iText 5 itextpdf.jar Source Code

itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

✍: FYIcenter.com

com/itextpdf/text/pdf/parser/Matrix.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Kevin Day, Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * 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 Affero 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 or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.parser;

import java.util.Arrays;

/**
 * Keeps all the values of a 3 by 3 matrix
 * and allows you to do some math with matrices.
 * 
 * @since	2.1.4
 */
public class Matrix {
    /** the row=1, col=1 position ('a') in the matrix. */
    public static final int I11 = 0; 
    /** the row=1, col=2 position ('b') in the matrix. */
    public static final int I12 = 1; 
    /** the row=1, col=3 position (always 0 for 2-D) in the matrix. */
    public static final int I13 = 2;
    /** the row=2, col=1 position ('c') in the matrix. */
    public static final int I21 = 3; 
    /** the row=2, col=2 position ('d') in the matrix. */
    public static final int I22 = 4;  
    /** the row=2, col=3 position (always 0 for 2-D) in the matrix. */
    public static final int I23 = 5;  
    /** the row=3, col=1 ('e', or X translation) position in the matrix. */
    public static final int I31 = 6;  
	/** the row=3, col=2 ('f', or Y translation) position in the matrix. */
    public static final int I32 = 7;  
	/** the row=3, col=3 position (always 1 for 2-D) in the matrix. */
    public static final int I33 = 8;   
    
    /** the values inside the matrix (the identity matrix by default). 
     * <p>For reference, the indeces are as follows:<p>
     * I11 I12 I13<p>
     * I21 I22 I23<p>
     * I31 I32 I33<p>
     */
    private final float[] vals = new float[]{
            1,0,0,
            0,1,0,
            0,0,1
    };
    
    /**
     * constructs a new Matrix with identity.
     */
    public Matrix() {
    }

    /**
     * Constructs a matrix that represents translation
     * @param tx
     * @param ty
     */
    public Matrix(float tx, float ty){
        vals[I31] = tx;
        vals[I32] = ty;
    }
    
    /**
     * Creates a Matrix with 6 specified entries
     * @param a
     * @param b
     * @param c
     * @param d
     * @param e
     * @param f
     */
    public Matrix(float a, float b, float c, float d, float e, float f){
        vals[I11] = a;
        vals[I12] = b;
        vals[I13] = 0;
        vals[I21] = c;
        vals[I22] = d;
        vals[I23] = 0;
        vals[I31] = e;
        vals[I32] = f;
        vals[I33] = 1;
    }
    
    /**
     * Gets a specific value inside the matrix.
     * 
     * <p>For reference, the indeces are as follows:<p>
     * I11 I12 I13<p>
     * I21 I22 I23<p>
     * I31 I32 I33<p>
     * 
     * @param	index	an array index corresponding with a value inside the matrix
     * @return	the value at that specific position.
     */
    public float get(int index){
        return vals[index];
    }
    
    /**
     * multiplies this matrix by 'b' and returns the result
     * See http://en.wikipedia.org/wiki/Matrix_multiplication
     * @param by The matrix to multiply by
     * @return	the resulting matrix
     */
    public Matrix multiply(Matrix by){
        Matrix rslt = new Matrix();
        
        float[] a = vals;
        float[] b = by.vals;
        float[] c = rslt.vals;
        
        c[I11] = a[I11]*b[I11] + a[I12]*b[I21] + a[I13]*b[I31];  
        c[I12] = a[I11]*b[I12] + a[I12]*b[I22] + a[I13]*b[I32]; 
        c[I13] = a[I11]*b[I13] + a[I12]*b[I23] + a[I13]*b[I33]; 
        c[I21] = a[I21]*b[I11] + a[I22]*b[I21] + a[I23]*b[I31];  
        c[I22] = a[I21]*b[I12] + a[I22]*b[I22] + a[I23]*b[I32]; 
        c[I23] = a[I21]*b[I13] + a[I22]*b[I23] + a[I23]*b[I33]; 
        c[I31] = a[I31]*b[I11] + a[I32]*b[I21] + a[I33]*b[I31];  
        c[I32] = a[I31]*b[I12] + a[I32]*b[I22] + a[I33]*b[I32]; 
        c[I33] = a[I31]*b[I13] + a[I32]*b[I23] + a[I33]*b[I33]; 
        
        return rslt;
    }

    /**
     * Subtracts a matrix from this matrix and returns the results
     * @param arg the matrix to subtract from this matrix
     * @return a Matrix object
     */
    public Matrix subtract(Matrix arg){
        Matrix rslt = new Matrix();
        
        float[] a = vals;
        float[] b = arg.vals;
        float[] c = rslt.vals;
        
        c[I11] = a[I11]-b[I11];  
        c[I12] = a[I12]-b[I12]; 
        c[I13] = a[I13]-b[I13]; 
        c[I21] = a[I21]-b[I21];  
        c[I22] = a[I22]-b[I22]; 
        c[I23] = a[I23]-b[I23]; 
        c[I31] = a[I31]-b[I31];  
        c[I32] = a[I32]-b[I32]; 
        c[I33] = a[I33]-b[I33]; 

        return rslt;
    }
    
    /**
     * Computes the determinant of the matrix.
     * @return the determinant of the matrix
     * @since 5.0.3
     */
    public float getDeterminant(){
        // ref http://en.wikipedia.org/wiki/Determinant   
        // note that in PDF, I13 and I23 are always 0 and I33 is always 1
        // so this could be simplified/faster
        return    vals[I11] * vals[I22] * vals[I33] 
                + vals[I12] * vals[I23] * vals[I31]
                + vals[I13] * vals[I21] * vals[I32]
                - vals[I11] * vals[I23] * vals[I32]
                - vals[I12] * vals[I21] * vals[I33]
                - vals[I13] * vals[I22] * vals[I31];
    }
    
    /**
     * Checks equality of matrices.
     * @param obj	the other Matrix that needs to be compared with this matrix.
     * @return	true if both matrices are equal
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
        if (!(obj instanceof Matrix))
            return false;
        
        return Arrays.equals(vals, ((Matrix)obj).vals);
    }
    
    /**
     * Generates a hash code for this object.
     * @return	the hash code of this object
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        //return Arrays.hashCode(vals); // JDK 5 code, replaced with the following
        
        int result = 1;
        for (int i = 0; i < vals.length; i++)
            result = 31 * result + Float.floatToIntBits(vals[i]);

        return result;
    }
    
    /**
     * Generates a String representation of the matrix.
     * @return	the values, delimited with tabs and newlines.
     * @see java.lang.Object#toString()
     */
    public String toString() {
        return  vals[I11] + "\t" + vals[I12] + "\t" + vals[I13] + "\n" + 
                vals[I21] + "\t" + vals[I22] + "\t" + vals[I13] + "\n" +
                vals[I31] + "\t" + vals[I32] + "\t" + vals[I33];
    }
}

com/itextpdf/text/pdf/parser/Matrix.java

 

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File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
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