WWMath unit test (NASAWorldWind#205)

Author: markpet49

test/gov/nasa/worldwind/util/WWMathTest.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2012 United States Government as represented by the Administrator of the
+ * National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ */
+
+package gov.nasa.worldwind.util;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import gov.nasa.worldwind.geom.Vec4;
+
+@RunWith(JUnit4.class)
+public class WWMathTest {
+
+    private static final double DELTA = 1e-9;
+
+    /**
+     * Test triangle normal computation
+     */
+    @Test
+    public void testParseTimeString() {
+        Vec4 v1 = new Vec4(26, 2, 1);
+        Vec4 v2 = new Vec4(26, 2, 13);
+        Vec4 v3 = new Vec4(12, -23, 13);
+        Vec4 expectedNormal = new Vec4(0.8725060159497201, -0.48860336893184325, 0.0);
+        Vec4 normal = WWMath.computeTriangleNormal(v1, v2, v3);
+        assertEquals("Normal computation 1 X", expectedNormal.x, normal.x, DELTA);
+        assertEquals("Normal computation 1 Y", expectedNormal.y, normal.y, DELTA);
+        assertEquals("Normal computation 1 Z", expectedNormal.z, normal.z, DELTA);
+
+        v1 = new Vec4(-12, 12, 26);
+        v2 = new Vec4(23, -23, 2);
+        v3 = new Vec4(13, 13, 13);
+        expectedNormal = new Vec4(0.4612242682795252, -0.1396190373706287, 0.8762298207398077);
+        normal = WWMath.computeTriangleNormal(v1, v2, v3);
+        assertEquals("Normal computation 2 X", expectedNormal.x, normal.x, DELTA);
+        assertEquals("Normal computation 2 Y", expectedNormal.y, normal.y, DELTA);
+        assertEquals("Normal computation 2 Z", expectedNormal.z, normal.z, DELTA);
+    }
+}