Entities.hpp

//---- GPL ---------------------------------------------------------------------
//
// Copyright (C)  Stichting Deltares, 2011-2021.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation version 3.
//
// This program 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// contact: delft3d.support@deltares.nl
// Stichting Deltares
// P.O. Box 177
// 2600 MH Delft, The Netherlands
//
// All indications and logos of, and references to, "Delft3D" and "Deltares"
// are registered trademarks of Stichting Deltares, and remain the property of
// Stichting Deltares. All rights reserved.
//
//------------------------------------------------------------------------------
 
#pragma once
 
#include <vector>
 
#include "MeshKernel/Constants.hpp"
#include "MeshKernel/Definitions.hpp"
#include "MeshKernel/Exceptions.hpp"
#include "MeshKernel/Point.hpp"
 
namespace meshkernel
{
 
    // to re-enable when compiling with c++20 support
    // template <typename T>
    // concept IsCoordinate = requires(T t)
    //{
    //    t.x;
    //    t.y;
    //    t.IsValid
    //};
 
    using Edge = std::pair<UInt, UInt>;
 
    static bool IsValid(const UInt value)
    {
        return value != constants::missing::uintValue;
    }
 
    static bool IsValidEdge(const Edge& edge)
    {
        return IsValid(edge.first) && IsValid(edge.second);
    }
 
    using EdgeFaces = std::array<UInt, 2>;
 
    static UInt Neighbour(const EdgeFaces& edge, const UInt elementId)
    {
        return edge[0] == elementId ? edge[1] : edge[0];
    }
 
    UInt static OtherNodeOfEdge(const Edge& edge, UInt node)
    {
        return node == edge.first ? edge.second : edge.first;
    }
 
    static UInt EdgeNodeIndex(const Edge& edge, UInt position)
    {
        if (position == 0)
        {
            return edge.first;
        }
        else if (position == 1)
        {
            return edge.second;
        }
        else
        {
            throw ConstraintError("Position out of bounds: {} not in [0 .. 1]", position);
        }
    }
 
    class Sample : public Point
    {
    public:
        double value = constants::missing::doubleValue; 
 
        Sample() = default;
 
        Sample(double x, double y, double value)
            : Point(x, y),
              value(value)
        {
        }
 
        static auto ConvertToSamples(int numSamples, const double** samplesXCoordinate,
                                     const double** samplesYCoordinate,
                                     const double** samplesValue)
        {
            // Build the samples
            std::vector<Sample> samples(numSamples);
            for (UInt i = 0; i < samples.size(); ++i)
            {
                samples[i].x = (*samplesXCoordinate)[i];
                samples[i].y = (*samplesYCoordinate)[i];
                samples[i].value = (*samplesValue)[i];
            }
            return samples;
        }
 
        [[nodiscard]] bool IsValid(const double missingValue = constants::missing::doubleValue) const
        {
            bool isInvalid = IsEqual(x, missingValue) ||
                             IsEqual(y, missingValue);
 
            return !isInvalid;
        }
    };
 
    static std::vector<Edge> ConvertToEdgeNodesVector(int numEdges, const int* const edge_nodes)
    {
        std::vector<Edge> edges(numEdges);
 
        int ei = 0;
        for (auto e = 0; e < numEdges; e++)
        {
            edges[e].first = edge_nodes[ei];
            ei++;
            edges[e].second = edge_nodes[ei];
            ei++;
        }
        return edges;
    }
 
    static std::vector<Point> ConvertToNodesVector(int numNodes,
                                                   const double* const node_x,
                                                   const double* const node_y)
    {
        std::vector<Point> nodes(numNodes);
        for (auto n = 0; n < numNodes; n++)
        {
            nodes[n].x = node_x[n];
            nodes[n].y = node_y[n];
        }
        return nodes;
    }
 
    static std::tuple<int, double*, double*> ConvertFromNodesVector(const std::vector<Point>& nodes);
 
    static std::vector<Point> ConvertToFaceCentersVector(int numFaces,
                                                         const double* const facex,
                                                         const double* const facey)
    {
        std::vector<Point> faceCenters(numFaces);
        for (auto n = 0; n < numFaces; n++)
        {
            faceCenters[n].x = facex[n];
            faceCenters[n].y = facey[n];
        }
        return faceCenters;
    }
 
    static std::vector<std::vector<UInt>> ConvertToFaceNodesVector(int num_faces,
                                                                   const int* const face_nodes,
                                                                   const int* const nodes_per_face)
    {
        std::vector<std::vector<UInt>> result;
        result.reserve(num_faces);
 
        std::vector<UInt> nodes;
        UInt index = 0;
        for (auto f = 0; f < num_faces; f++)
        {
            nodes.clear();
            for (auto n = 0; n < nodes_per_face[f]; n++)
            {
                nodes.emplace_back(static_cast<UInt>(face_nodes[index]));
                index++;
            }
            result.emplace_back(nodes);
        }
        return result;
    }
 
} // namespace meshkernel