开放层6-图像层与矢量层结合

问题描述 投票:-3回答:1

我正在尝试将图像层与矢量层组合在一起,但是当我向“视图”添加投影时,矢量消失了。我做错了吗?

以下是我要实现的目标的示例:https://stackblitz.com/edit/react-ol6

我希望下面的这两层在视图中在一起。

Vector Layer

Image Layer

javascript image gis openlayers openlayers-6
1个回答
0
投票

对于那些寻找答案的人,Mike提供了一个很好的解决方案,其中您可以将范围值设置为等于矢量层的扩展范围。再次谢谢你。

var extent = [-e,-e,e,e];
var source = new VectorSource({});

var vectorLayer = new VectorLayer({
    source: source,
});

var imageLayer = new ImageLayer({
    source: new Static({
        url: "https://imgs.xkcd.com/comics/online_communities.png",
        projection: new Projection({
            units: "pixels",
            extent: extent
        }),
        imageExtent: extent,
    }),
});
vectorLayer.setZIndex(1);
imageLayer.setZIndex(0);

var olMap = new Map({
    target: null,
    layers: [imageLayer, vectorLayer],

    view: new View({


    projection: new Projection({
          units: "pixels",
              extent: extent,
       }),
        center: getCenter(extent),
   // center: [0,0],
        zoom: 0,
    }),
});

class App extends Component {
    componentDidMount() {
    olMap.setTarget("olmap");
        vectorLayer.getSource().addFeatures(features);
    }

    render() {
        return (
            <div className="App">
                <div id="olmap" style={{ width: "100%", height: "80%" }} />
            </div>
        );
    }
}

这也是他分享的闪电战:https://stackblitz.com/edit/react-ol6-xw1x9l

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