linear interpolation?

Programming Questions

neon_c

in Programming Questions • 2 years ago

So i'm trying to get from number A (offset) to number B(target) in the period of time specified (period) | time (time) is always increasing.

(formula not code)

i = offset + time * ( (target - offset) / period)

when i graph it out on a graphing calculator it seems to work, but i'm having problems translating it to code.

http://gcalc.net/

5+x*( (10-5) /15)

(5 = offset, x = time, 10 = target, 15 = period)

Replies(2)

PhiLho

An advice: keep the identifiers names, it will be clearer and easier to experiment with than with "magic numbers".
Next, I haven't understood where you are stuck? Writing the formula? Making the time to advance? Plotting at time (x) and i (y) positions?

kooogy

Re: linear interpolation?

2 years ago

i smell the usual integer division problem - it rounds down when you use integers. do as phil says and use variables, and make the variables floats and it'll work

println((10 - 5) / 15); // 0

println((10 - 5) / 15.0); // 0.3333334

also, look up lerp() in the reference.