Urban visualizations with polygon patterns | Sample | ArcGIS Maps SDK for JavaScript

This sample shows how to set pattern fills to polygons. When rendering multiple overlapping polygons representing different types of areas using only color to encode the information, it can become difficult to distinguish between the areas. In urban planning for example, there are areas representing different zones and other overlapping areas representing parcels.

In this example we are using a polygon pattern fill to render the urban renewal area overlay for an urban development plan.

The pattern style is set on the FillSymbol3DLayer on a PolygonSymbol3D:

const symbol = {
  type: "polygon-3d",
  symbolLayers: [
    {
      type: "fill",
      material: { color: "red" },
      outline: { color: "red" },
      pattern: {
        type: "style",
        style: "cross",
      },
    },
  ],
};

arcgis-navigation-toggle

calcite-components

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
    <title>Urban visualizations with polygon patterns | Sample | ArcGIS Maps SDK for JavaScript</title>

    <!-- Load the ArcGIS Maps SDK for JavaScript from CDN -->
    <script type="module" src="https://js.arcgis.com/5.1/"></script>

    <style>
      html,
      body {
        margin: 0;
        height: 100%;
      }
    </style>
  </head>

  <body>
    <arcgis-scene item-id="b7ede4ddceb44073b06081de80cfd150">
      <arcgis-zoom slot="top-left"></arcgis-zoom>
      <arcgis-navigation-toggle slot="top-left"></arcgis-navigation-toggle>
      <arcgis-compass slot="top-left"></arcgis-compass>
      <arcgis-legend slot="top-right"></arcgis-legend>
      <calcite-card slot="bottom-left">
        <calcite-label
          >Select pattern for urban renewal area
          <calcite-select id="patterns" value="cross">
            <calcite-option value="none">None</calcite-option>
            <calcite-option value="backward-diagonal">backward-diagonal</calcite-option>
            <calcite-option value="cross" selected>cross</calcite-option>
            <calcite-option value="diagonal-cross">diagonal-cross</calcite-option>
            <calcite-option value="forward-diagonal">forward-diagonal</calcite-option>
            <calcite-option value="horizontal">horizontal</calcite-option>
            <calcite-option value="vertical">vertical</calcite-option>
          </calcite-select>
        </calcite-label>
      </calcite-card>
    </arcgis-scene>

    <script type="module">
      const [FeatureLayer] = await $arcgis.import(["@arcgis/core/layers/FeatureLayer.js"]);

      // Get a reference to Scene component
      const viewElement = document.querySelector("arcgis-scene");

      // Overlay color for the urban renewal area
      const overlayColor = "#cf385b";

      // Create the overlay FeatureLayer with a 3D polygon symbol and pattern
      const overlay = new FeatureLayer({
        url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/SouthBostonDotAve_Scenario2ProposedZoneChange/FeatureServer/4",
        renderer: {
          type: "simple",
          symbol: {
            type: "polygon-3d",
            symbolLayers: [
              {
                type: "fill",
                material: { color: overlayColor },
                outline: { color: overlayColor },
                pattern: {
                  type: "style",
                  style: "cross",
                },
              },
            ],
          },
        },
        title: "Urban Renewal Area Overlay",
      });

      // Wait for the view to initialize
      await viewElement.viewOnReady();

      // Add the overlay layer to the map
      viewElement.map.add(overlay);

      // Listen for pattern changes and update the renderer
      document.getElementById("patterns").addEventListener("calciteSelectChange", (event) => {
        const renderer = overlay.renderer.clone();
        renderer.symbol.symbolLayers.getItemAt(0).pattern = {
          type: "style",
          style: event.target.value,
        };
        overlay.renderer = renderer;
      });
    </script>
  </body>
</html>