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C code for simple Pythagoras tree . Program is tested in Visual C++ 6.0.
#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;
}
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