warriorjs-engine/lib/Position.js

The bowels of WarriorJS

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = undefined;

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _directions = require('./constants/directions');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Position = function () {
  function Position(floor, x, y) {
    var direction = arguments.length <= 3 || arguments[3] === undefined ? _directions.NORTH : arguments[3];

    _classCallCheck(this, Position);

    this._floor = floor;
    this._x = x;
    this._y = y;
    this._directionIndex = _directions.DIRECTION_ARRAY.indexOf(direction);
  }

  _createClass(Position, [{
    key: 'isAt',
    value: function isAt(x, y) {
      return this.x === x && this.y === y;
    }
  }, {
    key: 'move',
    value: function move(forward) {
      var right = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];

      var _translateOffset2 = this._translateOffset(forward, right);

      var _translateOffset3 = _slicedToArray(_translateOffset2, 2);

      this._x = _translateOffset3[0];
      this._y = _translateOffset3[1];
    }
  }, {
    key: 'rotate',
    value: function rotate(amount) {
      this._directionIndex += amount;
      while (this._directionIndex > 3) {
        this._directionIndex -= 4;
      }while (this._directionIndex < 0) {
        this._directionIndex += 4;
      }
    }
  }, {
    key: 'getRelativeSpace',
    value: function getRelativeSpace(forward) {
      var right = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];

      var _translateOffset4 = this._translateOffset(forward, right);

      var _translateOffset5 = _slicedToArray(_translateOffset4, 2);

      var x = _translateOffset5[0];
      var y = _translateOffset5[1];

      return this.floor.getSpaceAt(x, y);
    }
  }, {
    key: 'getDistanceOf',
    value: function getDistanceOf(space) {
      var _space$location = _slicedToArray(space.location, 2);

      var x = _space$location[0];
      var y = _space$location[1];

      return Math.abs(this.x - x) + Math.abs(this.y - y);
    }
  }, {
    key: 'getDistanceFromStairs',
    value: function getDistanceFromStairs() {
      return this.getDistanceOf(this.floor.stairsSpace);
    }
  }, {
    key: 'getDirectionOf',
    value: function getDirectionOf(space) {
      var _space$location2 = _slicedToArray(space.location, 2);

      var x = _space$location2[0];
      var y = _space$location2[1];

      if (Math.abs(this.x - x) > Math.abs(this.y - y)) {
        return x > this.x ? _directions.EAST : _directions.WEST;
      }

      return y > this.y ? _directions.SOUTH : _directions.NORTH;
    }
  }, {
    key: 'getRelativeDirection',
    value: function getRelativeDirection(direction) {
      var offset = _directions.DIRECTION_ARRAY.indexOf(direction) - this._directionIndex;
      while (offset > 3) {
        offset -= 4;
      }while (offset < 0) {
        offset += 4;
      }return _directions.RELATIVE_DIRECTION_ARRAY[offset];
    }
  }, {
    key: 'getRelativeDirectionOf',
    value: function getRelativeDirectionOf(space) {
      return this.getRelativeDirection(this.getDirectionOf(space));
    }
  }, {
    key: 'getRelativeDirectionOfStairs',
    value: function getRelativeDirectionOfStairs() {
      return this.getRelativeDirectionOf(this.floor.stairsSpace);
    }
  }, {
    key: '_translateOffset',
    value: function _translateOffset(forward, right) {
      if (this.direction === _directions.NORTH) {
        return [this.x + right, this.y - forward];
      } else if (this.direction === _directions.EAST) {
        return [this.x + forward, this.y + right];
      } else if (this.direction === _directions.SOUTH) {
        return [this.x - right, this.y + forward];
      } else if (this.direction === _directions.WEST) {
        return [this.x - forward, this.y - right];
      }

      throw new Error('Unknown direction \'' + this.direction + '\'');
    }
  }, {
    key: 'floor',
    get: function get() {
      return this._floor;
    }
  }, {
    key: 'x',
    get: function get() {
      return this._x;
    }
  }, {
    key: 'y',
    get: function get() {
      return this._y;
    }
  }, {
    key: 'space',
    get: function get() {
      return this.floor.getSpaceAt(this.x, this.y);
    }
  }, {
    key: 'direction',
    get: function get() {
      return _directions.DIRECTION_ARRAY[this._directionIndex];
    }
  }]);

  return Position;
}();

exports.default = Position;