相关疑难解决方法(0)

我在JFreeChart散点图上绘制了数千个点.现在的问题是我的程序正在用"正方形"绘制点,但我需要一些帮助来解决如何将Shape点从"正方形"更改为"点/圆"的问题.任何帮助,将不胜感激.

// *我正在使用ShapeUtilities,但是当我使用XYItemRenderer/XYDotRenderer时,它没有改变指向"DaigonalCross"的形状 - 如果代码中有任何错误,请更正.* ///

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, …

我想创建类似极点/零点的极点/零点图.它用于显示IIR和FIR滤波器属性,如稳定性,类型......

我的问题是:如何为两个轴设置相同的比例(不是范围)？
我使用ScatterPlot作为图表.

JFreeChart chart = ChartFactory.createScatterPlot("Pole/zero plot", // chart
                                                                        // title
            "real", // x axis label
            "imaginary", // y axis label
            result, // data
            PlotOrientation.VERTICAL, true, // include legend
            true, // tooltips
            false // urls
            );

XYPlot plot = (XYPlot) chart.getPlot();
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinesVisible(true);
plot.setRangeGridlinePaint(Color.black);
plot.setDomainGridlinePaint(Color.black);

XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer();

renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelsVisible(true, true);


plot.setDomainCrosshairVisible(true);
plot.setDomainCrosshairLockedOnData(true);
plot.setRangeCrosshairVisible(true);
plot.setRangeCrosshairLockedOnData(true);

float dash1[] = { 10.0f };
XYShapeAnnotation unitCircle = new XYShapeAnnotation(
    new Ellipse2D.Double(-1, -1, 2, 2), new BasicStroke(1.0f,
    BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, …