opencv（12）随机绘制

最新推荐文章于 2023-10-14 08:44:41 发布

qq_44601476

最新推荐文章于 2023-10-14 08:44:41 发布

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分类专栏： opencv 文章标签： python opencv 计算机视觉

本文链接：https://blog.youkuaiyun.com/qq_44601476/article/details/125385755

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Mat canvas = Mat::zeros(Size(512, 512), CV_8UC3);
	int w = canvas.cols;
	int h = canvas.rows;
	RNG rng(12345);   //随机时间
	while (true) {
		int c = waitKey(10);
		if (c == 27) { // �˳�
			break;
		}
		int x1 = rng.uniform(0, w);  //uniform在0到w间选取一个数
		int y1 = rng.uniform(0, h);
		int x2 = rng.uniform(0, w);
		int y2 = rng.uniform(0, h);
		int b = rng.uniform(0, 255);
		int g = rng.uniform(0, 255);
		int r = rng.uniform(0, 255);
		// canvas = Scalar(0, 0, 0);
		line(canvas, Point(x1, y1), Point(x2, y2), Scalar(b, g, r), 1, LINE_AA, 0);
		imshow("���������ʾ", canvas);

	Mat canvas = Mat::zeros(Size(512, 512), CV_8UC3);
	int w = canvas.cols;
	int h = canvas.rows;
	Point p1(100, 100);
	Point p2(300, 150);
	Point p3(300, 350);
	Point p4(250, 450);
	Point p5(50, 450);
	std::vector<Point> pts;
	pts.push_back(p1);
	pts.push_back(p2);
	pts.push_back(p3);
	pts.push_back(p3);
	pts.push_back(p4);
	pts.push_back(p5);
	// polylines(canvas, pts, true, Scalar(0, 255, 0), -1, 8, 0);
	std::vector<std::vector<Point>> contours;
	contours.push_back(pts);
	drawContours(canvas, contours, 0, Scalar(0, 0, 255), -1, 8);
	imshow("���ƶ����", canvas);

drawContours(canvas, contours, 0, Scalar(0, 0, 255), -1, 8);

第一个零表示绘制容器中第几个点集，-1表示全部绘制，第二个-1为填充，正数为绘制线宽。