jme3-core: test the com.jme3.math.Triangle class

jme3-core/src/test/java/com/jme3/math/TriangleTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2022 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * 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.
+ *
+ * * Neither the name of 'jMonkeyEngine' 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 COPYRIGHT OWNER 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 ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.math;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Verifies that the {@link Triangle} class works correctly.
+ *
+ * @author Stephen Gold [email protected]
+ */
+public class TriangleTest {
+    /**
+     * Basic functionality of a Triangle.
+     */
+    @Test
+    public void test1() {
+        Triangle triangle1 = new Triangle(
+                new Vector3f(1f, 2f, 3f),
+                new Vector3f(6f, 5f, 4f),
+                new Vector3f(5f, 8f, 2f)
+        );
+
+        // Verify that centroid and normal are calculated correctly.
+        Vector3f c1 = triangle1.getCenter();
+        Assert.assertEquals(4f, c1.x, 1e-6f);
+        Assert.assertEquals(5f, c1.y, 1e-6f);
+        Assert.assertEquals(3f, c1.z, 1e-6f);
+
+        Vector3f n1 = triangle1.getNormal();
+        Assert.assertEquals(-0.408248, n1.x, 1e-6f);
+        Assert.assertEquals(0.408248, n1.y, 1e-6f);
+        Assert.assertEquals(0.816497, n1.z, 1e-6f);
+
+        // Clone triangle1 and verify its vertices.
+        Triangle triangle2 = triangle1.clone();
+        Assert.assertTrue(triangle1 != triangle2);
+        Assert.assertEquals(triangle1.get1(), triangle2.get1());
+        Assert.assertEquals(triangle1.get2(), triangle2.get2());
+        Assert.assertEquals(triangle1.get3(), triangle2.get3());
+
+        // Modify triangle1 and verify its new centroid.
+        triangle1.set1(new Vector3f(-2f, -1f, 0f));
+        c1 = triangle1.getCenter();
+        Assert.assertEquals(3f, c1.x, 1e-6f);
+        Assert.assertEquals(4f, c1.y, 1e-6f);
+        Assert.assertEquals(2f, c1.z, 1e-6f);
+
+        // Verify that triangle2's centroid and normal are (still) correct.
+        Vector3f c2 = triangle2.getCenter();
+        Assert.assertEquals(4f, c2.x, 1e-6f);
+        Assert.assertEquals(5f, c2.y, 1e-6f);
+        Assert.assertEquals(3f, c2.z, 1e-6f);
+
+        Vector3f n2 = triangle2.getNormal();
+        Assert.assertEquals(-0.408248, n2.x, 1e-6f);
+        Assert.assertEquals(0.408248, n2.y, 1e-6f);
+        Assert.assertEquals(0.816497, n2.z, 1e-6f);
+    }
+}