Криві Безьє

#include <iostream>

#include <windows.h>

#include <iostream>

#include <GL/gl.h>

#include <GL/glu.h>

//#include <GL/glaux.h>

#include <GL/glut.h>

GLfloat ctrlpoints[4][3] = {

{ -4.0, -4.0, 0.0 },{ -2.0, 4.0, 0.0 },

{ 2.0, -4.0, 0.0 },{ 4.0, 4.0, 0.0 } };

void init(void)

{

glClearColor(0.0, 0.0, 0.0, 0.0);

glShadeModel(GL_FLAT);

glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &ctrlpoints[0][0]);

glEnable(GL_MAP1_VERTEX_3);

}

void display(void)

{

int i;

glClear(GL_COLOR_BUFFER_BIT);

glColor3f(1.0, 1.0, 1.0);

glBegin(GL_LINE_STRIP);

for (i = 0; i <= 30; i++)

glEvalCoord1f((GLfloat)i / 30.0);

glEnd();

/* The following code displays the control points as dots. */

glPointSize(5.0);

glColor3f(1.0, 1.0, 0.0);

glBegin(GL_POINTS);

for (i = 0; i < 4; i++)

glVertex3fv(&ctrlpoints[i][0]);

glEnd();

glFlush();

}

void reshape(int w, int h)

{

glViewport(0, 0, (GLsizei)w, (GLsizei)h);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

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);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();

}

void keyboard(unsigned char key, int x, int y)

{

switch (key) {

case 27:

exit(0);

break;

}

}

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);

glutKeyboardFunc(keyboard);

glutMainLoop();

return 0;

}