我在JFreeChart的散点图上有几千个点.
现在的问题是我的程序是用“正方形”绘制点,但是我需要一些帮助,如何将点的形状从“正方形”更改为“点/圆”.
任何帮助将不胜感激. @H_301_4@// *我正在使用ShapeUtilities,但是当我使用XYItemRenderer / XYDotRenderer时,它不会改变指向“DaigonalCross”的形状 – 如果在代码中出现任何错误,请进行任何更正.. * ///

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
import java.util.*;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYDotRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.ShapeUtilities;

public class SPlotfinal extends ApplicationFrame {

    public SPlotfinal(String s) {
        super(s);
        JPanel jpanel = createDemoPanel();
        jpanel.setPreferredSize(new Dimension(500,270));
        setContentPane(jpanel);
    }

    public static JPanel createDemoPanel() {

        JFreeChart jfreechart = ChartFactory.createScatterPlot("Scatter Plot Demo","X","Y",samplexydataset2(),PlotOrientation.VERTICAL,true,false);
        Shape cross = ShapeUtilities.createDiagonalCross(3,1);

        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setBaseShape(cross);
        renderer.setBasePaint(Color.red);
        //changing the Renderer to XYDotRenderer
        //xyPlot.setRenderer(new XYDotRenderer());
        XYDotRenderer xydotrenderer = new XYDotRenderer();
        xyPlot.setRenderer(xydotrenderer);
        xydotrenderer.setSeriesShape(0,cross);

        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);

        return new ChartPanel(jfreechart);
    }

    private static XYDataset samplexydataset2() {
        int cols = 20;
        int rows = 20;
        double[][] values = new double[cols][rows];

        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        Random rand = new Random();
        for (int i = 0; i < values.length; i++) {
            for (int j = 0; j < values[i].length; j++) {
                double x = Math.round(rand.nextDouble() * 500);
                double y = Math.round(rand.nextDouble() * 500);

                series.add(x,y);
            }
        }
        xySeriesCollection.addSeries(series);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        SPlotfinal scatterplotdemo4 = new SPlotfinal("Scatter Plot Demo 4");
        scatterplotdemo4.pack();
        RefineryUtilities.centerFrameOnScreen(scatterplotdemo4);
        scatterplotdemo4.setVisible(true);
    }
}

Shape cross = ShapeUtilities.createDiagonalCross(3,1);
plot = (XYPlot) chart.getPlot();
renderer = plot.getRenderer();
renderer.setSeriesShape(0,cross);

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
import java.util.*;
import javax.swing.JPanel;
import org.jfree.chart.*;
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;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.ShapeUtilities;

public class SPlotfinal extends ApplicationFrame {

    public SPlotfinal(String s) {
        super(s);
        JPanel jpanel = createDemoPanel();
        jpanel.setPreferredSize(new Dimension(640,480));
        add(jpanel);
    }

    public static JPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            "Scatter Plot Demo",1);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setSeriesShape(0,cross);
        renderer.setSeriesPaint(0,Color.red);
        return new ChartPanel(jfreechart);
    }

    private static XYDataset samplexydataset2() {
        int cols = 20;
        int rows = 20;
        double[][] values = new double[cols][rows];
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        Random rand = new Random();
        for (int i = 0; i < values.length; i++) {
            for (int j = 0; j < values[i].length; j++) {
                double x = rand.nextGaussian();
                double y = rand.nextGaussian();
                series.add(x,y);
            }
        }
        xySeriesCollection.addSeries(series);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        SPlotfinal scatterplotdemo4 = new SPlotfinal("Scatter Plot Demo 4");
        scatterplotdemo4.pack();
        RefineryUtilities.centerFrameOnScreen(scatterplotdemo4);
        scatterplotdemo4.setVisible(true);
    }
}