feature: y = f(x=3)

[napster3000]

Hi,
Would be very useful the possibility to get the value of a line at a certain point.
For example, i have this line y = 4x + 23 and I would know what is its the value of "y" for "x=3". In this case y= 35 ;)

[bfoz]

That's a good idea. I'll need to think about the right way to implement it.

[napster3000]

Maybe something to find the point where two line intersect

[bfoz]

One thought I've had is to implement Line#at. Then the user could use line.at(3) to get the value of y when x = 3. That seems intuitive enough, but then how should TwoPointLine#at behave? If someone is trying to find the midpoint of a line segment, they might reasonably try to use line.at(0.5), which would do the wrong thing.

I'm still thinking about this one.