Make lineInterpolate handle values outside of [0; 1]

[yannbriancon]

In the library, lines are actually line segments. Current implementation of lineInterpolate gives an interpolator that returns points outside of the line segment if values passed are outside the interval [0;1].

export function lineInterpolate(line){
  return t => t === 0 ? line[0] : t === 1 ? line[1] : pointTranslate(line[0], lineAngle(line), lineLength(line) * t);
}

The following change would allow passing any number value and get the appropriate point on the line segment:

export function lineInterpolate(line){
  return t => t <= 0 ? line[0] : t >= 1 ? line[1] : pointTranslate(line[0], lineAngle(line), lineLength(line) * t);
}

[HarryStevens]

Changing the function like that would constitute a breaking change, so I'd prefer not to do that.

However, what if I added a second argument, clamp, a boolean. It would default to false, but if you set it to true, it would restrict the input t to [0, 1]?

[yannbriancon]

Thanks for the new parameter 👍