#include "GL/glut.h"
#include <iostream.h>


int width=500,height=500;

void init();
void display();
void reshape(int w, int h);


main(int argc, char* argv[])
{
	
	/*  set up window */
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE );
	glutInitWindowSize(width,height);
	glutInitWindowPosition(100,100);
	glutCreateWindow("My OpenGL Program");

	/* initialize state */
	init();

	/* register call back functions */
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);

	/* wait until something happens */
	glutMainLoop();


	return 1;
}

void init()
{
	/*  clear color is black  */
	glClearColor(0.0,0.0,0.0,0.0);

	/*  define the viewing system */ 
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-10.0, 10.0, -10.0, 10.0, 10.0, 50.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	
}

void display()
{

	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0,0.0,0.0);
	glLoadIdentity();  // GL_MODELVIEW is current matrix
	gluLookAt(0.0,0.0,10.0,0.0,0.0,-1.0, 0.0, 1.0, 0.0);  //viewing xfm
	glTranslatef(0.0,0.0,-20.0); // modeling xfm
	glutWireCube(5.0);  // object
	
	glutSwapBuffers();

}

void reshape(int w, int h)
{
	/* width and height store current window dimensions */
	width = w;
	height = h;
	
	/*  map the projection plane to the entire window */
	glViewport(0,0,w,h);


}