Add a filter function to the translate interaction. This filter is similar to the one present in the select interaction options and provides the ability to dynamically filter which features to include in the translate interaction. Adding the existing "features" options allows further filtering to take place. In this case the filter is first applied, and features that are passing the filtering need to be present in the "features" options to be further kept. The default filter function always return true (no filtering).
Previously, an interaction could begin while target values
(center/resolution) were out of the allowed range, causing a
glitch where the view zoom/position would jump suddenly.
The DragPan, KeyboardPan and DragZoom interactions now make sure to
animate to a valid center/resolution target to avoid
a chained "resolve" animation which looks weird.
The `View.fit` method was also fixed to use this.
API changes:
* (breaking) the `rotate` method is gone
* the `adjustRotation`, `adjustResolution` and `adjustZoom` methods are now
available and allow using an anchor.
This means interactions do not have to do the anchor computation themselves
and this also fix anchor computation when constraints must be applied.
This introduces a breaking change.
This options replaces the various `constrainResolution` options on interactions
and the `fit` method.
Since constraints are now the responsibility of the View, the fact that intermediary
zoom levels are allowed or not is now set in the view options.
By default, the view resolution is unconstrained.
This is done by applying the center constraint differently when we're in the
middle of an interaction/animation or not.
When the view is moving, the center constraint will restrain the given value
in an "elastic" way, using a logarithmic function.
This can be disabled using the `smoothCenterConstrain` view parameter.
This will help making sure that the view will come back to a "rested" state
once the interactions are over.
Interactions no longer need to handle the animation back to a rested state,
they simply call `endInteraction` with the desired duration and direction.
The `getValidZoomLevel` apply the current resolution constraint to return
a value that is guaranteed valid.
This is used for interactions & controls which need a target value to work:
the +/- buttons, the zoom clider, the dragbox zoom and the mouse wheel zoom.
