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());

		}

	}

}