如何在OpenLayers-3上将SVG图像用作图层

如何使用OpenLayers-3将SVG图像用作图层(而不是地图标记)

使用任何ol.source.Vector和ol.format.Feature实例时,我无法获得任何SVG图像输出.

小例子:

var mapLayer = new ol.layer.Vector({
    source: new ol.source.Vector({
        url: 'image.svg',
        format: new ol.format.Feature() // http://openlayers.org/en/v3.12.1/apidoc/ol.format.Feature.html
    }),
}); 

我在使用ImageStatic图层时能够获得输出,但这会使用/生成(？)静态图像,因此SVG的优势消失了.

例:

// Not sure if I need this for SVG, but is is required for an image
var extent = [0, 0, 1000, 1000]; // random image size
var projection = new ol.proj.Projection({
    code: 'test',
    units: 'pixels',
    extent: extent
});

var mapLayer = new ol.layer.Image({
    source: new ol.source.ImageStatic({
        url: 'image.svg',
        projection: projection,
        imageExtent: extent
    })
});

我已经尝试过的伎俩与设置Content-type:到image/svg+xml但这并没有帮助我.

那么,再说一遍:我怎样(如果可能的话)使用SVG图像和OpenLayers-3一层？

您不能使用ol.source.Vectorwith svg文件,但OL3可以将svg文件显示为图像.

缩放时图像保持清晰.

我修改了官方静态图像示例,并用svg文件替换了png文件.请参阅下面的runnable示例.

var extent = [0, 0, 512, 512];
var projection = new ol.proj.Projection({
  code: 'static-image',
  units: 'pixels',
  extent: extent
});

var map = new ol.Map({
  layers: [
    new ol.layer.Image({
      source: new ol.source.ImageStatic({
        url: 'https://upload.wikimedia.org/wikipedia/commons/f/fd/Ghostscript_Tiger.svg',
        projection: projection,
        imageExtent: extent
      })
    })
  ],
  target: 'map',
  view: new ol.View({
    projection: projection,
    center: ol.extent.getCenter(extent),
    zoom: 0
  })
});

var svgComment = '';


//Test SVG
//var img = document.createElement('img');
//img.src=src;
//document.body.append(img);

 var commentStyle =  new ol.style.Style({
    image: new ol.style.Icon({
      src: 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(svgComment)
    })
  });

var vectorSource = new ol.source.Vector({
  features: [
      new ol.Feature({
        geometry: new ol.geom.Point([0, 0])
      }) 
  ]
});

var vectorLayer = new ol.layer.Vector({
  name: 'Comments',
  style: commentStyle,
  source: vectorSource
});

//display the map
var rasterLayer = new ol.layer.Tile({
  source: new ol.source.TileJSON({
    url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure',
    crossOrigin: ''
  })
});

var map = new ol.Map({
  layers: [rasterLayer, vectorLayer],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [0, 0],
    zoom: 3
  })
});