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zhongjin
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<!DOCTYPE html>
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<html>
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<head>
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<title>CARTO.js + Category Dataviews + Vega Pie Chart</title>
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<meta name="viewport" content="initial-scale=1.0">
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<meta charset="utf-8">
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<link href="https://fonts.googleapis.com/css?family=Montserrat:400,600,700|Open+Sans:300,400,600" rel="stylesheet">
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<!-- Include Leaflet -->
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<script src="https://unpkg.com/leaflet/dist/leaflet.js"></script>
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<link href="https://unpkg.com/leaflet/dist/leaflet.css" rel="stylesheet">
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<!-- Include CARTO.js -->
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<script src="https://libs.cartocdn.com/carto.js/v4.1.11/carto.min.js"></script>
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<link href="https://fonts.googleapis.com/css?family=Montserrat:600" rel="stylesheet">
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<link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">
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<!-- Custom Style -->
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<link href="https://carto.com/developers/carto-js/examples/maps/public/style.css" rel="stylesheet">
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<!-- Vega -->
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<script src="https://cdn.jsdelivr.net/npm/vega@3"></script>
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<script src="https://cdn.jsdelivr.net/npm/vega-lite@2"></script>
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<script src="https://cdn.jsdelivr.net/npm/vega-embed@3"></script>
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</head>
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<body>
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<div id="map"></div>
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<aside class="toolbox">
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<div class="box">
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<header>
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<h1>Pie Chart Example</h1>
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</header>
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<section>
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<p class="description open-sans">Done with Vega Lite</p>
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<br>
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<div id="piechart"></div>
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<div style="margin-top: 12px;" id="legend"></div>
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</section>
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</div>
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</aside>
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<script>
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const map = L.map('map').setView([30, 0], 3);
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map.scrollWheelZoom.disable();
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L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', {
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maxZoom: 18
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}).addTo(map);
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const client = new carto.Client({
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apiKey: 'default_public',
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username: 'cartojs-test'
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});
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const source = new carto.source.SQL('SELECT * FROM ne_10m_populated_places_simple');
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const style = new carto.style.CartoCSS(`
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#layer {
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marker-width: 7;
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marker-fill: ramp([adm0name], cartocolor(Vivid), category(10));
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marker-line-color: #FFFFFF;
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}
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`);
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const layer = new carto.layer.Layer(source, style);
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client.addLayer(layer);
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client.getLeafletLayer().addTo(map);
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const categoryDataview = new carto.dataview.Category(source, 'adm0name', {
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limit: 12,
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operation: carto.operation.COUNT
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});
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categoryDataview.on('dataChanged', data => {
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const categories = data.categories;
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drawPieChart(categories, '#piechart');
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});
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categoryDataview.on('error', error => {
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alert(error.message);
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});
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client.addDataview(categoryDataview);
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const bboxFilter = new carto.filter.BoundingBoxLeaflet(map);
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categoryDataview.addFilter(bboxFilter);
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const legend = document.getElementById("legend");
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function renderCategoryLegend(metadata){
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metadata.styles.forEach(function (styleMetadata) {
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if (styleMetadata.getProperty() == 'marker-fill') {
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let metaCategories = styleMetadata.getCategories();
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for (category of metaCategories){
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const li = document.createElement('li');
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li.style.color = `${category.value}`
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li.innerHTML = `<span style="color: black;">${category.name}</span>`;
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legend.append(li);
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}
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}
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});
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}
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layer.on('metadataChanged', renderCategoryLegend);
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function drawPieChart(cats, id) {
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const vegaSpecPie = {
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"$schema": "https://vega.github.io/schema/vega/v3.3.1.json",
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"width": 200,
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"height": 200,
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"autosize": "none",
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"signals": [{
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"name": "startAngle",
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"value": 0
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},
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{
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"name": "endAngle",
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"value": 6.29
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},
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{
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"name": "padAngle",
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"value": 0.05
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},
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{
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"name": "innerRadius",
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"value": 40
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},
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{
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"name": "sort",
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"value": false
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},
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],
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"data": [{
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"name": "categories",
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"values": cats,
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"transform": [{
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"type": "pie",
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"field": "value",
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"startAngle": {
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"signal": "startAngle"
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},
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"endAngle": {
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"signal": "endAngle"
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},
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"sort": {
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"signal": "sort"
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}
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}]
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}],
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"scales": [{
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"name": "vivid",
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"type": "ordinal",
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"domain": {
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"data": "categories",
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"field": "name"
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},
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"range": ['#E58606','#5D69B1','#52BCA3','#99C945','#CC61B0','#24796C','#DAA51B','#2F8AC4','#764E9F','#ED645A','#CC3A8E','#A5AA99']
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}],
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"marks": [{
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"type": "arc",
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"from": {
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"data": "categories"
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},
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"encode": {
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"enter": {
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"fill": {
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"scale": "vivid",
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"field": "name"
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},
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"x": {
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"signal": "width / 2"
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},
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"y": {
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"signal": "height / 2"
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}
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},
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"update": {
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"startAngle": {
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"field": "startAngle"
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},
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"endAngle": {
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"field": "endAngle"
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},
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"padAngle": {
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"signal": "padAngle"
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},
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"innerRadius": {
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"signal": "innerRadius"
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},
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"outerRadius": {
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"signal": "width / 2"
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},
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"fillOpacity": {
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"value": 1
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}
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},
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"hover": {
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"fillOpacity": {
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"value": 0.8
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}
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}
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}
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}]
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};
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vegaEmbed(id, vegaSpecPie, {
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actions: false
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});
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}
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</script>
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</body>
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</html>
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