cpp-game-engine/math/test/common_test.cxx

//
//  common_test.cxx
//  math-test
//
//  Created by Sam Jaffe on 5/5/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#include <cmath>
#include <gmock/gmock.h>

#include "game/math/angle.hpp"
#include "game/math/common.hpp"
#include "game/math/shape.hpp"

#include "test_printers.h"

using namespace math::dim2;

struct UnitCircleTest : testing::TestWithParam<point> {};

TEST_P(UnitCircleTest, PointExistsInCircle) {
  circle unit{{{0, 0}}, 1};
  EXPECT_TRUE(math::contains(unit, GetParam()));
}

TEST_P(UnitCircleTest, PointExistsOutsideCircle) {
  circle subunit{{{0, 0}}, 0.9999};
  EXPECT_FALSE(math::contains(subunit, GetParam()));
}

struct unit_circle_angle {
  using value_type = point;
  unit_circle_angle(int degrees) : degs({static_cast<double>(degrees)}) {}
  point operator*() const {
    return point(make_vector(math::sin(degs), math::cos(degs)));
  }
  unit_circle_angle & operator++() { ++degs.value; return *this; }
  math::degree degs;
};

std::vector<point> unit_circle_pts() {
  std::vector<point> rval;
  for (math::degree d{0.0}; d.value <= 360; d.value += 5.0) {
    rval.emplace_back(point(make_vector(math::sin(d), math::cos(d))));
  }
  return rval;
}

INSTANTIATE_TEST_CASE_P(LiesOnEdge, UnitCircleTest,
                        testing::ValuesIn(unit_circle_pts()));