No prob with this:
cv::line(color_img, points[0], points[1], Scalar(255, 255, 255), 1, LINE_8, 0);How can I extend the line beyond each point(s). A different OpenCV fx?
There is no function to extend a line in OpenCV. Fortunately this is a simple geometry problem.
The formula for your line is:
P = points[0]+i*(points[1]-points[0])where i in [0...1]. To draw a line just make a loop and set every P to a desired color.
To extend a line beyond the endpoints, just increase the range of i. Negative values will extend beyond point[0], values greater than 1 beyond point[1].
Thanks for the answer. Wanted to further clarify implementation. Does P need to be an array of points?
e Point2d P;
for (int i = 0; i < 3; i++)
{
P = point[0] + i * (point[1] - point[0]);
cv::line(img_color, point[0], point[1], Scalar(255, 0, 0), 1, LINE_8, 0);
}nter code hereObviously my cv::line needs some reference to P. What would be the programming step.
Asked: Nov 11 '0
Seen: 2,041 times
Last updated: Nov 11 '20