gl-select.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
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////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_gl_select_h)
#define octave_gl_select_h 1
 
#include <map>
#include <string>
 
#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 (opengl_functions& glfcns)
      : opengl_renderer (glfcns), size (5)
    { }
 
    virtual ~opengl_selector (void) = default;
 
    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