edu.emory.library.tast.database.graphs.GraphPie.java Source code

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Here is the source code for edu.emory.library.tast.database.graphs.GraphPie.java

Source

/*
Copyright 2010 Emory University
       
   This file is part of Trans-Atlantic Slave Voyages.
       
   Trans-Atlantic Slave Voyages is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
       
   Trans-Atlantic Slave Voyages is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
       
   You should have received a copy of the GNU General Public License
   along with Trans-Atlantic Slave Voyages.  If not, see <http://www.gnu.org/licenses/>. 
*/
package edu.emory.library.tast.database.graphs;

import java.awt.Color;
import java.text.Format;
import java.util.List;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;

public class GraphPie extends GraphType {

    protected GraphPie(String id, IndependentVariable[] independentVariables,
            DependentVariable[] dependentVariables) {
        super(id, independentVariables, dependentVariables);
    }

    public boolean canHaveMoreSeries() {
        return false;
    }

    public JFreeChart createChart(Object[] data) {

        DefaultPieDataset pieDataset = new DefaultPieDataset();

        JFreeChart chart = ChartFactory.createPieChart(null, pieDataset, false, true, false);
        chart.setBackgroundPaint(Color.white);

        List dataSeries = getDataSeries();
        if (dataSeries.size() == 0)
            return null;

        Format formatter = getSelectedIndependentVariable().getFormat();

        for (int i = 0; i < data.length; i++) {
            Object[] row = (Object[]) data[i];

            String cat = formatter == null ? row[0].toString() : formatter.format(row[0]);

            pieDataset.setValue(cat, (Number) row[1]);
        }

        return chart;

    }

}