我写了这段代码在opencv MAT图像上绘制块箭头，它可以工作，但我的问题是，有没有更简单的方法来旋转图像？是否需要详细编码或者opencv中是否有旋转转置或翻转方法？
void Arrow( Mat img, int i )
{
int lineType = 8;
Point arrow_points[1][7];
if (i == 1) { //left
arrow_points[0][0] = Point( 90*mp, 60*mp );
arrow_points[0][1] = Point( 90*mp, 40*mp );
arrow_points[0][2] = Point( 50*mp, 40*mp );
arrow_points[0][3] = Point( 50*mp, 30*mp );
arrow_points[0][4] = Point( 10*mp, 50*mp );
arrow_points[0][5] = Point( 50*mp, 70*mp );
arrow_points[0][6] = Point( 50*mp, 60*mp );
};
if (i == 2) { //right
arrow_points[0][0] = Point( 20*mp, 60*mp );
arrow_points[0][1] = Point( 20*mp, 40*mp );
arrow_points[0][2] = Point( 60*mp, 40*mp );
arrow_points[0][3] = Point( 60*mp, 30*mp );
arrow_points[0][4] = Point( 100*mp, 50*mp );
arrow_points[0][5] = Point( 60*mp, 70*mp );
arrow_points[0][6] = Point( 60*mp, 60*mp );
};
if (i == 3) { //down
arrow_points[0][0] = Point( 60*mp, 20*mp );
arrow_points[0][1] = Point( 40*mp, 20*mp );
arrow_points[0][2] = Point( 40*mp, 60*mp );
arrow_points[0][3] = Point( 30*mp, 60*mp );
arrow_points[0][4] = Point( 50*mp, 100*mp );
arrow_points[0][5] = Point( 70*mp, 60*mp );
arrow_points[0][6] = Point( 60*mp, 60*mp );
};
const Point* ppt[1] = { arrow_points[0] };
int npt[] = { 7 };
fillPoly( img,
ppt,
npt,
1,
Scalar( 250, 0, 0 ),
lineType );
}