title: How can I make the flot library hovering circle effect stay upon clicking the plot?
body: <p>As of right now, I have a graph for which I would like to calculate an average slope. I would like to do this by having the user select a left point and a right point on a line. I know how to record where a person clicked, but I would also like to display the same circular hover effect where they clicked until they click on it again to turn it off. Is there a special flot method that would allow me to do this, or will I have to manipulate the flot documentation (how would I go about doing that if I need to)?<img src="https://i.stack.imgur.com/QiZg7.png" alt=""></p>