clipping_plane.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_RENDERER_CLIPPING_PLANE_H
#define EASY3D_RENDERER_CLIPPING_PLANE_H
 
#include <easy3d/core/types.h>
 
namespace easy3d {
 
    class Camera;
    class ShaderProgram;
    class Manipulator;

    class ClippingPlane {
    public:
        ClippingPlane();
        virtual ~ClippingPlane();

        static ClippingPlane* instance();

        bool is_enabled() const { return enabled_; }
        void set_enabled(bool b) { enabled_ = b; }

        void fit_scene(const vec3 &center, float radius);

        vec3 center() const;
        vec3 normal() const;

        Plane3 plane0() const;
        Plane3 plane1() const;

        bool is_visible() const { return visible_; }
        void set_visible(bool v) { visible_ = v; }

        const vec4& color() const { return color_; }
        void set_color(const vec4& c) { color_ = c; }

        bool cross_section() const { return cross_section_; }
        void set_cross_section(bool b) { cross_section_ = b; }

        float cross_section_width() const { return cross_section_width_; }
        void set_cross_section_width(float w) { cross_section_width_ = w; }

        void set_program(ShaderProgram *program) const;
        void set_discard_primitives(ShaderProgram *program, bool plane_clipping_discard) const;

        void draw(const Camera* cam) const;

        virtual Manipulator *manipulator() { return manipulator_; }
        virtual const Manipulator *manipulator() const { return manipulator_; }
 
    protected:
        Manipulator *manipulator_;
        bool enabled_;
        bool visible_;
        vec4 color_;
        bool cross_section_;
        float cross_section_width_;
        float scene_radius_;
    };
 
}
 
#endif // EASY3D_RENDERER_CLIPPING_PLANE_H