中点画圆法（计算机图形学）C++实现

#include
#include
#include
using namespace std;

void MidPoint_Circle(const int& x0, const int& y0, const int& r)
{
	initgraph(800, 640);
	int d = 1 - r, x = 0, y = r;
	while (x <= y)
	{
		cout << "x=" << x << "，y=" << y << "，d=" << d << endl;
		putpixel(x + x0, y + y0,RED);
		putpixel(x + x0, -y + y0,RED);
		putpixel(-x + x0, y + y0, RED);
		putpixel(-x + x0, -y + y0, RED);
		putpixel(y + x0, x + y0, RED);
		putpixel(y + x0, -x + y0, RED);
		putpixel(-y + x0, x + y0, RED);
		putpixel(-y + x0, -x + y0, RED);
		if (d < 0)
		{
			d += (2 * x + 3);
			x++;
		}
		else
		{
			d += (2 * x - 2 * y + 5);
			x++;
			y--;
		}
	}
	_getch();
	closegraph();
}

int main(void)
{
	MidPoint_Circle(200,200,10);
	return 0;
}