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index.js
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index.js
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/**
* @license
* Copyright 2019 Google LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
// [START maps_dds_datasets_polygon_colors]
let map;
// [START maps_dds_datasets_polygon_colors_style_function]
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;
}
}
// [END maps_dds_datasets_polygon_colors_style_function]
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();
// [END maps_dds_datasets_polygon_colors]