Simple Benchmark chart class in Java.

Benchmark.java

/**
 * Benchmark chart.
 * Fancy benchmark chart generator.
 *
 * @since 4.04.2013
 * @author Christian Metz | [email protected]
 * @version 1.0
 */
class Benchmark {

  private final String CHART_API = "https://chart.googleapis.com/chart";

  private final LinkedHashMap<String, Long> benchmarks = new LinkedHashMap<>();
  private int width;
  private int height;

  /**
   * Basic custom constructor.
   */
  public Benchmark() {
    this(400, 250);
  }

  /**
   * Size custom constructor.
   *
   * @param width
   * @param height
   */
  public Benchmark(int width, int height) {
    this.width = width;
    this.height = height;
  }

  /**
   * Add benchmark.
   *
   * @param title Description of the benchmark.
   * @param value Measured value (e.g. time in ms.)
   */
  public void add(String title, long value) {
    benchmarks.put(title, value);
  }

  /**
   * Get chart image.
   *
   * @return Chart image icon.
   */
  public ImageIcon getChart() {
    // assemble API call
    String apiCall = CHART_API;
    apiCall += "?cht=bhg&chs=" + width + "x" + height;
    
    String titles = "";
    StringBuilder measurements = new StringBuilder();
    for (Map.Entry<String, Long> entry : benchmarks.entrySet()) {
      titles += entry.getKey() + "|";
      measurements.insert(0, entry.getValue() + ",");
    }
    
    apiCall += "&chd=t:" + measurements.substring(0, measurements.length() - 1);
    apiCall += "&chds=0,10000&chco=4d89f9,c6d9fd,00B88A&chds=0,10000&chbh=a&chxs=0,000000,0,0,_&chxt=y&chm=N,000000,0,,10|N,000000,1,,10|N,000000,2,,10&chxt=x,y";
    apiCall += "&chxl=1:|" + titles;
    
    try {
      URL url = new URL(apiCall);
      BufferedImage image = ImageIO.read(url);
      return new ImageIcon(image);
    } catch (Exception e) {
      System.err.println("Sorry - Chart creation failed :(");
    }
    
    return null;
  }

}

Main.java

/**
 * Test class.
 */
class Main {

  public static void main(String[] args) {
    // create new instance
    Benchmark benchmark = new Benchmark();
    
    // add some data
    benchmark.add("Pizza", 10000);
    benchmark.add("Cake", 3000);
    benchmark.add("Chocolat", 8000);
    
    // generate chart
    ImageIcon chart = benchmark.getChart();
    
    // display it with a JOptionPane
    JOptionPane.showMessageDialog(null, new JLabel(chart), "Elvira's Benchmark chart!", JOptionPane.INFORMATION_MESSAGE);
  }

}