how to set y-axis scale for BarChart

[hklow]

can we set the scale of y-axis? or least not to show decimal units when the field/variable returns 0 or 1 or 2? the field/variable is defined as Integer, and it doesn't make sense if the Y axis shows 0.25, 0.5, 0.75...

[pkwooster]

Setting the scale or any other attributes of the axes is a JFreeChart activity. Here's some customizer code that adjusts the item margins and autoscale zero behaviour, it will provide some hints on where to start

Code:

   public void customize(JFreeChart jFreeChart, JRChart jRChart)
   {
      super.customize(jFreeChart, jRChart);

      CategoryPlot plot = jFreeChart.getCategoryPlot();
      BarRenderer renderer = (BarRenderer) plot.getRenderer();
      ValueAxis axis = plot.getRangeAxis();
      if (axis instanceof NumberAxis) {
          NumberAxis naxis = (NumberAxis)axis;
          Range rng = plot.getDataRange(naxis);
          double max = rng.getUpperBound();
          double min = rng.getLowerBound();
          boolean iz = ((max - min) > (max/5.0));
    	  naxis.setAutoRangeIncludesZero(iz);
    	  naxis.setAutoRangeStickyZero(iz);
      }
      renderer.setItemMargin(0.0);
   }