使用queryRenderedFeatures和flyTo使某个标志成为地图中心
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title></title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.29.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.29.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v9',
center: [-90.96, -0.47],
zoom: 8
});
map.on('load', function () {
// add geojson data as a new source
map.addSource("symbols", {
"type": "geojson",
"data": {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [
-91.395263671875,
-0.9145729757782163
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [
-90.32958984375,
-0.6344474832838974
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [
-91.34033203125,
0.01647949196029245
]
}
}
]
}
});
// add source as a layer and apply some styles
map.addLayer({
"id": "symbols",
"type": "symbol",
"source": "symbols",
"layout": {
"icon-image": "rocket-15"
},
"paint": {}
});
});
map.on('click', function (e) {
// Use queryRenderedFeatures to get features at a click event's point
// Use layer option to avoid getting results from other layers
var features = map.queryRenderedFeatures(e.point, { layers: ['symbols'] }); /*queryRenderedFeatures([geometry],[parameters]):返回满足查询参数的可视化特征的GeoJSON特征对象, 注意语法格式 */
// if there are features within the given radius of the click event,
// fly to the location of the click event
if (features.length) { /* features的长度,features是一个数组 */
// Get coordinates from the symbol and center the map on those coordinates
map.flyTo({center: features[0].geometry.coordinates}); /* flyTo (options, [eventData]) */
}
});
// Use the same approach as above to indicate that the symbols are clickable
// by changing the cursor style to 'pointer'.
map.on('mousemove', function (e) {
var features = map.queryRenderedFeatures(e.point, { layers: ['symbols'] }); /* e属于MapMouseEvent,point是其属性,表示鼠标event事件的像素坐标 */
map.getCanvas().style.cursor = features.length ? 'pointer' : '';
});
</script>
</body>
</html>
原文:https://www.mapbox.com/mapbox-gl-js/example/center-on-symbol/