//Fl_Canvas.cpp

#include <FL/Fl_Box.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/fl_message.H>
#include <string>

class Fl_Canvas : public Fl_Box {
    public:
    Fl_Canvas(Fl_Boxtype b, int X, int Y, int W, int H) : Fl_Box(b, X, Y, W, H, "")
    {
    };

    void add_image(const char* _image) //Реализация метода
    {
        Fl_Shared_Image* img = Fl_Shared_Image::get(_image);
        image(img);
        fl_message("complite");
        redraw();
    }

};