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Category Step Chart Example using JFreeChart
Posted on: September 1, 2008 at 12:00 AM

This Example shows you how to create a category step chart using JFreeChart. Code of the chart shows you run rate at different over in a match.

Category Step Chart Example using JFreeChart

This Example shows you how to create a category step chart using JFreeChart. Code of the chart shows you run rate at different over in a match.

In the code given below we have extended class ApplicationFrame to create a frame and also pass a string value to the constructor of ApplicationFrame class by using super keyword that will be name of the created frame.

The method used in this example are described below:

pack(): This method invokes the layout manager.

centerFrameOnScreen(): This method is used for the position of the frame in the middle of the screen.

setVisible(): This method is used for display frame on the screen.

createCategoryDataset(): This method is used for create data set according to the category.

JFreeChart: JFreeChart class object is used to create new chart according CategoryPlot class object

setBackgroundPaint(): This method is used to set the paint used to fill the chart background.

CategoryStepChart .java


import java.awt.Color;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.axis.ValueAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.renderer.category.CategoryItemRenderer;

import org.jfree.chart.renderer.category.CategoryStepRenderer;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.general.DatasetUtilities;

import org.jfree.ui.ApplicationFrame;

import org.jfree.ui.RefineryUtilities;



public class CategoryStepChart extends ApplicationFrame {



  public CategoryStepChart(String tietel) {

  super(tietel);



  final CategoryDataset dataset = createDataset();

  final JFreeChart chart = createChart(dataset);

  final ChartPanel chartPanel = new ChartPanel(chart);

  chartPanel.setPreferredSize(

   new java.awt.Dimension(600, 350));

  setContentPane(chartPanel);

  }



  private CategoryDataset createDataset() {



  double[][] run = new double[][]{

  {5, 4, 3, 6, 7, 8, 3, 6, 3, 12},

  {9, 2, 2, 6, 8, 4, 0, 8, 9, 11}

  };



  double[][] runRate = new double[2][10];

  float team1run = 0;

  float team2run = 0;

  for (int i = 0; i < run[0].length; i++) {

  

  team1run += run[0][i];

  team2run += run[1][i];



  runRate[0][i] = team1run / (i+1);

  runRate[1][i] = team2run / (i+1);

  }

  return DatasetUtilities.createCategoryDataset(

  "Team ", "", runRate);

  }



  private JFreeChart createChart(CategoryDataset dataset) {



  final CategoryItemRenderer renderer = 

  new CategoryStepRenderer(true);

  final CategoryAxis domainAxis = 

  new CategoryAxis("Over");

  final ValueAxis rangeAxis = new NumberAxis("Run Rate");

  final CategoryPlot plot = 

  new CategoryPlot(dataset, domainAxis, 

   
rangeAxis, renderer);

  final JFreeChart chart = 

  new JFreeChart("Score Bord", plot);



  chart.setBackgroundPaint(new Color(249, 231, 236));

  return chart;



  }



  public static void main(String args[]) {

  CategoryStepChart chart = 

  new CategoryStepChart("Candle Stick Chart");

  chart.pack();

  RefineryUtilities.centerFrameOnScreen(chart);

  chart.setVisible(true);

  }

}

Output:

Download code

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