OpenSpace/modules/exoplanets/exoplanetshelper.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2023                                                               *
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#include <modules/exoplanets/exoplanetshelper.h>

#include <modules/exoplanets/exoplanetsmodule.h>
#include <openspace/engine/globals.h>
#include <openspace/engine/moduleengine.h>
#include <openspace/util/spicemanager.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/fmt.h>
#include <ghoul/logging/logmanager.h>
#include <glm/gtx/quaternion.hpp>
#include <glm/gtx/transform.hpp>
#include <string_view>
#include <fstream>
#include <sstream>

namespace {
    constexpr std::string_view _loggerCat = "ExoplanetsModule";
} // namespace

namespace openspace::exoplanets {

bool isValidPosition(const glm::vec3& pos) {
    return !glm::any(glm::isnan(pos));
}

bool hasSufficientData(const ExoplanetDataEntry& p) {
    const glm::vec3 starPosition{ p.positionX , p.positionY, p.positionZ };

    bool validStarPosition = isValidPosition(starPosition);
    bool hasSemiMajorAxis = !std::isnan(p.a);
    bool hasOrbitalPeriod = !std::isnan(p.per);

    return validStarPosition && hasSemiMajorAxis && hasOrbitalPeriod;
}

glm::vec3 computeStarColor(float bv) {
    const ExoplanetsModule* module = global::moduleEngine->module<ExoplanetsModule>();
    const std::string bvColormapPath = module->bvColormapPath();

    std::ifstream colorMap(absPath(bvColormapPath), std::ios::in);

    if (!colorMap.good()) {
        LERROR(fmt::format(
            "Failed to open colormap data file: {}", absPath(bvColormapPath)
        ));
        return glm::vec3(0.f);
    }

    // Interpret the colormap cmap file
    std::string line;
    while (std::getline(colorMap, line)) {
        if (line.empty() || (line[0] == '#')) {
            continue;
        }
        break;
    }

    // The first line is the width of the image, i.e number of values
    std::istringstream ss(line);
    int nValues;
    ss >> nValues;

    // Find the line matching the input B-V value (B-V is in [-0.4,2.0])
    const int t = static_cast<int>(round(((bv + 0.4) / (2.0 + 0.4)) * (nValues - 1)));
    std::string color;
    for (int i = 0; i < t + 1; i++) {
        getline(colorMap, color);
    }
    colorMap.close();

    std::istringstream colorStream(color);
    float r, g, b;
    colorStream >> r >> g >> b;

    return glm::vec3(r, g, b);
}

glm::dmat4 computeOrbitPlaneRotationMatrix(float i, float bigom, float omega) {
    // Exoplanet defined inclination changed to be used as Kepler defined inclination
    const glm::dvec3 ascendingNodeAxisRot = glm::dvec3(0.0, 0.0, 1.0);
    const glm::dvec3 inclinationAxisRot = glm::dvec3(1.0, 0.0, 0.0);
    const glm::dvec3 argPeriapsisAxisRot = glm::dvec3(0.0, 0.0, 1.0);

    const double asc = glm::radians(bigom);
    const double inc = glm::radians(i);
    const double per = glm::radians(omega);

    const glm::dmat4 orbitPlaneRotation =
        glm::rotate(asc, glm::dvec3(ascendingNodeAxisRot)) *
        glm::rotate(inc, glm::dvec3(inclinationAxisRot)) *
        glm::rotate(per, glm::dvec3(argPeriapsisAxisRot));

    return orbitPlaneRotation;
}

glm::dmat3 computeSystemRotation(glm::dvec3 starPosition) {
    const glm::dvec3 sunPosition = glm::dvec3(0.0, 0.0, 0.0);
    const glm::dvec3 starToSunVec = glm::normalize(sunPosition - starPosition);
    const glm::dvec3 galacticNorth = glm::dvec3(0.0, 0.0, 1.0);

    const glm::dmat3 galacticToCelestialMatrix =
        SpiceManager::ref().positionTransformMatrix("GALACTIC", "J2000", 0.0);

    const glm::dvec3 celestialNorth = glm::normalize(
        galacticToCelestialMatrix * galacticNorth
    );

    // Earth's north vector projected onto the skyplane, the plane perpendicular to the
    // viewing vector (starToSunVec)
    const float celestialAngle = static_cast<float>(glm::dot(
        celestialNorth,
        starToSunVec
    ));
    glm::dvec3 northProjected = glm::normalize(
        celestialNorth - (celestialAngle / glm::length(starToSunVec)) * starToSunVec
    );

    const glm::dvec3 beta = glm::normalize(glm::cross(starToSunVec, northProjected));

    return glm::dmat3(
        northProjected.x,
        northProjected.y,
        northProjected.z,
        beta.x,
        beta.y,
        beta.z,
        starToSunVec.x,
        starToSunVec.y,
        starToSunVec.z
    );
}

std::string createIdentifier(std::string name) {
    std::replace(name.begin(), name.end(), ' ', '_');
    std::replace(name.begin(), name.end(), '.', '-');
    sanitizeNameString(name);
    return name;
}

void sanitizeNameString(std::string& s) {
    // We want to avoid quotes and apostrophes in names, since they cause problems
    // when a string is translated to a script call
    s.erase(remove(s.begin(), s.end(), '\"'), s.end());
    s.erase(remove(s.begin(), s.end(), '\''), s.end());
}

} // namespace openspace::exoplanets