Point Evaluators

struct PointEvaluator{T<:Real, Tv<:Real, Ti<:Integer, FEType<:AbstractFiniteElement, FEOP<:??, AT<:AssemblyType, ACT<:AbstractAction}

structure that allows to evaluate a FEVectorBlock at arbitrary points

function PointEvaluator(FEB::FEVectorBlock, FEOP::AbstractFunctionOperator, action::AbstractAction = NoAction(); AT = ON_CELLS)

constructor for PointEvaluator that evaluate the given FEVectorBlock with the specified operator (possibly postprocessed by an action) at arbitrary points inside entities of the given assembly type

function evaluate!(
    result,                     # target for result
    PE::PointEvaluator,         
    xref,                       # local coordinates inside item
    item                        # item number
    ) where  {T, Tv, Ti, FEType, FEOP, AT, ACT}

Evaluates the PointEvaluator at the point with the given local coordinates insides the item with the specified item number. (To get the local coordinates, currently a CellFinder has to be maintained manually, this might change in future.)

function evaluate(PE::PointEvaluator)

Returns the function (result,xref,cell) –> evaluate!(result,PE,xref,cell)

(e.g. to be used as a callback function in vectorplot!)