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AboutAll PostsWarningRandom

Inverse of a Function

  1. const expoIn = t => 
  2.   (t==0) ? 0 : Math.pow(2, 10 * (t - 1))
  3.  
  4. const expoInInverse= t => 
  5.   (t==0) ? 0 : ((Math.log(t) + 10 * Math.log(2)) / Math.log(2)) / 10
  6.  
  7.  
  8. console.log(expoIn(.35) + ' ' +  expoInInverse(expoIn(.35)))

Very nice inverse function calculator by user fawad over at Wolfram Alpha. Was attempting to invert a standard “exponential in” easing function – after some futzing I resorted to the calculator 😀

// javascript // math

Normalize Value Between 0 and 1

  1. const d = document.body.appendChild(
  2.   document.createElement`div`)
  3. d.innerHTML = `
  4. <input 
  5.   id="input"
  6.   type="range" 
  7.   min="-2" max="5" 
  8.   value="0">
  9. `
  10.  
  11. let val = 0;
  12.  
  13. console.log('drag slider...')
  14.  
  15. const range = (input.max - input.min);
  16.  
  17. input.oninput = () => {
  18.   val = (input.value - input.min) / range
  19.   console.log(input.value + ' - normalized = ' + val)
  20. }
// html // javascript // math // ui

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