p->axisRect()->insetLayout()->setInsetAlignment(0,Qt::AlignRight|Qt::AlignBottom); //图例置于右下
/*
Qt::AlignLeft|Qt::AlignTop); //图例置于左上
Qt::AlignCenter|Qt::AlignTop);//图例置于中上
Qt::AlignRight|Qt::AlignTop);//图例置于右上
Qt::AlignLeft|Qt::AlignCenter);//图例置于左中
Qt::AlignCenter);             //图例置于正中 
Qt::AlignRight|Qt::AlignCenter);//图例置于右中
Qt::AlignLeft|Qt::AlignBottom);//图例置于左下
Qt::AlignCenter|Qt::AlignBottom);//图例置于中下 */
转的