Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 2008 by Kevin Day.
*
* 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) 1999-2008 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2008 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:
* https://github.com/LibrePDF/OpenPDF
*/
package com.lowagie.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).
*/
private final float[] vals = new float[]{
1, 0, 0,
0, 1, 0,
0, 0, 1
};
/**
* constructs a new Matrix with identity.
*/
Matrix() {
}
/**
* Constructs a matrix that represents translation
*
* @param tx
* @param ty
*/
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
*/
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.
*
* @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
*/
@SuppressWarnings("Duplicates")
public Matrix multiply(Matrix by) {
Matrix result = new Matrix();
float[] a = vals;
float[] b = by.vals;
float[] c = result.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 result;
}
/**
* Subtracts a matrix from this matrix and returns the results
*
* @param arg the matrix to subtract from this matrix
* @return the resulting matrix
*/
public Matrix subtract(Matrix arg) {
Matrix result = new Matrix();
float[] a = vals;
float[] b = arg.vals;
float[] c = result.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 result;
}
/**
* 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() {
int result = 1;
for (float val : vals) {
result = 31 * result + Float.floatToIntBits(val);
}
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];
}
}
