#include <GL/glut.h>

/*=========================================================================*/

typedef struct
{
  float x;
  float y;
  float z;
  float r;
  float g;
  float b;
} point;

point p[8]={
    {-0.5,-0.5, 0.5,0.0,0.0,0.0},
    {-0.5, 0.5, 0.5,0.0,0.0,0.0},
    { 0.5, 0.5, 0.5,0.0,0.0,0.0},
    { 0.5,-0.5, 0.5,0.0,0.0,0.0},
    {-0.5,-0.5,-0.5,0.0,0.0,0.0},
    {-0.5, 0.5,-0.5,0.0,0.0,0.0},
    { 0.5, 0.5,-0.5,0.0,0.0,0.0},
    { 0.5,-0.5,-0.5,0.0,0.0,0.0}};
  
int f[6][4]={
  {0,1,2,3},
  {3,2,6,7},
  {4,5,6,7},
  {0,1,5,4},
  {1,5,6,2},
  {0,4,7,3}};

char presse;
int anglex,angley,x,y,xold,yold;
int width=500, height=500, deep=400;

/*=========================================================================*/

void display();
void mouse(int bouton,int etat,int x,int y);
void mousemotion(int x,int y);


/*=========================================================================*/

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

  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
  glutInitWindowPosition(200,200);
  glutInitWindowSize(width,height);
  glutCreateWindow("cube");
  glOrtho(-(width/2), (width/2), -(height/2), (height/2), -deep, deep);

  glClearColor(0.0,0.0,0.0,0.0);
  glColor3f(1.0,1.0,1.0);
  glPointSize(2.0);
  
   GLfloat positionL0[] = { 100, -100, 100, 0.0 };
   GLfloat positionL1[] = { -100, 0, -100, 0.0 };
   GLfloat positionL2[] = { 100, 0, -100, 0.0 };
   GLfloat positionL3[] = { -100, 100, 100, 0.0 };
   GLfloat positionL4[] = { -100, 100, -100, 0.0 };
   GLfloat positionL5[] = { 100, 100, -100, 0.0 };   
   glEnable(GL_LIGHTING);
   glEnable(GL_LIGHT0);
   glEnable(GL_DEPTH_TEST);  
   glLightfv(GL_LIGHT0, GL_POSITION, positionL0);
   glLightfv(GL_LIGHT0, GL_POSITION, positionL1);
   glLightfv(GL_LIGHT0, GL_POSITION, positionL2); 
   glLightfv(GL_LIGHT0, GL_POSITION, positionL3);
   glLightfv(GL_LIGHT0, GL_POSITION, positionL4); 
   glLightfv(GL_LIGHT0, GL_POSITION, positionL5); 
  
  glutDisplayFunc(display);
  glutMouseFunc(mouse);
  glutMotionFunc(mousemotion);


  glutMainLoop();
  return 0;
}

/*=========================================================================*/

void display()
{
  int i,j;

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  glLoadIdentity();
  
  
  /*--rotation of the mouse-*/
  /*------------------------*/
  
  glRotatef(-angley,1.0,0.0,0.0);
  glRotatef(-anglex,0.0,1.0,0.0);


  /*--drawing the cube--*/
  /*--------------------*/
  
  glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
    
    GLfloat colorvec[] = { 1.0, 1.0, 1.0, 1.0 };
    glMaterialfv(GL_FRONT, GL_DIFFUSE, colorvec);
 
  for (i=0;i<6;i++)
    {
      glBegin(GL_POLYGON);
      for (j=0;j<4;j++)
	{
	  glColor3f(p[f[i][j]].r,p[f[i][j]].g,p[f[i][j]].b);
	  glVertex3f(p[f[i][j]].x,p[f[i][j]].y,p[f[i][j]].z);
	}
      glEnd();
    }
    
  
  /*--finish with opengl stuff--*/
  /*----------------------------*/
    
  glFlush(); 
  glutSwapBuffers();
}


/*=========================================================================*/

void mouse(int button, int state,int x,int y)
{

  if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) 
  {
    presse = 1; 
    xold = x;
    yold=y;
  }

  if (button == GLUT_LEFT_BUTTON && state == GLUT_UP) 
    presse=0; 
}

/*=========================================================================*/

void mousemotion(int x,int y)
  {
    if (presse) 
    {
     
      anglex=anglex+(x-xold); 
      angley=angley+(y-yold);
      glutPostRedisplay(); 
    }
    
    xold=x; 
    yold=y;
  }