Interpolate between x0 and x1 to find the value at time t. Timestamp
of the result is given by t, value determined by interpolation. Quality
is good exactly if a sensible interpolation could be performed, which usually
involves the qualities of x0 and/or x1. The type of the sampled values
is given by valueType. It is assume that the timestamp of t0 preceeds or
equals t and that the timestamp of x1 equals of succeeds t.
Integrate from x0 to x1, assuming no further points lie between the two points. Result has
units of domain type times ms. Integration is defined only for integer and floating point
values. If the sampled values define an invalid integration range (e.g. either value has
a bad quality in linear interpolation), this returns zero. The timestamp of x0 must not be
larger than the timestamp of x1.
Gets the interval on which the interpolation between the two support points is positive.
The value at the lower timestamp may be zero for linear interpolation if none of the other
points is zero. The larger timestamp is exclusive in the resulting interval. For the
interpolation mode NONE, the 2nd argument is ignored (since this can return only a single
interval). Returns an empty interval if no suitable positive domain is found.