/
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_earthquake_circles]
let map: google.maps.Map;
function initMap(): void {
map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
zoom: 2,
center: { lat: -33.865427, lng: 151.196123 },
mapTypeId: "terrain",
});
// Create a <script> tag and set the USGS URL as the source.
const script = document.createElement("script");
// This example uses a local copy of the GeoJSON stored at
// http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.geojsonp
script.src =
"https://developers.google.com/maps/documentation/javascript/examples/json/earthquake_GeoJSONP.js";
document.getElementsByTagName("head")[0].appendChild(script);
map.data.setStyle((feature) => {
const magnitude = feature.getProperty("mag");
return {
icon: getCircle(magnitude),
};
});
}
function getCircle(magnitude: number) {
return {
path: google.maps.SymbolPath.CIRCLE,
fillColor: "red",
fillOpacity: 0.2,
scale: Math.pow(2, magnitude) / 2,
strokeColor: "white",
strokeWeight: 0.5,
};
}
function eqfeed_callback(results: any) {
map.data.addGeoJson(results);
}
// [END maps_earthquake_circles]
export { initMap, eqfeed_callback };