java - 如何使用 JFreeChart 将数组中的数据绘制成图表？

Question

我需要绘制一个图表，以便在x轴上有“i”数据，在y轴上有“massAngle [i]”数据。我尝试这样做:

for (int i = 0; i < massAngle.length; i++) {
    XYSeries series = new XYSeries("1");
    series.add(i, massAngle[i]);

    XYSeriesCollection seriesCollection = new XYSeriesCollection(series);
    final JFreeChart chart = ChartFactory.createXYLineChart("Долгота и Широта",
            "Долгота", "Широта", seriesCollection, PlotOrientation.VERTICAL, true, true, false);

    final ChartPanel chartPanel = new ChartPanel(chart);
    chartPanel.setPreferredSize(new Dimension(1150, 470));
    panel.add(chartPanel);
}

Answer 1

您正在为数组的每个元素创建一个新的XYSeriesCollection、一个新的JFChart和一个新的ChartPanel ，您必须执行一次:创建一个 XYSeries 添加所有数据并构建一个图表:

XYSeries series = new XYSeries("1");
for (int i = 0; i < massAngle.length; i++) {
    series.add(i, massAngle[i]);
}

XYSeriesCollection seriesCollection = new XYSeriesCollection(series);
final JFreeChart chart = ChartFactory.createXYLineChart("Долгота и Широта", "Долгота", 
                 "Широта", seriesCollection, PlotOrientation.VERTICAL, true, true, false);

final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new Dimension(1150, 470));
panel.add(chartPanel);