Modify Icon

<!--
  说明：图标位置修改
  核心逻辑：Modify 交互拖动图标更新 Point 坐标，modifyend 输出经纬度并支持旋转
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>图标位置修改</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@10.3.1/ol.css">
<style>
  html,body{height:100%;margin:0}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  .bar{flex:0 0 auto;padding:8px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:10px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar button{font:inherit;padding:4px 10px;border:1px solid #c9d0da;border-radius:5px;
              background:#fff;color:#1f2a37;cursor:pointer}
  #info{margin-left:auto}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <button id="rotate">旋转 90°</button>
  <span>拖动图标调整位置</span>
  <span id="info">—</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('map').innerHTML =
      '<div style="padding:20px;color:#b42318">OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var fromLonLat = ol.proj.fromLonLat;

  function iconData() {
    var canvas = document.createElement('canvas');
    canvas.width = 30;
    canvas.height = 30;
    var ctx = canvas.getContext('2d');
    ctx.beginPath();
    ctx.moveTo(15, 2);
    ctx.lineTo(28, 26);
    ctx.lineTo(2, 26);
    ctx.closePath();
    ctx.fillStyle = '#1f5fd0';
    ctx.fill();
    ctx.strokeStyle = '#ffffff';
    ctx.lineWidth = 2;
    ctx.stroke();
    ctx.beginPath();
    ctx.arc(15, 19, 3, 0, Math.PI * 2);
    ctx.fillStyle = '#ffffff';
    ctx.fill();
    return canvas.toDataURL();
  }

  var iconSrc = iconData();
  var rotation = 0;

  var feature = new ol.Feature({ geometry: new ol.geom.Point(fromLonLat([116.391, 39.907])) });

  var source = new ol.source.Vector({ features: [feature] });

  function styleFn() {
    return new ol.style.Style({
      image: new ol.style.Icon({
        src: iconSrc,
        anchor: [0.5, 0.5],
        rotation: rotation
      })
    });
  }

  var layer = new ol.layer.Vector({ source: source, style: styleFn });

  var map = new ol.Map({
    target: 'map',
    layers: [new ol.layer.Tile({ source: new ol.source.XYZ({url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}', attributions: 'Tiles © Esri'}) }), layer],
    view: new ol.View({ center: fromLonLat([116.391, 39.907]), zoom: 14, minZoom: 2, maxZoom: 19 }),
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });

  var modify = new ol.interaction.Modify({ source: source, pixelTolerance: 14 });
  map.addInteraction(modify);

  var info = document.getElementById('info');

  function report() {
    var ll = ol.proj.toLonLat(feature.getGeometry().getCoordinates());
    info.textContent = '经度 ' + ll[0].toFixed(6) + ' · 纬度 ' + ll[1].toFixed(6) +
      ' · 旋转 ' + (rotation * 180 / Math.PI).toFixed(0) + '°';
  }

  modify.on('modifyend', function () {
    layer.changed();
    report();
  });

  document.getElementById('rotate').addEventListener('click', function () {
    rotation += Math.PI / 2;
    layer.changed();
    report();
  });

  report();
})();
</script>
</body>
</html>