此处将Java 3.1的Api映射-非常慢 [英] Here Maps Api for Javascript 3.1 - Very Slow
问题描述
Heres Maps Api for Javascript 3.1和Heres Maps Api for Java 3之间有很大的不同. 加载时间，缩放，路线显示要慢得多，最多3倍.
我们使用的是默认设置，但是即使如此，在使用HERE版本3的一半计算机上，我们也无法使用新版本3.1.它没有加载(无法使用).
该怎么办?我无法将所有计算机都更改为另一台上一代计算机. 是否有一些设置可用于减少地图的响应时间?
您可以做的是加载旧版软件包并使用旧版渲染引擎(不倾斜/不旋转，仅使用栅格基础层):
加载旧版核心软件包:
<!DOCTYPE html>
<html>
<head>
.....
<script src="https://js.api.here.com/v3/3.1/mapsjs-core-legacy.js" type="text/javascript" charset="utf-8"></script>
.....
使用旧版渲染引擎创建地图:
// assuming platform is instantiated
// Obtain the default map types from the platform object:
let defaultLayers = platform.createDefaultLayers();
let map = new H.Map(
document.getElementById('mapContainer'),
defaultLayers.raster.normal.map,
{
zoom: 10,
center: { lat: 52.5, lng: 13.4 },
engineType: H.map.render.RenderEngine.EngineType.P2D
});
默认情况下，分数缩放级别已在3.1中启用，因此，要获得清晰的地图，建议将其禁用:
//assuming that UI and mapevents behavior are instantiated
// disable fractional zooming for Behavior
behavior.disable(H.mapevents.Behavior.Feature.FRACTIONAL_ZOOM);
// add H.ui.ZoomControl with the disabled fractional zooming
var zoomControl = new H.ui.ZoomControl({fractionalZoom: false});
ui.addControl('zoom', zoomControl);
有关更多信息，请参见迁移指南
Between Here Maps Api for Javascript version 3.1 and Here Maps Api for Javascript version 3 is a big difference. The loading time, zooming, routes displaying is much much slower , up to 3 times.
We are usisng the default settings, but even so, on half of our computers on which we used HERE version 3 we cannot use the new version 3.1. It is not loading (cannot be used).
What can be done? I cannot afford to change all the computer to another computers of last generation. Are there some settings which can be used to reduce the responsive time of the maps?
What you could do is to load legacy packages and use legacy rendering engine (no tilting/rotation, only raster base layer):
load legacy core package:
<!DOCTYPE html>
<html>
<head>
.....
<script src="https://js.api.here.com/v3/3.1/mapsjs-core-legacy.js" type="text/javascript" charset="utf-8"></script>
.....
create map with legacy rendering engine:
// assuming platform is instantiated
// Obtain the default map types from the platform object:
let defaultLayers = platform.createDefaultLayers();
let map = new H.Map(
document.getElementById('mapContainer'),
defaultLayers.raster.normal.map,
{
zoom: 10,
center: { lat: 52.5, lng: 13.4 },
engineType: H.map.render.RenderEngine.EngineType.P2D
});
by default, fractional zoom levels are enabled in 3.1, therefore to have crisp map it is recommended to disable it:
//assuming that UI and mapevents behavior are instantiated
// disable fractional zooming for Behavior
behavior.disable(H.mapevents.Behavior.Feature.FRACTIONAL_ZOOM);
// add H.ui.ZoomControl with the disabled fractional zooming
var zoomControl = new H.ui.ZoomControl({fractionalZoom: false});
ui.addControl('zoom', zoomControl);
For more information check the Migration guide
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