このサイトを見てるような人は、企業のホームページ制作を請けおって、その会社案内ページなんかにグーグルマップを張り込む仕事をしているような人だと思います。
でも、その会社案内ページを見る人って、会社へのルートを調べたりするのが主な用途ですよね？
そんなユーザー様のために、ルートを調べるひと手間を減らしてあげましょう。
こんな感じで、最寄り駅の「浜松町駅」から「東京タワー」へのルートを地図上に表示できます。 もちろん徒歩ルート以外にも、車や電車でのルート検索・表示も可能です。詳しくは 公式ドキュメント をどうぞ。
ソースは以下のとおり。（なんですが、ちょっと違った方法もこの後に記載します）
<div id="map-canvas" class="map-canvas" style="width:640px;height:480px;"></div>
<script type="text/javascript">
function initMap() {
var myLatlng = {lat: 35.658620, lng: 139.745417};
var map = new google.maps.Map(document.getElementById("map-canvas"), {
zoom: 16,
center: myLatlng,
});
var request = {
origin: "浜松町駅",
destination: "東京タワー",
travelMode: "WALKING"
};
var directionsService = new google.maps.DirectionsService();
directionsService.route(request, function(result, status) {
if (status == 'OK') {
var directionsDisplay = new google.maps.DirectionsRenderer();
directionsDisplay.setMap(map);
directionsDisplay.setDirections(result);
console.log(JSON.stringify(result));
}
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>ですが。
ある程度のアクセスがある企業だと、有料になるかもしれません
https://developers.google.com/maps/documentation/directions/usage-and-billing?hl=ja
なので、1回取得したルート（DirectionsService オブジェクト）は使いまわしちゃいましょう！
上のソースの 21 行目がキモ。
DirectionsService オブジェクトをもうソースに直で書いちゃう！
そうすればもう DirectionsService を呼び出さなくてもよくなっちゃう！
こんな感じ。
<div id="map-canvas" class="map-canvas" style="width:640px;height:480px;"></div>
<script type="text/javascript">
function initMap() {
var myLatlng = {lat: 35.658620, lng: 139.745417};
var map = new google.maps.Map(document.getElementById("map-canvas"), {
zoom: 16,
center: myLatlng,
});
var directionsDisplay = new google.maps.DirectionsRenderer();
var route = {"geocoded_waypoints":[{"geocoder_status":"OK","place_id":"ChIJK3eSBcaLGGARscstL2SO9ug","types":["establishment","point_of_interest","train_station","transit_station"]},{"geocoder_status":"OK","place_id":"ChIJCewJkL2LGGAR3Qmk0vCTGkg","types":["establishment","point_of_interest","premise"]}],"routes":[{"bounds":{"south":35.65538,"west":139.74541000000002,"north":35.6588,"east":139.75713000000002},"copyrights":"地図データ ©2018 Google, ZENRIN","legs":[{"distance":{"text":"1.4 km","value":1354},"duration":{"text":"17分","value":1031},"end_address":"日本、〒105-0011 東京都港区芝公園４丁目２−８","end_location":{"lat":35.6585795,"lng":139.7454282},"start_address":"日本、東京都港区海岸１丁目","start_location":{"lat":35.6553808,"lng":139.75713080000003},"steps":[{"building_level":{"number":2},"distance":{"text":"77 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