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// This example creates circles on the map, representing populations in North // America. // First, create an object containing LatLng and population for each city. var citymap = { chicago: { center: {lat: 41.878, lng: -87.629}, population: 2714856 }, newyork: { center: {lat: 40.714, lng: -74.005}, population: 8405837 }, losangeles: { center: {lat: 34.052, lng: -118.243}, population: 3857799 }, vancouver: { center: {lat: 49.25, lng: -123.1}, population: 603502 } }; function initMap() { // Create the map. var map = new google.maps.Map(document.getElementById('map'), { zoom: 4, center: {lat: 37.090, lng: -95.712}, mapTypeId: 'terrain' }); // Construct the circle for each value in citymap. // Note: We scale the area of the circle based on the population. for (var city in citymap) { // Add the circle for this city to the map. var cityCircle = new google.maps.Circle({ strokeColor: '#FF0000', strokeOpacity: 0.8, strokeWeight: 2, fillColor: '#FF0000', fillOpacity: 0.35, map: map, center: citymap[city].center, radius: Math.sqrt(citymap[city].population) * 100 }); } }
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!-- Replace the value of the key parameter with your own API key. --> <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"> </script>
実際に試す
コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。
<!DOCTYPE html> <html> <head> <meta name="viewport" content="initial-scale=1.0, user-scalable=no"> <meta charset="utf-8"> <title>Circles</title> <style> /* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } </style> </head> <body> <div id="map"></div> <script> // This example creates circles on the map, representing populations in North // America. // First, create an object containing LatLng and population for each city. var citymap = { chicago: { center: {lat: 41.878, lng: -87.629}, population: 2714856 }, newyork: { center: {lat: 40.714, lng: -74.005}, population: 8405837 }, losangeles: { center: {lat: 34.052, lng: -118.243}, population: 3857799 }, vancouver: { center: {lat: 49.25, lng: -123.1}, population: 603502 } }; function initMap() { // Create the map. var map = new google.maps.Map(document.getElementById('map'), { zoom: 4, center: {lat: 37.090, lng: -95.712}, mapTypeId: 'terrain' }); // Construct the circle for each value in citymap. // Note: We scale the area of the circle based on the population. for (var city in citymap) { // Add the circle for this city to the map. var cityCircle = new google.maps.Circle({ strokeColor: '#FF0000', strokeOpacity: 0.8, strokeWeight: 2, fillColor: '#FF0000', fillOpacity: 0.35, map: map, center: citymap[city].center, radius: Math.sqrt(citymap[city].population) * 100 }); } } </script> <script async defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"> </script> </body> </html>