我想创建一个标记,正如我们在 Carto SalesQuest 产品中看到的那样。
在 CARTO 提供的这篇文章之后,我从我的 CARTOjs 4 制作了一个集群图
https://carto.com/blog/inside/tile-aggregation/
我可以使用 CARTOCSS 来设置我的图层样式,但我想知道实现这样一个示例的最佳实践/方法是什么:见下文
多值圆环图,如 CARTO Salesquest 中所示的集群标记
我的代码看起来像这样(隐藏的 API KEY)
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0" />
<meta charset="utf-8" />
<!-- Include Carto.js -->
<script src="https://cartodb-libs.global.ssl.fastly.net/carto.js/v4.0.2/carto.min.js"></script>
<!-- Include Leaflet -->
<script src="https://unpkg.com/leaflet@1.2.0/dist/leaflet.js"></script>
<link href="https://unpkg.com/leaflet@1.2.0/dist/leaflet.css" rel="stylesheet" />
<style>
body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
const map = L.map('map').setView([30, 0], 3);
L.tileLayer('http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png', {
maxZoom: 18
}).addTo(map);
// define client
const client = new carto.Client({
apiKey: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX',
username: 'anagraph-clement'
});
// define source of data using a SQL query
const source = new carto.source.SQL(`
select *, 1 as count from pochesfils_carto
`);
// Aggregation option
const aggregation = new carto.layer.Aggregation({
threshold: 5,
resolution: 32,
placement: carto.layer.Aggregation.placement.SAMPLE,
columns: {
total_agg: {
aggregateFunction: carto.layer.Aggregation.operation.SUM,
aggregatedColumn: "count"
}
}
});
// define CartoCSS code to style data on map
const style = new carto.style.CartoCSS(`
#layer {
marker-fill: ramp([total_agg], (#3288bd, #99d594, #e6f598, #ffffbf, #fee08b, #fc8d59, #d53e4f), quantiles);
marker-width: ramp([total_agg], 8 ,40 , quantiles);
marker-line-color: ramp([total_agg], (#5F4690, #1D6996, #38A6A5, #0F8554, #73AF48, #EDAD08, #E17C05, #CC503E, #94346E, #6F4070, #666666), (5,10,20,30,50,66,75,100,150), "=", category);
marker-line-width: 5;
marker-line-opacity: 0.75;
}
#layer::labels {
text-name: [total_agg];
text-face-name: 'DejaVu Sans Book';
text-size: 8;
text-fill: #FFFFFF;
text-label-position-tolerance: 0;
text-halo-radius: 1;
text-halo-fill: black;
text-allow-overlap: true;
text-placement: point;
text-placement-type: dummy;
}
`);
// create CARTO layer from source and style variables
// and defining the interactivity of columns
// when featureOver and featureClick events are executed
const cartolayer = new carto.layer.Layer(source, style, { aggregation });
// add CARTO layer to the client
client.addLayer(cartolayer);
// get tile from client and add them to the map object
client.getLeafletLayer().addTo(map);
</script>
</body>
</html>
感谢您让我知道您是否对这种类型的标记创建有任何提示。(svg ? d3.js ? chart.js ? CARTOCSS + TurboCARTO ? 等等...)