src/geometry/grid.js

/**
 * @file Grid
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @private
 */

function Grid (length, width, height, DataCtor, elemSize) {
  DataCtor = DataCtor || Int32Array
  elemSize = elemSize || 1

  var j

  var data = new DataCtor(length * width * height * elemSize)

  function index (x, y, z) {
    return ((((x * width) + y) * height) + z) * elemSize
  }

  this.data = data

  this.index = index

  this.set = function (x, y, z) {
    var i = index(x, y, z)

    for (j = 0; j < elemSize; ++j) {
      data[ i + j ] = arguments[ 3 + j ]
    }
  }

  this.toArray = function (x, y, z, array, offset) {
    var i = index(x, y, z)

    if (array === undefined) array = []
    if (offset === undefined) offset = 0

    for (j = 0; j < elemSize; ++j) {
      array[ offset + j ] = data[ i + j ]
    }
  }

  this.fromArray = function (x, y, z, array, offset) {
    var i = index(x, y, z)

    if (offset === undefined) offset = 0

    for (j = 0; j < elemSize; ++j) {
      data[ i + j ] = array[ offset + j ]
    }
  }

  this.copy = function (grid) {
    this.data.set(grid.data)
  }

  this.clone = function () {
    return new Grid(
      length, width, height, DataCtor, elemSize
    ).copy(this)
  }
}

export default Grid