File: Sort.cpp

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// The MIT License (MIT)
//
// Copyright (c) 2018-2021 www.open3d.org
//
// 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 "tests/test_utility/Sort.h"

#include <algorithm>

#include "open3d/utility/Logging.h"
#include "tests/Tests.h"

namespace open3d {
namespace tests {

TEST(Sort, Sort) {
    std::vector<Eigen::Vector3d> points{
            {3, 3, 3},
            {1, 1, 1},
            {0, 0, 0},
            {2, 2, 2},
    };
    std::vector<Eigen::Vector3d> sorted_points{
            {0, 0, 0},
            {1, 1, 1},
            {2, 2, 2},
            {3, 3, 3},
    };
    ExpectEQ(Sort(points), sorted_points);
}

TEST(Sort, SortWithIndices) {
    std::vector<Eigen::Vector3d> points{
            {3, 3, 3},
            {1, 1, 1},
            {0, 0, 0},
            {2, 2, 2},
    };
    std::vector<Eigen::Vector3d> sorted_points{
            {0, 0, 0},
            {1, 1, 1},
            {2, 2, 2},
            {3, 3, 3},
    };
    std::vector<size_t> indices{2, 1, 3, 0};
    ExpectEQ(SortWithIndices(points).first, sorted_points);
    EXPECT_EQ(SortWithIndices(points).second, indices);
}

TEST(Sort, GetIndicesAToB) {
    std::vector<Eigen::Vector3d> a{
            {3, 3, 3},
            {1, 1, 1},
            {0, 0, 0},
            {2, 2, 2},
    };
    std::vector<Eigen::Vector3d> b{
            {2, 2, 2},
            {0, 0, 0},
            {1, 1, 1},
            {3, 3, 3},
    };
    ExpectEQ(ApplyIndices(a, GetIndicesAToB(a, a)), a);
    ExpectEQ(ApplyIndices(b, GetIndicesAToB(b, b)), b);
    ExpectEQ(ApplyIndices(a, GetIndicesAToB(a, b)), b);
    ExpectEQ(ApplyIndices(b, GetIndicesAToB(b, a)), a);
}

TEST(Sort, GetIndicesAToBClose) {
    std::vector<Eigen::Vector3d> a{
            {3, 3, 3},
            {1, 1, 1},
            {4, 4, 4},
            {2, 2, 2},
    };
    std::vector<Eigen::Vector3d> b{
            {2.00001, 2.00001, 2},
            {4, 4.00001, 4},
            {1.00001, 1, 1.00001},
            {3, 3, 3.00001},
    };
    double threshold = 0.001;
    ExpectEQ(ApplyIndices(a, GetIndicesAToB(a, a, threshold)), a, threshold);
    ExpectEQ(ApplyIndices(b, GetIndicesAToB(b, b, threshold)), b, threshold);
    ExpectEQ(ApplyIndices(a, GetIndicesAToB(a, b, threshold)), b, threshold);
    ExpectEQ(ApplyIndices(b, GetIndicesAToB(b, a, threshold)), a, threshold);
}

}  // namespace tests
}  // namespace open3d