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Sunday, February 19, 2017

Google Maps - Shapes

In the previous chapter, we learned how to use markers in Google Maps. Along with markers, we can also add various shapes such as circles, polygons, rectangles, polylines, etc. This chapter explains how to use the shapes provided by Google Maps.

Polylines

Polylines, provided by Google Maps, are useful to track different paths. You can add polylines to a map by instantiating the class google.maps.Polyline. While instantiating this class, we have to specify the required values of the properties of a polyline such as StrokeColor, StokeOpacity, and strokeWeight.
We can add a polyline to a map by passing its object to the method setMap(MapObject). We can delete the polyline by passing a null value to the SetMap() method.

Example

The following example shows a polyline highlighting the path between the cities Delhi, London, New York, and Beijing.
<!DOCTYPE html>
<html>
   
   <head>
      <script src = "https://maps.googleapis.com/maps/api/js"></script>
      
      <script>
         function loadMap(){
   
            var mapProp = {
               center:new google.maps.LatLng(51.508742,-0.120850),
               zoom:3,
               mapTypeId:google.maps.MapTypeId.ROADMAP
            };
            
            var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
            
            var tourplan = new google.maps.Polyline({
               path:[
                  new google.maps.LatLng(28.613939, 77.209021),
                  new google.maps.LatLng(51.507351, -0.127758),
                  new google.maps.LatLng(40.712784, -74.005941),
                  new google.maps.LatLng(28.213545, 94.868713) 
               ],
               
               strokeColor:"#0000FF",
               strokeOpacity:0.6,
               strokeWeight:2
            });
            
            tourplan.setMap(map);
            //to remove plylines
            //tourplan.setmap(null);
         }
      </script>
      
   </head>
   
   <body onload = "loadMap()">
      <div id = "googleMap" style = "width:580px; height:400px;"></div>
   </body>
   
</html>
It will produce the following output −

Polygons

Polygons are used to highlight a particular geographical area of a state or a country. You can create a desired polygon by instantiating the class google.maps.Polygon. While instantiating, we have to specify the desired values to the properties of Polygon such as path, strokeColor, strokeOapacity, fillColor, fillOapacity, etc.

Example

The following example shows how to draw a polygon to highlight the cities Hyderabad, Nagpur, and Aurangabad.
<!DOCTYPE html>
<html>
   
   <head>
      <script src = "https://maps.googleapis.com/maps/api/js"></script>
      
      <script>
         function loadMap(){
   
            var mapProp = {
               center:new google.maps.LatLng(17.433053, 78.412172),
               zoom:4,
               mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            
            var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
            
            var myTrip = [
               new google.maps.LatLng(17.385044, 78.486671),
               new google.maps.LatLng(19.696888, 75.322451), 
               new google.maps.LatLng(21.056296, 79.057803), 
               new google.maps.LatLng(17.385044, 78.486671)
            ];
            
            var flightPath = new google.maps.Polygon({
               path:myTrip,
               strokeColor:"#0000FF",
               strokeOpacity:0.8,
               strokeWeight:2,
               fillColor:"#0000FF",
               fillOpacity:0.4
            });
            
            flightPath.setMap(map);
         }
      </script>
      
   </head>
   
   <body onload = "loadMap()">
      <div id = "googleMap" style = "width:580px; height:400px;"></div>
   </body>
   
</html>
It will produce the following output −

Rectangles

We can use rectangles to highlight the geographical area of a particular region or a state using a rectangular box. We can have a rectangle on a map by instantiating the class google.maps.Rectangle. While instantiating, we have to specify the desired values to the properties of the rectangle such as path, strokeColor, strokeOapacity, fillColor, fillOapacity, strokeWeight, bounds, etc.

Example

The following example shows how to highlight a particular area on a map using a rectangle −
<!DOCTYPE html>
<html>
   
   <head>
      <script src = "https://maps.googleapis.com/maps/api/js"></script>
      
      <script>
         function loadMap(){
   
            var mapProp = {
               center:new google.maps.LatLng(17.433053, 78.412172),
               zoom:6,
               mapTypeId:google.maps.MapTypeId.ROADMAP
            };
            
            var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
            
            var myrectangle = new google.maps.Rectangle({
               strokeColor:"#0000FF",
               strokeOpacity:0.6,
               strokeWeight:2,
               
               fillColor:"#0000FF",
               fillOpacity:0.4,
               map:map,
               
               bounds:new google.maps.LatLngBounds(
                  new google.maps.LatLng(17.342761, 78.552432),
                  new google.maps.LatLng(16.396553, 80.727725)
               )
     
            });
         }
      </script>
      
   </head>
   
   <body onload = "loadMap()">
      <div id = "googleMap" style = "width:580px; height:400px;"></div>
   </body>
</html>
This gives you the following output −

Circles

Just as rectangles, we can use Circles to highlight the geographical area of a particular region or a state using a circle by instantiating the class google.maps.Circle. While instantiating, we have to specify the desired values to the properties of the circle such as path, strokeColor, strokeOapacity, fillColor, fillOapacity, strokeWeight, radius, etc.

Example

The following example shows how to highlight the area around New Delhi using a circle −
<!DOCTYPE html>
<html>
   
   <head>
      <script src = "https://maps.googleapis.com/maps/api/js"></script>
      
      <script>
         function loadMap(){
   
            var mapProp = {
               center:new google.maps.LatLng(28.613939,77.209021),
               zoom:5,
               mapTypeId:google.maps.MapTypeId.ROADMAP
            };
         
            var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
         
            var myCity = new google.maps.Circle({
               center:new google.maps.LatLng(28.613939,77.209021),
               radius:150600,
            
               strokeColor:"#B40404",
               strokeOpacity:0.6,
               strokeWeight:2,
            
               fillColor:"#B40404",
               fillOpacity:0.6
            });
    
            myCity.setMap(map);
         }
      </script>
      
   </head>
   
   <body onload = "loadMap()">
      <div id = "googleMap" style = "width:580px; height:400px;"></div>
   </body>
   
</html>
It will produce the following output −
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