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

// function prototypes
void display(void);
void reshape(int width, int height);
void keyboard(unsigned char key, int x, int y);
void init(void);
void mouse(int button, int state, int x, int y);
void motion(int x, int y);

int	windowWidth = 400;
int windowHeight = 400;


int 
main(int argc, char **argv)
{

  // set up window
  glutInitWindowSize(windowWidth, windowHeight);
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  glutCreateWindow("Test Harness");

  // register callback functions
  glutDisplayFunc(display);
  glutReshapeFunc(reshape); 
  glutKeyboardFunc(keyboard);
  glutMouseFunc(mouse);
  glutMotionFunc(motion);
  
  // initalize opengl parameters
  init();

  // loop until something happens
  glutMainLoop();
  return 0;           
}

void init()
{
  // initialize viewing system
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(45.0, 1.0, 1.0, 100.0);
  glMatrixMode(GL_MODELVIEW);
 

  // initialize background color to black
  glClearColor(0.0,0.0,0.0,0.0);

  // enable depth buffering
  glEnable(GL_DEPTH_TEST);
}



void reshape(int width, int height)
{
	glViewport(0,0,width,height);
}

void display()
{
	// initialize modelview matrix
	glLoadIdentity();
	gluLookAt(0,1,5,0,1,0,0,1,0);

	// clear buffers
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


	// draw a blue triangle with vertices (0,0,0), (1,0,0), (0.5f,0,0.5f)
	glColor3f(0,0,1);	// establish color
	glBegin(GL_TRIANGLES);
	glVertex3f(0,0,0);
	glVertex3f(1,0,0);
	glVertex3f(0.5f,0,0.5f);
	glEnd();


	// draw a red sphere centered at (0.5,0.5,-0.5) with radius .05
	glColor3f(1,0,0);  // establish color in RGB
	glPushMatrix();
	glTranslatef(0.5f,0.5f,-0.5f); // move center
	glutSolidSphere(0.05f,20,20);   // draw a unit sphere at the origin
	glPopMatrix(); //end sphere draw
	
	// draw to screen
	glutSwapBuffers();
}

void keyboard(unsigned char key, int x, int y)
{

	if (key==' ')
		cout << "You hit the space bar." << endl;

	glutPostRedisplay();  // redraw screen when all other requests 
						  // are satisfied
}

void mouse(int button, int state, int x, int y)
{
	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
		cout << "You pressed the left mouse button down." << endl;

	glutPostRedisplay();  // redraw screen when all other requests
						  // are satisfied
}

void motion(int x, int y)
{
	cout << "You moved the mouse to " << x << " " << y << endl;

	glutPostRedisplay();  // redraw screen when all other requests 
						  // are satisfied
}