CG/HilbertCurve.cpp

#include<iostream>
#include<graphics.h>
#include<math.h>
#include<cstdlib>
#include<stdlib.h>
using namespace std;

void move(int j, int h, int &x, int &y)
{
	if(j == 1)
	{
		y = y - h;
	}
	else if(j == 2)
	{
		x = x + h;
	}
	else if(j == 3)
	{
		y = y + h;
	}
	else if(j == 4)
	{
		x = x - h;
	}
	setcolor(BROWN);
	lineto(x,y);
}

void hilbert(int d, int r, int u, int l, int i, int h, int &x, int &y)
{
	if(i > 0)
	{
		i--;
		hilbert(r,d,l,u,i,h,x,y);
		move(d,h,x,y);
		hilbert(d,r,u,l,i,h,x,y);
		move(r,h,x,y);
		hilbert(d,r,u,l,i,h,x,y);
		move(u,h,x,y);
		hilbert(l,u,r,d,i,h,x,y);
	}
}

int main()
{
	int gd = DETECT,gm;
	initgraph(&gd,&gm,NULL);
	int x,y,h,n,u = 1,r = 2,d = 3,l = 4;
	cout<<"Enter x-co-ordinate of initial point: ";
	cin>>x;
	
	cout<<"Enter y-co-ordinate of initial point: ";
	cin>>y;
	
	cout<<"Enter length of line segment: ";
	cin>>h;
	
	cout<<"Enter order of curve: ";
	cin>>n;
	
	moveto(x,y);
	hilbert(d,r,u,l,n,h,x,y);
	getch();
	closegraph();
	return 0;
}