How to use @turf/envelope - 8 common examples

test("match lines 1", async (t:any) => { 
 
   // test polygon (dc area)
   const content = fs.readFileSync('test/geojson/sf_centerlines.sample.geojson');
   var linesIn:turfHelpers.FeatureCollection = JSON.parse(content.toLocaleString());
   
   var cleanedLines = new CleanedLines(linesIn);  
   var lines:turfHelpers.FeatureCollection = turfHelpers.featureCollection(cleanedLines.clean);
 
   var params = new TilePathParams();
   params.source = 'osm/planet-180430';
   params.tileHierarchy = 6;
 
  //test matcher point candidates
  var matcher = new Graph(envelope(lines), params);
  await matcher.buildGraph();
  
  var matchedLines = turfHelpers.featureCollection([]);
  for(var line of lines.features) {
    var pathCandidate = await matcher.matchGeom(line);
    matchedLines.features.push(pathCandidate.matchedPath);
  }
  
  const expected_1a_file = 'test/geojson/sf_centerlines.sample.out.geojson';
  if(BUILD_TEST_OUPUT) {
    var expected_1a_out:string = JSON.stringify(matchedLines);
    fs.writeFileSync(expected_1a_file, expected_1a_out);
  }
 
  const expected_1a_in = fs.readFileSync(expected_1a_file);
  const expected_1a:{} = JSON.parse(expected_1a_in.toLocaleString());

test("sharedstreets -- graph test", async (t:any) => {
 
  var params = new TilePathParams();
  params.source = 'osm/planet-181224';
  params.tileHierarchy = 7;

  // test polygon (dc area)
  const content = fs.readFileSync('test/geojson/test_route.geojson');
  var lineIn:turfHelpers.FeatureCollection = JSON.parse(content.toLocaleString());
  var graph = new Graph(envelope(lineIn), params);
  await graph.buildGraph();

  t.equal(graph.id, 'd626d5b0-0dec-3e6f-97ff-d9712228a282');
  
  var results = await graph.matchGeom(lineIn.features[0]);
  lineIn.features[0].geometry.coordinates.reverse();
  var results2 = await graph.matchGeom(lineIn.features[0]);



  t.end();

 });

async function getMatcher() {
  // TODO - move TilePathParams into here 
  // const params = new TilePathParams();
  const params: any = {};
  // params.source = flags['tile-source'];
  params.source = "osm/planet-181224";
  // params.tileHierarchy = flags['tile-hierarchy']
  params.tileHierarchy = 6;
  const extent = envelope(bboxPolygon(extentFromEnv));
  const graphs = new sharedstreets.Graph(extent, params, 'car_all');
  await graphs.buildGraph();
  // console.log("graph built");  
  graphs.searchRadius = 25;
  graphs.snapIntersections = true;
  return graphs;
}

const {
    id,
    poi: poiByType,
    villages,
    osrmFile,
    adminArea,
    gridSize,
    maxTime,
    maxSpeed
  } = e;

  const osrm = new OSRM(osrmFile);
  process.send({type: 'status', data: 'srv_loaded_files', id: id});

  // Split the input region in squares for parallelisation.
  let box = envelope(adminArea);
  let extent = [box.geometry.coordinates[0][0][0], box.geometry.coordinates[0][0][1], box.geometry.coordinates[0][2][0], box.geometry.coordinates[0][2][1]];
  let squares = squareGrid(extent, gridSize || 30, 'kilometers').features;
  process.send({type: 'squarecount', data: squares.length, id: id});

  // Create a task for each square to be run below.
  var squareTasks = squares.map(square => {
    // Clip the square with the input geometry. In this way we work with a
    // smaller area..
    let workArea = intersect(adminArea, square);
    return createProcessAreaTask(workArea, poiByType, villages, osrm, maxTime, maxSpeed, id);
  });

  async.parallelLimit(squareTasks, config.cpus, (err, allSquaresRes) => {
    if (err) {
      throw err;
    }

async function getMatcher() {
    var params = new TilePathParams();
    // params.source = flags['tile-source'];
    params.source = "osm/planet-181224";
    // params.tileHierarchy = flags['tile-hierarchy']
    params.tileHierarchy = 6;
    const extent = envelope(extentFile);
    const matcher = new Graph(extent, params, GraphMode.CAR_ALL);
    await matcher.buildGraph();
    // console.log("graph built");
    matcher.searchRadius = 25;
    matcher.snapIntersections = true;
    return matcher;
}

async function matchLines(outFile, params, lines, flags) {

  var cleanedlines = new CleanedLines(lines);
  
  console.log(chalk.bold.keyword('green')('  ✨  Matching ' + cleanedlines.clean.length + ' lines...'));
  
  var extent = envelope(lines);
  var matcher = new Graph(extent, params);

  var matchedLines:turfHelpers.Feature[] = [];
  var unmatchedLines:turfHelpers.Feature[] = [];

  for(var line of cleanedlines.clean) {

    var bearing:number =null;
  
    var matches1 = await matcher.match(line);

    line.geometry.coordinates.reverse()
    var matches2 = await matcher.match(line);
    
    var bestMatch = null;
    if(matches1 && matches2 ) {

export function envelopeBufferFromPoint(point, radius):turfHelpers.Feature {
    var nwPoint = destination(point, radius, 315, {'units':'meters'});
    var sePoint = destination(point, radius, 135, {'units':'meters'});
    return envelope(turfHelpers.featureCollection([nwPoint, sePoint]));
}

getEnvelope() {
        if (this.envelope)
            return this.envelope;
        return (this.envelope = envelope(this.toPolygon()));
    }