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/******************************************************************************
*
* Project: PROJ
* Purpose: Test pj_phi2 function.
* Author: Kurt Schwehr <schwehr@google.com>
*
******************************************************************************
* Copyright (c) 2018, Google Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "projects.h"
#include <cmath>
#include <limits>
#include "gtest_include.h"
namespace {
TEST(PjPhi2Test, Basic) {
projCtx ctx = pj_get_default_ctx();
EXPECT_DOUBLE_EQ(M_PI_2, pj_phi2(ctx, 0.0, 0.0));
EXPECT_DOUBLE_EQ(0.0, pj_phi2(ctx, 1.0, 0.0));
EXPECT_DOUBLE_EQ(M_PI_2, pj_phi2(ctx, 0.0, 1.0));
EXPECT_DOUBLE_EQ(M_PI, pj_phi2(ctx, -1.0, 0.0));
EXPECT_DOUBLE_EQ(M_PI_2, pj_phi2(ctx, 0.0, -1.0));
EXPECT_DOUBLE_EQ(0.0, pj_phi2(ctx, 1.0, 1.0));
EXPECT_DOUBLE_EQ(M_PI, pj_phi2(ctx, -1.0, -1.0));
// TODO(schwehr): M_PI_4, M_PI_2, M_PI, M_E
// https://www.gnu.org/software/libc/manual/html_node/Mathematical-Constants.html
EXPECT_DOUBLE_EQ(-0.95445818456292697, pj_phi2(ctx, M_PI, 0.0));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, 0.0, M_PI)));
EXPECT_DOUBLE_EQ(4.0960508381527205, pj_phi2(ctx, -M_PI, 0.0));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, 0.0, -M_PI)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, M_PI, M_PI)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, -M_PI, -M_PI)));
}
TEST(PjPhi2Test, AvoidUndefinedBehavior) {
auto ctx = pj_get_default_ctx();
constexpr auto nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_TRUE(std::isnan(pj_phi2(ctx, nan, 0.0)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, 0.0, nan)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, nan, nan)));
// We do not really care about the values that follow.
constexpr auto inf = std::numeric_limits<double>::infinity();
EXPECT_DOUBLE_EQ(-M_PI_2, pj_phi2(ctx, inf, 0.0));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, 0.0, inf)));
EXPECT_DOUBLE_EQ(4.7123889803846897, pj_phi2(ctx, -inf, 0.0));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, 0.0, -inf)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, inf, inf)));
EXPECT_TRUE(std::isnan(pj_phi2(ctx, -inf, -inf)));
}
} // namespace
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