lerp
lerp(
a,b,t):number
Defined in: lerp.ts:30
Blends smoothly between two values — t = 0 gives a, t = 1 gives b,
and 0.5 gives the midpoint.
The workhorse behind animation easing, colour blending, fading between two measurements, and reading a value off a curve you only sampled at intervals.
t outside [0, 1] extrapolates rather than clamping, which is often what
you want and occasionally a bug; clamp it yourself if it should not.
Computed as a + (b - a) * t, which is exact at t = 0 but not guaranteed
exact at t = 1 when a and b differ greatly in magnitude. If hitting
both endpoints exactly matters — sampling a function that is singular at one
end, for instance — use linspace, which is built for that.
O(1) time, O(1) memory.
Parameters
Section titled “Parameters”number
Start value, returned at t = 0.
number
End value, approached as t reaches 1.
number
Interpolation factor. Typically in [0, 1].
Returns
Section titled “Returns”number
The interpolated value.
Example
Section titled “Example” lerp(0, 100, 0.25); // 25 lerp(10, 20, 1.5); // 25 — extrapolates past the end ```;
## See
[linspace](linspace.md) for a whole sequence of samples.