#pragma region CPL License
/*
Nuclex Native Framework
Copyright (C) 2002-2015 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) 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
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#pragma endregion // CPL License

// If the library is compiled as a DLL, this ensures symbols are exported
#define NUCLEX_GEOMETRY_SOURCE 1

#include "Nuclex/Geometry/Areas/Triangle2.h"
#include <gtest/gtest.h>

namespace Nuclex { namespace Geometry { namespace Areas {

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, ParameterConstructorAssignsValues) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );

    EXPECT_EQ(1.1f, triangle.A.X);
    EXPECT_EQ(2.2f, triangle.A.Y);
    EXPECT_EQ(3.3f, triangle.B.X);
    EXPECT_EQ(9.9f, triangle.B.Y);
    EXPECT_EQ(5.5f, triangle.C.X);
    EXPECT_EQ(1.1f, triangle.C.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, CenterOfTriangleCanBeDetermined) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );

    Point2<float> center = triangle.GetCenter();
    EXPECT_EQ(3.3f, center.X);
    EXPECT_EQ(4.4f, center.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, TriangleSurfaceAreaCanBeCalculated) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );

    EXPECT_FLOAT_EQ(18.149998886345646f, triangle.GetArea());
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, TrianglePerimeterCanBeCalculated) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );

    EXPECT_FLOAT_EQ(21.614368f, triangle.GetPerimeter());
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, TrianglesCanBeShiftedByCoordinates) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );
    triangle.ShiftBy(10.0f, 100.0f);

    EXPECT_EQ(11.1f, triangle.A.X);
    EXPECT_EQ(102.2f, triangle.A.Y);
    EXPECT_EQ(13.3f, triangle.B.X);
    EXPECT_EQ(109.9f, triangle.B.Y);
    EXPECT_EQ(15.5f, triangle.C.X);
    EXPECT_EQ(101.1f, triangle.C.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, TrianglesCanBeShiftedByVectors) {
    Triangle2<float> triangle(
      Point2<float>(1.1f, 2.2f), Point2<float>(3.3f, 9.9f), Point2<float>(5.5f, 1.1f)
    );
    triangle.ShiftBy(Vector2<float>(100.0f, 10.0f));

    EXPECT_EQ(101.1f, triangle.A.X);
    EXPECT_EQ(12.2f, triangle.A.Y);
    EXPECT_EQ(103.3f, triangle.B.X);
    EXPECT_EQ(19.9f, triangle.B.Y);
    EXPECT_EQ(105.5f, triangle.C.X);
    EXPECT_EQ(11.1f, triangle.C.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, CircumcenterOfTrianglesCanBeDetermined) {
    Triangle2<float> triangle(
      Point2<float>(-10.0f, -10.0f), Point2<float>(10.0f, -10.0f), Point2<float>(0.0f, 10.0f)
    );

    Point2<float> circumcenter = triangle.GetCircumcenter();
    EXPECT_FLOAT_EQ(0.0f, circumcenter.X);
    EXPECT_FLOAT_EQ(-2.5f, circumcenter.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, CircumcenterOfFlatTrianglesIsValid) {
    Triangle2<float> triangle(
      Point2<float>(-10.0f, -10.0f), Point2<float>(9.0f, 9.0f), Point2<float>(10.0f, 10.0f)
    );

    Point2<float> circumcenter = triangle.GetCircumcenter();
    EXPECT_FLOAT_EQ(0.0f, circumcenter.X);
    EXPECT_FLOAT_EQ(0.0f, circumcenter.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, IncenterOfTrianglesCanBeDetermined) {
    Triangle2<float> triangle(
      Point2<float>(-10.0f, -10.0f), Point2<float>(10.0f, -10.0f), Point2<float>(0.0f, 10.0f)
    );

    Point2<float> incenter = triangle.GetIncenter();
    EXPECT_FLOAT_EQ(0.0f, incenter.X);
    EXPECT_FLOAT_EQ(-3.81966f, incenter.Y);
  }

  // ------------------------------------------------------------------------------------------- //

  TEST(Triangle2Test, IncenterOfFlatTrianglesIsValid) {
    Triangle2<float> triangle(
      Point2<float>(9.0f, 9.0f), Point2<float>(-10.0f, -10.0f), Point2<float>(10.0f, 10.0f)
    );

    Point2<float> incenter = triangle.GetIncenter();
    EXPECT_FLOAT_EQ(9.0f, incenter.X);
    EXPECT_FLOAT_EQ(9.0f, incenter.Y);
  }

  // ------------------------------------------------------------------------------------------- //

}}} // namespace Nuclex::Geometry::Areas