#include "stdafx.h"
#include <gl/freeglut.h>
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>



const int n = 6;
GLfloat point[n][3] =
{
	{ 1.40152f, 2.75472f, 0.0f }, { 4.84848f, 8.41509f, 0.0f }, { 4.84848f, 9.4f, 0.0 },
	{ 6.21212f, 7.0566f, 0.0f }, { 5.0f, 4.22642f, 0.0f }, { 9.01515f, 1.32075f, 0.0f }
};


const GLint k = 3;
const GLint m = n + k;

GLfloat knot[m] = { 0.000, 0.000, 0.000, 0.300, 0.500, 0.700, 1.000, 1.000, 1.000 };


void render(void)
{
	glClearColor(0.2f, 0.2f, 0.4f, 1.0f);
	glEnable(GL_DEPTH_TEST);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glColor3f(1.0f, 0.0f, 0.0f);
	glPointSize(10.0f);
	glBegin(GL_POINTS);
	for (GLint i = 0; i<n; i++){ glVertex3fv(point[i]); }
	glEnd();
	glColor3f(1.0f, 1.0f, 0.0f);
	glLineWidth(1.0f);
	glBegin(GL_LINE_STRIP);
	for (GLint i = 0; i<n; i++){ glVertex3fv(point[i]); }
	glEnd();

	// krzywa uniform
	glColor3f(0.0f, 1.0f, 0.0f);
	glLineWidth(3.0f);
	GLUnurbs *q = gluNewNurbsRenderer();
	gluNurbsProperty(q, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);
	gluNurbsProperty(q, GLU_SAMPLING_METHOD, GLU_PATH_LENGTH);
	gluNurbsProperty(q, GLU_SAMPLING_TOLERANCE, 10.0f);
	gluBeginCurve(q);
	gluNurbsCurve(q, m, knot, 3, &point[0][0], k, GL_MAP1_VERTEX_3);
	gluEndCurve(q);
	gluDeleteNurbsRenderer(q);

	glFlush();
}

void reshape(int w, int h)
{
	GLdouble
		xo = -10.0f, x1 = 10.0f, yo = -10.0f, y1 = 10.0f, zo = -1.0f, z1 = 1.0f;
	GLdouble q = (GLdouble)w / h; glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if (w <= h)
	{
		glOrtho(xo, x1, yo / q, y1 / q, zo, z1);
	}
	else
	{
		glOrtho(xo*q, x1*q, yo, y1, zo, z1);
	}
	glMatrixMode(GL_MODELVIEW);
}

int main(int argc, char **argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA | GLUT_DEPTH);
	glutInitWindowPosition(0, 0);
	glutInitWindowSize(800, 600);
	glutCreateWindow("Okno renderowania OpenGL");
	//glutKeyboardFunc(asckey);
	//glutSpecialFunc(keyboard);
	glutReshapeFunc(reshape);
	glutDisplayFunc(render);
	glutIdleFunc(render);
	glutMainLoop();

	system("PAUSE");
	return 0;
}