Interface for point-cloud traces that can be asked where one of their
layer's data points sits in their own navigation coordinates.
The inverse of PointCloudHighlightable: that one reports which
points the cursor is on, this one takes a point and answers with the cell
to move to. A host that was handed pointIndices can therefore send one of
them back -- the mark a sighted user clicked -- and the trace translates it
out of data order into whatever it navigates by.
Interface for point-cloud traces that can be asked where one of their layer's
datapoints sits in their own navigation coordinates.The inverse of PointCloudHighlightable: that one reports which points the cursor is on, this one takes a point and answers with the cell to move to. A host that was handed
pointIndicescan therefore send one of them back -- the mark a sighted user clicked -- and the trace translates it out of data order into whatever it navigates by.