at.knowcenter.wag.egov.egiz.pdfbox2.pdf.PDFUtilities.java Source code

Introduction

Here is the source code for at.knowcenter.wag.egov.egiz.pdfbox2.pdf.PDFUtilities.java

Source

/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: PDFUtilities.java,v 1.3 2006/10/31 08:09:33 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdfbox2.pdf;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

import at.gv.egiz.pdfas.common.settings.ISettings;
import at.gv.egiz.pdfas.lib.api.IConfigurationConstants;
import at.gv.egiz.pdfas.lib.impl.pdfbox2.positioning.PositioningRenderer;
import at.gv.egiz.pdfas.lib.impl.stamping.IPDFVisualObject;

public abstract class PDFUtilities implements IConfigurationConstants {

    public static Color MAGIC_COLOR = new Color(152, 254, 52);// green-ish background

    public static float getMaxYPosition(PDDocument pdfDataSource, int page, IPDFVisualObject pdfTable,
            float signatureMarginVertical, float footer_line, ISettings settings) throws IOException {

        PositioningRenderer renderer = new PositioningRenderer(pdfDataSource);
        //BufferedImage bim = renderer.renderImage(page);

        int width = (int) pdfDataSource.getPage(page).getCropBox().getWidth();
        int height = (int) pdfDataSource.getPage(page).getCropBox().getHeight();
        BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        Graphics2D graphics = bim.createGraphics();
        graphics.setBackground(MAGIC_COLOR);

        renderer.renderPageToGraphics(page, graphics);

        Color bgColor = MAGIC_COLOR;

        if ("true".equals(settings.getValue(BG_COLOR_DETECTION))) { //only used if background color should be determined automatically
            bgColor = determineBackgroundColor(bim);
        }

        int yCoord = bim.getHeight() - 1 - (int) footer_line;

        for (int row = yCoord; row >= 0; row--) {
            for (int col = 0; col < bim.getWidth(); col++) {
                int val = bim.getRGB(col, row);
                if (val != bgColor.getRGB()) {
                    yCoord = row;
                    row = -1;
                    break;
                }
            }
        }

        String outFile = settings.getValue(SIG_PLACEMENT_DEBUG_OUTPUT);
        if (outFile != null) {
            ImageIOUtil.writeImage(bim, outFile, 72);
        }
        return yCoord;
    }

    public static Color determineBackgroundColor(BufferedImage bim) {

        int inset = 5;//px

        int pixelUpLeft = bim.getRGB(inset, inset);
        int pixelUpRight = bim.getRGB(bim.getWidth() - inset, inset);
        int pixelDownLeft = bim.getRGB(inset, bim.getHeight() - inset);
        int pixelDownRight = bim.getRGB(bim.getWidth() - inset, bim.getHeight() - inset);

        HashMap<Integer, Integer> stats = new HashMap<Integer, Integer>();
        stats.put(pixelUpLeft, 0);
        stats.put(pixelUpRight, 0);
        stats.put(pixelDownLeft, 0);
        stats.put(pixelDownRight, 0);

        stats.put(pixelUpLeft, stats.get(pixelUpLeft) + 1);
        stats.put(pixelUpRight, stats.get(pixelUpRight) + 1);
        stats.put(pixelDownLeft, stats.get(pixelDownLeft) + 1);
        stats.put(pixelDownRight, stats.get(pixelDownRight) + 1);

        int bgValue = -1;
        int cnt = 0;
        for (int key : stats.keySet()) {
            if (stats.get(key) > cnt) {
                cnt = stats.get(key);
                bgValue = key;
            }
        }

        return new Color(bgValue);
    }

}