c# - How can I tell if a point is nearby a certain line?

Question

I asked "How can I tell if a point belongs to a certain line?" before and I found a suitable answer so thank you very much.

Now, I would like to know how to tell if a certain point is close to my line.

Answer 1

You need to calculate the right angle distance to the line. Then you have to define what "close" is and test if it is within that distance.

The equation you want is: