function getCoordinates()

in src/deckgl-layers/3d-building-layer/3d-building-utils.js [100:146]

• 36 lines of code
• 10 McCabe index (conditional complexity)

function getCoordinates(vectorTileFeature) {
  const pbf = vectorTileFeature._pbf;
  pbf.pos = vectorTileFeature._geometry;

  const end = pbf.readVarint() + pbf.pos;
  let cmd = 1;
  let length = 0;
  let x = 0;
  let y = 0;

  const lines = [];
  let line;

  while (pbf.pos < end) {
    if (length <= 0) {
      const cmdLen = pbf.readVarint();
      cmd = cmdLen & 0x7;
      length = cmdLen >> 3;
    }

    length--;

    if (cmd === 1 || cmd === 2) {
      x += pbf.readSVarint();
      y += pbf.readSVarint();

      if (cmd === 1) {
        // moveTo
        if (line) lines.push(line);
        line = [];
      }

      line.push([x, y]);
    } else if (cmd === 7) {
      // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
      if (line) {
        line.push(line[0].slice()); // closePolygon
      }
    } else {
      throw new Error(`unknown command ${cmd}`);
    }
  }

  if (line) lines.push(line);

  return lines;
}