iText kernel.jar Source Code
kernel.jar is a component in iText Java library to provide low-level functionalities.
iText Java library allows you to generate and manage PDF documents.
The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.
You can compile it to generate your JAR file, using kernel.pom as the build configuration file.
The source code of kernel-7.1.4.jar is provided below:
✍: FYIcenter.com
⏎ com/itextpdf/kernel/geom/Matrix.java
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 iText Group NV
Authors: 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.kernel.geom;
import java.io.Serializable;
import java.util.Arrays;
/**
* Keeps all the values of a 3 by 3 matrix and allows you to
* do some math with matrices.
*/
public class Matrix implements Serializable {
/** 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;
private static final long serialVersionUID = 7434885566068528477L;
/** 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 x-axis translation
* @param ty y-axis translation
*/
public Matrix(float tx, float ty) {
vals[I31] = tx;
vals[I32] = ty;
}
/**
* Creates a Matrix with 9 specified entries
* @param e11 element at position (1,1)
* @param e12 element at position (1,2)
* @param e13 element at position (1,3)
* @param e21 element at position (2,1)
* @param e22 element at position (2,2)
* @param e23 element at position (2,3)
* @param e31 element at position (3,1)
* @param e32 element at position (3,2)
* @param e33 element at position (3,3)
*/
public Matrix(float e11, float e12, float e13, float e21, float e22, float e23, float e31, float e32, float e33){
vals[I11] = e11;
vals[I12] = e12;
vals[I13] = e13;
vals[I21] = e21;
vals[I22] = e22;
vals[I23] = e23;
vals[I31] = e31;
vals[I32] = e32;
vals[I33] = e33;
}
/**
* Creates a Matrix with 6 specified entries
* The third column will always be [0 0 1]
* (row, column)
* @param a element at (1,1)
* @param b element at (1,2)
* @param c element at (2,1)
* @param d element at (2,2)
* @param e element at (3,1)
* @param f element at (3,2)
*/
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;
}
/**
* adds a matrix from this matrix and returns the results
* @param arg the matrix to subtract from this matrix
* @return a Matrix object
*/
public Matrix add(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;
}
/**
* 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
*/
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)
*/
@Override
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()
*/
@Override
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()
*/
@Override
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/kernel/geom/Matrix.java
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