gl-select.h

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/*

Copyright (C) 2011-2017 Michael Goffioul

This file is part of Octave.

Octave 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 3 of the License, or (at your
option) any later version.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if ! defined (octave_gl_select_h)
#define octave_gl_select_h 1

#include <map>

#include "gl-render.h"
#include "oct-opengl.h"

namespace octave
{

  enum select_flags
  {
    select_ignore_hittest = 0x01,
    select_last           = 0x02
  };

  class opengl_selector : public opengl_renderer
  {
  public:
    opengl_selector (void) : size (5) { }

    virtual ~opengl_selector (void) { }

    graphics_object select (const graphics_object& ax, int x, int y,
                            int flags = 0);

    virtual void draw (const graphics_object& go, bool toplevel = true);

  protected:
    virtual void draw_text (const text::properties& props);

    virtual void draw_image (const image::properties& props);

    virtual void setup_opengl_transformation (const axes::properties& props);

    virtual void init_marker (const std::string& m, double size, float width);

    virtual Matrix render_text (const std::string& txt,
                                double x, double y, double z,
                                int halign, int valign, double rotation = 0.0);

  private:
    void apply_pick_matrix (void);

    void fake_text (double x, double y, double z, const Matrix& bbox,
                    bool use_scale = true);

  private:
    // The mouse coordinate of the selection/picking point
    int xp, yp;

    // The size (in pixels) of the picking window
    int size;

    // The OpenGL name mapping
    std::map<GLuint, graphics_object> object_map;
  };

}

#endif