Modify the camera's field of view | Mapbox GL JS

This example uses setVerticalFieldOfView() to adjust the map camera's vertical field of view, producing telephoto or wide-angle effects. Horizontal field of view is not independently controllable — it's derived from the vertical field of view and the Map's aspect ratio, and is available as a read-only value via getHorizontalFieldOfView().

JavaScript

React

JavaScript

React


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Modify the camera's field of view</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.30.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.30.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    .controls {
        position: absolute;
        top: 20px;
        left: 20px;
        background: rgba(255, 255, 255, 0.95);
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
            sans-serif;
        z-index: 1;
        min-width: 250px;
    }

    .controls h3 {
        margin: 0 0 15px 0;
        font-size: 16px;
        color: #333;
    }
    .controls span {
        min-width: 44px;
        display: inline-block;
    }

    .slider-group label {
        display: block;
        margin-bottom: 5px;
        font-size: 14px;
        color: #555;
    }

    .slider-group input[type='range'] {
        width: 100%;
        cursor: pointer;
    }

    .value {
        font-weight: bold;
        color: #0066cc;
    }
</style>
<div class="controls">
    <div class="slider-group">
        <input type="range" id="fov-slider" min="1" max="60" step="0.1" value="36.87">
        <label><strong>Vertical Field of View:</strong>
            <span id="v-fov-value" class="value">36.87</span></label>
        <label><strong>Horizontal Field of View</strong> (derived):
            <span id="h-fov-value" class="value">64.01</span></label>
    </div>
</div>
<!-- Map -->
<div id="map"></div>
<script>
    const map = new mapboxgl.Map({
        // TO MAKE THE MAP APPEAR YOU MUST
        // ADD YOUR ACCESS TOKEN FROM
        // https://account.mapbox.com
        accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
        container: 'map',
        config: {
            basemap: {
                showPlaceLabels: false,
                showPointOfInterestLabels: false,
                showRoadLabels: false
            }
        },
        center: [-71.06288, 42.36834],
        zoom: 16.85,
        bearing: 141.6,
        pitch: 75.67
    });

    // FOV slider
    document.getElementById('fov-slider').addEventListener('input', (e) => {
        const fov = parseFloat(e.target.value);
        document.getElementById('v-fov-value').textContent = fov.toFixed(2);
        document.getElementById('h-fov-value').textContent = map
            .getHorizontalFieldOfView()
            .toFixed(2);
        map.setVerticalFieldOfView(fov);
    });
</script>

</body>
</html>

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

JavaScript

React


import React, { useEffect, useRef, useState } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';

import 'mapbox-gl/dist/mapbox-gl.css';

const MapboxExample = () => {
  const mapContainerRef = useRef();
  const mapRef = useRef();
  const [fov, setFov] = useState({ vertical: 36.87, horizontal: 64.01 });

  const labelStyles = {
    display: 'block',
    marginBottom: 5,
    fontSize: 14,
    color: '#555'
  };

  const spanStyles = {
    minWidth: 44,
    display: 'inline-block',
    fontWeight: 'bold',
    color: '#0066cc',
    marginLeft: 5
  };

  const handleFov = (e) => {
    mapRef.current.setVerticalFieldOfView(e.target.value);
    setFov({
      vertical: mapRef.current.getVerticalFieldOfView().toFixed(2),
      horizontal: mapRef.current.getHorizontalFieldOfView().toFixed(2)
    });
  };

  useEffect(() => {
    mapRef.current = new mapboxgl.Map({
      // TO MAKE THE MAP APPEAR YOU MUST
      // ADD YOUR ACCESS TOKEN FROM
      // https://account.mapbox.com
      accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
      container: mapContainerRef.current,
      config: {
        basemap: {
          showPlaceLabels: false,
          showPointOfInterestLabels: false,
          showRoadLabels: false
        }
      },
      center: [-71.06288, 42.36834],
      zoom: 16.85,
      bearing: 141.6,
      pitch: 75.67
    });
  }, []);

  return (
    <>
      <div
        className="controls"
        style={{
          position: 'absolute',
          top: 20,
          left: 20,
          background: 'rgba(255, 255, 255, 0.95)',
          padding: 20,
          borderRadius: 8,
          boxShadow: '0 2 10 rgba(0,0,0,0.2)',
          fontFamily:
            "-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif",
          zIndex: 1,
          minWidth: 250
        }}
      >
        <div>
          <input
            type="range"
            style={{ width: '100%', cursor: 'pointer', display: 'block' }}
            id="fov-slider"
            min="1"
            max="60"
            step="0.1"
            value={fov.vertical}
            onChange={handleFov}
          />
          <div style={labelStyles}>
            <strong>Vertical Field of View:</strong>
            <span id="v-fov-value" style={spanStyles}>
              {fov.vertical}
            </span>
          </div>
          <div style={labelStyles}>
            <strong>Horizontal Field of View</strong> (derived):
            <span id="h-fov-value" style={spanStyles}>
              {fov.horizontal}
            </span>
          </div>
        </div>
      </div>
      <div ref={mapContainerRef} id="map" style={{ height: '100%' }}></div>
    </>
  );
};

export default MapboxExample;

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

このexampleは役に立ちましたか？