code: public static String barChart(String title, SimonUnit unit, boolean showMaxMin, StopwatchSample... samples) {
  		return new GoogleChartImageGenerator(samples, title, unit, showMaxMin).process();
  	}
docs: Generates Google bar chart URL for the provided samples.
  
  @param title chart title
  @param unit unit requested for displaying results
  @param showMaxMin true if additional datasets for max and min values should be shown
  @param samples stopwatch samples
  @return URL generating the bar chart