getHct method
Implementation
Hct getHct(DynamicScheme scheme) {
final cachedAnswer = _hctCache[scheme];
if (cachedAnswer != null) return cachedAnswer;
final answer = ColorSpecs.get(scheme.specVersion).getHct(scheme, this);
if (_hctCache.length > 4) _hctCache.clear();
_hctCache[scheme] = answer;
return answer;
}