multi_viewer.h

/********************************************************************
 * Copyright (C) 2015 Liangliang Nan <liangliang.nan@gmail.com>
 * https://3d.bk.tudelft.nl/liangliang/
 *
 * This file is part of Easy3D. If it is useful in your research/work,
 * I would be grateful if you show your appreciation by citing it:
 * ------------------------------------------------------------------
 *      Liangliang Nan.
 *      Easy3D: a lightweight, easy-to-use, and efficient C++ library
 *      for processing and rendering 3D data.
 *      Journal of Open Source Software, 6(64), 3255, 2021.
 * ------------------------------------------------------------------
 *
 * Easy3D is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 3
 * as published by the Free Software Foundation.
 *
 * Easy3D 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/>.
 ********************************************************************/
 
#ifndef EASY3D_VIEWER_MULTI_VIEWER_H
#define EASY3D_VIEWER_MULTI_VIEWER_H
 
#include <easy3d/viewer/viewer.h>
 
 
namespace easy3d {
 
    class Model;
    class Drawable;
    class ShaderProgram;
    class VertexArrayObject;
 
    class MultiViewer : public Viewer {
    public:
        MultiViewer(int rows, int cols, const std::string &title = "untitled");
        ~MultiViewer() override;
 
        void assign(int row, int col, const Model *m);
 
        void assign(int row, int col, const Drawable *d);
 
        void set_division_visible(bool b) { division_visible_ = b; }
 
        bool division_visible() const { return division_visible_; }
 
        vec3 point_under_pixel(int x, int y, bool &found) const override;
 
    protected:
        void init() override;
        void post_resize(int w, int h) override;
        void draw() const override;
 
        // overloaded, so mouse positions are relative to the current view
        bool mouse_press_event(int x, int y, int button, int modifiers) override;
        // overloaded, so mouse positions are relative to the current view
        bool mouse_release_event(int x, int y, int button, int modifiers) override;
        // overloaded, so mouse positions are relative to the current view
        bool mouse_drag_event(int x, int y, int dx, int dy, int button, int modifiers) override;
 
        void draw_division() const;
        void update_division();
 
    private:
        int num_rows_;
        int num_cols_;
        // A sub-view of the multi-view viewer.
        struct View {
            std::vector<const Model *> models;        // the models to show in this view
            std::vector<const Drawable *> drawables;  // the drawables to show in this view
            ivec4 viewport;
        };
        std::vector<std::vector<View> > views_;
        VertexArrayObject *division_vao_;
        ShaderProgram *lines_program_;
        unsigned int division_vertex_buffer_;
        bool division_visible_;
 
        int view_width_;    // the width of the views
        int view_height_;   // the height of the views
    };
 
}
 
#endif // EASY3D_VIEWER_MULTI_VIEWER_H