バウンディングボックス内のフィーチャを強調表示
Shift キーを押したまま、マップをドラッグし、queryRenderedFeatureからフィーチャーを問い合わせます。
<!DOCTYPE html><html><head><meta charset="utf-8"><title>バウンディングボックス内のフィーチャを強調表示</title><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"><link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet"><script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.js"></script><style>body { margin: 0; padding: 0; }#map { position: absolute; top: 0; bottom: 0; width: 100%; }</style></head><body><style>.boxdraw {background: rgba(56, 135, 190, 0.1);border: 2px solid #3887be;position: absolute;top: 0;left: 0;width: 0;height: 0;}</style> <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',style: 'mapbox://styles/mapbox/streets-v11',center: [-98, 38.88],minZoom: 2,zoom: 3}); // Disable default box zooming.map.boxZoom.disable(); // Create a popup, but don't add it to the map yet.const popup = new mapboxgl.Popup({closeButton: false}); map.on('load', () => {const canvas = map.getCanvasContainer(); // Variable to hold the starting xy coordinates// when `mousedown` occured.let start; // Variable to hold the current xy coordinates// when `mousemove` or `mouseup` occurs.let current; // Variable for the draw box element.let box; // Add a custom vector tileset source. The tileset used in// this example contains a feature for every county in the U.S.// Each county contains four properties. For example:// {// COUNTY: "Uintah County",// FIPS: 49047,// median-income: 62363,// population: 34576// }map.addSource('counties', {'type': 'vector','url': 'mapbox://mapbox.82pkq93d'}); map.addLayer({'id': 'counties','type': 'fill','source': 'counties','source-layer': 'original','paint': {'fill-outline-color': 'rgba(0,0,0,0.1)','fill-color': 'rgba(0,0,0,0.1)'}},'settlement-label'); // Place polygon under these labels. map.addLayer({'id': 'counties-highlighted','type': 'fill','source': 'counties','source-layer': 'original','paint': {'fill-outline-color': '#484896','fill-color': '#6e599f','fill-opacity': 0.75},'filter': ['in', 'FIPS', '']},'settlement-label'); // Place polygon under these labels. // Set `true` to dispatch the event before other functions// call it. This is necessary for disabling the default map// dragging behaviour.canvas.addEventListener('mousedown', mouseDown, true); // Return the xy coordinates of the mouse positionfunction mousePos(e) {const rect = canvas.getBoundingClientRect();return new mapboxgl.Point(e.clientX - rect.left - canvas.clientLeft,e.clientY - rect.top - canvas.clientTop);} function mouseDown(e) {// Continue the rest of the function if the shiftkey is pressed.if (!(e.shiftKey && e.button === 0)) return; // Disable default drag zooming when the shift key is held down.map.dragPan.disable(); // Call functions for the following eventsdocument.addEventListener('mousemove', onMouseMove);document.addEventListener('mouseup', onMouseUp);document.addEventListener('keydown', onKeyDown); // Capture the first xy coordinatesstart = mousePos(e);} function onMouseMove(e) {// Capture the ongoing xy coordinatescurrent = mousePos(e); // Append the box element if it doesnt existif (!box) {box = document.createElement('div');box.classList.add('boxdraw');canvas.appendChild(box);} const minX = Math.min(start.x, current.x),maxX = Math.max(start.x, current.x),minY = Math.min(start.y, current.y),maxY = Math.max(start.y, current.y); // Adjust width and xy position of the box element ongoingconst pos = `translate(${minX}px, ${minY}px)`;box.style.transform = pos;box.style.width = maxX - minX + 'px';box.style.height = maxY - minY + 'px';} function onMouseUp(e) {// Capture xy coordinatesfinish([start, mousePos(e)]);} function onKeyDown(e) {// If the ESC key is pressedif (e.keyCode === 27) finish();} function finish(bbox) {// Remove these events now that finish has been called.document.removeEventListener('mousemove', onMouseMove);document.removeEventListener('keydown', onKeyDown);document.removeEventListener('mouseup', onMouseUp); if (box) {box.parentNode.removeChild(box);box = null;} // If bbox exists. use this value as the argument for `queryRenderedFeatures`if (bbox) {const features = map.queryRenderedFeatures(bbox, {layers: ['counties']}); if (features.length >= 1000) {return window.alert('Select a smaller number of features');} // Run through the selected features and set a filter// to match features with unique FIPS codes to activate// the `counties-highlighted` layer.const fips = features.map((feature) => feature.properties.FIPS);map.setFilter('counties-highlighted', ['in', 'FIPS', ...fips]);} map.dragPan.enable();} map.on('mousemove', (e) => {const features = map.queryRenderedFeatures(e.point, {layers: ['counties-highlighted']}); // Change the cursor style as a UI indicator.map.getCanvas().style.cursor = features.length ? 'pointer' : ''; if (!features.length) {popup.remove();return;} popup.setLngLat(e.lngLat).setText(features[0].properties.COUNTY).addTo(map);});});</script> </body></html>