从Openlayers 3视口中获取所有功能 [英] Get all features from the Openlayers 3 viewport

问题描述

我正在尝试找出Openlayers 3的图层上所有可见(视口)的功能.

I am trying to find out all the features which are visible (viewport) on a layer in Openlayers 3.

如果我向地图添加点击事件，如下所示，我就能找出一个功能.但是我找不到在视口中可见的所有功能.有人可以帮忙吗?

I am able to find out a single feature if I add a click event to the map which is as follows. But I am not able to find all the features which are visible in the viewport. Could anyone help with this?

map.on('click', function(evt) {
        var feature = map.forEachFeatureAtPixel(evt.pixel,
            function(feature, layer) {
                return feature;
            });
});

推荐答案

我建议您首先了解一下视图的范围:

I propose that first you get the extent of the view :

var extent = yourMap.getView().calculateExtent(yourMmap.getSize());

然后获得此范围内的所有功能:

then get all features within this extent :

yourVectorSource.forEachFeatureInExtent(extent, function(feature){
    // do something 
}); 

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