如何使用JFreeChart创建条形图,使用可见提示缩短太长的条形图？

Question

我想创建一个条形图,但应该缩短非常高的值.一个例子是这个图像:

缩短图http://www.epa.gov/recovery/images/bar-chart.gif

我希望很清楚我想要什么.

我的问题是:如何使用JFreeChart执行此操作.如果JFreeChart无法实现,您可以推荐其他开源Java库来生成这样的输出.

Answer 1

你可以用CombinedDomainCategoryPlot或者做CombinedDomainXYPlot.将第一个绘图的范围轴设置为截止值,然后使用第二个绘图执行类似的操作.然后将它们添加到组合图中.

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.CombinedDomainCategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;

public class PlayChart {

    public static void main(String[] args) {


        DefaultCategoryDataset ds = new DefaultCategoryDataset();
        ds.addValue(100, "A", "A");
        ds.addValue(200, "A", "B");
        ds.addValue(400, "A", "C");
        ds.addValue(500, "A", "D");
        ds.addValue(2000, "A", "E");


        JFreeChart bc = ChartFactory.createBarChart("My Bar Chart", "Things", "Counts",  ds, PlotOrientation.VERTICAL, true, false, false);
        JFreeChart bcTop = ChartFactory.createBarChart("My Bar Chart", "Things", "Counts",  ds, PlotOrientation.VERTICAL, true, false, false);

        CombinedDomainCategoryPlot combinedPlot = new CombinedDomainCategoryPlot();
        CategoryPlot topPlot = bcTop.getCategoryPlot();
        NumberAxis topAxis = (NumberAxis) topPlot.getRangeAxis();
        topAxis.setLowerBound(1500);
        topAxis.setUpperBound(2000);

        combinedPlot.add(topPlot, 1);
        CategoryPlot mainPlot = bc.getCategoryPlot();
        combinedPlot.add(mainPlot, 5);

        NumberAxis mainAxis = (NumberAxis) mainPlot.getRangeAxis();;
        mainAxis.setLowerBound(0);
        mainAxis.setUpperBound(600);

        JFreeChart combinedChart = new JFreeChart("Test", combinedPlot);

        ChartFrame cf = new ChartFrame("Test", combinedChart);
        cf.setSize(800, 600);
        cf.setVisible(true);

    }

}

这些图将共享相同的X轴.您需要使用渲染器来设置颜色和标签.

删除了死的ImageShack链接