/***************************************************************************
 *   Copyright (C) 2008 by Eduard Grinke & Simon Martin Reich              *
 *   University of Goettingen, Germany                                     *
 *                                                                         *
 *   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 3 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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 *                                                                         *
 *                                                                         *
 *                                                                         *
 *   OpenGL needs to be installed, more information  can be found at:      *
 *   http://www.opengl.org/                                                *
 *                                                                         *
 *   Please remember to set the correct linker flag, in most cases         *
 *   something like:                                                       *
 *   Project | Project Options | Configure Options | flags : -lglut        *
 *                                                                         *
 *                                                                         *
 *                                                                         *
 *             https://sourceforge.net/projects/especially                 *
 *                                                                         *
 ***************************************************************************/


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>
#include <cstdlib>

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <math.h>

#include <especially.h>

using namespace std;





int main(int argc, char *argv[])
{
	ESv_fps_color_red 	=  0.0f;
	ESv_fps_color_green 	=  0.0f;
	ESv_fps_color_blue 	=  0.0f;
	ESv_fps_pos_x 		=-28.0f;
	ESv_fps_pos_y 		= 20.0f;


	// uncomment or just use F2
	// ESv_leavebuffer = true;


	ES_start( "ESpecially-Engine - Tutorial 3", false, true, 1.0f, 1.0f, 1.0f, argc, argv );

	return EXIT_SUCCESS;
}





// Now this is our callback from Especially. All our drawing and calculations go here. It is called every frame.
int ES_render()
{
	// same stuff as in tutorial 1 & 2
	ES_coorsys2d( 0.0f, 0.0f, -10.0f, 10.0f, -10.0f, 10.0f, true, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f ); 
	ES_drawmass( sin(ESv_programtime/100)*3, cos(ESv_programtime/1000)*4, 2, 0.2, false, true, 0.0f, 0.5f, 1.0f );



	// now we would like two nice graphs besides the main one showing only x- or y-position, the mass is now a triangle and a square. Hwo know why...
	ES_coorsys1d_y( 20.0f, 0.0f, -10.0f, 10.0f, false, 0.0f, 1.0f, 0.0f ); 
	ES_drawmass( 20.0f, cos(ESv_programtime/1000)*4, 3, 1, true, false, 0.0f, 0.5f, 1.0f );

	ES_coorsys1d_x( 0.0f, 20.0f, -10.0f, 10.0f, false, 0.0f, 1.0f, 0.0f ); 
	ES_drawmass( sin(ESv_programtime/100)*3, 20.0f, 4, 1, true, false, 0.0f, 0.5f, 1.0f );



	// last but not least we want the speed of the object drawn into a nice graph below the 2D coordinate system
	ES_drawbox( -50.0f, -12.0f, 100.0f, 0.2f, 1.0f, true, false, 0.0f, 0.0f, 0.0f );

	float speed = sqrt((3*cos(ESv_programtime/100))*(3*cos(ESv_programtime/100)) + (-4*sin(ESv_programtime/1000)*(-4*sin(ESv_programtime/1000))));
	ES_coorsys2d( -25.0f, -20.0f, -1.0f, 40.0f, -1.0f, 7.0f, true, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f ); 
	ES_drawellipse( -25.0f + ESv_programtime/1000, -20.0f + speed, 0.05f, 0.05f, 0.5f, true, false, 0.0f, 0.5f, 1.0f );



	// the data plot looks pretty awesomw, so why don't put the text next to the graph?
	ES_drawbox( 18.0f, -20.0f, 6.0f, 3.3f, 1.0f, false, false, 0.0f, 0.5f, 1.0f );
	ES_write( "current speed:", 19.0f, -18.0f, 0.0f, 0.5f, 1.0f );
	ES_writenr( speed, 19.0f, -19.0f, 0.0f, 0.5f, 1.0f );

	cout << "current speed: " << speed << endl;



	return true;
}