package de.laures.cewolf.cpp;

 import java.util.Map;

 import org.jfree.chart.JFreeChart;

 import org.jfree.chart.axis.CategoryAxis;

 import org.jfree.chart.axis.CategoryLabelPositions;

 import org.jfree.chart.plot.CategoryPlot;

 import org.jfree.data.category.CategoryDataset;

 import de.laures.cewolf.ChartPostProcessor;

 /**

 * A cewolf post-processor for rotating and/or removing the labels on the X-Axis

 * parameters:

 * rotate_at: make the labels vertical

 * skip_at: print only some of the labels (so they don't overlap)

 * remove_at: don't print any labels

 *

 * Usage:

 * <chart:chartpostprocessor id="labelRotation">

 * <chart:param name="rotate_at" value='<%= new Integer(10) %>'/>

 * <chart:param name="skip_at" value='<%= new Integer(50) %>'/>

 * <chart:param name="remove_at" value='<%= new Integer(100) %>'/>

 * </chart:chartpostprocessor>

 *

 *

 * @author Rich Unger

 */

 public class RotatedAxisLabels implements ChartPostProcessor {

 public void processChart(Object chart, Map params) {

 		CategoryPlot plot = (CategoryPlot) ((JFreeChart) chart).getPlot();

 		CategoryAxis axis = plot.getDomainAxis();

 		Number rotateThreshold = (Number) params.get("rotate_at");

 		Number skipThreshold = (Number) params.get("skip_at");

 		Number removeThreshold = (Number) params.get("remove_at");

 		CategoryDataset dataset = plot.getDataset();

 		int iCategoryCount = dataset.getRowCount();

 		if (rotateThreshold != null) 

     {

       if (iCategoryCount >= rotateThreshold.intValue()) 

       {

         axis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);

       }

       else 

       {

         axis.setCategoryLabelPositions(CategoryLabelPositions.STANDARD);

       }

     }

 		if (skipThreshold != null) 

     {

       //this method does nothing in jfreechart .9.18

 			//axis.setSkipCategoryLabelsToFit(iCategoryCount >= skipThreshold.intValue());

 		}

     if (removeThreshold != null) 

     {

 			axis.setTickLabelsVisible(iCategoryCount < removeThreshold.intValue());

 		}

 	}

 }