pdtype0font.java

非常有用的操作pdf文件的java源码

/**
 * Copyright (c) 2003-2006, www.pdfbox.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of pdfbox; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://www.pdfbox.org
 *
 */
package org.pdfbox.pdmodel.font;

import java.awt.Graphics;

import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.common.PDRectangle;

import java.io.IOException;

/**
 * This is implementation of the Type0 Font.
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.9 $
 */
public class PDType0Font extends PDFont
{
    /**
     * Constructor.
     */
    public PDType0Font()
    {
        super();
        font.setItem( COSName.SUBTYPE, COSName.getPDFName( "Type0" ) );
    }

    /**
     * Constructor.
     *
     * @param fontDictionary The font dictionary according to the PDF specification.
     */
    public PDType0Font( COSDictionary fontDictionary )
    {
        super( fontDictionary );
    }

    /**
     * {@inheritDoc}
     */
    public void drawString( String string, Graphics g, float fontSize, 
        float xScale, float yScale, float x, float y )
    {
        throw new RuntimeException( "Not yet implemented" );
    }
    
    /**
     * This will get the fonts bouding box.
     *
     * @return The fonts bouding box.
     * 
     * @throws IOException If there is an error getting the bounding box.
     */
    public PDRectangle getFontBoundingBox() throws IOException
    {
        throw new RuntimeException( "Not yet implemented" );
    }

    /**
     * This will get the font width for a character.
     *
     * @param c The character code to get the width for.
     * @param offset The offset into the array.
     * @param length The length of the data.
     *
     * @return The width is in 1000 unit of text space, ie 333 or 777
     *
     * @throws IOException If an error occurs while parsing.
     */
    public float getFontWidth( byte[] c, int offset, int length ) throws IOException
    {
        COSArray descendantFontArray =
            (COSArray)font.getDictionaryObject( COSName.getPDFName( "DescendantFonts" ) );

        COSDictionary descendantFontDictionary = (COSDictionary)descendantFontArray.getObject( 0 );
        PDFont descendentFont = PDFontFactory.createFont( descendantFontDictionary );

        return descendentFont.getFontWidth( c, offset, length );
    }
    
    /**
     * This will get the font height for a character.
     *
     * @param c The character code to get the height for.
     * @param offset The offset into the array.
     * @param length The length of the data.
     *
     * @return The width is in 1000 unit of text space, ie 333 or 777
     *
     * @throws IOException If an error occurs while parsing.
     */
    public float getFontHeight( byte[] c, int offset, int length ) throws IOException
    {
        COSArray descendantFontArray =
            (COSArray)font.getDictionaryObject( COSName.getPDFName( "DescendantFonts" ) );

        COSDictionary descendantFontDictionary = (COSDictionary)descendantFontArray.getObject( 0 );
        PDFont descendentFont = PDFontFactory.createFont( descendantFontDictionary );

        return descendentFont.getFontHeight( c, offset, length );
    }

    /**
     * This will get the average font width for all characters.
     *
     * @return The width is in 1000 unit of text space, ie 333 or 777
     *
     * @throws IOException If an error occurs while parsing.
     */
    public float getAverageFontWidth() throws IOException
    {
        COSArray descendantFontArray =
            (COSArray)font.getDictionaryObject( COSName.getPDFName( "DescendantFonts" ) );

        COSDictionary descendantFontDictionary = (COSDictionary)descendantFontArray.getObject( 0 );
        PDFont descendentFont = PDFontFactory.createFont( descendantFontDictionary );

        return descendentFont.getAverageFontWidth();
    }
}