8dir

8dir.cpp

#include <iostream>
using namespace std;

inline int deltaTable(int idx) { return (idx-4)%4 * (abs(i-4)-4) / 3; }

int main() 
{
	for(int i =0; i < 8; i++)
	{
		int x = deltaTable(i);
		int y = deltaTable((i+6)%8);
		
		cout << "(" << x << "," << y  << ")" << endl;
	}
	
	/* output
	(0,-1)
	(1,-1)
	(1,0)
	(1,1)
	(0,1)
	(-1,1)
	(-1,0)
	(-1,-1)
	*/
	
	//straight -> cross
	
	for(int i =0; i < 8; i++)
	{
		int idx = (i*2-1) % 7 + 1;
		int x = deltaTable(idx);
		int y = deltaTable((idx+6)%8);
		
		cout << "(" << x << "," << y  << ")" << endl;
	}
	
	/* output
	(0,-1)
	(1,0)
	(0,1)
	(-1,0)
	(1,-1)
	(1,1)
	(-1,1)
	(-1,-1)
	*/
	
	return 0;
}