設置X，Y軸-JfreeChart的范圍

Question

有關如何為X軸和Y軸設置范圍的任何建議。

我的“X軸”范圍是“0.00到1.00”，相差“0.05”。 我的意思是0.00 0.05 0.10 0.15 ..... 0.90 0.95 1.00

我的“Y軸”范圍從“0.0到1.0”，差異為“0.1”。 我的意思是0.0 0.1 0.2 0.3 0.4 ......... 0.9 1.0

我嘗試過這樣做，但它沒有反映在圖表上; 我不知道如何將它應用於ChartFactory.createScatterPlot() 。

final NumberAxis domainAxis = new NumberAxis("X-Axis");
domainAxis.setRange(0.00,1.00);
domainAxis.setTickUnit(new NumberTickUnit(0.1));
final NumberAxis rangeAxis = new NumberAxis("Y-Axis");
rangeAxis.setRange(0.0,1.0);
rangeAxis.setTickUnit(new NumberTickUnit(0.05));

public  JPanel createDemoPanel() {
    XYDataset dataset1 = samplexydataset2();
    JFreeChart jfreechart = ChartFactory.createScatterPlot("Scatter Plot Demo",
        "X", "Y",dataset1, PlotOrientation.VERTICAL, true, true, false);
}

對此有任何幫助都會很棒。

Answer 1

我猜你的新的NumberAxis實例沒有被劇情使用; 使用工廠現有的可能更容易。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.*;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * @see http://stackoverflow.com/questions/7231824
 * @see http://stackoverflow.com/questions/7205742
 * @see http://stackoverflow.com/questions/7208657
 * @see http://stackoverflow.com/questions/7071057
 */
public class ScatterAdd extends JFrame {

    private static final int N = 8;
    private static final String title = "Scatter Add Demo";
    private static final Random rand = new Random();
    private XYSeries added = new XYSeries("Added");

    public ScatterAdd(String s) {
        super(s);
        final ChartPanel chartPanel = createDemoPanel();
        this.add(chartPanel, BorderLayout.CENTER);
        JPanel control = new JPanel();
        control.add(new JButton(new AbstractAction("Add") {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (int i = 0; i < N; i++) {
                    added.add(rand.nextDouble(), rand.nextDouble());
                }
            }
        }));
        this.add(control, BorderLayout.SOUTH);
    }

    private ChartPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            title, "X", "Y", createSampleData(),
            PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setSeriesPaint(0, Color.blue);
        NumberAxis domain = (NumberAxis) xyPlot.getDomainAxis();
        domain.setRange(0.00, 1.00);
        domain.setTickUnit(new NumberTickUnit(0.1));
        domain.setVerticalTickLabels(true);
        NumberAxis range = (NumberAxis) xyPlot.getRangeAxis();
        range.setRange(0.0, 1.0);
        range.setTickUnit(new NumberTickUnit(0.1));
        return new ChartPanel(jfreechart);
    }

    private XYDataset createSampleData() {
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        for (int i = 0; i < N * N; i++) {
            double x = rand.nextDouble();
            double y = rand.nextDouble();
            series.add(x, y);
        }
        xySeriesCollection.addSeries(series);
        xySeriesCollection.addSeries(added);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ScatterAdd demo = new ScatterAdd(title);
                demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                demo.pack();
                demo.setLocationRelativeTo(null);
                demo.setVisible(true);
            }
        });
    }
}

Answer 2

除非您粘貼的代碼不完整，否則您的問題似乎是您沒有將您創建的NumberAxis對象與繪圖相關聯。

不要手動創建新的NumberAxis對象，而是嘗試獲取與繪圖關聯的默認ValueAxis對象，然后修改它們的屬性：

XYPlot xyPlot = jfreechart.getXYPlot();
ValueAxis domainAxis = xyPlot.getDomainAxis();
ValueAxis rangeAxis = xyPlot.getRangeAxis();

domainAxis.setRange(0.0, 1.0);
domainAxis.setTickUnit(new NumberTickUnit(0.1));
rangeAxis.setRange(0.0, 1.0);
rangeAxis.setTickUnit(new NumberTickUnit(0.05));