C语言WFC实现中心点画圆法，Bresenham画圆法

代码实现：

中心点画圆法

//画圆函数实现
void CCGDrawingView::MidpointCircle(int x1, int y1, int R, CDC* pDC)
{
	int x, y;
	double d;
	x = 0; y = R; d = 1 - R;
	pDC->SetPixel(x1 + x, y1 + y, RGB(255, 0, 0));
	//绘制对称点
	pDC->SetPixel(x1 + x, y1 - y, RGB(255, 0, 0));
	while (x < y) {
		if (d < 0) {
			d += 2 * x + 3;
			x++;
		}
		else {
			d += 2 * (x - y) + 5;
			x++;
			y--;
		}
		//绘制对称点
		pDC->SetPixel(x1 + x, y1 + y, RGB(255, 0, 0));
		pDC->SetPixel(x1 + y, y1 + x, RGB(255, 0, 0));
		pDC->SetPixel(x1 + y, y1 - x, RGB(255, 0, 0));
		pDC->SetPixel(x1 + x, y1 - y, RGB(255, 0, 0));
		pDC->SetPixel(x1 - x, y1 - y, RGB(255, 0, 0));
		pDC->SetPixel(x1 - y, y1 - x, RGB(255, 0, 0));
		pDC->SetPixel(x1 - y, y1 + x, RGB(255, 0, 0));
		pDC->SetPixel(x1 - x, y1 + y, RGB(255, 0, 0));
	}
}

Bresenham画圆法

void CCGDrawingView::BresenhamCircle(int x1, int y1, int R, CDC* pDC) {