分形树

#define g 0.618
#define PI 3.1416
#include "graphics.h"
#include "stdio.h"
#include "conio.h"
#include "math.h"
float thita=60.0;
void grow(int x,int y,float lenth,float fai)
{
  int x1,y1;
  int nx,ny,count;
  float nlenth,t1,t2;
  t1 :=cos(fai*PI/180);
  t2 :=sin(fai*PI/180);
  x1=x+(int)(lenth*t1);
  y1=y-(int)(lenth*t2);
  line(x,y,x1,y1);
  if (lenth<10) return;
  nlenth=lenth;
  nx=x;  ny=y;
  for (count=0;count<7;count++)
  {
    nx=nx+nlenth*(1-g)*cos(fai*PI/180.0);
    ny=ny-nlenth*(1-g)*sin(fai*PI/180.0);
    grow(nx,ny,nlenth*(1-g),fai+thita);
    grow(nx,ny,nlenth*(1-g),fai-thita);
    nlenth*=g;
  }
}

void main()
{
  int gm,gd;
  detectgraph(&gd,&gm);
  initgraph(&gd,&gm," ");
  grow(300,300,280.0,90.0);
  getch();
  closegraph();
}