@oazmi/kitchensink - v0.10.1
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    Function invlerp

    • get the inverse of the interpolation lerp(x0, x1, t), which is to say: find the UnitInterval parameter t, given a scalar number x in the closed interval [x0, x1].

      Parameters

      • x0: number
      • x1: number
      • x: number

      Returns number

      import { assertEquals } from "jsr:@std/assert"

      assertEquals(invlerp( 0, 100,   50),  0.5)
      assertEquals(invlerp(50, 100,   75),  0.5)
      assertEquals(invlerp(50, 100,   50),  0.0)
      assertEquals(invlerp(50, 100,  100),  1.0)
      assertEquals(invlerp(50, 100,  125),  1.5)
      assertEquals(invlerp(50, 100,   25), -0.5)
      assertEquals(invlerp(50, 100,    0), -1.0)
      assertEquals(invlerp(50, 100,  -75), -2.5)

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