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index.ts
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index.ts
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/*
* Copyright 2019 Google LLC. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// [START maps_geometry_encodings]
// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">
function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 14,
center: { lat: 34.366, lng: -89.519 },
}
);
const poly = new google.maps.Polyline({
strokeColor: "#000000",
strokeOpacity: 1,
strokeWeight: 3,
map: map,
});
// Add a listener for the click event
google.maps.event.addListener(map, "click", (event) => {
addLatLngToPoly(event.latLng, poly);
});
}
/**
* Handles click events on a map, and adds a new point to the Polyline.
* Updates the encoding text area with the path's encoded values.
*/
function addLatLngToPoly(
latLng: google.maps.LatLng,
poly: google.maps.Polyline
) {
const path = poly.getPath();
// Because path is an MVCArray, we can simply append a new coordinate
// and it will automatically appear
path.push(latLng);
// Update the text field to display the polyline encodings
const encodeString = google.maps.geometry.encoding.encodePath(path);
if (encodeString) {
(document.getElementById(
"encoded-polyline"
) as HTMLInputElement).value = encodeString;
}
}
// [END maps_geometry_encodings]
export { initMap };