三维柱状图(1)

最新推荐文章于 2025-02-11 17:22:30 发布

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最新推荐文章于 2025-02-11 17:22:30 发布

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文章标签： import jfreechart dataset string

本文展示了一个使用JFreeChart库创建的3D柱状图表示例应用，该应用包括了如何设置数据集、配置图表样式及显示效果等关键步骤。

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import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
* This demonstration shows a 3D bar chart with item labels displayed.
*
*/
public class BarChart3DDemo3 extends ApplicationFrame {

    /**
     * Creates a new demo.
     *
     * @param title  the frame title.
     */
    public BarChart3DDemo3(final String title) {

        super(title);
        final CategoryDataset dataset = createDataset();
        final JFreeChart chart = createChart(dataset);
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);

    }

    // ****************************************************************************
    // * JFREECHART DEVELOPER GUIDE                                               *
    // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
    // * to purchase from Object Refinery Limited:                                *
    // *                                                                          *
    // * http://www.object-refinery.com/jfreechart/guide.html                     *
    // *                                                                          *
    // * Sales are used to provide funding for the JFreeChart project - please    *
    // * support us so that we can continue developing free software.             *
    // ****************************************************************************
    /**
     * Creates a sample dataset.
     *
     * @return a sample dataset.
     */
   private CategoryDataset createDataset() {        final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(25.0, "Series 1", "Category 1");
        dataset.addValue(34.0, "Series 1", "Category 2");
        dataset.addValue(19.0, "Series 2", "Category 1");
        dataset.addValue(29.0, "Series 2", "Category 2");
        dataset.addValue(41.0, "Series 3", "Category 1");
        dataset.addValue(33.0, "Series 3", "Category 2");
        return dataset;

    }
    /**
     * Creates a chart.
     *
     * @param dataset  the dataset.
     *
     * @return The chart.
     */
    private JFreeChart createChart(final CategoryDataset dataset) {
        final JFreeChart chart = ChartFactory.createBarChart3D(
            "3D Bar Chart Demo",      // chart title
            "Category",               // domain axis label
            "Value",                  // range axis label
            dataset,                  // data
            PlotOrientation.VERTICAL, // orientation
            true,                     // include legend
            true,                     // tooltips
            false                     // urls
        );

        final CategoryPlot plot = chart.getCategoryPlot();
        final CategoryAxis axis = plot.getDomainAxis();
        axis.setCategoryLabelPositions(
            CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 8.0)
        );
        final CategoryItemRenderer renderer = plot.getRenderer();
        renderer.setItemLabelsVisible(true);
        final BarRenderer r = (BarRenderer) renderer;
        r.setMaxBarWidth(0.05);
        return chart;

    }
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {

        final BarChart3DDemo3 demo = new BarChart3DDemo3("3D Bar Chart Demo 3");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);     demo.setVisible(true);

    }

}