Function interp2d

stackgl_modules/index.js:30081–30095

(arr, x, y)

}

function interp2d(arr, x, y) {
  var ix = Math.floor(x)
    , fx = x - ix
    , s0 = 0 <= ix   && ix   < arr.shape[0]
    , s1 = 0 <= ix+1 && ix+1 < arr.shape[0]
    , iy = Math.floor(y)
    , fy = y - iy
    , t0 = 0 <= iy   && iy   < arr.shape[1]
    , t1 = 0 <= iy+1 && iy+1 < arr.shape[1]
    , w00 = s0&&t0 ? arr.get(ix  ,iy  ) : 0.0
    , w01 = s0&&t1 ? arr.get(ix  ,iy+1) : 0.0
    , w10 = s1&&t0 ? arr.get(ix+1,iy  ) : 0.0
    , w11 = s1&&t1 ? arr.get(ix+1,iy+1) : 0.0
  return (1.0-fy) * ((1.0-fx)*w00 + fx*w10) + fy * ((1.0-fx)*w01 + fx*w11)
}

function interp3d(arr, x, y, z) {
  var ix = Math.floor(x)