tree.c

/* tree --- plot recursive tree                             1996-12-16 */
/* Copyright (c) 1996 John Honniball, Froods Software Development      */

#include <stdio.h>
#include "turtle.h"

/* Geometric parameters */
#define LEFT_ANGLE   (30.0)
#define LEFT_SIZE    (0.8)
#define RIGHT_ANGLE  (25.0)
#define RIGHT_SIZE   (0.75)

void tree(const int level, const double len);

int main(int argc, const char *argv[])
{
   const int level = 8;
// const double size = 30.0;  /* 30mm trunk for A4 */
   const double size = 65.0;  /* 65mm trunk for A3 */
   
   turtle(DEV_HPGL, SIZ_A3, ORI_LAND, FLG_RELS|FLG_BORD);
   
// title("http://www.dorkbot.org/dorkbotbristol/", 3.75, BOT|CENTRE, FLG_NONE);
   title("Bristol Hackspace", 3.75, BOT|CENTRE, FLG_NONE);
   
   pen(UP);
   turn(-90.0);
   forward(1.9 * size);
   turn(180.0);
   pen(DOWN);

   colour(BLACK);
   
   tree(level, size);

   show();
   
   return (0);
}
   

/* tree --- recursive function to plot a tree */

void tree(const int level, const double len)
{
   forward(len);

   if (level == 0) {
      turn(180.0);
   }
   else {
      turn(LEFT_ANGLE);
      tree(level - 1, len * LEFT_SIZE);
      turn((180.0 - LEFT_ANGLE) - RIGHT_ANGLE);
      tree(level - 1, len * RIGHT_SIZE);
      turn(RIGHT_ANGLE);
   }

   forward(len);
}