samplexydataset.java

jfreechart1.0.6源程序,没有注释,不过都能运行起来

package demo;

import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.xy.AbstractXYDataset;
import org.jfree.data.xy.XYDataset;

public class SampleXYDataset extends AbstractXYDataset
    implements XYDataset
{

    public SampleXYDataset()
    {
        translate = 0.0D;
    }

    public double getTranslate()
    {
        return translate;
    }

    public void setTranslate(double d)
    {
        translate = d;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    public Number getX(int i, int j)
    {
        return new Double(-10D + translate + (double)j / 10D);
    }

    public Number getY(int i, int j)
    {
        if(i == 0)
            return new Double(Math.cos(-10D + translate + (double)j / 10D));
        else
            return new Double(2D * Math.sin(-10D + translate + (double)j / 10D));
    }

    public int getSeriesCount()
    {
        return 2;
    }

    public Comparable getSeriesKey(int i)
    {
        if(i == 0)
            return "y = cosine(x)";
        if(i == 1)
            return "y = 2*sine(x)";
        else
            return "Error";
    }

    public int getItemCount(int i)
    {
        return 200;
    }

    private double translate;
}