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//  Two_D.cc - Convenience functions for 2D OpenGl rendering. 

//

//  Copyright (C) 2013 Sam Varner

//

//  This file is part of Vamos Automotive Simulator.

//

//  Vamos 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.

//  

//  Vamos 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 Vamos.  If not, see <http://www.gnu.org/licenses/>.



#include "Two_D.h"



#include <GL/glut.h>



using namespace Vamos_Media;



Two_D::Two_D (int width, int height)

{

  glMatrixMode (GL_PROJECTION);

  glPushMatrix ();

  glLoadIdentity ();



  gluOrtho2D (0, width, 0, height);

  glMatrixMode (GL_MODELVIEW);

  glPushMatrix ();

  glLoadIdentity ();

  

  glDisable (GL_DEPTH_TEST);

  glDisable (GL_LIGHTING);

  glDisable (GL_TEXTURE_2D);

}



Two_D::~Two_D ()

{

  glEnable (GL_DEPTH_TEST);

  glEnable (GL_LIGHTING);

  glEnable (GL_TEXTURE_2D);



  glMatrixMode (GL_PROJECTION);

  glPopMatrix ();

  glMatrixMode (GL_MODELVIEW);

  glPopMatrix ();

}



void Two_D::draw_string (const std::string& str, double x, double y)

{

  glColor3f (1.0, 1.0, 1.0);

  glRasterPos2d (x, y);

  for (std::string::const_iterator it = str.begin (); it != str.end (); ++it)

	{

      glutBitmapCharacter (GLUT_BITMAP_8_BY_13, *it);

	}

}



void Two_D::bar (const Vamos_Geometry::Rectangle& box, 

                 double red, double green, double blue,

                 double fraction)

{

  glColor3f (red, green, blue);



  // border

  glBegin (GL_LINE_LOOP);

  glVertex2f (box.left (), box.bottom ());

  glVertex2f (box.left (), box.top ());

  glVertex2f (box.right (), box.top ());

  glVertex2f (box.right (), box.bottom ());

  glEnd ();



  // fill

  glBegin (GL_QUADS);

  const double top = fraction * box.height () + box.bottom ();

  glVertex2f (box.left (), box.bottom ());

  glVertex2f (box.left (), top);

  glVertex2f (box.right (), top);

  glVertex2f (box.right (), box.bottom ());

  glEnd ();

}



void Two_D::lights (double x, double y, double r, int n, int n_on,

                    double red_on, double green_on, double blue_on,

                    double red_off, double green_off, double blue_off)

{

  glTranslatef (x + 6*r, y, 0.0);



  GLUquadricObj* disk = gluNewQuadric();

  gluQuadricDrawStyle (disk, GLU_FILL);



  glColor3f (red_off, green_off, blue_off);

  for (int light = 1; light <= n; light++)

    {

      if (light >= n_on)

        glColor3f (red_on, green_on, blue_on);

      glTranslatef (-2.5*r, 0.0, 0.0);

      gluDisk (disk, 0.0, r, 32, 32);

    }



  gluDeleteQuadric (disk);

}