include gl glut GLUnurbsObj nobj GLfloat ctlarray -0 -0 -0 -0 void ini

#include <gl/glut.h>
GLUnurbsObj* nobj;
GLfloat ctlarray[][3]={{-0.9, -0.8, 0.0},
{-0.2, 0.8, 0.0},
{0.2, -0.5, 0.0},
{0.9, 0.8, 0.0}};

void init(void)
{
	glClearColor(1, 1, 1, 1);
	nobj = gluNewNurbsRenderer();
	gluNurbsProperty (nobj, GLU_SAMPLING_TOLERANCE, 25.0);
}
void Display()
{
	GLfloat knot[] = {0.0, 0.0, 0.0, 1.0, 2.0, 2.0, 2.0};
	glClear (GL_COLOR_BUFFER_BIT);
	glLineWidth(3.0);
	glColor3f(0, 0.3, 1);
	gluNurbsCurve(nobj, 7, knot, 3, &ctlarray[0][0], 3, GL_MAP1_VERTEX_3);
	glPointSize(4.0);
	glColor3f(0.0, 0.0, 1);
	glBegin(GL_POINTS);
	for(int i=0; i<4; i++)
	{
		glVertex3f(ctlarray[i][0], ctlarray[i][1], ctlarray[i][2]);
	}
	glEnd();
	glFlush();
}
void main()
{
	glutInitDisplayMode (GLUT_RGBA | GLUT_SINGLE);
	glutInitWindowSize (480, 480);
	glutInitWindowPosition (100, 100);
	glutCreateWindow(" ");
	init();
	glutDisplayFunc (Display);
	glutMainLoop();
}