValues[i]));
        }

        profitLineChart.getData().addAll(series1);
        saveProfitLineChartToFile(monthAxis,profitAxis,series1.getData(), "profitLineChart.png");

正在调用的方法：

   public static void saveProfitLineChartToFile(CategoryAxis monthAxis, NumberAxis profitAxis,ObservableList<LineChart.Data> lineChartData, String path) throws IOException {

    LineChart lineChart = new LineChart(monthAxis,profitAxis,lineChartData);
    Scene sceneForChart = new Scene(lineChart, 800, 600);
    WritableImage image = lineChart.snapshot(new SnapshotParameters(), null);
    File file = new File(path);
    try {
        ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", file);
    } catch (IOException e) {
        e.printStackTrace();
    }

}

发生的异常：

javafx.scene.chart.XYChart$Data cannot be cast to javafx.scene.chart.XYChart$Series

Answer 1

应该称为：

saveProfitLineChartToFile(monthAxis,profitAxis,profitLineCha‌rt.getData(), "profitLineChart.png");

当调用方法传递可观察列表时，会发生Javafx异常

1 个答案: