データ対象物にスタイルを適用するには、データセット地図レイヤの style
プロパティを google.maps.FeatureStyleFunction
関数に設定し、この関数にスタイル設定ロジック(つまり google.maps.FeatureStyleOptions
)を追加することで、レイヤ内のすべての対象物のスタイルを均一にします。データ対象物へのスタイル適用は、塗りつぶし(色、不透明度)、ストローク(色、不透明度、ストロークの太さ)、直径(ポイント数)について行うことが可能です。このページでは、プログラマティックにデータセットにアクセスして対象物をスタイル設定する方法を説明し、ポイント、ポリゴン、ポリラインの各ジオメトリに応じてデータ対象物をスタイル設定する例を紹介します。
データセットを対象とするデータドリブン スタイル設定では、データセットの作成に使った地理空間データファイルで指定されている緯度と経度をもとに、データ対象物をレンダリングします。
データ対象物の属性
データセット内のすべてのデータには、対象物スタイル関数でアクセスできます。データ対象物の属性を取得するには、まずデータセット内のすべてのデータを含むデータセット対象物を取得し、次に目的のデータ属性を取得します。コードは次のようになります。
TypeScript
// Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes['CombinationofPrimaryandHighlightColor'];
JavaScript
// Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes["CombinationofPrimaryandHighlightColor"];
対象物のスタイル オプション
データ対象物レイヤのスタイル設定(たとえばポリゴンの塗りつぶしとストローク、ポイントの色と直径など)は、対象物のスタイル オプションで定義します。次の例では、対象物の style
プロパティを使って直接適用できる、対象物のスタイル オプションを示しています。
TypeScript
// Apply style to all features. datasetLayer.style = { strokeColor: 'green', strokeWeight: 4, };
JavaScript
// Apply style to all features. datasetLayer.style = { strokeColor: "green", strokeWeight: 4 };
対象物スタイル関数
データセット対象物をスタイル設定するロジックを定義するには、対象物スタイル関数を使用します。対象物をスタイル設定するには、その style
プロパティを google.maps.FeatureStyleFunction
関数に設定します。スタイル関数では、地図レイヤに含まれる個々の対象物をスタイル設定するロジックを定義します。featureLayer.style
を設定すると、影響を受ける地図レイヤ内のすべての対象物でスタイル関数が実行されます。この関数は、スタイル プロパティの設定時に適用されます。更新するには、スタイル プロパティを設定し直す必要があります。単純な対象物スタイル関数の例を次に示します。
TypeScript
const styleDefault = { strokeColor: 'green', strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: 'green', fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: 'blue', fillColor: 'blue', fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0 }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if (lastClickedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleClicked; } //@ts-ignore if (lastInteractedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleMouseMove; } return styleDefault; }
JavaScript
const styleDefault = { strokeColor: "green", strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: "green", fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: "blue", fillColor: "blue", fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0, }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if ( lastClickedFeatureIds.includes(datasetFeature.datasetAttributes["globalid"]) ) { return styleClicked; } //@ts-ignore if ( lastInteractedFeatureIds.includes( datasetFeature.datasetAttributes["globalid"], ) ) { return styleMouseMove; } return styleDefault; }
スタイル関数は、対象物に適用した際に、常に同じ結果を返すように記述しましょう。たとえば特定の対象物をランダムに色付けしたい場合、予期しない結果を招かないよう、ランダム処理は対象物スタイル関数の外で行います。この関数はレイヤ内のすべての対象物に対して実行されるため、最適化が重要です。レンダリングの所要時間に影響しないよう、レイヤが不要になったときはスタイルを null
に設定しましょう。
ポイントデータのスタイル設定例
この例では、ポイント ジオメトリ ベースのデータ対象物をスタイル設定する際のアプローチを示します。
データセットについて
この例で使用しているデータセットは、ニューヨーク市のセントラル パークで 2018 年に実施されたリスについての調査の結果です。CSV データファイルから抜粋した次の表からわかるとおり、ジオグラフィ情報としては「x
」および「y
」列が使用されています。緯度と経度をまとめた「LatLng
」という列も存在しますが、地理的な位置情報は 2 列に分かれている必要があるため、この例では使用されていません。リスの調査のデータセットには、観察されたリスの体色や行動に関する多種多様なデータポイントが含まれています(ぜひ水平スクロールして全体を眺めてください)。
X | Y | UniqueSquirrelID | Hectare | Shift | Date | Hectare SquirrelNumber | Age | PrimaryFurColor | HighlightFurColor | CombinationofPrimaryandHighlightColor | Colornotes | Location | AboveGroundSighter Measurement | SpecificLocation | Running | Chasing | Climbing | Eating | Foraging | Other Activities | Kuks | Quaas | Moans | Tailflags | Tailtwitches | Approaches | Indifferent | Runsfrom | OtherInteractions | LatLng |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
-73.9561344937861 | 40.7940823884086 | 37F-PM-1014-03 | 37F | PM | 10142018 | 3 | + | false | false | false | false | false | false | false | false | false | false | false | false | false | POINT (-73.9561344937861 40.7940823884086) | |||||||||
-73.9688574691102 | 40.7837825208444 | 21B-AM-1019-04 | 21B | AM | 10192018 | 4 | + | false | false | false | false | false | false | false | false | false | false | false | false | false | POINT (-73.9688574691102 40.7837825208444) | |||||||||
-73.9742811484852 | 40.775533619083 | 11B-PM-1014-08 | 11B | PM | 10142018 | 8 | Gray | Gray+ | Above Ground | 10 | false | true | false | false | false | false | false | false | false | false | false | false | false | POINT (-73.97428114848522 40.775533619083) | ||||||
-73.9596413903948 | 40.7903128889029 | 32E-PM-1017-14 | 32E | PM | 10172018 | 14 | Adult | Gray | Gray+ | Nothing selected as Primary. Gray selected as Highlights. Made executive adjustments. | false | false | false | true | true | false | false | false | false | false | false | false | true | POINT (-73.9596413903948 40.7903128889029) | ||||||
-73.9702676472613 | 40.7762126854894 | 13E-AM-1017-05 | 13E | AM | 10172018 | 5 | Adult | Gray | Cinnamon | Gray+Cinnamon | Above Ground | on tree stump | false | false | false | false | true | false | false | false | false | false | false | false | false | POINT (-73.9702676472613 40.7762126854894) | ||||
-73.9683613516225 | 40.7725908847499 | 11H-AM-1010-03 | 11H | AM | 10102018 | 3 | Adult | Cinnamon | White | Cinnamon+White | false | false | false | false | true | false | false | false | false | true | false | true | false | POINT (-73.9683613516225 40.7725908847499) | ||||||
-73.9541201789795 | 40.7931811701082 | 36H-AM-1010-02 | 36H | AM | 10102018 | 2 | Adult | Gray | Gray+ | just outside hectare | Ground Plane | FALSE | false | false | false | false | true | false | false | false | false | false | false | false | false | POINT (-73.9541201789795 40.7931811701082) |
ポイントデータ対象物のスタイル設定
この例のコードでは、CombinationofPrimaryandHighlightColor
属性(各個体の 1 次体色と 2 次体色をまとめたデータ)をもとに各ポイントの塗りつぶし色とストローク色を決める単純なスタイル設定を行っています。
TypeScript
function setStyle(/* FeatureStyleFunctionOptions */ params) { // Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes['CombinationofPrimaryandHighlightColor']; // Apply styles. Fill is primary fur color, stroke is secondary fur color. switch (furColors) { case 'Black+': return /* FeatureStyleOptions */ { fillColor: 'black', pointRadius: 8 }; break; case 'Cinnamon+': return /* FeatureStyleOptions */ { fillColor: '#8b0000', pointRadius: 8 }; break; case 'Cinnamon+Gray': return /* FeatureStyleOptions */ { fillColor: '#8b0000', strokeColor: 'gray', pointRadius: 6 }; break; case 'Cinnamon+White': return /* FeatureStyleOptions */ { fillColor: '#8b0000', strokeColor: 'white', pointRadius: 6 }; break; case 'Gray+': return /* FeatureStyleOptions */ { fillColor: 'gray', pointRadius: 8 }; break; case 'Gray+Cinnamon': return /* FeatureStyleOptions */ { fillColor: 'gray', strokeColor: '#8b0000', pointRadius: 6 }; break; case 'Gray+Cinnamon, White': return /* FeatureStyleOptions */ { fillColor: 'silver', strokeColor: '#8b0000', pointRadius: 6 }; break; case 'Gray+White': return /* FeatureStyleOptions */ { fillColor: 'gray', strokeColor: 'white', pointRadius: 6 }; break; default: // Color not defined. return /* FeatureStyleOptions */ { fillColor: 'yellow', pointRadius: 8 }; break; } }
JavaScript
function setStyle(/* FeatureStyleFunctionOptions */ params) { // Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes["CombinationofPrimaryandHighlightColor"]; // Apply styles. Fill is primary fur color, stroke is secondary fur color. switch (furColors) { case "Black+": return /* FeatureStyleOptions */ { fillColor: "black", pointRadius: 8 }; break; case "Cinnamon+": return /* FeatureStyleOptions */ { fillColor: "#8b0000", pointRadius: 8 }; break; case "Cinnamon+Gray": return /* FeatureStyleOptions */ { fillColor: "#8b0000", strokeColor: "gray", pointRadius: 6, }; break; case "Cinnamon+White": return /* FeatureStyleOptions */ { fillColor: "#8b0000", strokeColor: "white", pointRadius: 6, }; break; case "Gray+": return /* FeatureStyleOptions */ { fillColor: "gray", pointRadius: 8 }; break; case "Gray+Cinnamon": return /* FeatureStyleOptions */ { fillColor: "gray", strokeColor: "#8b0000", pointRadius: 6, }; break; case "Gray+Cinnamon, White": return /* FeatureStyleOptions */ { fillColor: "silver", strokeColor: "#8b0000", pointRadius: 6, }; break; case "Gray+White": return /* FeatureStyleOptions */ { fillColor: "gray", strokeColor: "white", pointRadius: 6, }; break; default: // Color not defined. return /* FeatureStyleOptions */ { fillColor: "yellow", pointRadius: 8 }; break; } }
コードサンプルの全文
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TypeScript
let map; function setStyle(/* FeatureStyleFunctionOptions */ params) { // Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes['CombinationofPrimaryandHighlightColor']; // Apply styles. Fill is primary fur color, stroke is secondary fur color. switch (furColors) { case 'Black+': return /* FeatureStyleOptions */ { fillColor: 'black', pointRadius: 8 }; break; case 'Cinnamon+': return /* FeatureStyleOptions */ { fillColor: '#8b0000', pointRadius: 8 }; break; case 'Cinnamon+Gray': return /* FeatureStyleOptions */ { fillColor: '#8b0000', strokeColor: 'gray', pointRadius: 6 }; break; case 'Cinnamon+White': return /* FeatureStyleOptions */ { fillColor: '#8b0000', strokeColor: 'white', pointRadius: 6 }; break; case 'Gray+': return /* FeatureStyleOptions */ { fillColor: 'gray', pointRadius: 8 }; break; case 'Gray+Cinnamon': return /* FeatureStyleOptions */ { fillColor: 'gray', strokeColor: '#8b0000', pointRadius: 6 }; break; case 'Gray+Cinnamon, White': return /* FeatureStyleOptions */ { fillColor: 'silver', strokeColor: '#8b0000', pointRadius: 6 }; break; case 'Gray+White': return /* FeatureStyleOptions */ { fillColor: 'gray', strokeColor: 'white', pointRadius: 6 }; break; default: // Color not defined. return /* FeatureStyleOptions */ { fillColor: 'yellow', pointRadius: 8 }; break; } } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary('maps') as google.maps.MapsLibrary; const position = {lat: 40.780101, lng: -73.967780}; const map = new Map(document.getElementById('map') as HTMLElement, { zoom: 17, center: position, mapId: 'b98e588c46685dd7', mapTypeControl: false, streetViewControl: false, fullscreenControl: false, }); // Add the data legend. makeLegend(map); // Dataset ID for squirrel dataset. const datasetId = '02fa1552-37dd-4a95-844f-f99e1c22541f'; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); //@ts-ignore datasetLayer.style = setStyle; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement('div'); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.BOTTOM_LEFT].push(attributionDiv); } // Create a custom control to hold attribution text. function createAttribution(map) { const attributionLabel = document.createElement('div'); // Define CSS styles. attributionLabel.style.backgroundColor = '#fff'; attributionLabel.style.opacity = '0.7'; attributionLabel.style.fontFamily = 'Roboto,Arial,sans-serif'; attributionLabel.style.fontSize = '10px'; attributionLabel.style.padding = '2px'; attributionLabel.style.margin = '2px'; attributionLabel.textContent = 'Data source: NYC Open Data'; return attributionLabel; } function makeLegend(map) { let colors = { 'black': ['black'], 'cinnamon': ['#8b0000'], 'cinnamon + gray': ['#8b0000','gray'], 'cinnamon + white': ['#8b0000', 'white'], 'gray': ['gray'], 'gray + cinnamon': ['gray', '#8b0000'], 'gray + cinnamon + white': ['silver', '#8b0000'], 'gray + white': ['gray', 'white'], 'no color data': ['yellow'], }; let legend = document.createElement('div'); legend.id = 'legend'; let title = document.createElement('div'); title.innerText = 'Fur Colors'; title.classList.add('title'); legend.appendChild(title); let k; for (k in colors) { let wrapper = document.createElement('div'); wrapper.id = 'container'; let box = document.createElement('div'); box.style.backgroundColor = colors[k][0]; if (colors[k][1]) { box.style.borderColor = colors[k][1]; } else { box.style.borderColor = colors[k][0]; } box.classList.add('box'); let txt = document.createElement('div'); txt.classList.add('legend'); txt.innerText = k; wrapper.appendChild(box); wrapper.appendChild(txt); legend.appendChild(wrapper); } map.controls[google.maps.ControlPosition.LEFT_TOP].push(legend); } initMap();
JavaScript
let map; function setStyle(/* FeatureStyleFunctionOptions */ params) { // Get the dataset feature, so we can work with all of its attributes. const datasetFeature = params.feature; // Get all of the needed dataset attributes. const furColors = datasetFeature.datasetAttributes["CombinationofPrimaryandHighlightColor"]; // Apply styles. Fill is primary fur color, stroke is secondary fur color. switch (furColors) { case "Black+": return /* FeatureStyleOptions */ { fillColor: "black", pointRadius: 8 }; break; case "Cinnamon+": return /* FeatureStyleOptions */ { fillColor: "#8b0000", pointRadius: 8 }; break; case "Cinnamon+Gray": return /* FeatureStyleOptions */ { fillColor: "#8b0000", strokeColor: "gray", pointRadius: 6, }; break; case "Cinnamon+White": return /* FeatureStyleOptions */ { fillColor: "#8b0000", strokeColor: "white", pointRadius: 6, }; break; case "Gray+": return /* FeatureStyleOptions */ { fillColor: "gray", pointRadius: 8 }; break; case "Gray+Cinnamon": return /* FeatureStyleOptions */ { fillColor: "gray", strokeColor: "#8b0000", pointRadius: 6, }; break; case "Gray+Cinnamon, White": return /* FeatureStyleOptions */ { fillColor: "silver", strokeColor: "#8b0000", pointRadius: 6, }; break; case "Gray+White": return /* FeatureStyleOptions */ { fillColor: "gray", strokeColor: "white", pointRadius: 6, }; break; default: // Color not defined. return /* FeatureStyleOptions */ { fillColor: "yellow", pointRadius: 8 }; break; } } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps"); const position = { lat: 40.780101, lng: -73.96778 }; const map = new Map(document.getElementById("map"), { zoom: 17, center: position, mapId: "b98e588c46685dd7", mapTypeControl: false, streetViewControl: false, fullscreenControl: false, }); // Add the data legend. makeLegend(map); // Dataset ID for squirrel dataset. const datasetId = "02fa1552-37dd-4a95-844f-f99e1c22541f"; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); //@ts-ignore datasetLayer.style = setStyle; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement("div"); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.BOTTOM_LEFT].push(attributionDiv); } // Create a custom control to hold attribution text. function createAttribution(map) { const attributionLabel = document.createElement("div"); // Define CSS styles. attributionLabel.style.backgroundColor = "#fff"; attributionLabel.style.opacity = "0.7"; attributionLabel.style.fontFamily = "Roboto,Arial,sans-serif"; attributionLabel.style.fontSize = "10px"; attributionLabel.style.padding = "2px"; attributionLabel.style.margin = "2px"; attributionLabel.textContent = "Data source: NYC Open Data"; return attributionLabel; } function makeLegend(map) { let colors = { "black": ["black"], "cinnamon": ["#8b0000"], "cinnamon + gray": ["#8b0000", "gray"], "cinnamon + white": ["#8b0000", "white"], "gray": ["gray"], "gray + cinnamon": ["gray", "#8b0000"], "gray + cinnamon + white": ["silver", "#8b0000"], "gray + white": ["gray", "white"], "no color data": ["yellow"], }; let legend = document.createElement("div"); legend.id = "legend"; let title = document.createElement("div"); title.innerText = "Fur Colors"; title.classList.add("title"); legend.appendChild(title); let k; for (k in colors) { let wrapper = document.createElement("div"); wrapper.id = "container"; let box = document.createElement("div"); box.style.backgroundColor = colors[k][0]; if (colors[k][1]) { box.style.borderColor = colors[k][1]; } else { box.style.borderColor = colors[k][0]; } box.classList.add("box"); let txt = document.createElement("div"); txt.classList.add("legend"); txt.innerText = k; wrapper.appendChild(box); wrapper.appendChild(txt); legend.appendChild(wrapper); } map.controls[google.maps.ControlPosition.LEFT_TOP].push(legend); } initMap();
CSS
/* * 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; } #legend, #dataset, #counter { background-color: #e5e5e5; width: 15em; margin-top: 2em; margin-left: 1em; border-radius: 8px; font-family: Roboto; overflow: hidden; } #dataset select { border-radius: 0; padding: 0.1em; border: 1px solid black; width: auto; margin: 0.5em 1em; } .title { padding: 0.5em 1em; font-weight: bold; font-size: 1.5em; margin-bottom: 0.5em; background-color: rgb(66, 133, 244); color: white; width: 100%; } .button { font-size: 1.2em; margin: 1em; background-color: rgb(66, 133, 244); color: white; padding: 0.5em; border-radius: 8px; } #legend #container { margin: 0.5em 1em; display: flex; } #legend div .box { display: flex; width: 2em; height: 2em; border-radius: 50%; border: 3px solid; } #legend div .legend { display: flex; padding: 0.5em; }
HTML
<html> <head> <title>Style a point data feature</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <div id="map"></div> <!-- prettier-ignore --> <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))}) ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "beta"});</script> </body> </html>
サンプルを試す
ポリゴンデータのスタイル設定例
この例では、ポリゴン ジオメトリ ベースのデータ対象物をスタイル設定する際のアプローチを示します。
データセットについて
この例で使用しているのは、ニューヨーク市内の公園を示したデータセットです。次のコードは、データセットの GeoJSON ファイルから、代表的な対象物エントリを 1 つ抜粋したものです。
{ "type": "Feature", "properties": { "jurisdiction": "DPR", "mapped": "False", "zipcode": "11356", "acres": "0.05", "location": "College Pl., College Pt. Blvd., bet. 11 Ave. and 12 Ave.", "nys_assembly": "27", "councildistrict": "19", "url": "http://www.nycgovparks.org/parks/Q042/", "typecategory": "Triangle/Plaza", "us_congress": "14", "eapply": "Poppenhusen Park", "parentid": "Q-07", "gispropnum": "Q042", "retired": "false", "communityboard": "407", "objectid": "6248", "globalid": "F4810079-CBB9-4BE7-BBFA-B3C0C35D5DE5", "name311": "Poppenhusen Park", "department": "Q-07", "pip_ratable": "true", "subcategory": "Sitting Area/Triangle/Mall", "precinct": "109", "permit": "true", "acquisitiondate": null, "omppropid": "Q042", "gisobjid": "100000301", "signname": "Poppenhusen Park", "address": null, "permitparent": "Q-07", "class": "PARK", "nys_senate": "11", "permitdistrict": "Q-07", "borough": "Q", "waterfront": "false" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ -73.84575702371716, 40.78796240884273 ], [ -73.84593393292693, 40.78796857347548 ], [ -73.84577256469657, 40.787651355629556 ], [ -73.84575702371716, 40.78796240884273 ] ] ] ] } },
ポリゴンデータ対象物のスタイル設定
この例のコードでは、typecategory
属性「Undeveloped」または「Parkway」と関連付けられたデータ対象物には特殊な配色を適用し、それ以外の対象物はすべて緑色にしています。
TypeScript
function setStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // 'typecategory' is an attribute in this Dataset. const typeCategory = datasetFeature.datasetAttributes['typecategory']; switch (typeCategory) { case 'Undeveloped': // Color undeveloped areas blue. return /* FeatureStyleOptions */ { strokeColor: 'blue', strokeWeight: 2, strokeOpacity: 1, fillColor: 'blue', fillOpacity: 0.3, }; break; case 'Parkway': // Color historical house sites red. return /* FeatureStyleOptions */ { strokeColor: 'red', strokeWeight: 2, strokeOpacity: 1, fillColor: 'red', fillOpacity: 0.5, }; break; default: // Color other type categories green. return /* FeatureStyleOptions */ { strokeColor: 'green', strokeWeight: 2, strokeOpacity: 1, fillColor: 'green', fillOpacity: 0.3, }; break; } }
JavaScript
function setStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // 'typecategory' is an attribute in this Dataset. const typeCategory = datasetFeature.datasetAttributes["typecategory"]; switch (typeCategory) { case "Undeveloped": // Color undeveloped areas blue. return /* FeatureStyleOptions */ { strokeColor: "blue", strokeWeight: 2, strokeOpacity: 1, fillColor: "blue", fillOpacity: 0.3, }; break; case "Parkway": // Color historical house sites red. return /* FeatureStyleOptions */ { strokeColor: "red", strokeWeight: 2, strokeOpacity: 1, fillColor: "red", fillOpacity: 0.5, }; break; default: // Color other type categories green. return /* FeatureStyleOptions */ { strokeColor: "green", strokeWeight: 2, strokeOpacity: 1, fillColor: "green", fillOpacity: 0.3, }; break; } }
コードサンプルの全文
サンプル ソースコードの全文を見る
TypeScript
let map; function setStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // 'typecategory' is an attribute in this Dataset. const typeCategory = datasetFeature.datasetAttributes['typecategory']; switch (typeCategory) { case 'Undeveloped': // Color undeveloped areas blue. return /* FeatureStyleOptions */ { strokeColor: 'blue', strokeWeight: 2, strokeOpacity: 1, fillColor: 'blue', fillOpacity: 0.3, }; break; case 'Parkway': // Color historical house sites red. return /* FeatureStyleOptions */ { strokeColor: 'red', strokeWeight: 2, strokeOpacity: 1, fillColor: 'red', fillOpacity: 0.5, }; break; default: // Color other type categories green. return /* FeatureStyleOptions */ { strokeColor: 'green', strokeWeight: 2, strokeOpacity: 1, fillColor: 'green', fillOpacity: 0.3, }; break; } } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary; const position = {lat: 40.580732, lng: -74.152826}; const map = new Map(document.getElementById('map') as HTMLElement, { zoom: 14, center: position, mapId: 'b98e588c46685dd7', mapTypeControl: false, }); // Dataset ID for NYC park data. const datasetId = '6fe13aa9-b900-45e7-b636-3236672c3f4f'; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = setStyle; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement('div'); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } function createAttribution(map) { const attributionLabel = document.createElement('div'); // Define CSS styles. attributionLabel.style.backgroundColor = '#fff'; attributionLabel.style.opacity = '0.7'; attributionLabel.style.fontFamily = 'Roboto,Arial,sans-serif'; attributionLabel.style.fontSize = '10px'; attributionLabel.style.padding = '2px'; attributionLabel.style.margin = '2px'; attributionLabel.textContent = 'Data source: NYC Open Data'; return attributionLabel; } initMap();
JavaScript
let map; function setStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // 'typecategory' is an attribute in this Dataset. const typeCategory = datasetFeature.datasetAttributes["typecategory"]; switch (typeCategory) { case "Undeveloped": // Color undeveloped areas blue. return /* FeatureStyleOptions */ { strokeColor: "blue", strokeWeight: 2, strokeOpacity: 1, fillColor: "blue", fillOpacity: 0.3, }; break; case "Parkway": // Color historical house sites red. return /* FeatureStyleOptions */ { strokeColor: "red", strokeWeight: 2, strokeOpacity: 1, fillColor: "red", fillOpacity: 0.5, }; break; default: // Color other type categories green. return /* FeatureStyleOptions */ { strokeColor: "green", strokeWeight: 2, strokeOpacity: 1, fillColor: "green", fillOpacity: 0.3, }; break; } } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps"); const position = { lat: 40.580732, lng: -74.152826 }; const map = new Map(document.getElementById("map"), { zoom: 14, center: position, mapId: "b98e588c46685dd7", mapTypeControl: false, }); // Dataset ID for NYC park data. const datasetId = "6fe13aa9-b900-45e7-b636-3236672c3f4f"; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = setStyle; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement("div"); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } function createAttribution(map) { const attributionLabel = document.createElement("div"); // Define CSS styles. attributionLabel.style.backgroundColor = "#fff"; attributionLabel.style.opacity = "0.7"; attributionLabel.style.fontFamily = "Roboto,Arial,sans-serif"; attributionLabel.style.fontSize = "10px"; attributionLabel.style.padding = "2px"; attributionLabel.style.margin = "2px"; attributionLabel.textContent = "Data source: NYC Open Data"; return attributionLabel; } initMap();
CSS
/* * 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; }
HTML
<html> <head> <title>Style a polygon data feature with more detail</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <div id="map"></div> <!-- prettier-ignore --> <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))}) ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "beta"});</script> </body> </html>
サンプルを試す
ポリライン データのスタイル設定例
この例では、ポリライン ジオメトリ ベースのデータ対象物をスタイル設定する際のアプローチを示します。
データセットについて
この例で使用しているのは、シアトル近郊の橋を表示するデータセットです。 次のコードは、データセットの GeoJSON ファイルから、代表的な対象物エントリを 1 つ抜粋したものです。
{ "type": "Feature", "properties": { "OBJECTID": 1, "COMPTYPE": 66, "COMPKEY": 515774, "HANSEGKEY": 489781, "UNITID": "BRG-935", "UNITTYPE": " ", "BRGUNITID": "BRG-935", "UNITDESC_BRG": "YALE AVE BR REV LANE OC ", "UNITDESC_SEG": "HOWELL ST ON RP BETWEEN HOWELL ST AND I5 SB ", "INSTDATE": null, "EXPDATE": null, "STATUS": " ", "STATUSDT": null, "CONDITION": " ", "CONDDT": null, "OWN": " ", "LSTVERIFY": null, "MAINTBY": " ", "ADDBY": "GARCIAA", "ADDDTTM": "2010-01-21T00:00:00Z", "MODBY": null, "MODDTTM": null, "BR_NBR": 935, "BR_CODE": " 935", "BR_TYPE": "ST", "BR_NAME": "YALE AVE BR REV LANE OC", "BR_FACILITIES": "YALE AVE-SR 5 ON RAMP", "BR_FEATURES": "SR 5 REV LANE", "BR_RATING": 0, "BR_INSET": 1, "BR_GEO": "DT", "BR_OWNER": "DOT", "BR_OWNER_NAME": "State of Washington", "GEOBASID": 0, "XGEOBASID": 0, "GISSEGKEY": 489781, "EARTHQUAKE_RESPONSE_TEAM": " ", "SHAPE_Length": 220.11891836147655 }, "geometry": { "type": "LineString", "coordinates": [ [ -122.329201929090928, 47.616910448708538 ], [ -122.329206483407461, 47.616976719821004 ], [ -122.32921802149356, 47.617042137515213 ], [ -122.329236413912909, 47.617105967923777 ], [ -122.329261454336034, 47.617167494985758 ], [ -122.329292861855023, 47.617226028479571 ], [ -122.329330284134699, 47.617280911766009 ], [ -122.329373301365223, 47.617331529154569 ], [ -122.329421430971635, 47.617377312810319 ], [ -122.329474133027375, 47.617417749124023 ], [ -122.32953081631139, 47.617452384473893 ] ] } },
ポリライン データ対象物のスタイル設定
次のコードでは、同じスタイルをすべてのデータ対象物に直接適用しています。ロジックが不要なため、ここでは対象物スタイル関数は使用していません。
TypeScript
// Apply style to all features. datasetLayer.style = { strokeColor: 'green', strokeWeight: 4, };
JavaScript
// Apply style to all features. datasetLayer.style = { strokeColor: "green", strokeWeight: 4 };
サンプル ソースコードの全文を見る
TypeScript
let map; async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary; const position = {lat: 47.59, lng: -122.31}; const map = new Map(document.getElementById('map') as HTMLElement, { zoom: 14, center: position, mapId: 'b98e588c46685dd7', mapTypeControl: false, }); // Dataset ID for Seattle Bridges const datasetId = '3d0bd5fb-3f42-47fe-b50f-81c0932cd533'; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); // Apply style to all features. datasetLayer.style = { strokeColor: 'green', strokeWeight: 4, }; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement('div'); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } // Create a custom control to hold attribution text. function createAttribution(map) { const attributionLabel = document.createElement('div'); // Define CSS styles. attributionLabel.style.backgroundColor = '#fff'; attributionLabel.style.opacity = '0.7'; attributionLabel.style.fontFamily = 'Roboto,Arial,sans-serif'; attributionLabel.style.fontSize = '10px'; attributionLabel.style.padding = '2px'; attributionLabel.style.margin = '2px'; attributionLabel.textContent = 'Data source: Seattle GeoData'; return attributionLabel; } initMap();
JavaScript
let map; async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps"); const position = { lat: 47.59, lng: -122.31 }; const map = new Map(document.getElementById("map"), { zoom: 14, center: position, mapId: "b98e588c46685dd7", mapTypeControl: false, }); // Dataset ID for Seattle Bridges const datasetId = "3d0bd5fb-3f42-47fe-b50f-81c0932cd533"; //@ts-ignore const datasetLayer = map.getDatasetFeatureLayer(datasetId); // Apply style to all features. datasetLayer.style = { strokeColor: "green", strokeWeight: 4 }; // Create an attribution DIV and add the attribution to the map. const attributionDiv = document.createElement("div"); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } // Create a custom control to hold attribution text. function createAttribution(map) { const attributionLabel = document.createElement("div"); // Define CSS styles. attributionLabel.style.backgroundColor = "#fff"; attributionLabel.style.opacity = "0.7"; attributionLabel.style.fontFamily = "Roboto,Arial,sans-serif"; attributionLabel.style.fontSize = "10px"; attributionLabel.style.padding = "2px"; attributionLabel.style.margin = "2px"; attributionLabel.textContent = "Data source: Seattle GeoData"; return attributionLabel; } initMap();
CSS
/* * 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; }
HTML
<html> <head> <title>Style a polyline data feature</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <div id="map"></div> <!-- prettier-ignore --> <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))}) ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "beta"});</script> </body> </html>