Change layer order

Move layers up and down in the map.

terrain
toner
watercolor

0% Map style by Stamen Design, © OpenStreetMap contributors

index.js

import StadiaMaps from "ol/source/StadiaMaps.js";

import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import Instance from "@giro3d/giro3d/core/Instance.js";
import ColorLayer from "@giro3d/giro3d/core/layer/ColorLayer.js";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import TiledImageSource from "@giro3d/giro3d/sources/TiledImageSource.js";

const crs = "EPSG:3857";
const mapExtent = Extent.fromCenterAndSize(
  crs,
  { x: 256227, y: 5882214 },
  2000000,
  2000000,
);

const instance = new Instance({
  target: "view",
  crs,
});

instance.view.camera.position.set(256227, 5882214, 4000000);

const map = new Map({ extent: mapExtent, backgroundOpacity: 0 });

instance.add(map);

const layerSize = 1000000;

const watercolor = new ColorLayer({
  name: "watercolor",
  extent: Extent.fromCenterAndSize(
    crs,
    { x: -100000, y: 6169226 },
    layerSize,
    layerSize,
  ),
  source: new TiledImageSource({
    source: new StadiaMaps({ layer: "stamen_watercolor", wrapX: false }),
  }),
});

const toner = new ColorLayer({
  name: "toner",
  extent: Extent.fromCenterAndSize(
    crs,
    { x: 500000, y: 5669226 },
    layerSize,
    layerSize,
  ),
  source: new TiledImageSource({
    source: new StadiaMaps({ layer: "stamen_toner", wrapX: false }),
  }),
});

const terrain = new ColorLayer({
  name: "terrain",
  extent: Extent.fromCenterAndSize(
    crs,
    { x: 900000, y: 5169226 },
    layerSize,
    layerSize,
  ),
  source: new TiledImageSource({
    source: new StadiaMaps({ layer: "stamen_terrain", wrapX: false }),
  }),
});

map.addLayer(watercolor);
map.addLayer(toner);
map.addLayer(terrain);

Inspector.attach("inspector", instance);

const layers = {
  watercolor,
  toner,
  terrain,
};

function bindUI(layer) {
  const id = layer.name;
  const btnUp = document.getElementById(`btn-${id}-up`);
  const btnDown = document.getElementById(`btn-${id}-down`);
  const layerElt = document.getElementById(`${id}`);
  layerElt.layer = layer;
  const container = layerElt.parentNode;

  function reorder() {
    [...container.children]
      .sort((a, b) =>
        map.getIndex(layers[a.id]) > map.getIndex(layers[b.id]) ? -1 : 1,
      )
      .forEach((node) => container.appendChild(node));
  }

  btnUp.onclick = () => {
    map.moveLayerUp(layer);
    reorder();
  };
  btnDown.onclick = () => {
    map.moveLayerDown(layer);
    reorder();
  };

  reorder();
}

bindUI(watercolor);
bindUI(toner);
bindUI(terrain);

index.html

<!doctype html>
<html lang="en">
  <head>
    <title>Change layer order</title>
    <meta charset="UTF-8" />
    <meta name="name" content="layer_ordering" />
    <meta name="description" content="Move layers up and down in the map." />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
    <link
      href="https://giro3d.org/assets/bootstrap-custom.css"
      rel="stylesheet"
    />
    <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
    <link
      rel="stylesheet"
      type="text/css"
      href="https://giro3d.org/latest/examples/css/example.css"
    />
  </head>

  <body>
    <div id="view" class="m-0 p-0 w-100 h-100"></div>
    <div
      id="inspector"
      class="position-absolute top-0 start-0 mh-100 overflow-auto"
    ></div>

    <div class="side-pane-with-status-bar">
      <div class="card">
        <div class="card-body p-0">
          <ul id="layer-list" class="list-group list-group-flush">
            <li id="terrain" class="list-group-item">
              <div class="float-start align-start mx-4">terrain</div>
              <div
                class="btn-group btn-group-sm float-end"
                role="group"
                aria-label="Basic example"
              >
                <button
                  id="btn-terrain-up"
                  type="button"
                  class="btn btn-primary"
                >
                  Up
                </button>
                <button
                  id="btn-terrain-down"
                  type="button"
                  class="btn btn-primary"
                >
                  Down
                </button>
              </div>
            </li>

            <li id="toner" class="list-group-item">
              <div class="float-start align-start mx-4">toner</div>
              <div
                class="btn-group btn-group-sm float-end"
                role="group"
                aria-label="Basic example"
              >
                <button id="btn-toner-up" type="button" class="btn btn-primary">
                  Up
                </button>
                <button
                  id="btn-toner-down"
                  type="button"
                  class="btn btn-primary"
                >
                  Down
                </button>
              </div>
            </li>

            <li id="watercolor" class="list-group-item">
              <div class="float-start align-start mx-4">watercolor</div>
              <div
                class="btn-group btn-group-sm float-end"
                role="group"
                aria-label="Basic example"
              >
                <button
                  id="btn-watercolor-up"
                  type="button"
                  class="btn btn-primary"
                >
                  Up
                </button>
                <button
                  id="btn-watercolor-down"
                  type="button"
                  class="btn btn-primary"
                >
                  Down
                </button>
              </div>
            </li>
          </ul>
        </div>
      </div>
    </div>

    <script type="module" src="index.js"></script>
    <script>
      /* activate popovers */
      const popoverTriggerList = [].slice.call(
        document.querySelectorAll('[data-bs-toggle="popover"]'),
      );
      popoverTriggerList.map(
        // bootstrap is used as script in the template, disable warning about undef
        // eslint-disable-next-line no-undef
        (popoverTriggerEl) =>
          new bootstrap.Popover(popoverTriggerEl, {
            trigger: "hover",
            placement: "left",
            content: document.getElementById(
              popoverTriggerEl.getAttribute("data-bs-content"),
            ).innerHTML,
            html: true,
          }),
      );
    </script>
  </body>
</html>

package.json

{
    "name": "layer_ordering",
    "dependencies": {
        "@giro3d/giro3d": "0.42.5"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}