/homes/esi30/DCS339/coursework/src/Processes/select_roi.cpp

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#include <memory>
#include <tuple>
#include <string>

#include <gtkmm/image.h>
#include <gtkmm/messagedialog.h>

#include "../display_unit.hpp"
#include "../processing_page.hpp"
#include "../processing_unit.hpp"
#include "../utils.hpp"

namespace{
    Display_unit *impl(const Image_unit *in){
        if(in->has_roi()){
            Gtk::MessageDialog d("Region of interest already in selection. Unselect first.");
            d.run();
            return nullptr;
        }

        std::tuple<int,int,int,int> zone=in->selection();

        if(std::get<0>(zone)<0 || std::get<1>(zone)<0 || std::get<2>(zone)<0 || std::get<3>(zone)<0){
            Gtk::MessageDialog d("No selection avaible, please select a zone first. See help for more informations.");
            d.run();
            return nullptr;
        }

        if(std::get<0>(zone)+std::get<2>(zone)>static_cast<int>(in->height()) || std::get<1>(zone)+std::get<3>(zone)>static_cast<int>(in->width())){
            Gtk::MessageDialog d("Selection error. Please, reselect. See help for more informations.");
            d.run();
            return nullptr;
        }

        Image_unit *out=new Image_unit(*in);
        out->clip(std::get<0>(zone),  std::get<1>(zone),  std::get<2>(zone),  std::get<3>(zone));
        return out;
    }
}

namespace Processes{
    void select_roi(){
        Gtk::Image icon(cmake_install_prefix+std::string("/share/egami/icons/select_roi.png"));
        std::shared_ptr<Processing_unit> pu(new Processing_unit(Processing(&impl), "Select ROI", icon, false));
        Processing_page::add_unit_to_page("Tools", pu);
    }
}