com.vectorprint.report.jfree.ItextChartHelper.java Source code

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Here is the source code for com.vectorprint.report.jfree.ItextChartHelper.java

Source

package com.vectorprint.report.jfree;

/*
 * #%L
 * VectorPrintReport4.0
 * %%
 * Copyright (C) 2012 - 2013 VectorPrint
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */
//~--- non-JDK imports --------------------------------------------------------
import com.itextpdf.awt.PdfGraphics2D;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfTemplate;

import org.jfree.chart.*;

//~--- JDK imports ------------------------------------------------------------
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

/**
 * Helper that can plot a JFreeChart on a PdfContentByte while preserving the quality of the graphics.
 *
 * @author Eduard Drenth at VectorPrint.nl
 */
public class ItextChartHelper {

    /**
     *
     * @param chart the chart tp plot
     * @param contentByte the canvas to plot to
     * @param width the width of the chart will be fit to
     * @param height the height of the chart will be fit to
     * @return
     * @throws BadElementException
     */
    public static Image getChartImage(JFreeChart chart, PdfContentByte contentByte, float width, float height,
            float opacity) throws BadElementException {

        // create PdfTemplate from PdfContentByte
        PdfTemplate template = contentByte.createTemplate(width, height);
        template.saveState();
        PdfGState pgs = new PdfGState();
        pgs.setFillOpacity(opacity);
        pgs.setStrokeOpacity(opacity);
        template.setGState(pgs);

        // create Graphics2D from PdfTemplate
        Graphics2D g2 = new PdfGraphics2D(template, width, height);

        // setup the drawing area
        Rectangle2D r2D = new Rectangle2D.Double(0, 0, width, height);

        // pass the Graphics2D and drawing area to JFreeChart
        chart.draw(g2, r2D);
        g2.dispose(); // always dispose this

        template.restoreState();

        // create Image from PdfTemplate
        return Image.getInstance(template);
    }
}