/**
		     * 計算球碰到圓形方塊後的向量
		 * 方程式如下
		 * 方程1: (x0 * (xa - xb) + y0 * (ya - yb)) / x1 * (x1 * (xa - xb) + y1 * (ya - yb)) = -1
		 * 方程2: cosA = (x0 * (xa - xb) + y0 * (ya - yb)) / (Math.sqrt(x0 * x0 + y0 * y0) * Math.sqrt((xa - xb) * (xa - xb) + (ya - yb) * (ya - yb)))
		 * 方程3: x0 * x1 + y0 * y1 = (x0 * x0 + y0 * y0) * (1 - 2 * cosA * cosA)
		 * 結果為 x1, y1
		 * @param block 圓形方塊
		 * @param ball 球
		 */
		public getColliderVector2(block: Block, ball: BallObj): Laya.Point {
			let Axy = block.getColliderPoint();
			let Bxy = ball.getColliderPoint();

			//方塊的座標
			let xa = Axy.x;
			let ya = Axy.y;
			//球的座標
			let xb = Bxy.x;
			let yb = Bxy.y;

			//v0_為球的速度，向量
			let v0_ = ball.getMoveLength();
			//分解x y 軸速度
			let x0 = v0_.x;
			let y0 = v0_.y;

			let x0_2 = x0 * x0;
			let y0_2 = y0 * y0;
			
			let xa_xb = xa - xb;
			let ya_yb = ya - yb;

			let xx = x0 * xa_xb + y0 * ya_yb;
			
			if (xx == 0) {
				//速度與 AB兩物體連線垂直，理論上無法碰撞，直接返回初速度
				return v0_;
			}

			let xxyy = x0 * x0 + y0 * y0;

			let cos = xx / (Math.sqrt(xxyy) * Math.sqrt(xa_xb * xa_xb + ya_yb * ya_yb));

			let cos1 = 1 - 2 * cos * cos;

			let x0x1_p_y0y1 = xxyy * cos1;

			let y1 = -1 * (xx * x0 + x0x1_p_y0y1 * xa_xb) / (ya_yb * x0 - y0 * xa_xb);
			let x1 = -1 * (xx + y1 * ya_yb) / xa_xb;

			return new Laya.Point(x1, y1);
		}
	}