ColorMap.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "visualization/utility/ColorMap.h"
 
#include <Logging.h>
 
namespace cloudViewer {
 
namespace {
using namespace visualization;
 
class GlobalColorMapSingleton {
private:
    GlobalColorMapSingleton() : color_map_(new ColorMapJet) {
        utility::LogDebug("Global colormap init.");
    }
    GlobalColorMapSingleton(const GlobalColorMapSingleton &) = delete;
    GlobalColorMapSingleton &operator=(const GlobalColorMapSingleton &) =
            delete;
 
public:
    ~GlobalColorMapSingleton() {
        utility::LogDebug("Global colormap destruct.");
    }
 
public:
    static GlobalColorMapSingleton &GetInstance() {
        static GlobalColorMapSingleton singleton;
        return singleton;
    }
 
public:
    std::shared_ptr<const ColorMap> color_map_;
};
 
}  // unnamed namespace
 
namespace visualization {
Eigen::Vector3d ColorMapGray::GetColor(double value) const {
    return Eigen::Vector3d(value, value, value);
}
 
Eigen::Vector3d ColorMapJet::GetColor(double value) const {
    return Eigen::Vector3d(JetBase(value * 2.0 - 1.5),   // red
                           JetBase(value * 2.0 - 1.0),   // green
                           JetBase(value * 2.0 - 0.5));  // blue
}
 
Eigen::Vector3d ColorMapSummer::GetColor(double value) const {
    return Eigen::Vector3d(Interpolate(value, 0.0, 0.0, 1.0, 1.0),
                           Interpolate(value, 0.5, 0.0, 1.0, 1.0), 0.4);
}
 
Eigen::Vector3d ColorMapWinter::GetColor(double value) const {
    return Eigen::Vector3d(0.0, Interpolate(value, 0.0, 0.0, 1.0, 1.0),
                           Interpolate(value, 1.0, 0.0, 0.5, 1.0));
}
 
Eigen::Vector3d ColorMapHot::GetColor(double value) const {
    Eigen::Vector3d edges[4] = {
            Eigen::Vector3d(1.0, 1.0, 1.0),
            Eigen::Vector3d(1.0, 1.0, 0.0),
            Eigen::Vector3d(1.0, 0.0, 0.0),
            Eigen::Vector3d(0.0, 0.0, 0.0),
    };
    if (value < 0.0) {
        return edges[0];
    } else if (value < 1.0 / 3.0) {
        return Interpolate(value, edges[0], 0.0, edges[1], 1.0 / 3.0);
    } else if (value < 2.0 / 3.0) {
        return Interpolate(value, edges[1], 1.0 / 3.0, edges[2], 2.0 / 3.0);
    } else if (value < 1.0) {
        return Interpolate(value, edges[2], 2.0 / 3.0, edges[3], 1.0);
    } else {
        return edges[3];
    }
}
 
const std::shared_ptr<const ColorMap> GetGlobalColorMap() {
    return GlobalColorMapSingleton::GetInstance().color_map_;
}
 
void SetGlobalColorMap(ColorMap::ColorMapOption option) {
    switch (option) {
        case ColorMap::ColorMapOption::Gray:
            GlobalColorMapSingleton::GetInstance().color_map_.reset(
                    new ColorMapGray);
            break;
        case ColorMap::ColorMapOption::Summer:
            GlobalColorMapSingleton::GetInstance().color_map_.reset(
                    new ColorMapSummer);
            break;
        case ColorMap::ColorMapOption::Winter:
            GlobalColorMapSingleton::GetInstance().color_map_.reset(
                    new ColorMapWinter);
            break;
        case ColorMap::ColorMapOption::Hot:
            GlobalColorMapSingleton::GetInstance().color_map_.reset(
                    new ColorMapHot);
            break;
        case ColorMap::ColorMapOption::Jet:
        default:
            GlobalColorMapSingleton::GetInstance().color_map_.reset(
                    new ColorMapJet);
            break;
    }
}
 
}  // namespace visualization
}  // namespace cloudViewer