如何从折线图更改为条形图

Question

我有这个折线图，想把它变成条形图，但我是 Java 的新手，不知道是否可行，因为 x 轴是 TimeSeries。这是我的可视化折线图的代码：

public class Time {

private static Time INSTANCE;
public static boolean isInitialized = false;

private Marker marker;
private Long markerStart;
private Long markerEnd;

private XYPlot plot;

long last_lowerBound;
long last_upperBound;

@Inject
public Time() {

}

Composite comp;
TimeSeriesCollection dataset;
ChartPanel panel;
JFreeChart chart;
protected Point endPoint;

@PostConstruct
public void postConstruct(Composite parent) {
    comp = new Composite(parent, SWT.NONE | SWT.EMBEDDED);
    Frame frame = SWT_AWT.new_Frame(comp);

    JApplet rootContainer = new JApplet();

    TimeSeries series = new TimeSeries("Timeline");
    dataset = new TimeSeriesCollection();

    String plotTitle = "";
    String xaxis = "Time";
    String yaxis = "Docs";
    PlotOrientation orientation = PlotOrientation.VERTICAL;
    boolean show = false;
    boolean toolTips = true;
    boolean urls = false;

    chart = ChartFactory.createTimeSeriesChart(plotTitle, xaxis, yaxis, dataset, show, toolTips, urls );

    // get a reference to the plot for further customisation...
    plot = chart.getXYPlot();
    plot.setBackgroundPaint(Color.white);
    plot.setDomainGridlinePaint(Color.gray);
    plot.setRangeGridlinePaint(Color.gray);
    plot.setOutlinePaint(Color.white);
    plot.getRangeAxis().setLabel("");
    plot.getDomainAxis().setLabel("");
    ValueAxis y_axis = plot.getRangeAxis();     // Y
    ValueAxis x_axis = plot.getDomainAxis();    // X
    Font font = new Font("Veranda", Font.PLAIN, 12);
    y_axis.setTickLabelFont(font);
    x_axis.setTickLabelFont(font);
    x_axis.setTickLabelPaint(Color.black);
    y_axis.setTickLabelPaint(Color.black);
    plot.getDomainAxis().setAxisLineVisible(false);

    final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
    // renderer.setSeriesLinesVisible(0, false);
    renderer.setSeriesShapesVisible(0, false);
    plot.setRenderer(renderer);

我应该只更新这一行：chart = ChartFactory.createTimeSeriesChart(plotTitle, xaxis, yaxis, dataset, show, toolTips, urls ); 还是我应该完全改变它？

我试过像这样更改这部分，但它没有显示任何内容：

dataset = new TimeSeriesCollection();

    String plotTitle = "";
    String xaxis = "Time";
    String yaxis = "Docs";
    PlotOrientation orientation = PlotOrientation.VERTICAL;
    boolean show = false;
    boolean toolTips = true;
    boolean urls = false;

    chart = ChartFactory.createBarChart(plotTitle, xaxis, yaxis, (CategoryDataset) dataset, orientation, show, toolTips, urls);


    chart.setBackgroundPaint(null);
    chart.setBackgroundImageAlpha(0.0f);

    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    plot.setRangeGridlinesVisible(false);
    plot.setDomainGridlinesVisible(false);
    plot.setOutlineVisible(false);
    plot.setRangeZeroBaselineVisible(false);
    plot.setDomainGridlinesVisible(false);
    plot.setBackgroundPaint(COLOR_INVISIBLE);
    plot.setBackgroundImageAlpha(0.0f);

    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setSeriesPaint(0, AttributeGuiTools.getColorForValueType(Ontology.NOMINAL));
    renderer.setBarPainter(new StandardBarPainter());
    renderer.setDrawBarOutline(true);
    renderer.setShadowVisible(false); } }

非常感谢任何帮助！

Answer 1

给出一个合适的XYDataset, such as IntervalXYDataset, you can replace ChartFactory.createTimeSeriesChart() with ChartFactory.createXYBarChart()，其中提供了一个可选的DateAxis。下面的示例使用相同的数据集创建两个图表。

IntervalXYDataset dataset = createDataset();
f.add(createPanel(ChartFactory.createXYBarChart("Data", "Time", true, "Value", dataset)));
f.add(createPanel(ChartFactory.createTimeSeriesChart("Data", "Time", "Value", dataset)));

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickMarkPosition;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.axis.DateTickUnitType;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.Year;
import org.jfree.data.xy.IntervalXYDataset;

/**
 * @see 
 * @see 
 */
public class Test {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Test()::display);
    }

    private void display() {
        JFrame f = new JFrame("Data");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(new GridLayout(0, 1));
        IntervalXYDataset dataset = createDataset();
        f.add(createPanel(ChartFactory.createXYBarChart("Data", "Time", true, "Value", dataset)));
        f.add(createPanel(ChartFactory.createTimeSeriesChart("Data", "Time", "Value", dataset)));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private ChartPanel createPanel(JFreeChart chart) {
        final XYPlot plot = chart.getXYPlot();
        final DateAxis domainAxis = (DateAxis) plot.getDomainAxis();
        domainAxis.setTickUnit(new DateTickUnit(DateTickUnitType.YEAR, 1));
        domainAxis.setTickMarkPosition(DateTickMarkPosition.MIDDLE);
        domainAxis.setDateFormatOverride(new SimpleDateFormat("yyyy"));
        return new ChartPanel(chart) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(500, 250);
            }
        };
    }

    private IntervalXYDataset createDataset() {
        TimeSeries series = new TimeSeries("Value");
        Calendar c = Calendar.getInstance();
        for (int i = 0; i < 7; i++) {
            series.add(new Year(c.getTime()), i + 1);
            c.add(Calendar.YEAR, 1);
        }
        return new TimeSeriesCollection(series);
    }
}

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