Error with a class customiser for charts - jasper-reports

Question

I want to customise my charts so I want to use a class customiser,
I have used the following code to change the categorie label to vertical , but I don't know why it generate an error!
the code:
public void customize(JFreeChart jfc, JRChart jrc) {
CategoryPlot myPlot = jfc.getCategoryPlot();
HorizontalCategoryAxis axis = (HorizontalCategoryAxis)myPlot.getDomainAxis();
axis.setVerticalCategoryLabels(true);
}
the error is:
cannot find symbol : Class HorizontalCategoryAxis
Also I have tried:
CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();
CategoryItemLabelGenerator generator = new StandardCategoryItemLabelGenerator("{2}", new DecimalFormat("0.00"));
renderer.setLabelGenerator(generator);
renderer.setItemLabelsVisible(true);
XYItemRenderer renderer2 = (XYItemRenderer) plot.getRenderer();
XYItemLabelGenerator generator2 = new StandardXYItemLabelGenerator("{2}", new DecimalFormat("0.00"));
renderer.setLabelGenerator(generator);
and the errors:
cannot find symbol appear for the line :
renderer.setLabelGenerator(generator);
and
no suitable constructor for
XYItemLabelGenerator generator2
my reference is:
http://files.blogjava.net/hao446tian/jfreechart-1.0.1-US_developer_guide.pdf
UPDATE
Still I can't see the categorieExpression( on the Y axis) :(((

Answer 1

First of all your failed code seems to be version mismatch between your examples and the library you use. The setLabelGenerator method has been removed and replaced with setBaseItemLabelGenerator:
CategoryPlot plot = yourPlot;
CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();
CategoryItemLabelGenerator generator = new StandardCategoryItemLabelGenerator("{2}", new DecimalFormat("0.00"));
renderer.setBaseItemLabelGenerator(generator);
renderer.setBaseItemLabelsVisible(true);
XYItemRenderer renderer2 = (XYItemRenderer) plot.getRenderer();
XYItemLabelGenerator generator2 = new StandardXYItemLabelGenerator("{2}",
new DecimalFormat("0.00"),
new DecimalFormat("0.00"));
renderer.setBaseItemLabelGenerator(generator);
You can see in my example that the StandardXYItemLabelGenerator takes two formats, one for the x values and one for y.
As for the use of HorizontalCategoryAxis it suffered the same fate as setLabelGenerator. Assuming you want a vertical plot with a CategoryAxis that has labels that are vertical, not horizontal, you can use setLabelAngle to achieve the desired effect:
public void customize(JFreeChart jfc, JRChart jrc) {
CategoryPlot myPlot = jfc.getCategoryPlot();
CategoryAxis axis = myPlot.getDomainAxis();
axis.setLabelAngle(-Math.PI / 2);
}