leaflet-tilelayer-colorpicker/TileLayerWithColorPicker.html at master · frogcat/leaflet-tilelayer-colorpicker · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>TileLayerWithColorPicker for leaflet 2.0.0-alpha.1</title>
    <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0" />
    <link href="https://unpkg.com/leaflet@2.0.0-alpha.1/dist/leaflet.css" rel="stylesheet" />
    <script type="importmap">
      {
        "imports": {
          "leaflet": "https://unpkg.com/leaflet@2.0.0-alpha.1/dist/leaflet.js",
          "colorpicker": "./TileLayerWithColorPicker.js"
        }
      }
    </script>
  </head>
  <body>
    <div id="map" style="position: absolute; top: 0; left: 0; right: 0; bottom: 0"></div>
    <script type="module">
      import { Map } from "leaflet";
      import TileLayerWithColorPicker from "colorpicker";

      const map = new Map("map").setView([35.6323, 139.768815], 15);

      const colorpicker = new TileLayerWithColorPicker(
        "https://cyberjapandata.gsi.go.jp/xyz/pale/{z}/{x}/{y}.png",
        {
          maxZoom: 18,
          attribution: '<a href="https://maps.gsi.go.jp/development/ichiran.html">GSI pale</a>',
        }
      ).addTo(map);

      map.on("pointermove", function (event) {
        const a = colorpicker.getColor(event.latlng);
        if (a !== null) {
          const hex = "#" + (0x1000000 + (a[0] << 16) + (a[1] << 8) + a[2]).toString(16).substr(1);
          var tmpl = "<b style='background:@;color:black;'>@</b>";
          if (Math.min(a[0], a[1], a[2]) < 0x40) tmpl = tmpl.replace("black", "white");
          map.attributionControl.setPrefix(tmpl.replace(/@/g, hex));
        } else {
          map.attributionControl.setPrefix("unavailable");
        }
      });
    </script>
  </body>
</html>