@deck.gl/experimental-layers/dist/es6/path-marker-layer/arrow-2d-geometry.js

Experimental layers for deck.gl

import { Geometry } from 'luma.gl';
export default class Arrow2DGeometry extends Geometry {
  constructor() {
    let opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    super(Object.assign({}, opts, {
      attributes: getArrowAttributes(opts)
    }));
  }

}

function getArrowAttributes(_ref) {
  let _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;
  const 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];
  const 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

  const positions = new Array(texCoords.length);

  for (let i = 0; i < texCoords.length / 3; i++) {
    const 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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