@deck.gl/experimental-layers/dist/esm/path-marker-layer/arrow-2d-geometry.js

Experimental layers for deck.gl

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

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

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function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

import { Geometry } from 'luma.gl';

var Arrow2DGeometry =
/*#__PURE__*/
function (_Geometry) {
  _inherits(Arrow2DGeometry, _Geometry);

  function Arrow2DGeometry() {
    var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

    _classCallCheck(this, Arrow2DGeometry);

    return _possibleConstructorReturn(this, _getPrototypeOf(Arrow2DGeometry).call(this, Object.assign({}, opts, {
      attributes: getArrowAttributes(opts)
    })));
  }

  return Arrow2DGeometry;
}(Geometry);

export { Arrow2DGeometry as default };

function getArrowAttributes(_ref) {
  var _ref$length = _ref.length,
      length = _ref$length === void 0 ? 1 : _ref$length,
      _ref$headSize = _ref.headSize,
      headSize = _ref$headSize === void 0 ? 0.2 : _ref$headSize,
      _ref$tailWidth = _ref.tailWidth,
      tailWidth = _ref$tailWidth === void 0 ? 0.05 : _ref$tailWidth,
      _ref$tailStart = _ref.tailStart,
      tailStart = _ref$tailStart === void 0 ? 0.05 : _ref$tailStart;
  var texCoords = [// HEAD
  0.5, 1.0, 0, 0.5 - headSize / 2, 1.0 - headSize, 0, 0.5 + headSize / 2, 1.0 - headSize, 0, 0.5 - tailWidth / 2, tailStart, 0, 0.5 + tailWidth / 2, 1.0 - headSize, 0, 0.5 + tailWidth / 2, tailStart, 0, 0.5 - tailWidth / 2, tailStart, 0, 0.5 - tailWidth / 2, 1.0 - headSize, 0, 0.5 + tailWidth / 2, 1.0 - headSize, 0];
  var normals = [0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1]; // Center and scale

  var positions = new Array(texCoords.length);

  for (var i = 0; i < texCoords.length / 3; i++) {
    var i3 = i * 3;
    positions[i3 + 0] = (texCoords[i3 + 0] - 0.5) * length;
    positions[i3 + 1] = (texCoords[i3 + 1] - 0.5) * length;
    positions[i3 + 2] = 0;
  }

  return {
    positions: new Float32Array(positions),
    normals: new Float32Array(normals),
    texCoords: new Float32Array(texCoords)
  };
}
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