DaGiac

//https://www.facebook.com/pages/C%C3%B9ng-h%E1%BB%8Dc-l%E1%BA%ADp-tr%C3%ACnh/632038696941833
#include "graphics.h"
#include <iostream>
#include <vector>
using namespace std;

class Diem
{
public:
	int x, y;
};
class DaGiac
{
public:
	DaGiac(vector <Diem> vDiem = {})
	{
		this->vDiem = vDiem;
	}
	void VeDaGiac()
	{
		for (int i = 0; i < vDiem.size() - 1; i++)
		{
			line(vDiem[i].x, vDiem[i].y, vDiem[i + 1].x, vDiem[i + 1].y);
		}
		line(vDiem[0].x, vDiem[0].y, vDiem[vDiem.size() - 1].x, vDiem[vDiem.size() - 1].y);
	}
	void Nhap(int n = 0)
	{
		Diem D;
		for (int i = 0; i < n; i++)
		{
			cout << "Nhap x: ";
			cin >> D.x;
			cout << "Nhap y: ";
			cin >> D.y;
			if (vDiem.size() > 1)
			{
				setcolor(BLACK);
				VeDaGiac();
			}
			vDiem.push_back(D);
			if (vDiem.size() > 1)
			{
				setcolor(YELLOW);
				VeDaGiac();
			}
		}
	}
	void TinhTien()
	{
		int c;
		do
		{
			if (kbhit())
			{
				c = getch();
				setcolor(BLACK);
				VeDaGiac();
				if (c == 72) for (int i = 0; i < vDiem.size(); i++) vDiem[i].y--;
				if (c == 80) for (int i = 0; i < vDiem.size(); i++) vDiem[i].y++;
				if (c == 75) for (int i = 0; i < vDiem.size(); i++) vDiem[i].x--;
				if (c == 77) for (int i = 0; i < vDiem.size(); i++) vDiem[i].x++;
				setcolor(YELLOW);
				VeDaGiac();
			}

		} while (1);
	}
protected:
	vector <Diem> vDiem;
};
class TamGiac : public DaGiac
{
public:
	TamGiac() : DaGiac(){};
	void Nhap()
	{
		DaGiac::Nhap(3);
	}
};
class TuGiac : public DaGiac
{
public:
	TuGiac() : DaGiac(){};
	void Nhap()
	{
		DaGiac::Nhap(4);
	}
};

int main( )
{
	system("start https://www.facebook.com/pages/C%C3%B9ng-h%E1%BB%8Dc-l%E1%BA%ADp-tr%C3%ACnh/632038696941833");
	initwindow(600, 600);
	TamGiac d;
	d.Nhap();
	d.TinhTien();
    return 0;
}