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  1. //These functions assume 'position' is of the _scale_ (0.0 to 1.0), though they can be outside that _range_.
  2.  
  3. //For consistency, this 'Coverts' an EaseIn function to... an EaseIn function. It doesn't actually do anything.
  4. inline float DoEaseIn(EaseFunction easeFunction, float position) { return easeFunction(position); }
  5.  
  6. //Converts a EaseIn function to an EaseOut function.
  7. float DoEaseOut(EaseFunction easeFunction, float position)
  8. {
  9. float result = easeFunction(1.0f - position);
  10. return (1.0f - result);
  11. }
  12.  
  13. //Converts a EaseIn function to an EaseInOut function.
  14. float DoEaseInOut(EaseFunction easeFunction, float position)
  15. {
  16. //If less than halfway, Ease-In.
  17. if(position < 0.5f)
  18. {
  19. //Doubles the positon to scales it from (0.0 - 0.5) to (0.0 - 1.0)
  20. float result = easeFunction(position * 2.0f);
  21.  
  22. //Scale to (0.0 - 0.5), by halfing the result.
  23. return (result * 0.5f);
  24. }
  25. //If more than halfway, Ease-Out.
  26. else
  27. {
  28. //Scales the position from (0.5 - 1.0) to (0.0 - 1.0)
  29. float result = DoEaseOut(easeFunction, (position * 2.0f) - 1.0f);
  30.  
  31. //Scale to (0.5 - 1.0), by halfing the result and then adding half.
  32. return (result * 0.5f) + 0.5f;
  33. }
  34. }
  35.  
  36. //Converts an EaseIn function to an EaseOutIn function.
  37. float DoEaseOutIn(EaseFunction easeFunction, float position)
  38. {
  39. //If less than halfway, Ease-Out.
  40. if(position < 0.5f)
  41. {
  42. //Doubles the positon to scales it from (0.0 - 0.5) to (0.0 - 1.0)
  43. float result = DoEaseOut(easeFunction, position * 2.0f);
  44.  
  45. //Scale to (0.0 - 0.5), by halfing the result.
  46. return (result * 0.5f);
  47. }
  48. //If more than halfway, Ease-In.
  49. else
  50. {
  51. //Scales the position from (0.5 - 1.0) to (0.0 - 1.0)
  52. float result = easeFunction((position * 2.0f) - 1.0f);
  53.  
  54. //Scale to (0.5 - 1.0), by halfing the result and then adding half.
  55. return (result * 0.5f) + 0.5f;
  56. }
  57. }
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