pdfpage.java

一个java操作pdf文件的开发包,很好用的.

/*
 * $Id: PdfPage.java,v 1.24 2002/07/09 11:28:23 blowagie Exp $
 * $Name:  $
 *
 * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.pdf;
import com.lowagie.text.Rectangle;
/**
 * <CODE>PdfPage</CODE> is the PDF Page-object.
 * <P>
 * A Page object is a dictionary whose keys describe a single page containing text,
 * graphics, and images. A Page onjects is a leaf of the Pages tree.<BR>
 * This object is described in the 'Portable Document Format Reference Manual version 1.3'
 * section 6.4 (page 73-81)
 *
 * @see		PdfPageElement
 * @see		PdfPages
 */

public class PdfPage extends PdfDictionary implements PdfPageElement {
    
    // membervariables
    
/** value of the <B>Rotate</B> key for a page in PORTRAIT */
    public static final PdfNumber PORTRAIT = new PdfNumber(0);
    
/** value of the <B>Rotate</B> key for a page in LANDSCAPE */
    public static final PdfNumber LANDSCAPE = new PdfNumber(90);
    
/** value of the <B>Rotate</B> key for a page in INVERTEDPORTRAIT */
    public static final PdfNumber INVERTEDPORTRAIT = new PdfNumber(180);
    
/**	value of the <B>Rotate</B> key for a page in SEASCAPE */
    public static final PdfNumber SEASCAPE = new PdfNumber(270);
    
/** value of the <B>MediaBox</B> key */
    PdfRectangle mediaBox;
    
    // constructors
    
/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 * @param		rotate			a value for the <B>Rotate</B> key
 */
    
    PdfPage(PdfRectangle mediaBox, Rectangle cropBox, PdfIndirectReference resources, PdfNumber rotate) {
        super(PAGE);
        this.mediaBox = mediaBox;
        put(PdfName.MEDIABOX, mediaBox);
        put(PdfName.RESOURCES, resources);
        if (rotate != null) {
            put(PdfName.ROTATE, rotate);
        }
        if (cropBox != null)
            put(PdfName.CROPBOX, new PdfRectangle(cropBox));
    }
    
/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 * @param		rotate			a value for the <B>Rotate</B> key
 */
    
    PdfPage(PdfRectangle mediaBox, Rectangle cropBox, PdfResources resources, PdfNumber rotate) {
        super(PAGE);
        this.mediaBox = mediaBox;
        put(PdfName.MEDIABOX, mediaBox);
        put(PdfName.RESOURCES, resources);
        if (rotate != null) {
            put(PdfName.ROTATE, rotate);
        }
        if (cropBox != null)
            put(PdfName.CROPBOX, new PdfRectangle(cropBox));
    }
    
/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 */
    
    PdfPage(PdfRectangle mediaBox, Rectangle cropBox, PdfIndirectReference resources) {
        this(mediaBox, cropBox, resources, null);
    }
    
/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 */
    
    PdfPage(PdfRectangle mediaBox, Rectangle cropBox, PdfResources resources) {
        this(mediaBox, cropBox, resources, null);
    }
    
    // implementation of the PdfPageElement interface
    
/**
 * Set the value for the <B>Parent</B> key in the Page or Pages Dictionary.
 *
 * @param		reference			an indirect reference to a <CODE>PdfPages</CODE>-object
 */
    
    public void setParent(PdfIndirectReference reference) {
        put(PdfName.PARENT, reference);
    }
    
/**
 * Checks if this page element is a tree of pages.
 * <P>
 * This method allways returns <CODE>false</CODE>.
 *
 * @return	<CODE>false</CODE> because this is a single page
 */
    
    public boolean isParent() {
        return false;
    }
    
    // methods
    
/**
 * Adds an indirect reference pointing to a <CODE>PdfContents</CODE>-object.
 *
 * @param		contents		an indirect reference to a <CODE>PdfContents</CODE>-object
 */
    
    void add(PdfIndirectReference contents) {
        put(PdfName.CONTENTS, contents);
    }
    
/**
 * Rotates the mediabox, but not the text in it.
 *
 * @return		a <CODE>PdfRectangle</CODE>
 */
    
    PdfRectangle rotateMediaBox() {
        this.mediaBox =  mediaBox.rotate();
        put(PdfName.MEDIABOX, this.mediaBox);
        return this.mediaBox;
    }
    
/**
 * Returns the MediaBox of this Page.
 *
 * @return		a <CODE>PdfRectangle</CODE>
 */
    
    PdfRectangle getMediaBox() {
        return mediaBox;
    }
}