Stacked条形图的itemMargin属性的最大值和最小值是多少

时间：2013-06-26 13:01:30

标签： java swing jfreechart

我正在使用jFreeChart在X轴上绘制堆积条形图。但是我有这个要求来控制X轴上两个堆栈条之间的空间，类似于Micorsoft excel的间隙宽度。 我刚刚附上了一个示例代码来演示这个问题。在滑动条形图上调整间隙宽度。以下是示例代码。

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.SubCategoryAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.GroupedStackedBarRenderer;
import org.jfree.data.KeyToGroupMap;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class DomainTranslateDemo extends ApplicationFrame {

    private static class DemoPanel extends JPanel implements ChangeListener {

        private static int SLIDER_INITIAL_VALUE = 50;
        private JSlider slider;
        private DateAxis domainAxis;
        private int lastValue = SLIDER_INITIAL_VALUE;
        private GroupedStackedBarRenderer renderer;

        // one month (milliseconds, seconds, minutes, hours, days)
        private int delta = 1000 * 60 * 60 * 24 * 30;

        public DemoPanel() {
            super(new BorderLayout());
            final CategoryDataset dataset = createDataset();
            final JFreeChart chart = createChart(dataset);
            final ChartPanel chartPanel = new ChartPanel(chart);
            Dimension Dim = new Dimension(590, 350);
            chartPanel.setPreferredSize(Dim);
            add(chartPanel);

            JPanel dashboard = new JPanel(new BorderLayout());
            dashboard.setBorder(BorderFactory.createEmptyBorder(0, 4, 4, 4));   

            this.slider = new JSlider(0, 100, SLIDER_INITIAL_VALUE);
            this.slider.addChangeListener(this);
            dashboard.add(this.slider);
            add(dashboard, BorderLayout.SOUTH);
        }

        private CategoryDataset createDataset() {
            DefaultCategoryDataset result = new DefaultCategoryDataset();

            result.addValue(20.3, "Product 1 (US)", "Jan 04");


            result.addValue(23.3, "Product 2 (US)", "Jan 04");

            result.addValue(12.7, "Product 2 (Europe)", "Jan 04");


            result.addValue(11.9, "Product 3 (US)", "Jan 04");

            return result;
        }

        private JFreeChart createChart(final CategoryDataset dataset) {

            final JFreeChart chart = ChartFactory.createStackedBarChart(
                    "Max Bar Width", // chart title
                    "Category", // domain axis label
                    "Value", // range axis label
                    dataset, // data
                    PlotOrientation.VERTICAL, // the plot orientation
                    true, // legend
                    true, // tooltips
                    false // urls
                    );

            renderer = new GroupedStackedBarRenderer();
            KeyToGroupMap map = new KeyToGroupMap("G1");
            map.mapKeyToGroup("Product 1 (US)", "G1");

            map.mapKeyToGroup("Product 2 (US)", "G2");
            map.mapKeyToGroup("Product 2 (Europe)", "G2");

            map.mapKeyToGroup("Product 3 (US)", "G3");


            renderer.setSeriesToGroupMap(map);
            double maxBarWidth = renderer.getMaximumBarWidth();

            //renderer.setMaximumBarWidth(1);
            //renderer.setItemMargin(0.85);

            SubCategoryAxis domainAxis = new SubCategoryAxis("Product / Month");
            domainAxis.setCategoryMargin(0.05);
            domainAxis.addSubCategory("Product 1");
            domainAxis.addSubCategory("Product 2");
            domainAxis.addSubCategory("Product 3");

            CategoryPlot plot = (CategoryPlot) chart.getPlot();
            plot.setDomainAxis(domainAxis);
            plot.setRenderer(renderer);
            plot.setFixedLegendItems(createLegendItems());

            return chart;

        }

        /**
         * @return The legend items.
         */
        private LegendItemCollection createLegendItems() {
            LegendItemCollection result = new LegendItemCollection();
            return result;
        }

        @Override
        public void stateChanged(ChangeEvent event) {
            int value = this.slider.getValue();
           /* long minimum = domainAxis.getMinimumDate().getTime();
            long maximum = domainAxis.getMaximumDate().getTime();
            if (value<lastValue) { // left
                minimum = minimum - delta;
                maximum = maximum - delta;
            } else { // right
                minimum = minimum + delta;
                maximum = maximum + delta;
            }
            DateRange range = new DateRange(minimum,maximum);
            domainAxis.setRange(range);*/
            System.out.println("value:"+value);
            renderer.setItemMargin(value/100);

        }

    }

    public DomainTranslateDemo(String title) {
        super(title);
        setContentPane(new DemoPanel());
    }

    public static JPanel createDemoPanel() {
        return new DemoPanel();
    }

    public static void main(String[] args) {
        DomainTranslateDemo demo = new DomainTranslateDemo("Translate Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

}

import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.LegendItemCollection; import org.jfree.chart.axis.DateAxis; import org.jfree.chart.axis.SubCategoryAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.renderer.category.GroupedStackedBarRenderer; import org.jfree.data.KeyToGroupMap; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class DomainTranslateDemo extends ApplicationFrame { private static class DemoPanel extends JPanel implements ChangeListener { private static int SLIDER_INITIAL_VALUE = 50; private JSlider slider; private DateAxis domainAxis; private int lastValue = SLIDER_INITIAL_VALUE; private GroupedStackedBarRenderer renderer; // one month (milliseconds, seconds, minutes, hours, days) private int delta = 1000 * 60 * 60 * 24 * 30; public DemoPanel() { super(new BorderLayout()); final CategoryDataset dataset = createDataset(); final JFreeChart chart = createChart(dataset); final ChartPanel chartPanel = new ChartPanel(chart); Dimension Dim = new Dimension(590, 350); chartPanel.setPreferredSize(Dim); add(chartPanel); JPanel dashboard = new JPanel(new BorderLayout()); dashboard.setBorder(BorderFactory.createEmptyBorder(0, 4, 4, 4)); this.slider = new JSlider(0, 100, SLIDER_INITIAL_VALUE); this.slider.addChangeListener(this); dashboard.add(this.slider); add(dashboard, BorderLayout.SOUTH); } private CategoryDataset createDataset() { DefaultCategoryDataset result = new DefaultCategoryDataset(); result.addValue(20.3, "Product 1 (US)", "Jan 04"); result.addValue(23.3, "Product 2 (US)", "Jan 04"); result.addValue(12.7, "Product 2 (Europe)", "Jan 04"); result.addValue(11.9, "Product 3 (US)", "Jan 04"); return result; } private JFreeChart createChart(final CategoryDataset dataset) { final JFreeChart chart = ChartFactory.createStackedBarChart( "Max Bar Width", // chart title "Category", // domain axis label "Value", // range axis label dataset, // data PlotOrientation.VERTICAL, // the plot orientation true, // legend true, // tooltips false // urls ); renderer = new GroupedStackedBarRenderer(); KeyToGroupMap map = new KeyToGroupMap("G1"); map.mapKeyToGroup("Product 1 (US)", "G1"); map.mapKeyToGroup("Product 2 (US)", "G2"); map.mapKeyToGroup("Product 2 (Europe)", "G2"); map.mapKeyToGroup("Product 3 (US)", "G3"); renderer.setSeriesToGroupMap(map); double maxBarWidth = renderer.getMaximumBarWidth(); //renderer.setMaximumBarWidth(1); //renderer.setItemMargin(0.85); SubCategoryAxis domainAxis = new SubCategoryAxis("Product / Month"); domainAxis.setCategoryMargin(0.05); domainAxis.addSubCategory("Product 1"); domainAxis.addSubCategory("Product 2"); domainAxis.addSubCategory("Product 3"); CategoryPlot plot = (CategoryPlot) chart.getPlot(); plot.setDomainAxis(domainAxis); plot.setRenderer(renderer); plot.setFixedLegendItems(createLegendItems()); return chart; } /** * @return The legend items. */ private LegendItemCollection createLegendItems() { LegendItemCollection result = new LegendItemCollection(); return result; } @Override public void stateChanged(ChangeEvent event) { int value = this.slider.getValue(); /* long minimum = domainAxis.getMinimumDate().getTime(); long maximum = domainAxis.getMaximumDate().getTime(); if (value<lastValue) { // left minimum = minimum - delta; maximum = maximum - delta; } else { // right minimum = minimum + delta; maximum = maximum + delta; } DateRange range = new DateRange(minimum,maximum); domainAxis.setRange(range);*/ System.out.println("value:"+value); renderer.setItemMargin(value/100); } } public DomainTranslateDemo(String title) { super(title); setContentPane(new DemoPanel()); } public static JPanel createDemoPanel() { return new DemoPanel(); } public static void main(String[] args) { DomainTranslateDemo demo = new DomainTranslateDemo("Translate Demo"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } } 此外，我无法根据滑块更改更新图表面板。

任何建议都会非常有用。

由于

1 个答案:

答案 0 :(得分：1)

我没有看到MS Excel如何执行其间距但你在这里遇到了整数除法的问题：

renderer.setItemMargin(value / 100);

确保至少有一个操作数是浮点值。替换为

renderer.setItemMargin(value / 100.0);

否则堆叠条之间的间距将始终为0

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