如图\(1\),在平面直角坐标系\(xOy\)中,已知点\(A\)和点\(B\)的坐标分别为\(A(-2,0)\),\(B(0,-6)\),将\(Rt\triangle AOB\)绕点\(O\)按顺时针方向分别旋转\(90^{\circ}\),\(180^{\circ}\)得到\(Rt\triangle A_{1}OC\),\(Rt\triangle EOF.\)抛物线\(C_{1}\)经过点\(C\),\(A\),\(B\);抛物线\(C_{2}\)经过点\(C\),\(E\),\(F\).
\((1)\)点\(C\)的坐标为 ______ ,点\(E\)的坐标为 ______ ;抛物线\(C_{1}\)的解析式为 ______ \(.\)抛物线\(C_{2}\)的解析式为 ______ ;
\((2)\)如果点\(P(x,y)\)是直线\(BC\)上方抛物线\(C_{1}\)上的一个动点.
\(①\)若\(∠PCA=∠ABO\)时,求\(P\)点的坐标;
\(②\)如图\(2\),过点\(P\)作\(x\)轴的垂线交直线\(BC\)于点\(M\),交抛物线\(C_{2}\)于点\(N\),记\(h=PM+NM+ \sqrt {2}BM\),求\(h\)与\(x\)的函数关系式,当\(-5\leqslant x\leqslant -2\)时,求\(h\)的取值范围.