我如何限制地图以仅显示所选国家/地区? [英] how can i Restrict map to show only the selected country?

问题描述

我正在尝试使用openlayers 3制作Web地图应用程序.我有一个要修复的问题.

I am trying to make web map application with openlayers 3. I have a problem which i want to fix.

我正在将OSM层加载为应用程序的基本地图.但是OSM层的问题在于它可以显示整个世界，并且我可以在世界各地平移地图.

I am loading OSM layer as my base map of the application. But the problem with the OSM layer is that it shows whole world and I can pan my map all around the world.

我希望我的应用程序在某些部分得到修复.我已经设置了地图范围，但仍然无法正常工作.

I want my application to be fixed in certain part. I have map extent set but still it doesn't work.

我正在使用minZoom，但没有帮助.

I am using minZoom but it doesn't help.

还有其他方法可以解决这个问题吗?

Is there any other way to fix this prolem?

var centerpos = [84.2, 28.2];
var newpos = ol.proj.transform(centerpos,'EPSG:4326','EPSG:900913');

var baseLayerOSM = new ol.layer.Tile({  
source: new ol.source.MapQuest({
    layer: 'osm'
}),
isBaseLayer:true    
});

var map = new ol.Map({
  layers: [baseLayerOSM],
  target: 'map',
  controls: [new CustomControl()],
  view: new ol.View({
    extent:[80.05844110726194,26.34796712822462,88.2015218371264,30.44742963310623],
    projection : 'EPSG:900913', // OSM projection
    center : newpos,
    minZoom:7,
    zoom: 7
  })
});

这是我的代码.

AJ

推荐答案

基本上，您的示例应该可以工作，但是我认为您忘记了将范围也转换为EPSG:900913/EPSG:3857.

Basically your example should work, but I think you forgot to transform your extent to EPSG:900913 / EPSG:3857 as well.

var maxExtent = [80.05844110726194,26.34796712822462,88.2015218371264,30.44742963310623];

var map = new ol.Map({
  layers: [baseLayerOSM],
  target: 'map',
  controls: [new CustomControl()],
  view: new ol.View({
    extent: ol.proj.transformExtent(maxExtent, 'EPSG:4326', 'EPSG:900913'),
    projection : 'EPSG:900913', // OSM projection
    center : newpos,
    minZoom:7,
    zoom: 7
  })
});

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