如何更改openlayer 6的视图中心？

分类：编程问答

如何解决如何更改openlayer 6的视图中心？

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
    <link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
    <style>
      html,body,.map {
        margin: 0;
        padding: 0;
        width: 99%;
        height: 95%;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div> 
<div id="mouse-position"></div>

    <script>

proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);
ol.proj.get("EPSG:32643").setExtent([291627,904686,958569,1426831]);

var projection = new ol.proj.Projection({
  code: 'EPSG:32643',extent: [291627,1426831],});
  
var mousePositionControl = new ol.control.MousePosition({
  coordinateFormat: ol.coordinate.createStringXY(4),projection: projection,//'EPSG:32643',// comment the following two lines to have the mouse position
  // be placed within the map.
  className: 'custom-mouse-position',target: document.getElementById('mouse-position'),undefinedHTML: '&nbsp;',});
var scaleLine = new ol.control.ScaleLine({
units: 'metric',});
 
var map = new ol.Map({
  controls: ol.control.defaults().extend([mousePositionControl,scaleLine]),target: 'map',layers: [    
    new ol.layer.Tile({
            source: new ol.source.XYZ({
                url: "http://103.10.168.74:8081/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",projection:projection,tileGrid: ol.tilegrid.createXYZ({
                  extent: [291627,maxResolution: 2605.2421875,tileSize: [256,256],maxZoom: 10,}),new ol.layer.Vector({
        source: new ol.source.Vector({  
            features: [new ol.Feature({
                  geometry: new ol.geom.Point([614971.473,1218630.894]),})],renderBuffer: 200,style: new ol.style.Style({
            image: new ol.style.Icon({
              anchor: [0.5,46],anchorXUnits: 'fraction',anchorYUnits: 'pixels',src: 'https://openlayers.org/en/latest/examples/data/icon.png'
            })
        })
  }),new ol.layer.Vector({
     source: new ol.source.Vector({
         features: [
             new ol.Feature({
        geometry: new ol.geom.Point([716446.977962414,942574.737260181]),})
         ]
     })
  }) 
  ],view: new ol.View({
    projection: projection,units:"metric",zoom:1,maxResolution:2605.2421875,center:[654496.136597752,1155181.26900064],numZoomLevels:13,constrainOnlyCenter: true,maxZoom:10,minZoom:1,})
});
  
mousePositionControl.setProjection(projection);
   </script>
  </body>
</html>

我在ol6中添加了一个矢量层和一个图块层（mapnik和mapproxy）。但是投影存在问题，两层相距较远。我的代码是

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
    <link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,.map {
        margin: 0;
        padding: 0;
        width: 99%;
        height: 99%;
    border:1px solid #ccc;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>

proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);

 //-----vector lyr-----
var london = new ol.Feature({
  geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092,76.9527723])),}); 
london.setStyle(
  new ol.style.Style({
    image: new  ol.style.Icon({
      color: '#4271AE',crossOrigin: 'anonymous',src: 'https://openlayers.org/en/latest/examples/data/icon.png',scale: 0.5,})
);
var vectorSource = new ol.source.Vector({
  features: [london],projection: "EPSG:32643",});

var vectorLayer = new ol.layer.Vector({
  source: vectorSource,});
  //-----vector lyr-----
         
var map = new ol.Map({
  target: 'map',layers: [    
    new ol.layer.Tile({
            source: new ol.source.XYZ({
           url: "http://127.0.01:8080/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",vectorLayer    
  ],view: new ol.View({
    projection: "EPSG:32643",units:"m",center:[8.5149092,76.9527723],})
});

map.getView().fit(vectorSource.getExtent());
map.getView().setZoom(map.getView().getZoom() - 10);

//map.getView().setCenter(ol.proj.transform([8.5149092,'EPSG:32643','EPSG:32643'));

    </script>
  </body>
</html>

我试图更改地图的中心，但是它不起作用。我的地图位于UTM 43N和EPSG的“仪表”中：32643。 我在ol2中使用的程度是291627,1426831和maxResolution：2605.2421875。我还尝试将tileGrid添加到tile图层，但也无法正常工作。

var resolutions = [
    2605.2421875,// don't know how to find resolution
];
tileGrid: new ol.tilegrid.TileGrid({
      extent: [291627,resolutions: resolutions,

解决方法

您的几何形状和中心必须与视图在同一投影中

  geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092,76.9527723],"EPSG:32643")),center: ol.proj.fromLonLat([8.5149092,"EPSG:32643"),

您无需在vectorSource上设置投影。

如果您的图块网格的缩放级别为0到10 tileGrid可以使用

tileGrid: ol.tilegrid.createXYZ({
      extent: [291627,904686,958569,1426831],maxResolution: 2605.2421875,tileSize: [256,256],maxZoom: 10,}),

您可能还希望将投影范围设置为匹配

ol.proj.get("EPSG:32643").setExtent([291627,1426831]);

对于TMS源，其原点位于图块网格的左下方，OpenLayers希望maxResolution与网格范围的高度匹配，但在您的情况下，它与宽度匹配。解决该问题的一种方法是在高度等于宽度的情况下使用更大的范围。添加OSM图层显示它现在处于正确的位置。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
    <link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
    <style>
      html,body,.map {
        margin: 0;
        padding: 0;
        width: 99%;
        height: 95%;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div> 
<div id="mouse-position"></div>

    <script>

proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);
ol.proj.get("EPSG:32643").setExtent([291627,1426831]);

var projection = new ol.proj.Projection({
  code: 'EPSG:32643',extent: [291627,});
  
var mousePositionControl = new ol.control.MousePosition({
  coordinateFormat: ol.coordinate.createStringXY(4),projection: projection,//'EPSG:32643',// comment the following two lines to have the mouse position
  // be placed within the map.
  className: 'custom-mouse-position',target: document.getElementById('mouse-position'),undefinedHTML: '&nbsp;',});
var scaleLine = new ol.control.ScaleLine({
units: 'metric',});
 
var extent = [291627,1426831];
var fullExtent = [extent[0],extent[1],extent[2],extent[1] + extent[2] - extent[0]];

var map = new ol.Map({
  controls: ol.control.defaults().extend([mousePositionControl,scaleLine]),target: 'map',layers: [   
     new ol.layer.Tile({
            source: new ol.source.XYZ({
                url: "http://103.10.168.74:8081/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",projection:projection,tileGrid: ol.tilegrid.createXYZ({
                  extent: fullExtent,new ol.layer.Tile({
      source: new ol.source.OSM(),opacity: 0.5,new ol.layer.Vector({
        source: new ol.source.Vector({  
            features: [new ol.Feature({
                  geometry: new ol.geom.Point([614971.473,1218630.894]),})],renderBuffer: 200,style: new ol.style.Style({
            image: new ol.style.Icon({
              anchor: [0.5,46],anchorXUnits: 'fraction',anchorYUnits: 'pixels',src: 'https://openlayers.org/en/latest/examples/data/icon.png'
            })
        })
  }),new ol.layer.Vector({
     source: new ol.source.Vector({
         features: [
             new ol.Feature({
        geometry: new ol.geom.Point([716446.977962414,942574.737260181]),})
         ]
     })
  }) 
  ],view: new ol.View({
    projection: projection,units:"metric",zoom:1,maxResolution:2605.2421875,center:[654496.136597752,1155181.26900064],numZoomLevels:13,constrainOnlyCenter: true,maxZoom:10,minZoom:1,})
});
  
mousePositionControl.setProjection(projection);
   </script>
  </body>
</html>

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