מפה כורופתית היא סוג של מפה נושאית, שבה אזורים מנהליים צבועים או מוצללים בהתאם לערך של נתונים. אפשר להשתמש ב-google.maps.FeatureStyleFunction כדי לעצב מפה לפי מערך נתונים שבו כל אזור ניהולי משויך לטווח של ערכים מספריים. המפה לדוגמה הבאה מציגה מפה כורופתית שמתארת נתונים על אוכלוסיית המדינה בארצות הברית.
בדוגמה הזו, הנתונים מורכבים ממערך של צמדי מפתח/ערך, שתואמים לשם המוצג של כל מצב עם ערך אוכלוסייה מספרי. השדה maps.FeatureStyleFunction צובע באופן מותנה כל אזור לפי הערכים במערך.
TypeScript
featureLayer.style = featureStyleFunctionOptions => {
const placeFeature = featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
const population = states[placeFeature.placeId];
let fillColor;
// Specify colors using any of the following:
// * Named ('green')
// * Hexadecimal ('#FF0000')
// * RGB ('rgb(0, 0, 255)')
// * HSL ('hsl(60, 100%, 50%)')
if (population < 2000000) {
fillColor = 'green'
} else if (population < 5000000) {
fillColor = 'red'
} else if (population < 10000000) {
fillColor = 'blue'
} else if (population < 40000000) {
fillColor = 'yellow'
}
return {
fillColor,
fillOpacity: 0.5
}
}
JavaScript
featureLayer.style = (featureStyleFunctionOptions) => {
const placeFeature = featureStyleFunctionOptions.feature;
const population = states[placeFeature.placeId];
let fillColor;
// Specify colors using any of the following:
// * Named ('green')
// * Hexadecimal ('#FF0000')
// * RGB ('rgb(0, 0, 255)')
// * HSL ('hsl(60, 100%, 50%)')
if (population < 2000000) {
fillColor = "green";
} else if (population < 5000000) {
fillColor = "red";
} else if (population < 10000000) {
fillColor = "blue";
} else if (population < 40000000) {
fillColor = "yellow";
}
return {
fillColor,
fillOpacity: 0.5,
};
};
השלמת קוד לדוגמה
TypeScript
async function initMap() {
// Request needed libraries.
const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
const map = new Map(document.getElementById('map') as HTMLElement, {
center: { lat: 40.76, lng: -101.64 },
zoom: 5,
// In the cloud console, configure this Map ID with a style that enables the
// "Administrative Area Level 1" feature layer.
mapId: '7ba16be0c9375fa7',
});
const featureLayer = map.getFeatureLayer(google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1);
featureLayer.style = featureStyleFunctionOptions => {
const placeFeature = featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
const population = states[placeFeature.placeId];
let fillColor;
// Specify colors using any of the following:
// * Named ('green')
// * Hexadecimal ('#FF0000')
// * RGB ('rgb(0, 0, 255)')
// * HSL ('hsl(60, 100%, 50%)')
if (population < 2000000) {
fillColor = 'green'
} else if (population < 5000000) {
fillColor = 'red'
} else if (population < 10000000) {
fillColor = 'blue'
} else if (population < 40000000) {
fillColor = 'yellow'
}
return {
fillColor,
fillOpacity: 0.5
}
}
// Population data by state.
const states = {
"ChIJdf5LHzR_hogR6czIUzU0VV4": 5039877, // Alabama
"ChIJG8CuwJzfAFQRNduKqSde27w": 732673, // Alaska
"ChIJaxhMy-sIK4cRcc3Bf7EnOUI": 7276316, // Arizona
"ChIJYSc_dD-e0ocR0NLf_z5pBaQ": 3025891, // Arkansas
"ChIJPV4oX_65j4ARVW8IJ6IJUYs": 39237836, // California
"ChIJt1YYm3QUQIcR_6eQSTGDVMc": 5812069, // Colorado
"ChIJpVER8hFT5okR5XBhBVttmq4": 3605597, // Connecticut
"ChIJO9YMTXYFx4kReOgEjBItHZQ": 1003384, // Delaware
"ChIJvypWkWV2wYgR0E7HW9MTLvc": 21781128, // Florida
"ChIJV4FfHcU28YgR5xBP7BC8hGY": 10799566, // Georgia
"ChIJBeB5Twbb_3sRKIbMdNKCd0s": 1441553, // Hawaii
"ChIJ6Znkhaj_WFMRWIf3FQUwa9A": 1900923, // Idaho
"ChIJGSZubzgtC4gRVlkRZFCCFX8": 12671469, // Illinois
"ChIJHRv42bxQa4gRcuwyy84vEH4": 6805985, // Indiana
"ChIJGWD48W9e7ocR2VnHV0pj78Y": 3193079, // Iowa
"ChIJawF8cXEXo4cRXwk-S6m0wmg": 2934582, // Kansas
"ChIJyVMZi0xzQogR_N_MxU5vH3c": 4509394, // Kentucky
"ChIJZYIRslSkIIYRA0flgTL3Vck": 4624047, // Louisiana
"ChIJ1YpTHd4dsEwR0KggZ2_MedY": 1372247, // Maine
"ChIJ35Dx6etNtokRsfZVdmU3r_I": 6165129, // Maryland
"ChIJ_b9z6W1l44kRHA2DVTbQxkU": 6984723, // Massachussetts
"ChIJEQTKxz2qTE0Rs8liellI3Zc": 10050811, // Michigan
"ChIJmwt4YJpbWE0RD6L-EJvJogI": 5707390, // Minnesota
"ChIJGdRK5OQyKIYR2qbc6X8XDWI": 2949965, // Mississippi
"ChIJfeMiSNXmwIcRcr1mBFnEW7U": 6168187, // Misssouri
"ChIJ04p7LZwrQVMRGGwqz1jWcfU": 1104271, // Montana
"ChIJ7fwMtciNk4cRxArzDwyQJ6E": 1963692, // Nebraska
"ChIJcbTe-KEKmYARs5X8qooDR88": 3143991, // Nevada
"ChIJ66bAnUtEs0wR64CmJa8CyNc": 1388992, // New Hampshire
"ChIJn0AAnpX7wIkRjW0_-Ad70iw": 9267130, // New Jersey
"ChIJqVKY50NQGIcRup41Yxpuv0Y": 2115877, // New Mexico
"ChIJqaUj8fBLzEwRZ5UY3sHGz90": 19835913, // New York
"ChIJgRo4_MQfVIgRGa4i6fUwP60": 10551162, // North Carolina
"ChIJY-nYVxKD11IRyc9egzmahA0": 774948, // North Dakota
"ChIJwY5NtXrpNogRFtmfnDlkzeU": 11780017, // Ohio
"ChIJnU-ssRE5rIcRSOoKQDPPHF0": 3986639, // Oklahoma
"ChIJVWqfm3xuk1QRdrgLettlTH0": 4246155, // Oregon
"ChIJieUyHiaALYgRPbQiUEchRsI": 12964056, // Pennsylvania
"ChIJD9cOYhQ15IkR5wbB57wYTh4": 1095610, // Rhode Island
"ChIJ49ExeWml-IgRnhcF9TKh_7k": 5190705, // South Carolina
"ChIJpTjphS1DfYcRt6SGMSnW8Ac": 895376, // South Dakota
"ChIJA8-XniNLYYgRVpGBpcEgPgM": 6975218, // Tennessee
"ChIJSTKCCzZwQIYRPN4IGI8c6xY": 29527941, // Texas
"ChIJzfkTj8drTIcRP0bXbKVK370": 3337975, // Utah
"ChIJ_87aSGzctEwRtGtUNnSJTSY": 645570, // Vermont
"ChIJzbK8vXDWTIgRlaZGt0lBTsA": 8642274, // Virginia
"ChIJ-bDD5__lhVQRuvNfbGh4QpQ": 7738692, // Washington
"ChIJRQnL1KVUSogRQzrN3mjHALs": 1782959, // West Virginia
"ChIJr-OEkw_0qFIR1kmG-LjV1fI": 5895908, // Wisconsin
"ChIJaS7hSDTiXocRLzh90nkisCY": 578803, // Wyoming
};
}
initMap();
JavaScript
async function initMap() {
// Request needed libraries.
const { Map } = await google.maps.importLibrary("maps");
const map = new Map(document.getElementById("map"), {
center: { lat: 40.76, lng: -101.64 },
zoom: 5,
// In the cloud console, configure this Map ID with a style that enables the
// "Administrative Area Level 1" feature layer.
mapId: "7ba16be0c9375fa7",
});
const featureLayer = map.getFeatureLayer(
google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1,
);
featureLayer.style = (featureStyleFunctionOptions) => {
const placeFeature = featureStyleFunctionOptions.feature;
const population = states[placeFeature.placeId];
let fillColor;
// Specify colors using any of the following:
// * Named ('green')
// * Hexadecimal ('#FF0000')
// * RGB ('rgb(0, 0, 255)')
// * HSL ('hsl(60, 100%, 50%)')
if (population < 2000000) {
fillColor = "green";
} else if (population < 5000000) {
fillColor = "red";
} else if (population < 10000000) {
fillColor = "blue";
} else if (population < 40000000) {
fillColor = "yellow";
}
return {
fillColor,
fillOpacity: 0.5,
};
};
// Population data by state.
const states = {
"ChIJdf5LHzR_hogR6czIUzU0VV4": 5039877,
"ChIJG8CuwJzfAFQRNduKqSde27w": 732673,
"ChIJaxhMy-sIK4cRcc3Bf7EnOUI": 7276316,
"ChIJYSc_dD-e0ocR0NLf_z5pBaQ": 3025891,
"ChIJPV4oX_65j4ARVW8IJ6IJUYs": 39237836,
"ChIJt1YYm3QUQIcR_6eQSTGDVMc": 5812069,
"ChIJpVER8hFT5okR5XBhBVttmq4": 3605597,
"ChIJO9YMTXYFx4kReOgEjBItHZQ": 1003384,
"ChIJvypWkWV2wYgR0E7HW9MTLvc": 21781128,
"ChIJV4FfHcU28YgR5xBP7BC8hGY": 10799566,
"ChIJBeB5Twbb_3sRKIbMdNKCd0s": 1441553,
"ChIJ6Znkhaj_WFMRWIf3FQUwa9A": 1900923,
"ChIJGSZubzgtC4gRVlkRZFCCFX8": 12671469,
"ChIJHRv42bxQa4gRcuwyy84vEH4": 6805985,
"ChIJGWD48W9e7ocR2VnHV0pj78Y": 3193079,
"ChIJawF8cXEXo4cRXwk-S6m0wmg": 2934582,
"ChIJyVMZi0xzQogR_N_MxU5vH3c": 4509394,
"ChIJZYIRslSkIIYRA0flgTL3Vck": 4624047,
"ChIJ1YpTHd4dsEwR0KggZ2_MedY": 1372247,
"ChIJ35Dx6etNtokRsfZVdmU3r_I": 6165129,
"ChIJ_b9z6W1l44kRHA2DVTbQxkU": 6984723,
"ChIJEQTKxz2qTE0Rs8liellI3Zc": 10050811,
"ChIJmwt4YJpbWE0RD6L-EJvJogI": 5707390,
"ChIJGdRK5OQyKIYR2qbc6X8XDWI": 2949965,
"ChIJfeMiSNXmwIcRcr1mBFnEW7U": 6168187,
"ChIJ04p7LZwrQVMRGGwqz1jWcfU": 1104271,
"ChIJ7fwMtciNk4cRxArzDwyQJ6E": 1963692,
"ChIJcbTe-KEKmYARs5X8qooDR88": 3143991,
"ChIJ66bAnUtEs0wR64CmJa8CyNc": 1388992,
"ChIJn0AAnpX7wIkRjW0_-Ad70iw": 9267130,
"ChIJqVKY50NQGIcRup41Yxpuv0Y": 2115877,
"ChIJqaUj8fBLzEwRZ5UY3sHGz90": 19835913,
"ChIJgRo4_MQfVIgRGa4i6fUwP60": 10551162,
"ChIJY-nYVxKD11IRyc9egzmahA0": 774948,
"ChIJwY5NtXrpNogRFtmfnDlkzeU": 11780017,
"ChIJnU-ssRE5rIcRSOoKQDPPHF0": 3986639,
"ChIJVWqfm3xuk1QRdrgLettlTH0": 4246155,
"ChIJieUyHiaALYgRPbQiUEchRsI": 12964056,
"ChIJD9cOYhQ15IkR5wbB57wYTh4": 1095610,
"ChIJ49ExeWml-IgRnhcF9TKh_7k": 5190705,
"ChIJpTjphS1DfYcRt6SGMSnW8Ac": 895376,
"ChIJA8-XniNLYYgRVpGBpcEgPgM": 6975218,
"ChIJSTKCCzZwQIYRPN4IGI8c6xY": 29527941,
"ChIJzfkTj8drTIcRP0bXbKVK370": 3337975,
"ChIJ_87aSGzctEwRtGtUNnSJTSY": 645570,
"ChIJzbK8vXDWTIgRlaZGt0lBTsA": 8642274,
"ChIJ-bDD5__lhVQRuvNfbGh4QpQ": 7738692,
"ChIJRQnL1KVUSogRQzrN3mjHALs": 1782959,
"ChIJr-OEkw_0qFIR1kmG-LjV1fI": 5895908,
"ChIJaS7hSDTiXocRLzh90nkisCY": 578803, // Wyoming
};
}
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>Choropleth Map</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<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: "weekly"});</script>
</body>
</html>