Modify contents to demonstrate `Leaflet.js` shorcodes.
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@ -9,40 +9,227 @@ leaflet=true
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[Leaflet.js](https://leafletjs.com/)でMapboxのタイルを用いて地図を表示してみます:
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<div id="mapid"></div>
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{{< leaflet-map id="mapid" lat="35.7142" long="139.7774" >}}
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{{< leaflet-marker lat="35.7142" long="139.7774" msg="上野駅だよ" >}}
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{{< leaflet-circle lat="35.7237" long="139.7653" >}}
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<script>
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var mymap = L.map('mapid').setView([35.7142, 139.7774], 13)
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L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q', {
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attribution: 'Map data © <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
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maxZoom: 18,
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id: 'mapbox.streets',
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accessToken: 'pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q'
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}).addTo(mymap);
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var marker = L.marker([35.7142, 139.7774]).addTo(mymap);
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marker.bindPopup("<b>Hello world!</b><br>I am a popup.").openPopup();
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var polygon = L.polygon([
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[35.7173, 139.7657],
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[35.7142, 139.7774],
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[35.7068, 139.7700]
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]).addTo(mymap);
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</script>
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<script>
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function onEachFeature(feature, layer) {
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// does this feature have a property named popupContent?
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if (feature.properties && feature.properties.popupContent) {
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layer.bindPopup(feature.properties.popupContent);
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}
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}
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var geojsonFeature = {
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"type": "Feature",
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"properties": {
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"name": "御徒町駅",
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"amenity": "駅",
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"popupContent": "御徒町駅だよ"
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},
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"geometry": {
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"type": "Point",
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"coordinates": [139.7734, 35.7080]
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}
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};
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L.geoJSON(geojsonFeature, {
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onEachFeature: onEachFeature
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}).addTo(mymap);
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</script>
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<script>
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function onEachFeature(feature, layer) {
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// does this feature have a property named popupContent?
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if (feature.properties && feature.properties.popupContent) {
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layer.bindPopup(feature.properties.popupContent);
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}
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}
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var geojsonFeature = {
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"type": "Feature",
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"properties": {
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"name": "御徒町駅",
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"amenity": "駅",
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"popupContent": "御徒町駅だよ"
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},
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"geometry": {
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"type": "Point",
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"coordinates": [139.7734, 35.7080]
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}
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};
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L.geoJSON(geojsonFeature, {
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onEachFeature: onEachFeature
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}).addTo(mymap);
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</script>
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{{< leaflet-topojson url="https://raw.githubusercontent.com/dataofjapan/land/master/tokyo.topojson" >}}
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## コード
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こんな感じになります:
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チュートリアルなどにしたがって進めてみます。
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### 地図を表示する
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チュートリアルなどに従って地図を表示してみました。国土地理院・Open Street Map・Mapboxの3つのタイルを切り替えられるようにしてみました。
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地図は上野駅が中心になるように指定しています。
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```
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<div id="mapid"></div>
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<div id='mapid'></div>
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<script>
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var mymap = L.map('mapid').setView([35.7142, 139.7774], 13)
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// タイルレイヤーを作成する
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var cyberjapandata = L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/std/{z}/{x}/{y}.png', {
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maxZoom: 18,
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attribution: '© <a href="https://maps.gsi.go.jp/development/ichiran.html" target="_blank">国土地理院</a>',
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}),
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openstreetmap = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
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attribution: '© <a href="https://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a>'
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}),
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mapbox = L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q', {
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attribution: 'Map data © <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
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maxZoom: 18,
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id: 'mapbox.streets',
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accessToken: 'pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q'
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});
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L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=<access_token>' {
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attribution: 'Map data © <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
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maxZoom: 18,
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id: 'mapbox.streets',
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accessToken: 'access_token'
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}).addTo(mymap);
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var baseMaps = {
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"国土地理院": cyberjapandata,
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"OpenStreetMap": openstreetmap,
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"Mapbox": mapbox
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};
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var marker = L.marker([35.7142, 139.7774]).addTo(mymap);
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marker.bindPopup("<b>Hello world!</b><br>I am a popup.").openPopup();
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// 地図を作成する
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var mymap = L.map('mapid', {layers: [cyberjapandata]});
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L.control.layers(baseMaps).addTo(mymap);
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// 地図の中心座標とズームレベルを設定する
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mymap.setView([35.7142,139.7774], 13);
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</script>
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```
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### マーカーを設置する
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以下のように指定して、マーカーを設置します:
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```
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<script>
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var marker = L.marker(["35.7142", "139.7774"]).addTo(mymap);
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marker.bindPopup("上野駅だよ").openPopup();
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</script>
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```
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### サークルを設置する
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以下のように指定して、サークルを設置します:
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```
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<script>
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var circle = L.circle([35.7237, 139.7653], {
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color: 'red',
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fillColor: '#f03',
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fillOpacity: 0.5,
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radius: 500
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}).addTo(mymap);
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</script>
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```
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### ポリゴンを設置する
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複数の経度・緯度を指定し、その点を結んだ図形を描画します。
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```
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<script>
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var polygon = L.polygon([
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[35.7173, 139.7657],
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[35.7142, 139.7774],
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[35.7068, 139.7700]
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]).addTo(mymap);
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</script>
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```
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### GeoJSONからデータを読み込んで描画する
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こんな感じで描画できます:
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```
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<script>
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function onEachFeature(feature, layer) {
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// does this feature have a property named popupContent?
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if (feature.properties && feature.properties.popupContent) {
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layer.bindPopup(feature.properties.popupContent);
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}
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}
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var geojsonFeature = {
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"type": "Feature",
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"properties": {
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"name": "御徒町駅",
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"amenity": "駅",
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"popupContent": "御徒町駅だよ"
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},
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"geometry": {
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"type": "Point",
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"coordinates": [139.7734, 35.7080]
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}
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};
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L.geoJSON(geojsonFeature, {
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onEachFeature: onEachFeature
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}).addTo(mymap);
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</script>
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```
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### 外部のTopoJSONを読み込んで描画する
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GeoJSONだけでなく、TopoJSONという形式もあるようです。ここでは外部のTopoJSONを読み込んで、描画してみます。
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```
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<script>
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// Changing topojson to geojson
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L.TopoJSON = L.GeoJSON.extend({
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addData: function(jsonData) {
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if (jsonData.type === "Topology") {
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for (let key in jsonData.objects) {
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if (jsonData.objects.hasOwnProperty(key)) {
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let geojson = topojson.feature(jsonData, jsonData.objects[key]);
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L.GeoJSON.prototype.addData.call(this, geojson);
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}
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}
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} else {
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L.GeoJSON.prototype.addData.call(this, jsonData);
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}
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}
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});
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const topoLayer = new L.TopoJSON();
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fetch('https://raw.githubusercontent.com/dataofjapan/land/master/tokyo.topojson')
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.then(response => {
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return response.json();
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})
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.then(data => {
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topoLayer.addData(data);
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topoLayer.addTo(mymap);
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});
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</script>
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```
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## 参考
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- [Tutorials - Leaflet - a JavaScript library for interactive maps](https://leafletjs.com/examples.html)
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- [【JavaScript】fetchを使ったAPIデータの取得方法 | Web白熱教室](https://tsuyopon.xyz/2019/01/05/how-to-use-the-fetch-api-in-js/)
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- [Maps with Leaflet, TopoJSON & Chroma](http://blog.webkid.io/maps-with-leaflet-and-topojson/)
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- [leaflet.jsの地図に駅をプロットする - 小さなエンドウ豆](http://h-piiice16.hatenablog.com/entry/2017/06/11/104155)
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- [オープンデータを地図上に表示してみる | 深ノオト](http://www.inqsite.net/weblog/4538/)
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- [Leaflet.js を使って GeoJSON データを地図上に表示してみる その１ - Qiita](https://qiita.com/sin164/items/1ed25130fa5a1de00ea8)
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- [GitHub - dataofjapan/land](https://github.com/dataofjapan/land)
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- [GitHub - niiyz/JapanGeoGo: GeoJson of Japan.](https://github.com/niiyz/JapanGeoGo)
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- [Continental GeoJson · GitHub](https://gist.github.com/cmunns/76fb72646a68202e6bde)
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