naturalbreaks.java

geotools的源码

/*
 * NaturalBreaks.java
 *
 * Created on 02 November 2001, 19:08
 */

package uk.ac.leeds.ccg.geotools.classification;

import uk.ac.leeds.ccg.geotools.*;
import com.sun.java.util.collections.*;
import uk.ac.leeds.ccg.geotools.misc.*;
/**
 *
 * @author  James Macgill
 * @version
 */
public class NaturalBreaks extends uk.ac.leeds.ccg.geotools.classification.SimpleClassifier implements uk.ac.leeds.ccg.geotools.classification.Classifier {
    
    /** Creates new NaturalBreaks */
    public NaturalBreaks(GeoData source,int binCount) {
        buildBins(source,binCount);
    }
    
    public void buildBins(GeoData data,int cat){
        int items = data.getSize();
        int span = (int) (Math.ceil((double) items / (double) cat));
        double min = data.getMin();
        double max = data.getMax();
        double next;
        double last = min;
        
        ArrayList list = new ArrayList();
        java.util.Enumeration ids = data.getIds();
        while (ids.hasMoreElements()) {
            list.add(new Double(data.getValue(((Integer)
            ids.nextElement()).intValue())));
        }
        Collections.sort(list, new doubleComp());
        int index = span;
        
        
        int[] kclass = getJenksBreaks(list, cat); //Jenks