The initial zoom level on Google Maps does not adjust when using the fitBounds method for polyline

Question

The initial zoom level on Google Maps does not adjust when using the fitBounds method for polyline

I am currently utilizing the fitbound function to automatically zoom in on a polyline displayed on a map. However, I have noticed that on the initial attempt, it does not work as expected. But if I make changes to the chartData and then call the same function again, it works perfectly fine. Here is the code snippet for the function:

var mapOptions = {
                    zoom: 1,
                    center: { lat: 0, lng: 0 },
                    zoomControl: true,
                    zoomControlOptions: {
                        style: google.maps.ZoomControlStyle.SMALL
                    },
                    mapTypeId: 'satellite'
                };
                this.chart = new google.maps.Map(document.getElementById(chart_element.id), mapOptions);
                let polylinePath = new google.maps.Polyline({
                    path: chart_data,
                    geodesic: true,
                    strokeColor: '#FF0000',
                    strokeOpacity: 1.0,
                    strokeWeight: 2
                });

                /* set auto zoom level to polyline */

                var latlngbounds = new google.maps.LatLngBounds();
                for (var i = 0; i < this.chartData.length; i++) {
                    latlngbounds.extend(this.chartData[i]);
                }

                this.chart.fitBounds(latlngbounds);

                /* Set polyline chart to map */
                polylinePath.setMap(this.chart);

https://i.sstatic.net/0dITS.png

javascript google-maps

Answer 1

Answer №1

// Adjust the zoom level
var zoomListener = google.maps.event.addListener((map), 'zoom_changed', function(event) {
    this.setZoom(11);
    google.maps.event.removeListener(zoomListener);
});

Answer 2

// Adjust the zoom level
var zoomListener = google.maps.event.addListener((map), 'zoom_changed', function(event) {
    this.setZoom(11);
    google.maps.event.removeListener(zoomListener);
});

Answer 3

Answer №2

To enhance the functionality of google.maps.Polyline, consider adding a new prototype method called getBounds(). This method will allow you to scale the Map based on the boundaries of the Polyline's LatLngBounds. Simply set the map and then fit it to the bounds using the following code:

polyline.setMap(map);
map.fitBounds(polyline.getBounds());

Furthermore, there seems to be inconsistency in the naming convention within your code. The variable for the path is referred to as both chart_data and this.chartData.

var map;
var timeout;
var coordinates = [
  {lat: 37.772, lng: -122.214},
  {lat: 21.291, lng: -157.821},
  {lat: -18.142, lng: 178.431},
  {lat: -27.467, lng: 153.027}
];

var polyline = new google.maps.Polyline({
  path: coordinates,
  geodesic: true,
  strokeColor: '#FFD034',
  strokeOpacity: 1.0,
  strokeWeight: 2
});

var mapOptions = {
  mapTypeId: 'satellite',
  zoom: 20,
  zoomControl: true,
  zoomControlOptions: {
    style: google.maps.ZoomControlStyle.SMALL
  }
};

google.maps.Polyline.prototype.getBounds = function() {
  var bounds = new google.maps.LatLngBounds();
  this.getPath().forEach(function(e) {bounds.extend(e);});
  return bounds;
};

function onLoad() {

  /* creating the map and plotting the polyline */
  map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);  
  polyline.setMap(map);
  
  /* initially fitting the map to bounds */
  map.fitBounds(polyline.getBounds());
  
  /* subsequent events, which fit the map to bounds (may prevent manual zoom). */
  google.maps.event.addListener(map, 'bounds_changed',
    function() {
      window.clearTimeout(timeout);
      timeout = window.setTimeout(function () {
        map.fitBounds(polyline.getBounds());
      }, 500);
    }
  );
}
google.maps.event.addDomListener(window, "load", onLoad);

html, body, #map_canvas {height: 100%; width: 100%; margin: 0px; padding: 0px;}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map_canvas"></div>

Answer 4

To enhance the functionality of google.maps.Polyline, consider adding a new prototype method called getBounds(). This method will allow you to scale the Map based on the boundaries of the Polyline's LatLngBounds. Simply set the map and then fit it to the bounds using the following code:

polyline.setMap(map);
map.fitBounds(polyline.getBounds());

Furthermore, there seems to be inconsistency in the naming convention within your code. The variable for the path is referred to as both chart_data and this.chartData.

var map;
var timeout;
var coordinates = [
  {lat: 37.772, lng: -122.214},
  {lat: 21.291, lng: -157.821},
  {lat: -18.142, lng: 178.431},
  {lat: -27.467, lng: 153.027}
];

var polyline = new google.maps.Polyline({
  path: coordinates,
  geodesic: true,
  strokeColor: '#FFD034',
  strokeOpacity: 1.0,
  strokeWeight: 2
});

var mapOptions = {
  mapTypeId: 'satellite',
  zoom: 20,
  zoomControl: true,
  zoomControlOptions: {
    style: google.maps.ZoomControlStyle.SMALL
  }
};

google.maps.Polyline.prototype.getBounds = function() {
  var bounds = new google.maps.LatLngBounds();
  this.getPath().forEach(function(e) {bounds.extend(e);});
  return bounds;
};

function onLoad() {

  /* creating the map and plotting the polyline */
  map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);  
  polyline.setMap(map);
  
  /* initially fitting the map to bounds */
  map.fitBounds(polyline.getBounds());
  
  /* subsequent events, which fit the map to bounds (may prevent manual zoom). */
  google.maps.event.addListener(map, 'bounds_changed',
    function() {
      window.clearTimeout(timeout);
      timeout = window.setTimeout(function () {
        map.fitBounds(polyline.getBounds());
      }, 500);
    }
  );
}
google.maps.event.addDomListener(window, "load", onLoad);

html, body, #map_canvas {height: 100%; width: 100%; margin: 0px; padding: 0px;}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map_canvas"></div>

The initial zoom level on Google Maps does not adjust when using the fitBounds method for polyline

Answer №1

Answer №2

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