title: How to set the category axis format of a bar chart to vertical?
body: <p>I'm using dynamicReports framework to generate a bar chart, the chart is correctly generated but I'want to have verticale category labels ( mine are horizontal) like this : </p>
  
  <p><img src="https://i.stack.imgur.com/7FcPQ.png" alt="enter image description here"> </p>
  
  <p>this is my code : </p>
  
  <pre><code>report().setTemplate(Templates.reportTemplate)
          .columns(itemColumn, quantityColumn, unitPriceColumn)
          .title(Templates.createTitleComponent("BarChart"))
          .summary(cht.barChart()
              .setTitle("Bar chart")
              .setTitleFont(boldFont)
              .setCategory(itemColumn)
              .series(cht.serie(quantityColumn) )
                     .series(cht.serie(unitPriceColumn))
                    .setCategoryAxisFormat(cht.axisFormat().setVerticalTickLabels(true).setLabel("Item")))
                  .pageFooter(Templates.footerComponent)
                  .setDataSource(createDataSource())
                  .show();
  </code></pre>