Originally, most of the sources used constructor parameters to set the
various options of the source. Although convenient, it was difficult to
keep track of what each parameter meant. To make the code more clear,
source parameters are now set with accessor functions (e.g.
`SetPointDimensions`). Although this makes code more verbose, it helps
prevent mistakes and makes the changes more resilient to future changes.
This matches the output field name in VTK and ParaView for the
equivalent source. This change allows this source to be used as a drop-
in replacement for the VTK source (which could be very useful).
The `Tangle` source would create a point field generically named
`nodevar`. This name was not indicitive of the data or its source. Thus,
the output point field has been renamed `tangle`.
The `Tangle` source was also creating a cell field (named `cellvar`).
This field was really just a mirror of the cell indices (counting from 0
on up). This field has been removed from the input. If you want such a
field, you can now use the `GenerateIds` filter to add it to any data
set.
There was an error that caused deprecation warnings in VTK-m to be
suppressed, which meant that many uses of deprecated features went
unnoticed. This fixes those deprecation warnings.
The majority of the warnings were caused by the use of the deprecated
`Cast`, `CopyTo`, and `ResetTypes` methods of `UnknownArrayHandle` (or
`VariantArrayHandle`). Both `Cast` and `CopyTo` have been subsumed by
`AsArrayHandle` (to make the functionality more clear). `ResetTypes` now
requires a second template argument to define the storage types to try.
Also fixed some issues with `SerializableField` being deprecated.
This class is no longer necessary because `Field` can now be directly
serialized.
`vtkm::source::Source` now uses virtual inheritance for
the `Execute` method. This will allow us to enforce that
all vtkm::source have a consistent calling convention.
To make the code inside filters and sources more similar the
base `vtkm::source::Source` class has a `vtkm::cont::Invoker`
as a member variable. This will allow sources to use the
`this->Invoke()` pattern that filters use to launch worklets.
