OpenGL

#include <GL/glut.h>

void pytree(int n)

{

if(n>0)

{

glPushMatrix();

glTranslatef(-0.5,1.0,0);

glRotatef(45, 0.0, 0.0, 1.0);

glScalef(0.707,0.707,0.707);

pytree(n-1);

glPopMatrix();

glPushMatrix();

glTranslatef(0.5,1.0,0);

glRotatef(-45, 0.0, 0.0, 1.0);

glScalef(0.707,0.707,0.707);

pytree(n-1);

glPopMatrix();

glutWireCube(1);

}

}

void pytreeInit(int n)

{

glColor3f(1.0, 0.0, 0.0);

pytree(n);

}

void display (void)

{

glClearColor (0.0,0.0,0.0,1.0);

glClear (GL_COLOR_BUFFER_BIT);

glLoadIdentity();

gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

pytreeInit(9);

glFlush();

}

void reshape (int w, int h)

{

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

glMatrixMode (GL_PROJECTION);

glLoadIdentity ();

gluPerspective (60, (GLfloat)w / (GLfloat)h, 1.0, 100.0);

glMatrixMode (GL_MODELVIEW);

}

int main (int argc, char **argv)

{

glutInit (&argc, argv);

glutInitDisplayMode (GLUT_SINGLE);

glutInitWindowSize (500, 500);

glutInitWindowPosition (100, 100);

glutCreateWindow ("Pythagoras Tree");

glutDisplayFunc (display);

glutReshapeFunc (reshape);

glutMainLoop ();

return 0;

}