Here is the code snippet along with the variable 'polygon':
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var bermudaTriangle;
var directionsPoints;
var example;
var rez;
function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var chicago = new google.maps.LatLng(41.850033, -87.6500523);
var mapOptions = {
zoom:7,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: chicago
}
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
directionsDisplay.setMap(map);
}
function calcRoute() {
var start = document.getElementById('start').value;
var end = document.getElementById('end').value;
var request = {
origin:start,
destination:end,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
directionsPoints= response.routes[0].overview_path;
//To transform directionsPoints into the desired format
example= [[{"X":72,"Y":59.45},{"X":136,"Y":66},{"X":170,"Y":99},{"X":171,"Y":114},{"X":183,"Y":125},{"X":218,"Y":144},{"X":218,"Y":165},{"X":226,"Y":193},{"X":254,"Y":195},{"X":283,"Y":195},{"X":292,"Y":202},{"X":325,"Y":213},{"X":341,"Y":234},{"X":397,"Y":245},{"X":417,"Y":248}]];
function draw() {
var polygons = response.routes[0].overview_path;
var scale = 100;
reverse_copy(polygons);
polygons = scaleup(polygons, scale);
var cpr = new ClipperLib.Clipper();
var delta = 25;
var joinType = ClipperLib.JoinType.jtRound;
var miterLimit = 2;
var AutoFix = true;
var svg, offsetted_polygon,
cont = document.getElementById('map-canvas');
offsetted_polygon = cpr.OffsetPolygons(polygons, delta * scale, joinType, miterLimit, AutoFix);
console.log(JSON.stringify(offsetted_polygon));
svg = polys2path(offsetted_polygon, scale);
rez= polys2path(offsetted_polygon, scale);
bermudaTriangle = new google.maps.Polygon({
paths: svg,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
bermudaTriangle.setMap(map);
}
// helper function to scale up polygon coordinates
function scaleup(poly, scale) {
var i, j;
if (!scale) scale = 1;
for(i = 0; i < poly.length; i++) {
for(j = 0; j < poly[i].length; j++) {
poly[i][j].lb *= scale;
poly[i][j].mb *= scale;
}
}
return poly;
}
// converts polygons to SVG path string
function polys2path (poly, scale) {
var path = "", i, j;
if (!scale) scale = 1;
for(i = 0; i < poly.length; i++) {
for(j = 0; j < poly[i].length; j++){
if (!j) path += "M";
else path += "L";
path += (poly[i][j].lb / scale) + ", " + (poly[i][j].mb / scale);
}
path += "Z";
}
return path;
}
function reverse_copy(poly) {
// Make reverse copy of polygons = convert polyline to a 'flat' polygon ...
var k, klen = poly.length, len, j;
for (k = 0; k < klen; k++) {
len = poly[k].length;
poly[k].length = len * 2 - 2;
for (j = 1; j <= len - 2; j++) {
poly[k][len - 1 + j] = {
lb: poly[k][len - 1 - j].lb,
mb: poly[k][len - 1 - j].mb
}
}
}
}
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
The task at hand involves transforming the variable polygons, defined as response.routes[0].overview_path, into a format similar to the provided example:
example= [[{"X":72,"Y":59.45},{"X":136,"Y":66},{"X":170,"Y":99},{"X":171,"Y":114},{"X":183,"Y":125},{"X":218,"Y":144},{"X":218,"Y":165},{"X":226,"Y":193},{"X":254,"Y":195},{"X":283,"Y":195},{"X":292,"Y":202},{"X":325,"Y":213},{"X":341,"Y":234},{"X":397,"Y":245},{"X":417,"Y":248}]];
You can explore the complete code with an interactive demo here.