From 8d250c86386d95a907465c29c356e2b5de261f67 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Thu, 18 Jan 2024 14:50:06 +0100
Subject: =?UTF-8?q?Add=20features=20from=20Svenska=20Kraftn=C3=A4t.?=
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Source: https://ext-geodatakatalog-forv.lansstyrelsen.se/PlaneringsKatalogen/GetMetaDataById?id=08ec56a0-6b5c-4f83-b29e-375e6f1a34b9_C
---
 index.html |   3 ++
 main.js    | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 119 insertions(+)

diff --git a/index.html b/index.html
index a43e291..d9323a2 100644
--- a/index.html
+++ b/index.html
@@ -24,6 +24,9 @@
               på uppdrag av <a href="https://www.klimatanalysnorr.se" class="link-body-emphasis">Klimat Analys Norr projektet</a>.</p>
             <p class="mb-0">Källor och licensinformation:</p>
             <ul>
+              <li>Transmissionsnät för el från
+                <a href="https://www.svk.se" target="_blank" class="link-dark">Svenska Kraftnät</a>.
+              </li>
               <li>Bakgrund kartor från
                 &copy; <a href="https://lantmateriet.se" target="_blank" class="link-dark">Lantmäteriet</a>, CC0
                 (<a href="https://www.lantmateriet.se/sv/geodata/vara-produkter/oppna-data/#anchor-1" class="link-dark">öppna data</a>).
diff --git a/main.js b/main.js
index 90e059f..3e9cdb4 100644
--- a/main.js
+++ b/main.js
@@ -27,6 +27,17 @@ import ScaleLine from 'ol/control/ScaleLine.js';
 import Zoom from 'ol/control/Zoom.js';
 import ZoomSlider from 'ol/control/ZoomSlider.js';
 
+import MVT from 'ol/format/MVT.js';
+import VectorTileLayer from 'ol/layer/VectorTile.js';
+import VectorTile from 'ol/source/VectorTile.js';
+import {createXYZ} from 'ol/tilegrid.js';
+
+import CircleStyle from 'ol/style/Circle.js';
+import Fill from 'ol/style/Fill.js';
+import RegularShape from 'ol/style/RegularShape.js';
+import Stroke from 'ol/style/Stroke.js';
+import Style from 'ol/style/Style.js';
+
 import proj4 from 'proj4';
 import { get as getProjection } from 'ol/proj.js';
 import { register as registerProjection } from 'ol/proj/proj4.js';
@@ -432,6 +443,111 @@ view.on('change', function(event) {
 });
 
 
+const styles = {
+  'svk_lines':
+    [1, 1.5, 2, 2, 2, 2, 3, 4, 5, 6, 8, 10].map(function(width) {
+      return new Style({
+        zIndex: 2,
+        stroke: new Stroke({
+          color: 'black',
+          width: width,
+        }),
+      });
+    }),
+  'svk_pylons':
+    [undefined, undefined, undefined, undefined, undefined]
+    .concat([3, 4, 5, 6, 8, 10, 15].map(function(radius) {
+        return new Style({
+          zIndex: 1,
+          image: new CircleStyle({
+            radius: radius,
+            fill: new Fill({
+              color: 'black',
+            }),
+          }),
+        });
+    })),
+  'svk_stations':
+    [5, 6, 8, 8, 10].map(function(radius) {
+      return new Style({
+        zIndex: 0,
+        image: new RegularShape({
+          radius: radius,
+          points: 4,
+          angle: Math.PI/4,
+          fill: new Fill({
+            color: 'black',
+          }),
+        }),
+      });
+    })
+    .concat([12, 15].map(function(radius) {
+      return new Style({
+        zIndex: 0,
+        image: new RegularShape({
+          radius: radius,
+          points: 4,
+          angle: Math.PI/4,
+          fill: new Fill({
+            color: 'rgba(128, 128, 128, .85)',
+          }),
+          stroke: new Stroke({
+            width: 1,
+            color: 'rgb(0, 0, 0)',
+          }),
+        }),
+      });
+    }))
+    .concat([1, 1.5, 1.5, 2, 2].map(function(width) {
+      return new Style({
+        zIndex: 0,
+        fill: new Fill({
+          color: 'rgba(128, 128, 128, .7)',
+        }),
+        stroke: new Stroke({
+          width: width,
+          color: 'rgb(0, 0, 0)',
+        }),
+      });
+    })),
+};
+
+map.addLayer(new VectorTileLayer({
+  source: new VectorTile({
+    url: '/public/xyztiles/{z}/{x}/{y}.pbf',
+    format: new MVT({
+      layers: Object.keys(styles),
+    }),
+    projection: projection,
+    wrapX: false,
+    transition: 0,
+    tileGrid: createXYZ({
+      extent: extent,
+      tileSize: 1024,
+      maxResolution: 1024, /* = 1048576/1024 */
+      minZoom: 0,
+      maxZoom: 9,
+    }),
+  }),
+  /* XXX switch to 'hybrid' if there are perf issues; but that seems to
+   * put lines above points regardless of their respective z-index */
+  renderMode: 'vector',
+  declutter: false,
+  style: function(feature, resolution) {
+    const style = styles[feature.getProperties().layer];
+    if (!Array.isArray(style)) {
+      return style;
+    } else {
+      const maxi = style.length - 1;
+      const z = resolutions.length - 2 - Math.log2(resolution);
+      /* use Math.floor() as VectorTile.js calls getZForResolution(resolution, 1) */
+      const i = z <= 0 ? 0 : z >= maxi ? maxi : Math.floor(z);
+      // console.log(`resolution=${resolution}, z=${z}, i=${i}`);
+      return style[i];
+    }
+  },
+}));
+
 /* layer selection panel */
 (function() {
   const modal = document.getElementById('layer-selection-panel');
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