MatrixTest.java

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2025 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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    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
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 */
package com.itextpdf.kernel.geom;

import com.itextpdf.test.ExtendedITextTest;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Tag;

@Tag("UnitTest")
public class MatrixTest extends ExtendedITextTest {

    @Test
    public void testMultiply() {
        Matrix m1 = new Matrix(2, 3, 4, 5, 6, 7);
        Matrix m2 = new Matrix(8, 9, 10, 11, 12, 13);
        Matrix shouldBe = new Matrix(46, 51, 82, 91, 130, 144);

        Matrix rslt = m1.multiply(m2);
        Assertions.assertEquals(shouldBe, rslt);
    }

    @Test
    public void testDeterminant(){
        Matrix m = new Matrix(2, 3, 4, 5, 6, 7);
        Assertions.assertEquals(-2f, m.getDeterminant(), .001f);
    }

    @Test
    public void testSubtract() {
        Matrix m1 = new Matrix(1, 2, 3, 4, 5, 6);
        Matrix m2 = new Matrix(6, 5, 4, 3, 2, 1);
        Matrix shouldBe = new Matrix(-5, -3,0, -1, 1,0, 3, 5,0);

        Matrix rslt = m1.subtract(m2);
        Assertions.assertEquals(shouldBe, rslt);
    }

    @Test
    public void testAdd() {
        Matrix m1 = new Matrix(1, 2, 3, 4, 5, 6);
        Matrix m2 = new Matrix(6, 5, 4, 3, 2, 1);
        Matrix shouldBe = new Matrix(7, 7,0, 7, 7,0, 7, 7,2);

        Matrix rslt = m1.add(m2);
        Assertions.assertEquals(shouldBe, rslt);
    }

}