area.x1()

area.x1([x])

If x is specified, sets the x1 accessor to the specified function or number and returns this area generator. If x is not specified, returns the current x1 accessor, which defaults to null, indicating that the previously-computed x0 value should be reused for the x1 value.

When an area is generated, the x1 accessor will be invoked for each defined element in the input data array, being passed the element d, the index i, and the array data as three arguments. See area.x0 for more information.