Restrict the map view area

vanilla.html

common.ts

react.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
    <script crossorigin src="https://cdn.jsdelivr.net/npm/@turf/turf@6/turf.min.js"></script>
    <script crossorigin src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script>
    <!-- To make the map appear, you must add your apikey -->
    <script src="https://js.api.mappable.world/v3/?apikey=<YOUR_APIKEY>&lang=en_US" type="text/javascript"></script>

    <script
      data-plugins="transform-modules-umd"
      data-presets="typescript"
      type="text/babel"
      src="./common.ts"
    ></script>
    <script data-plugins="transform-modules-umd" data-presets="typescript" type="text/babel">
      import {
        BIG_RESTRICT_AREA,
        LITTLE_RESTRICT_AREA,
        BIG_ZOOM_RANGE,
        LITTLE_ZOOM_RANGE,
        boundsToPolygonCoordinates
      } from './common';

      window.map = null;

      main();
      async function main() {
        // Waiting for all api elements to be loaded
        await mappable.ready;
        const {MMap, MMapDefaultSchemeLayer, MMapDefaultFeaturesLayer, MMapFeature, MMapControls, MMapControlButton} =
          mappable;
        // Initialize the map
        map = new MMap(
          // Pass the link to the HTMLElement of the container
          document.getElementById('app'),
          // Pass the map initialization parameters, set the map location bounds with the current restricted area
          {
            location: {bounds: LITTLE_RESTRICT_AREA},
            restrictMapArea: LITTLE_RESTRICT_AREA,
            zoomRange: LITTLE_ZOOM_RANGE
          },
          // Add a map schema layer and a geo objects layer
          [new MMapDefaultSchemeLayer({}), new MMapDefaultFeaturesLayer({})]
        );

        // Create and add a polygon to the map that will mark the border of the map restrict area
        const borderPolygon = new MMapFeature({
          id: 'polygon',
          geometry: {
            type: 'Polygon',
            coordinates: [boundsToPolygonCoordinates(LITTLE_RESTRICT_AREA)]
          },
          style: {
            stroke: [{width: 12, color: '#007afce6'}],
            fill: 'rgba(0, 0, 0, 0)'
          }
        });
        map.addChild(borderPolygon);

        // Add a container for MMapControlButton and add it to the map
        const controls = new MMapControls({position: 'bottom'});
        map.addChild(controls);

        // Flag to increase/decrease the restricted area on the map
        let isBigRestrictArea = false;

        function changeViewFieldBtnHandler() {
          isBigRestrictArea = !isBigRestrictArea;

          // The selection of the restricted area and other map parameters depends on the flag's value
          const currentRestrictArea = isBigRestrictArea ? BIG_RESTRICT_AREA : LITTLE_RESTRICT_AREA;
          const currentZoomRange = isBigRestrictArea ? BIG_ZOOM_RANGE : LITTLE_ZOOM_RANGE;
          const currentBtnText = isBigRestrictArea ? 'Decrease The Field Of View' : 'Increase The Field Of View';

          // Update the map with the current restricted area and zoom range
          map.update({
            restrictMapArea: currentRestrictArea,
            zoomRange: currentZoomRange
          });
          // Update the map location bounds with the current restricted area
          map.update({location: {bounds: currentRestrictArea}});

          // Update the border polygon coordinates depending on the current restricted area
          borderPolygon.update({
            geometry: {
              type: 'Polygon',
              coordinates: [boundsToPolygonCoordinates(currentRestrictArea)]
            }
          });

          changeViewFieldBtn.update({text: currentBtnText});
        }

        // Add MMapControlButton that changes the restricted area
        const changeViewFieldBtn = new MMapControlButton({
          text: 'Increase The Field Of View',
          color: '#fff',
          background: '#007afce6',
          onClick: changeViewFieldBtnHandler
        });
        controls.addChild(changeViewFieldBtn);
      }
    </script>

    <!-- prettier-ignore -->
    <style> html, body, #app { width: 100%; height: 100%; margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } .toolbar { position: absolute; z-index: 1000; top: 0; left: 0; display: flex; align-items: center; padding: 16px; } .toolbar a { padding: 16px; }  </style>
  </head>
  <body>
    <div id="app"></div>
  </body>
</html>

import type {ZoomRange, LngLatBounds, LngLat} from '@mappable-world/mappable-types';

export const LITTLE_ZOOM_RANGE: ZoomRange = {min: 14, max: 20};
export const BIG_ZOOM_RANGE: ZoomRange = {min: 7, max: 14};

// Bounding box - bottom left and top right corners
export const LITTLE_RESTRICT_AREA: LngLatBounds = [
  [55.34271, 25.19559],
  [55.54271, 25.29559]
];
export const BIG_RESTRICT_AREA: LngLatBounds = [
  [44.11771, 16.51259],
  [66.09971, 33.94659]
];

// From the coordinates of bottom left and top right corners, we make 4 coordinates of the rectangle
export function boundsToPolygonCoordinates(bounds: LngLatBounds): LngLat[] {
  return [bounds[0], [bounds[1][0], bounds[0][1]], bounds[1], [bounds[0][0], bounds[1][1]]];
}

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
    <script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script>
    <!-- To make the map appear, you must add your apikey -->
    <script src="https://js.api.mappable.world/v3/?apikey=<YOUR_APIKEY>&lang=en_US" type="text/javascript"></script>

    <script
      data-plugins="transform-modules-umd"
      data-presets="react, typescript"
      type="text/babel"
      src="./common.ts"
    ></script>
    <script data-plugins="transform-modules-umd" data-presets="react, typescript" type="text/babel">
      import {
        BIG_RESTRICT_AREA,
        LITTLE_RESTRICT_AREA,
        BIG_ZOOM_RANGE,
        LITTLE_ZOOM_RANGE,
        boundsToPolygonCoordinates
      } from './common';

      window.map = null;

      main();
      async function main() {
        // For each object in the JS API, there is a React counterpart
        // To use the React version of the API, include the module @mappable-world/mappable-reactify
        const [mappableReact] = await Promise.all([
          mappable.import('@mappable-world/mappable-reactify'),
          mappable.ready
        ]);
        const reactify = mappableReact.reactify.bindTo(React, ReactDOM);
        const {MMap, MMapDefaultSchemeLayer, MMapDefaultFeaturesLayer, MMapFeature, MMapControls, MMapControlButton} =
          reactify.module(mappable);
        const {useState, useCallback} = React;

        function App() {
          // Flag to increase/decrease the restricted area on the map
          const [isBigRestrictArea, setIsBigRestrictArea] = useState(false);

          // Define states for map parameters
          const [restrictArea, setRestrictArea] = useState(LITTLE_RESTRICT_AREA);
          const [zoomRange, setZoomRange] = useState(LITTLE_ZOOM_RANGE);
          const [btnText, setBtnText] = useState('Increase The Field Of View');

          const changeViewFieldBtnHandler = useCallback(() => {
            const syncIsBigRestrictArea = !isBigRestrictArea;
            setIsBigRestrictArea((prevState) => !prevState);

            // The selection of the restricted area and other map parameters depends on the flag's value
            const currentRestrictArea = syncIsBigRestrictArea ? BIG_RESTRICT_AREA : LITTLE_RESTRICT_AREA;
            const currentZoomRange = syncIsBigRestrictArea ? BIG_ZOOM_RANGE : LITTLE_ZOOM_RANGE;
            const currentBtnText = syncIsBigRestrictArea ? 'Reduce The Field Of View' : 'Increase The Field Of View';

            // Update the map states with the current restricted area
            setRestrictArea(currentRestrictArea);
            setZoomRange(currentZoomRange);
            setBtnText(currentBtnText);
          }, [isBigRestrictArea]);

          return (
            // Initialize the map and pass initialization parameters, set the map location bounds with the current restricted area
            <MMap
              location={{bounds: restrictArea}}
              restrictMapArea={restrictArea}
              zoomRange={zoomRange}
              ref={(x) => (map = x)}
            >
              {/* Add a map schema layer and a geo objects layer */}
              <MMapDefaultSchemeLayer />
              <MMapDefaultFeaturesLayer />

              {/* Add a polygon to the map that will mark the border of the map restrict area */}
              <MMapFeature
                geometry={{
                  type: 'Polygon',
                  coordinates: [boundsToPolygonCoordinates(restrictArea)]
                }}
                style={{
                  stroke: [{width: 12, color: '#007afce6'}],
                  fill: 'rgba(0, 0, 0, 0)'
                }}
              />

              {/* Add MMapControlButton that changes the restricted area */}
              <MMapControls position="bottom">
                <MMapControlButton
                  text={btnText}
                  color="#fff"
                  background="#007afce6"
                  onClick={changeViewFieldBtnHandler}
                />
              </MMapControls>
            </MMap>
          );
        }

        ReactDOM.render(
          <React.StrictMode>
            <App />
          </React.StrictMode>,
          document.getElementById('app')
        );
      }
    </script>

    <!-- prettier-ignore -->
    <style> html, body, #app { width: 100%; height: 100%; margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } .toolbar { position: absolute; z-index: 1000; top: 0; left: 0; display: flex; align-items: center; padding: 16px; } .toolbar a { padding: 16px; }  </style>
  </head>
  <body>
    <div id="app"></div>
  </body>
</html>