Proj4js

by Vladimir Vershinin

HTML

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>
<script src="https://unpkg.com/[email protected]/dist/proj4-src.js"></script>
<script src="https://unpkg.com/[email protected]/dist/ol.js"></script>
<script src="https://unpkg.com/[email protected]/lib/index.umd.js"></script>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/lib/style.min.css">
<div id="app">
<div>
  View Projection: {{ viewProj }}<br>
  Center (EPSG:4326): {{ center }}
</div>

  <vl-map ref="map">
    <vl-view :projection="viewProj" :zoom.sync="zoom" :center.sync="center"></vl-view>
  
    <vl-layer-tile>
      <vl-source-wms url="https://wms.geo.admin.ch/" layers="ch.swisstopo.pixelkarte-farbe-pk1000.noscale" :ext-params="{FORMAT: 'image/jpeg'}" server-type="mapserver" cross-origin="anonymous" :attributions="attributions" :projection="viewProj"></vl-source-wms>
    </vl-layer-tile>
  </vl-map>
  
</div>

CSS

html, body, #app {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

proj4.defs('EPSG:21781',
        '+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 +k_0=1 ' +
          '+x_0=600000 +y_0=200000 +ellps=bessel ' +
          '+towgs84=660.077,13.551,369.344,2.484,1.783,2.939,5.66 +units=m +no_defs')
          
Vue.use(VueLayers)
// register custom projection

let center = [660000, 190000]
let extent = [420000, 30000, 900000, 350000]

new Vue({
	el: '#app',
  data () {
  	return {
    	zoom: 2,
      center: center,
      viewProj: 'EPSG:21781',
      viewExtent: extent,
      attributions: `© <a href="http://www.geo.admin.ch/internet/geoportal/en/home.html">Pixelmap 1:1000000 / geo.admin.ch</a>`
    }
  },
})