c++ opencv之画线画圆

以下代码在白色背景上画线画圆并保存为a12.jpg.

#include 
#include 
#include 
#include 
#include 
#include 
using namespace cv;
using namespace std;

/**
 * https://docs.opencv.org/4.6.0/index.html
 * https://docs.opencv.org/4.6.0/d6/d00/tutorial_py_root.html
 * https://docs.opencv.org/4.x/db/deb/tutorial_display_image.html
 * https://docs.opencv.org/4.6.0/d3/d96/tutorial_basic_geometric_drawing.html
 *
 * cmake  .
 * make
 * ./a
 */

int main(int argc, char **argv) {
	Mat img = imread("white.jpg", IMREAD_UNCHANGED);
	if (!img.data) {
		printf("No image data \n");
		return -1;
	}

	Point start = Point(0, 0);
	Point end = Point(600, 200);
	line(img, start, end, Scalar(0, 0, 255), 8, LINE_8);
	circle(img, Point(200, 200), 50, Scalar(0, 0, 255), FILLED, LINE_8);
	imwrite("a12.jpg", img);
	namedWindow("Display Image", WINDOW_FREERATIO);
	imshow("Display Image", img);
	int k = waitKey(0);
	return 0;
}

画线：

line(img, start, end, Scalar(0, 0, 255), 8, LINE_8);

画圆：

circle(img, Point(200, 200), 50, Scalar(0, 0, 255), FILLED, LINE_8);