在 HERE 地图中有许多 SVG DomMarkers 会导致延迟
Having many SVG DomMarkers in HERE maps causes lag
我在 angular 项目中使用 HERE 地图 3.0（也尝试过 3.1 并遇到同样的问题）和默认图层。该地图的 DomMarkers 使用复杂的 SVG 图标，在 div 内有许多路径。
我注意到添加许多标记（超过 200 个）会导致缩放或在地图上移动时出现延迟。
我使用 SVG 而不是静态图像文件，以便能够在将图标添加到地图之前更改颜色和修改图标的形状。
使用具有多个 div 形状的 dom 图标而不是 SVG，会导致相同的滞后。
如果我使用更简单的 SVG 或简单的 div，延迟会显着减少。
是什么导致了滞后？是因为 SVG 的复杂性，还是它的路径又大又多？
有没有办法拥有复杂的 SVG 标记并消除延迟？
我的 SVG：
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="Layer_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="-656 895.2 221.2 259.8" style="enable-background:new -656 895.2 221.2 259.8;" xml:space="preserve">
<g>
<path fill="white" d="M-489.9,937.4c-15.8-16.3-36.6-25.3-58.5-25.3c-46.8,0-84.8,41.1-84.8,91.6c0,13.3,2.5,25.9,7.4,37.2
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</g>
<g>
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<g>
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标记从 for 循环添加到已添加到地图中的组 (H.map.Group)。延迟不是在加载标记时发生的，而是在尝试在地图上移动或放大和缩小时发生的。它非常慢，尤其是在缩小并且可以看到许多标记时。
在地图中添加组：
this.map.addObject(this.markerGroup);
添加标记：
addMarker(data) {
const id = data.id;
if (!mapObjects[id]) {
let coords;
coords = { lat: data.lat, lng: data.lon };
const icon = new H.map.DomIcon(this.createMarkerIcon(data));
this.mapObjects[id] = new H.map.DomMarker(coords, { icon: icon });
this.mapObjects[id].setData(data);
this.markerGroup.addObject(this.mapObjects[id]);
} else if (this.markerChanged(data)) {
this.updateMarker(data);
}
}
添加标记的循环：
markers.forEach(markerData => {
this.addMarker(markerData);
});
编辑：添加了 svg，添加了片段
缓存可以帮助您避免这种缩小延迟。使用复杂的 svg 一次又一次地读取更大的标记数据使其变得滞后。您可以尝试将标记存储在一个变量中，如果数据没有一直变化，则将其缓存，如下所示
var testObject = { 'one': 1, 'two': 2, 'three': 3 };
// Put the object into storage
localStorage.setItem('testObject', JSON.stringify(testObject));
// Retrieve the object from storage
var retrievedObject = localStorage.getItem('testObject');
问题是我使用了 H.map.DomMarker 而不是 H.map.Marker，许多 html 元素导致地图滞后。
H.map.Marker在地图上呈现并且不会导致缩放和移动滞后。
我在 angular 项目中使用 HERE 地图 3.0（也尝试过 3.1 并遇到同样的问题）和默认图层。该地图的 DomMarkers 使用复杂的 SVG 图标，在 div 内有许多路径。
我注意到添加许多标记（超过 200 个）会导致缩放或在地图上移动时出现延迟。 我使用 SVG 而不是静态图像文件，以便能够在将图标添加到地图之前更改颜色和修改图标的形状。 使用具有多个 div 形状的 dom 图标而不是 SVG，会导致相同的滞后。
如果我使用更简单的 SVG 或简单的 div，延迟会显着减少。 是什么导致了滞后？是因为 SVG 的复杂性，还是它的路径又大又多？ 有没有办法拥有复杂的 SVG 标记并消除延迟？
我的 SVG：
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="Layer_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="-656 895.2 221.2 259.8" style="enable-background:new -656 895.2 221.2 259.8;" xml:space="preserve">
<g>
<path fill="white" d="M-489.9,937.4c-15.8-16.3-36.6-25.3-58.5-25.3c-46.8,0-84.8,41.1-84.8,91.6c0,13.3,2.5,25.9,7.4,37.2
c12.9,30.9,48.3,84.6,68,109.5c2.3,2.9,5.7,4.6,9.4,4.6c3.5,0,6.7-1.5,9.1-4.2l0.1-0.2l0.1-0.2c19.5-24.5,54.8-77.9,68-109.4
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<path fill="#775DD0" d="M-548.3,920.4c-42.4,0-76.9,37.4-76.9,83.5c0,12,2.2,23.4,6.7,34c12.5,30,47.1,82.6,66.8,107.6
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C-471.4,957.7-505.9,920.4-548.3,920.4z"/>
</g>
<g>
<path fill="white" d="M-454.5,1067.8h-47.8c-10.9,0-19.7,8.9-19.7,19.7v47.8c0,10.9,8.9,19.7,19.7,19.7h47.8
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<path fill="#775DD0" d="M-454.5,1077.8h-47.8c-5.4,0-9.7,4.4-9.7,9.7v47.8c0,5.4,4.3,9.7,9.7,9.7h47.8c5.4,0,9.7-4.4,9.7-9.7v-47.8
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<path fill="white" d="M-461.6,1094.7l-22,24.8l-11-12.4c-2-2.2-5.3-2.2-7.4,0c-2,2.2-2,6,0,8.3l14.7,16.5
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</g>
<g>
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标记从 for 循环添加到已添加到地图中的组 (H.map.Group)。延迟不是在加载标记时发生的，而是在尝试在地图上移动或放大和缩小时发生的。它非常慢，尤其是在缩小并且可以看到许多标记时。
在地图中添加组：
this.map.addObject(this.markerGroup);
添加标记：
addMarker(data) {
const id = data.id;
if (!mapObjects[id]) {
let coords;
coords = { lat: data.lat, lng: data.lon };
const icon = new H.map.DomIcon(this.createMarkerIcon(data));
this.mapObjects[id] = new H.map.DomMarker(coords, { icon: icon });
this.mapObjects[id].setData(data);
this.markerGroup.addObject(this.mapObjects[id]);
} else if (this.markerChanged(data)) {
this.updateMarker(data);
}
}
添加标记的循环：
markers.forEach(markerData => {
this.addMarker(markerData);
});
编辑：添加了 svg，添加了片段
缓存可以帮助您避免这种缩小延迟。使用复杂的 svg 一次又一次地读取更大的标记数据使其变得滞后。您可以尝试将标记存储在一个变量中，如果数据没有一直变化，则将其缓存，如下所示
var testObject = { 'one': 1, 'two': 2, 'three': 3 };
// Put the object into storage
localStorage.setItem('testObject', JSON.stringify(testObject));
// Retrieve the object from storage
var retrievedObject = localStorage.getItem('testObject');
问题是我使用了 H.map.DomMarker 而不是 H.map.Marker，许多 html 元素导致地图滞后。
H.map.Marker在地图上呈现并且不会导致缩放和移动滞后。