var generateContour = require("ndarray-extract-contour")

var getContour = generateContour({
  order: [1,0],         //Order of array iteration
  arrayArguments: 2,    //Take two arrays as input
  scalarArguments: 1,   //Take one extra scalar argument

  //Function to determine phase of a grid cell
  phase: function(a, b, s) { 

    //a = first array argument
    //b = second array argument
    //s = scalar argument

    return a
  },

  //Callback for adding vertex to array
  vertex: function(x,y, a00,a01,a10,a11,  b00,b01,b10,b11,  p00,p01,p10,p11, s) {

    //Geometry:
    //
    //   a11 ---- a10
    //    |        |
    //    |        |
    //    |        |
    //   a01 ---- a00
    //

    //Arguments:

    // x,y,...  = coordinates of vertex in grid index
    // a00,a01,...  = components of first array
    // b00,b01,...  = components of second array
    // p00,p01,...  = phase of all nearby cells
    // s,... = optional scalar arguments
    //
  },

  //Callback for adding cell
  cell: function(v0,v1,  a0,a1,  b0,b1,  p0,p1,  s) {

    // Geometry:
    //
    //       v0
    //       |
    //  p0   |    p1
    //       |
    //       v1


    //Arguments:
    //  v0,v1,...  = coordinates of vertices of cuboid cell
    //  a0,a1  = first array values on front/back cell
    //  b0,b1  = second array values on front/back cell
    //  p0,p1  = phase values for front/back cell
    //  s,... = optional scalar arguments
  }
})


//How to use it:
testContour(A, B, S)

npm install ndarray-extract-contour