如何为域和范围轴JFreeChart设置相同的比例

我想创build类似于极点/零点图的极点/零点图 。 它是显示IIR和FIR滤波器的性能，如稳定性，types…

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绘制图表。

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, 10.0f, dash1, 0.0f), Color.black); plot.addAnnotation(unitCircle); plot.setBackgroundPaint(Color.white); chart.setAntiAlias(true); chartPanel = new JPanel(new BorderLayout()); ChartPanel cp = new ChartPanel(chart); cp.setMouseWheelEnabled(true); cp.setToolTipText("test"); cp.setDisplayToolTips(true); chartPanel.add(cp); 

Answer 1

Sans legend ，设置ChartPanel的首选大小工作得很好：

 private static final int SIZE = 456; chartPanel.setPreferredSize(new Dimension(SIZE, SIZE)); 

 import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.geom.Ellipse2D; 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.annotations.XYShapeAnnotation; 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/8048652 * @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 int SIZE = 456; 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(); chartPanel.setPreferredSize(new Dimension(SIZE, SIZE)); 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.nextGaussian(), rand.nextGaussian()); } } })); this.add(control, BorderLayout.SOUTH); } private ChartPanel createDemoPanel() { JFreeChart jfreechart = ChartFactory.createScatterPlot( title, "X", "Y", createSampleData(), PlotOrientation.VERTICAL, false, true, false); XYPlot xyPlot = (XYPlot) jfreechart.getPlot(); xyPlot.setDomainCrosshairVisible(true); xyPlot.setRangeCrosshairVisible(true); XYItemRenderer renderer = xyPlot.getRenderer(); renderer.setSeriesPaint(0, Color.blue); adjustAxis((NumberAxis) xyPlot.getDomainAxis(), true); adjustAxis((NumberAxis) xyPlot.getRangeAxis(), false); XYShapeAnnotation unitCircle = new XYShapeAnnotation( new Ellipse2D.Double(-1, -1, 2, 2), new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f), Color.black); xyPlot.addAnnotation(unitCircle); xyPlot.setBackgroundPaint(Color.white); return new ChartPanel(jfreechart); } private void adjustAxis(NumberAxis axis, boolean vertical) { axis.setRange(-1.0, 1.0); axis.setTickUnit(new NumberTickUnit(0.5)); axis.setVerticalTickLabels(vertical); } private XYDataset createSampleData() { XYSeriesCollection xySeriesCollection = new XYSeriesCollection(); XYSeries series = new XYSeries("Random"); for (int i = 0; i < N * N; i++) { series.add(rand.nextGaussian(), rand.nextGaussian()); } 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); } }); } }