bezier

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdio.h>
#include <stdlib.h>

int screenWidth = 600;
int screenHeight = 600;
int fps = 60;

GLdouble cameraPos[] = {0.0, 0.0, 25.0};
double baserotation = 180.0;
double rotation = 0.0;

GLfloat lightAmb[] = {0.1, 0.1, 0.1, 1.0};
GLfloat lightDif[] = {0.7, 0.7, 0.7, 1.0};
GLfloat lightPos[] = {0, 0, 800, 1.0};
GLfloat lightSpec[] = {1, 1, 1, 1};

GLfloat points[4][3] = {
    {-5.0, 5.0, 0.0},
    {0.0, 0.0, 0.0},
    {5.0, -2.0, 0.0},
    {7.0, 4.0, 0.0}
    };

GLuint activePoint = 0;

void init(){
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_POINT_SMOOTH);
    glEnable(GL_MAP1_VERTEX_3);
}

void display() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glLoadIdentity ();

    gluLookAt(cameraPos[0], cameraPos[1], cameraPos[2], 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);


    glColor3f(1.0, 0.0, 0.0);
    glPointSize(5);
    glBegin(GL_POINTS);
        (activePoint != 0) ? glColor3f(1.0, 0.0, 0.0) : glColor3f(0.0, 1.0, 0.0);
        glVertex3fv(points[0]);
        (activePoint != 1) ? glColor3f(1.0, 0.0, 0.0) : glColor3f(0.0, 1.0, 0.0);
        glVertex3fv(points[1]);
        (activePoint != 2) ? glColor3f(1.0, 0.0, 0.0) : glColor3f(0.0, 1.0, 0.0);
        glVertex3fv(points[2]);
        (activePoint != 3) ? glColor3f(1.0, 0.0, 0.0) : glColor3f(0.0, 1.0, 0.0);
        glVertex3fv(points[3]);
    glEnd();

    glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &points[0][0]);
    glMapGrid1f(30, 0, 1);
    glEvalMesh1(GL_LINE, 0, 30);

    glFlush ();
    glutPostRedisplay();
    glutSwapBuffers();
}

void reshape(int w, int h) {
    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    gluPerspective(45.0, (GLfloat)w / (GLfloat)h, 1.5, 300.0);

    glMatrixMode(GL_MODELVIEW);
}

void keyboard(unsigned char key, int x, int y){
    switch(key){
        case 27 :
        case 'q':
            exit(0);
            break;
        case 32:
            ++activePoint %= 4; break;
        case 'w':
            points[activePoint][1]++; break;
        case 's':
            points[activePoint][1]--; break;
        case 'a':
            points[activePoint][0]--; break;
        case 'd':
            points[activePoint][0]++; break;
    }
}

void timerfunc(int p){
    rotation += 0.3;

    glutPostRedisplay();
    glutTimerFunc(1000/fps, &timerfunc, 0);
}

void menu(int value) {
    switch(value) {
        case 0:
            exit(0);
            break;
    }
}

int main(int argc, char *argv[]) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(screenWidth, screenHeight);
    glutCreateWindow(argv[0]);
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);
    glutTimerFunc(1000/fps, &timerfunc, 0);

    glutCreateMenu(menu);
    glutAddMenuEntry("Wyjscie", 0);

    glutAttachMenu(GLUT_RIGHT_BUTTON);

    init();

    glutMainLoop();

    return 0;
}