154 lines
5.0 KiB
HTML
154 lines
5.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Add an animated icon to the map</title>
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<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
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<link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet">
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<script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.js"></script>
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<style>
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body { margin: 0; padding: 0; }
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#map { position: absolute; top: 0; bottom: 0; width: 100%; }
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</style>
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</head>
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<body>
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<div id="map"></div>
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<script>
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mapboxgl.accessToken = 'pk.eyJ1IjoicWl1c2hpamllIiwiYSI6ImNsMDNvbWh3YjFmdDgzam1scG92MXF5YXcifQ.Gmzww19TIvd1O14xrxKCRQ';
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const map = new mapboxgl.Map({
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container: 'map',
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center: [0, 0],
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zoom: 2,
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// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
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style: 'mapbox://styles/mapbox/streets-v12'
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});
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const size = 200;
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// This implements `StyleImageInterface`
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// to draw a pulsing dot icon on the map.
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const pulsingDot = {
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width: size,
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height: size,
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data: new Uint8Array(size * size * 4),
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// When the layer is added to the map,
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// get the rendering context for the map canvas.
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onAdd: function () {
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const canvas = document.createElement('canvas');
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canvas.width = this.width;
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canvas.height = this.height;
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this.context = canvas.getContext('2d');
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},
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// Call once before every frame where the icon will be used.
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render: function () {
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const duration = 1000;
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const t = (performance.now() % duration) / duration;
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const radius = (size / 2) * 0.3;
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const outerRadius = (size / 2) * 0.7 * t + radius;
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const context = this.context;
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// Draw the outer circle.
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// 将该区域内的像素设置为透明，擦除
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context.clearRect(0, 0, this.width, this.height);
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// 清空子路径列表，开始一个新的路径
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context.beginPath();
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// // 绘制圆
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// context.arc(
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// this.width / 2,
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// this.height / 2,
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// outerRadius,
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// 0,
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// Math.PI * 2
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// );
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// context.fillStyle = `rgba(255, 200, 200, ${1 - t})`;
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// context.fill();
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// 绘制外矩形，计算外矩形坐标和宽高
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const outerWidth = this.width * 0.7 * t + radius;
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const outerHeight = this.height * 0.7 * t + radius;
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const startX = (this.width - outerWidth)/2;
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const startY = (this.height - outerHeight)/2;
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context.rect(startX,startY,outerWidth,outerHeight)
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context.fillStyle = `rgba(255, 200, 200, ${1 - t})`;
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context.fill();
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// Draw the inner circle.
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context.beginPath();
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// context.arc(
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// this.width / 2,
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// this.height / 2,
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// radius,
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// 0,
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// Math.PI * 2
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// );
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// 绘制内部矩形
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const innerWidth = this.width * 0.3;
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const innerHeight = this.height * 0.3;
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const startX1 = (this.width - innerWidth)/2;
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const startY1 = (this.height - innerHeight)/2;
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context.rect(startX1,startY1,innerWidth,innerHeight)
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context.fillStyle = 'rgba(255, 100, 100, 0.6)';
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context.strokeStyle = 'white';
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context.lineWidth = 2 + 4 * (1 - t);
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context.fill();
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context.stroke();
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context.clearRect(innerWidth+20, innerHeight+20, innerWidth-20, innerHeight - 20);
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// Update this image's data with data from the canvas.
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this.data = context.getImageData(
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0,
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0,
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this.width,
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this.height
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).data;
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// Continuously repaint the map, resulting
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// in the smooth animation of the dot.
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map.triggerRepaint();
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// Return `true` to let the map know that the image was updated.
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return true;
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}
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};
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map.on('load', () => {
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map.addImage('pulsing-dot', pulsingDot, { pixelRatio: 2 });
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map.addSource('dot-point', {
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'type': 'geojson',
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'data': {
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'type': 'FeatureCollection',
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'features': [
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{
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'type': 'Feature',
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'geometry': {
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'type': 'Point',
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'coordinates': [0, 0] // icon position [lng, lat]
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}
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}
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]
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}
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});
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map.addLayer({
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'id': 'layer-with-pulsing-dot',
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'type': 'symbol',
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'source': 'dot-point',
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'layout': {
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'icon-image': 'pulsing-dot'
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}
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});
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});
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</script>
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</body>
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</html> |