maps.chandlerswift.com/main.js

import './style.css';
import {Map, View} from 'ol';
import {fromLonLat, get, getTransform, toLonLat, transform} from 'ol/proj.js';
import {defaults as defaultControls} from 'ol/control.js';
import Overlay from 'ol/Overlay.js';
import { applyTransform } from 'ol/extent.js';

import ContextMenu from 'ol-contextmenu';

import ToggleMenuControl from './ui/controls.js';

import layerCategories from './layers/index.js';

import VectorLayer from 'ol/layer/Vector';
import {Vector as VectorSource} from 'ol/source.js';
import GeoJSON from 'ol/format/GeoJSON.js';
import {Style} from 'ol/style.js';
import Icon from 'ol/style/Icon.js';

import qs from 'qs';

import pin from './generic-pin.svg?url';

// from https://openlayers.org/en/latest/examples/popup.html
const container = document.getElementById('popup');
const content = document.getElementById('popup-content');
const closer = document.getElementById('popup-closer');
const popupOverlay = new Overlay({
  element: container,
  autoPan: {
    animation: {
      duration: 250,
    },
  },
});

const contextMenu = new ContextMenu({
  width: 170,
  defaultItems: false,
  items: [
      {
          text: 'Open on OSM',
          callback: obj => {
            const coords = transform(obj.coordinate, 'EPSG:3857', 'EPSG:4326')
            window.open(
              `https://www.openstreetmap.org/#map=${map.getView().getZoom()}/${coords[1]}/${coords[0]}`,
              "_blank",
            );
          },
      },
      {
          text: 'Copy lat/long',
          callback: async function(obj){
            const coords = transform(obj.coordinate, 'EPSG:3857', 'EPSG:4326')
            try {
              await navigator.clipboard.writeText(`${coords[1]}, ${coords[0]}`);
            } catch (error) {
              console.error(error.message);
            }
          },
      },
      {
        text: 'Edit with iD',
        callback: function(obj) {
          const coords = toLonLat(obj.coordinate);
          window.location.href = `https://www.openstreetmap.org/edit?editor=id#map=${map.getView().getZoom()}/${coords[1]}/${coords[0]}`;
        },
      },
      {
        text: 'Edit with JOSM',
        callback: function(obj) {
          const [minx, miny, maxx, maxy] = applyTransform(map.getView().calculateExtent(), getTransform('EPSG:3857', 'EPSG:4326'));

          const url = `http://127.0.0.1:8111/load_and_zoom?left=${minx}&top=${maxy}&right=${maxx}&bottom=${miny}`;
          // inspiration from
          // https://github.com/openstreetmap/openstreetmap-website/blob/27f1fbcb580db21ca1276b9f2c40a6e1571cd90b/app/assets/javascripts/index.js#L257

          const iframe = document.createElement('iframe');
          iframe.setAttribute('src', url);
          iframe.style.display = 'none';
          console.log(iframe);
          iframe.addEventListener('load', iframe.remove);
          document.body.append(iframe);
        },
      }
  ],
});

const map = new Map({
  controls: defaultControls().extend([new ToggleMenuControl(), contextMenu]),
  target: 'map',
  layers: [],
  overlays: [popupOverlay],
  view: new View({
    center: fromLonLat([-93.24151, 44.80376]),
    zoom: 10,
  })
});

// Basic reactivity binding: like vue.js, just worse :)
//
// This implements some basic reactivity so that I can add and remove layers.
// Nothing too fancy, at this point. Eventually, I'll likely pull in proper Vue,
// as I aim for more complex interactions, like layer ordering, color selection,
// custom layer imports, and more.
for (let category of layerCategories) {
  const catDiv = document.createElement("div");
  catDiv.innerHTML = `
    <details ${category.layers.filter(l => l.enabled).length > 0 ? "open" : ""}>
    <summary>${category.name}</summary>
    ${category.details ? "<p>" + category.details + "</p>" : ""}
    <ul></ul>
    </details>
  `;
  for (let layer of category.layers) {
    const li = document.createElement("li");
    li.innerHTML = `
      <label><input type="checkbox"> ${layer.name}</label>
    `;
    li.querySelector("input").addEventListener("change", function(e){
      if (e.target.checked) {
        map.getLayers().push(layer.layer);
      } else {
        map.getLayers().remove(layer.layer);
      }
    });
    catDiv.querySelector("ul").appendChild(li);
  }
  document.querySelector("aside").appendChild(catDiv);
}

const urlParams = qs.parse(window.location.search, { ignoreQueryPrefix: true });
const urlLayers = urlParams.layer ?? [];

for (let category of layerCategories) {
  for (let layer of category.layers) {
    if (urlLayers.includes(layer.name)) {
      layer.enabled = true;
    }
    if (layer.enabled) {
      map.addLayer(layer.layer);
      // I'm a bit rusty on the definitions, but this might be O(n^2), and definitely wouldn't have to be.
      // Keep checkbox state in sync
      for (const label of document.querySelectorAll("aside label")) {
          if (label.innerText.trim() == layer.name) {
            label.querySelector("input[type=checkbox]").checked = true;
          }
      }
    }
  }
}

const customLayerDiv = document.createElement("div");
customLayerDiv.innerHTML = `
<details>
  <summary>Custom</summary>
  <label>Layer Name: <input type="text"></label><br>
  <label>Layer URL: <input type="url"></label><br>
  <label>Color (optional): <input type="color" value="#AA5AF0"></label><br>
  <button>Add</button>
  <small>(must be in GeoJSON format)</small>
  <ul></ul>
</details>`;
const labelInput = customLayerDiv.querySelector('input[type=text]');
const sourceInput = customLayerDiv.querySelector('input[type=url]');
const colorInput = customLayerDiv.querySelector('input[type=color]');

customLayerDiv.querySelector("button").addEventListener("click", function(){
  if (!sourceInput.value.toLowerCase().endsWith(".geojson")) {
    if (!confirm("Input URL doesn't end in .geojson, so is probably not a valid GeoJSON file. Do you want to continue anyway?")) {
      return;
    }
  }
  newCustomLayer(labelInput.value, sourceInput.value, colorInput.value.substring(1));
});
document.querySelector("aside").appendChild(customLayerDiv);

// borrowed from https://github.com/ChartsCSS/charts.css/blob/main/src/general/_variables.scss#L7; randomly ordered
let colors = [
  [170, 90, 240],
  [90, 165, 255],
  [100, 210, 80],
  [180, 180, 180],
  [170, 150, 110],
  [255, 180, 50],
  [240, 50, 50],
  [130, 50, 20],
  [110, 110, 110],
  [255, 220, 90],
];

let used_colors = [];

// HACK
// TIL that [1,1] != [1,1], since arrays are objects, and objects are equal iff
// they are the same object.
Array.prototype.equals = function(other) {
  return this.length == other.length && this.every((e, i) => e === other[i]);
};

function newCustomLayer(name, sourceURL, colorString) {
  let color;
  if (colorString) {
    color = [
      parseInt(colorString.substr(0,2),16),
      parseInt(colorString.substr(2,2),16),
      parseInt(colorString.substr(4,2),16),
    ];
    if (color.length != 3 || color.some(Number.isNaN)) {
      alert("Invalid color provided; using random color instead.");
      color = null;
    }
  }
  if (!color) {
    let available_colors = colors.filter(c => !used_colors.some(i => i.equals(c)));
    if (available_colors) {
      color = available_colors[0];
    } else {
      color = [0, 0, 0]; // If we run out of colors, fall back to black
    }
  }
  used_colors.push(color);
  const li = document.createElement("li");
  const layer = new VectorLayer({
    source: new VectorSource({
      // In case people put in layers that don't serve proper CORS headers, we
      // wrap them in this proxy so they Just Work.
      url: `https://corsproxy.io/?${encodeURIComponent(sourceURL)}`,
      format: new GeoJSON,
    }),
    style: new Style({
        image: new Icon({
            anchor: [0.5, 1],
            src: pin,
            color: color,
        }),
    }),
  });
  li.innerHTML = `
    <label><input type="checkbox" checked><div class="color-badge" style="background-color: rgb(${color.join(', ')});"></div> ${name}</label>
  `;
  li.querySelector("input").addEventListener("change", function(e){
    if (e.target.checked) {
      map.getLayers().push(layer);
    } else {
      map.getLayers().remove(layer);
    }
  });
  map.getLayers().push(layer);
  customLayerDiv.querySelector("ul").appendChild(li);

  // Update input to make sure it's not suggesting an already-used color
  let available_colors = colors.filter(c => !used_colors.some(i => i.equals(c)));
  available_colors.push([0, 0, 0]); // Ensure we always have at least one color available
  document.querySelector('input[type=color]').value = '#' + available_colors[0].map(x => x.toString(16).padStart(2, '0')).join('');
}

if (urlParams.customLayer) {
  for (let customLayer of urlParams.customLayer) {
    newCustomLayer(customLayer['name'], customLayer['url'], customLayer['color'])
  }
}

let location_set = false;

if (urlLayers.length > 0) {
  location_set = true;
  map.once('loadend', function() {
    const layers = map.getLayers();
    map.getView().fit(layers.item(layers.getLength() - 1).getSource().getExtent(), {padding: [20, 20, 20, 20]});
  });
}

function objectToTable(o) {
  // TODO: hack hack hack
  let table = `<table style="margin: 0.5em; border-collapse: collapse;">`;
  for (let [key, value] of Object.entries(o)) {
    if (typeof value === "object" && value !== null) {
      value = objectToTable(value);
    }
    if (typeof value === "string" && /^https?:\/\//.test(value)) {
      value = `<a href="${value}">${value}</a>`
    }
    table += `<tr><td style="border: 1px solid;">${key}</td><td style="border: 1px solid;">${value}</td></tr>`;
  }
  table += `</table>`;
  return table;
}

// from https://openlayers.org/en/latest/examples/icon.html
map.on('click', function (evt) {
  let layer;
  const feature = map.forEachFeatureAtPixel(evt.pixel, function (feature, l) {
    layer = l;
    return feature;
  });
  if (!feature) {
    return;
  }
  if (layer.hasOwnProperty('customPopup')) {
    content.innerHTML = layer.customPopup(feature);
  } else {
    // exclude geometry -- https://stackoverflow.com/a/208106
    const {geometry: _, ...featureData} = feature.getProperties();

    content.innerHTML = objectToTable(featureData);
  }
  if (layer.hasOwnProperty('customPopupCallback')) {
    layer.customPopupCallback(feature);
  }

  popupOverlay.setPosition(evt.coordinate);

  closer.onclick = function (){
    popupOverlay.setPosition(undefined);
    if (layer.hasOwnProperty('destroyPopupCallback')) {
      layer.destroyPopupCallback(feature);
    }
    closer.blur();
    return false;
  };
});

new ResizeObserver(() => map.updateSize()).observe(document.getElementById("map"));

window.map = map;

document.getElementById('source').innerHTML = `<a href="https://git.chandlerswift.com/chandlerswift/maps.chandlerswift.com/commit/${import.meta.env.VITE_GIT_COMMIT_HASH}">Source code</a>
<!--
${import.meta.env.VITE_FILE_DATES}
-->`;