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Gems/LmbrCentral/Code/Tests/ShapeGeometryUtilTest.cpp

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+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+
+#include "LmbrCentral_precompiled.h"
+#include <AzTest/AzTest.h>
+
+#include <AzCore/Component/ComponentApplication.h>
+#include <Shape/ShapeGeometryUtil.h>
+#include <AzCore/UnitTest/TestTypes.h>
+#include <AzCore/Math/Vector3.h>
+
+namespace UnitTest
+{
+    class ShapeGeometryUtilTest
+        : public AllocatorsFixture
+    {
+    public:
+        AZStd::unique_ptr<AZ::SerializeContext> m_serializeContext;
+
+        void SetUp() override
+        {
+            AllocatorsFixture::SetUp();
+            m_serializeContext = AZStd::make_unique<AZ::SerializeContext>();
+        }
+
+        void TearDown() override
+        {
+            m_serializeContext.reset();
+            AllocatorsFixture::TearDown();
+        }
+    };
+
+    // ccw
+    TEST_F(ShapeGeometryUtilTest, GenerateTrianglesCCW)
+    {
+        AZStd::vector<AZ::Vector3> triangles = 
+            LmbrCentral::GenerateTriangles(
+            {
+                AZ::Vector2(0.0f, 0.0f), AZ::Vector2(1.0f, 0.0f),
+                AZ::Vector2(1.0f, 1.0f), AZ::Vector2(0.0f, 1.0f) 
+            }
+        );
+
+        EXPECT_TRUE(triangles.size() == 6);
+    }
+
+    // cw
+    TEST_F(ShapeGeometryUtilTest, GenerateTrianglesCW)
+    {
+        AZStd::vector<AZ::Vector3> triangles =
+            LmbrCentral::GenerateTriangles(
+            {
+                AZ::Vector2(0.0f, 0.0f), AZ::Vector2(0.0f, 1.0f),
+                AZ::Vector2(1.0f, 1.0f), AZ::Vector2(1.0f, 0.0f)
+            }
+        );
+
+        EXPECT_TRUE(triangles.size() == 6);
+    }
+
+    // non-simple
+    TEST_F(ShapeGeometryUtilTest, GenerateTrianglesFailureNonSimple)
+    {
+        AZStd::vector<AZ::Vector3> triangles =
+            LmbrCentral::GenerateTriangles(
+            {
+                AZ::Vector2(0.0f, -2.0f), AZ::Vector2(2.0f, -2.0f),
+                AZ::Vector2(2.0f, 1.0f), AZ::Vector2(4.0f, 1.0f)
+            }
+        );
+
+        EXPECT_TRUE(triangles.size() == 0);
+    }
+
+    // simple-concave
+    TEST_F(ShapeGeometryUtilTest, GenerateTrianglesSimpleConcave)
+    {
+        AZStd::vector<AZ::Vector3> triangles =
+            LmbrCentral::GenerateTriangles(
+            {
+                AZ::Vector2(1.0f, -1.0f), AZ::Vector2(0.0f, -2.0f),
+                AZ::Vector2(1.0f, -2.0f), AZ::Vector2(2.0f, -2.0f),
+                AZ::Vector2(2.0f, 0.0f), AZ::Vector2(2.0f, 1.0f),
+                AZ::Vector2(1.0f, 0.0f), AZ::Vector2(-1.0f, 0.0f)
+            }
+        );
+
+        EXPECT_TRUE(triangles.size() == 18);
+    }
+}