JFreeChart – 自定义RingChart

我想制作两个如下所示的环形图：

但是RingPlot似乎不是很容易定制的。 我能想到的最好的是：

有没有机会用JFreeChart做我想做的事？

Answer 1

JFreeChart可以做大多数事情，这应该让你开始（我可能会将中心文本function合并到即将发布的1.0.18版本中，以便不需要子类化）：

package org.jfree.chart.demo; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.GradientPaint; import java.awt.Graphics2D; import java.awt.Point; import java.awt.geom.Rectangle2D; import javax.swing.JPanel; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PiePlotState; import org.jfree.chart.plot.RingPlot; import org.jfree.chart.title.TextTitle; import org.jfree.data.general.DefaultPieDataset; import org.jfree.data.general.PieDataset; import org.jfree.text.TextUtilities; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.HorizontalAlignment; import org.jfree.ui.RectangleInsets; import org.jfree.ui.RefineryUtilities; import org.jfree.ui.TextAnchor; /** * A simple demonstration application showing how to create a ring chart using * data from a {@link DefaultPieDataset}. */ public class RingChartDemo1 extends ApplicationFrame { private static final long serialVersionUID = 1L; static class CustomRingPlot extends RingPlot { private Font centerTextFont; private Color centerTextColor; public CustomRingPlot(PieDataset dataset) { super(dataset); this.centerTextFont = new Font(Font.SANS_SERIF, Font.BOLD, 24); this.centerTextColor = Color.LIGHT_GRAY; } @Override protected void drawItem(Graphics2D g2, int section, Rectangle2D dataArea, PiePlotState state, int currentPass) { super.drawItem(g2, section, dataArea, state, currentPass); if (currentPass == 1 && section == 0) { Number n = this.getDataset().getValue(section); g2.setFont(this.centerTextFont); g2.setPaint(this.centerTextColor); TextUtilities.drawAlignedString(n.toString(), g2, (float) dataArea.getCenterX(), (float) dataArea.getCenterY(), TextAnchor.CENTER); } } } /** * Default constructor. * * @param title the frame title. */ public RingChartDemo1(String title) { super(title); setContentPane(createDemoPanel()); } /** * Creates a sample dataset. * * @return A sample dataset. */ private static PieDataset createDataset() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("A", new Double(210)); dataset.setValue("B", new Double(150)); return dataset; } /** * Creates a chart. * * @param dataset the dataset. * * @return A chart. */ private static JFreeChart createChart(PieDataset dataset) { CustomRingPlot plot = new CustomRingPlot(dataset); JFreeChart chart = new JFreeChart("Custom Ring Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, false); chart.setBackgroundPaint(new GradientPaint(new Point(0, 0), new Color(20, 20, 20), new Point(400, 200), Color.DARK_GRAY)); // customise the title position and font TextTitle t = chart.getTitle(); t.setHorizontalAlignment(HorizontalAlignment.LEFT); t.setPaint(new Color(240, 240, 240)); t.setFont(new Font("Arial", Font.BOLD, 26)); plot.setBackgroundPaint(null); plot.setOutlineVisible(false); plot.setLabelGenerator(null); plot.setSectionPaint("A", Color.ORANGE); plot.setSectionPaint("B", new Color(100, 100, 100)); plot.setSectionDepth(0.05); plot.setSectionOutlinesVisible(false); plot.setShadowPaint(null); return chart; } /** * Creates a panel for the demo (used by SuperDemo.java). * * @return A panel. */ public static JPanel createDemoPanel() { JFreeChart chart = createChart(createDataset()); chart.setPadding(new RectangleInsets(4, 8, 2, 2)); ChartPanel panel = new ChartPanel(chart); panel.setMouseWheelEnabled(true); panel.setPreferredSize(new Dimension(600, 300)); return panel; } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(String[] args) { RingChartDemo1 demo = new RingChartDemo1("JFreeChart: Ring Chart Demo 1"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }