【OpenCV】图形绘制函数的用法(Drawing Functions)（C++）

1.Circles

void circle(Mat& img, Point center, int radius, const Scalar& color, int thickness=1, int lineType=8, int shift=0)

Parameters:

img – Image where the circle is drawn. center – Center of the circle. radius – Radius of the circle. color – Circle color. thickness – Thickness of the circle outline, if positive. Negative thickness means that a filled circle is to be drawn. lineType – Type of the circle boundary. See the line() description. shift – Number of fractional bits in the coordinates of the center and in the radius value.（偏移量）

 

 2.clipLine

bool clipLine(Size imgSize, Point& pt1, Point& pt2)

bool clipLine(Rect imgRect, Point& pt1, Point& pt2)

判断线段是否在矩形内

Parameters:	imgSize – Image size. The image rectangle is Rect(0, 0, imgSize.width, imgSize.height) .