controle.JfreeChartController.java Source code

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Here is the source code for controle.JfreeChartController.java

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/*
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package controle;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import javax.annotation.PostConstruct;
import javax.inject.Named;
import javax.enterprise.context.RequestScoped;
import javax.imageio.ImageIO;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.StreamedContent;

/**
 *
 * @author Gleywson
 */
@Named(value = "jfreeChartController")
@RequestScoped
public class JfreeChartController {

    private StreamedContent graphicText;

    private StreamedContent chart;

    @PostConstruct
    public void init() {
        try {
            //Graphic Text
            BufferedImage bufferedImg = new BufferedImage(100, 25, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = bufferedImg.createGraphics();
            g2.drawString("This is a text", 0, 10);
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            ImageIO.write(bufferedImg, "png", os);
            graphicText = new DefaultStreamedContent(new ByteArrayInputStream(os.toByteArray()), "image/png");

            //Chart
            JFreeChart jfreechart = ChartFactory.createLineChart("cosseno", "X", "Y", createDataset());
            File chartFile = new File("dynamichart");
            ChartUtilities.saveChartAsPNG(chartFile, jfreechart, 800, 400);
            chart = new DefaultStreamedContent(new FileInputStream(chartFile), "image/png");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public StreamedContent getGraphicText() {
        return graphicText;
    }

    public StreamedContent getChart() {
        return chart;
    }

    private DefaultCategoryDataset createDataset() {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();

        for (double i = 0; i <= 10; i += 0.1) {
            dataset.addValue(Math.cos(Math.PI * i), "cosseno", Double.valueOf(i));
        }

        return dataset;
    }

}