#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/Tracers/Triangle2Tracer.h"
#include <gtest/gtest.h>

namespace Nuclex { namespace Geometry { namespace Areas { namespace Tracers {

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

  TEST(Triangle2TracerTest, EntryAndExitThroughTriangleAreDetected) {
    Triangle2<float> triangle(
      Point2<float>(5.0f, 5.0f), Point2<float>(5.0f, -5.0f), Point2<float>(15.0f, -5.0f)
    );
    Lines::Line2<float> trace(Point2<float>(-10.0f, 0.0f), Vector2<float>::Right);

    LineContacts<float> contacts = Triangle2Tracer<float>::FindLineContacts(
      trace, triangle
    );

    EXPECT_EQ(15.0f, contacts.EntryTime);
    EXPECT_EQ(20.0f, contacts.ExitTime);
  }

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

  TEST(Triangle2TracerTest, EntryBeforeLineOriginIsDetected) {
    Triangle2<float> triangle(
      Point2<float>(5.0f, 5.0f), Point2<float>(5.0f, -5.0f), Point2<float>(15.0f, -5.0f)
    );
    Lines::Line2<float> trace(Point2<float>(7.5f, 0.0f), Vector2<float>::Right);

    LineContacts<float> contacts = Triangle2Tracer<float>::FindLineContacts(
      trace, triangle
    );

    EXPECT_EQ(-2.5f, contacts.EntryTime);
    EXPECT_EQ(2.5f, contacts.ExitTime);
  }

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

  TEST(Triangle2TracerTest, LineMissingTriangleIsIgnored) {
    Triangle2<float> triangle(
      Point2<float>(5.0f, 5.0f), Point2<float>(5.0f, -5.0f), Point2<float>(15.0f, -5.0f)
    );
    Lines::Line2<float> trace(
      Point2<float>(6.0f, 6.0f), Vector2<float>::Normalize(Vector2<float>(1.0f, -1.0f))
    );

    LineContacts<float> contacts = Triangle2Tracer<float>::FindLineContacts(
      trace, triangle
    );

    EXPECT_TRUE(contacts.HasMissed());
  }

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

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