The RangedTwoDimensionalFilter allows filtering all values which fit within a rectangular region. It is used by the scatter plot to implement rectangular brushing.
It takes two two-dimensional points in the form
[[x1,y1],[x2,y2]], and normalizes them so that
x1 <= x2 and
y1 <= y2. It then returns a filter which accepts any points which are in the
rectangular range including the lower values but excluding the higher values.
If an array of two values are given to the RangedTwoDimensionalFilter, it interprets the values as
two x coordinates
x2 and returns a filter which accepts any points for which
x1 <= x <
filterType is 'RangedTwoDimensionalFilter'