#include <GL\GL.h>
#include <GL\GLU.h>
#include <GL\glut.h>
#include <stdio.h>

GLfloat ctrlpoints[4][4][3]={
 {{-1.5,-1.5,4.0},{-0.5,-1.5,2.0},{0.5,-1.5,-1.0},{1.5,-
1.5,2.0}},
 {{-1.5,-0.5,1.0},{-0.5,-0.5,3.0},{0.5,-0.5,0.0},{1.5,-0.5,-
1.0}},
 {{-1.5,0.5,4.0},{-0.5,0.5,0.0},{0.5,0.5,3.0},{1.5,0.5,4.0}},
 {{-1.5,1.5,-2.0},{-0.5,1.5,-2.0},{0.5,1.5,0.0},{1.5,1.5,-1.0}}
}; 

void display()
{
 int i,j;
 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 glColor3f(0.0,0.0,0.0);
 glLoadIdentity();
 glRotatef(85.0,1.0,1.0,1.0);
 for(j=0;j<=8;j++)
 {
 glBegin(GL_LINE_STRIP);
 for(i=0;i<=30;i++)

glEvalCoord2f((GLfloat)i/30.0,(GLfloat)j/8.0);
 glEnd();
 glBegin(GL_LINE_STRIP);
 for(i=0;i<=30;i++)

glEvalCoord2f((GLfloat)j/8.0,(GLfloat)i/30.0);
 glEnd();
 }
 glFlush();
}
void init()
{
 glClearColor(1.0,1.0,1.0,0.0);
 glLineWidth(2.0);

glMap2f(GL_MAP2_VERTEX_3,0,1,3,4,0,1,12,4,&ctrlpoints[0][0][0]);
 glEnable(GL_MAP2_VERTEX_3);
 glMapGrid2f(20,0.0,1.0,20,0.0,1.0);
 glEnable(GL_DEPTH_TEST);
 glShadeModel(GL_FLAT);
} 

void reshape(int w, int h)
{
	// Размер поля просмотра устанавливается равынм размеру окна 
   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
   // Обновление матрицы наблюдения
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();

   // Предотвращает деление на 0
   if (w <= h)
      glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w, 
               5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);
   else
      glOrtho(-5.0*(GLfloat)w/(GLfloat)h, 
               5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);

   // Обновление матрицы наблюдения
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
   glutInitWindowSize (500, 500);
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   init ();
   glutDisplayFunc(display);
   glutReshapeFunc(reshape);
   glutMainLoop();
   return 0;
}