Domů » Martin Owens » Resources » PasteBin » Average functions
  1. /**
  2. * Modify this color to be the average between two colors, modifying the first.
  3. *
  4. * @arg other - The other color to average with
  5. * @arg pos - The position (i.e. t) between the two colors.
  6. * @pin pin - Which channels should not change. 1=0,2=1,4=2,etc
  7. */
  8. void Color::averageInPlace(Color const &other, double pos, unsigned int pin)
  9. {
  10. _average_method_inplace(AverageMethod::Mean, other, pos, pin);
  11. }
  13. /**
  14. * Move towards the other color by the given weight.
  15. *
  16. * @arg other - The other color to move towards with
  17. * @arg pos - The weight to give the other color when mixing.
  18. * @pin pin - Which channels should not change. 1=0,2=1,4=2,etc
  19. */
  20. void Color::moveTowardsInPlace(Color const &other, double weight, unsigned int pin)
  21. {
  22. _average_method_inplace(AverageMethod::Weight, other, pos, pin);
  23. }
  25. void Color::_average_method_inplace(AverageMethod method, Color const &other, double weight, unsigned int pin)
  26. {
  27. // 1. If other is bad, return without action
  28. if (!other)
  29. return;
  31. // 2. If this is bad, modify to be equal to other
  32. if (_values.empty()) {
  33. _values = other._values;
  34. _space = other._space;
  35. return;
  36. }
  38. // 3. Convert the other's space if it's different
  39. if (_space && other._space != _space)
  40. return _average_method_inplace(method, other.convert(_space), weight, pin);
  42. // 4. Ensure opacity is compatible
  43. if (!hasOpacity() && other.hasOpacity())
  44. addOpacity(1.0); // Enable opacity if needed
  46. // 5. Both are good, so average each channel
  47. for (unsigned int i = 0; i < _values.size(); i++) {
  48. if (pin & (1 << i))
  49. continue;
  50. if (method == AverageMethod::Position) {
  51. // Note, other[i] returns 1.0 if the opacity is not set on other.
  52. _values[i] = _values[i] * (1 - weight) + other[i] * weight;
  53. } else if (method == AverageMethod::Weight) {
  54. // Move towards
  55. _values[i] += (other[i] - _values[i]) * force;
  56. }
  57. }
  58. }
 
 

232

Average functions

od Martin Owens

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PasteBin

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Public Domain (PD)
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