如何使用JFreeChart创建一个条形图，缩短太长的条形并显示可见的提示？ [英] How can I create a bar-chart with JFreeChart, that shortens too long bars with a visible hint?

问题描述

我想创建一个条形图，但非常高的值应该缩短。例如：

我想问的是：我怎么办？这与 JFreeChart 。如果JFreeChart不可能，你可以推荐其他开源的Java库来产生这样的输出。

解决方案

您可以使用 CombinedDomainCategoryPlot 或 CombinedDomainXYPlot 来完成。将第一个绘图的范围轴设置为您的截止值，然后使用第二个绘图执行类似操作。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）; 
 
} 
 
} 
  

共享相同的X轴。您需要使用渲染器来设置颜色和标签。

已移除死的ImageShack链接

I want to create a bar-chart, but extraordinary high values should be shortened. An example is this image:

I hope it is clear what I want.

My question is: How can I do this with JFreeChart. If it isn't possible with JFreeChart you can possibly recommend alternative open-source Java-libraries to produce such an output.

解决方案

You could do it with a CombinedDomainCategoryPlot or CombinedDomainXYPlot. Set the range axis of the first plot to your cut off value and then do something similar with the second plot. Then add them to a combined plot.

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);

    }

}

The plots will share the same X-axis. You'll need to play with the renderers to set colours and labels.

removed dead ImageShack link

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