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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].