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How to create a bar chart?

How can I create a bar-chart with JFreeChart, that shortens too long bars with a visible hint?

  • 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 http://www.jfree.org/jfreechart/. If it isn't possible with JFreeChart you can possibly recommend alternative open-source Java-libraries to produce such an output.

  • Answer:

    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.

Mnementh at Stack Overflow Visit the source

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I'm not sure you can do that in JFreeChart. A solution (which is not nice) is to render the chart to an image and then manipulate it (chop it up etc.) as an image, using http://java.sun.com/j2se/1.4.2/docs/api/java/awt/image/RenderedImage.html, and not as a JFreeChart. Unfortunately that's going to be a bit of a pain since you'd probably want to chop at a particular place on the y-axis etc.

Brian Agnew

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