call method
Implementation
double call(double x,[double? y, double? z]){
switch (values[index]) {
case linear:
return _linear(x);
case easeIn:
return _easeIn(x);
case easeOut:
return _easeOut(x);
case easeInOut:
return _easeInOut(x);
case inEaseOut:
return _inEaseOut(x);
case easeInWeak:
return _easeInWeak(x);
default:
return _easeInStrong(x);
}
}