Add a generated icon to the map
This example uses addImage
to generate an icon at runtime and add it to a map style. Then it adds the icon to the map by including the 'layout': {'icon-image': 'gradient'}
statement inside addLayer
.
<!DOCTYPE html><html><head><meta charset="utf-8"><title>Add a generated icon to the map</title><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"><link href="https://api.mapbox.com/mapbox-gl-js/v3.0.1/mapbox-gl.css" rel="stylesheet"><script src="https://api.mapbox.com/mapbox-gl-js/v3.0.1/mapbox-gl.js"></script><style>body { margin: 0; padding: 0; }#map { position: absolute; top: 0; bottom: 0; width: 100%; }</style></head><body><div id="map"></div> <script> // TO MAKE THE MAP APPEAR YOU MUST // ADD YOUR ACCESS TOKEN FROM // https://account.mapbox.com mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';const map = new mapboxgl.Map({container: 'map',center: [0, 0],zoom: 2,// Choose from Mapbox's core styles, or make your own style with Mapbox Studiostyle: 'mapbox://styles/mapbox/streets-v12'}); map.on('load', () => {const width = 64; // The image will be 64 pixels squareconst bytesPerPixel = 4; // Each pixel is represented by 4 bytes: red, green, blue, and alpha.const data = new Uint8Array(width * width * bytesPerPixel); for (let x = 0; x < width; x++) {for (let y = 0; y < width; y++) {const offset = (y * width + x) * bytesPerPixel;data[offset + 0] = (y / width) * 255; // reddata[offset + 1] = (x / width) * 255; // greendata[offset + 2] = 128; // bluedata[offset + 3] = 255; // alpha}} map.addImage('gradient', { width: width, height: width, data: data }); map.addSource('point', {'type': 'geojson','data': {'type': 'FeatureCollection','features': [{'type': 'Feature','geometry': {'type': 'Point','coordinates': [0, 0]}}]}});map.addLayer({'id': 'points','type': 'symbol','source': 'point','layout': {'icon-image': 'gradient'}});});</script> </body></html>
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