ray_picker.h

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/*
 *  OGF/Graphite: Geometry and Graphics Programming Library + Utilities
 *  Copyright (C) 2000 Bruno Levy
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  If you modify this software, you should include a notice giving the
 *  name of the person performing the modification, the date of modification,
 *  and the reason for such modification.
 *
 *  Contact: Bruno Levy
 *
 *     levy@loria.fr
 *
 *     ISA Project
 *     LORIA, INRIA Lorraine,
 *     Campus Scientifique, BP 239
 *     54506 VANDOEUVRE LES NANCY CEDEX
 *     FRANCE
 *
 *  Note that the GNU General Public License does not permit incorporating
 *  the Software into proprietary programs.
 */
 
 
#ifndef H_OGF_SCENE_GRAPH_GFX_TRANSFORMS_RAY_PICKER_H
#define H_OGF_SCENE_GRAPH_GFX_TRANSFORMS_RAY_PICKER_H
 
#include <OGF/scene_graph_gfx/common/common.h>
#include <OGF/gom/types/node.h>
#include <OGF/basic/math/geometry.h>
 
namespace OGF {
 
    class RenderingContext;
 
    /**************************************************************************/
 
    struct RayPick {
    public:
 
        RayPick(const vec2& p_ndc_in, int btn_in) :
            p_ndc(p_ndc_in),
            button(btn_in) {
        }
 
        RayPick() {
        }
 
        vec2 p_ndc;
 
        int button;
    };
 
    SCENE_GRAPH_GFX_API std::ostream& operator<<(
        std::ostream& out, const RayPick& ev
    );
 
    SCENE_GRAPH_GFX_API std::istream& operator>>(std::istream& in, RayPick& ev);
 
 
    gom_class SCENE_GRAPH_GFX_API RayPicker : public Object {
    public:
        RayPicker();
 
         ~RayPicker() override;
 
    gom_slots:
 
        void grab(
            RenderingContext* rendering_context,
            const vec2& point_ndc, int button
        );
 
        void drag(
            RenderingContext* rendering_context,
            const vec2& point_ndc, int button
        );
 
        void release(
            RenderingContext* rendering_context,
            const vec2& point_ndc, int button
        );
 
    gom_signals:
        void ray_grab(
            RenderingContext* rendering_context, const RayPick& value
        );
 
        void ray_drag(
            RenderingContext* rendering_context, const RayPick& value
        );
 
        void ray_release(
            RenderingContext* rendering_context, const RayPick& value
        );
 
    protected:
        RayPick point_to_ray_pick(
            RenderingContext* context, const vec2& p_ndc, int button
        );
    };
 
    /*************************************************************************/
 
}
#endif