Google Maps API 3

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CHAPTER 8 ■ CREATING POLYLINES AND POLYGONS // Creating the Polyline object var polyline = new google.maps.Polyline({ path: route, strokeColor: "#ff0000", strokeOpacity: 0.6, strokeWeight: 5 }); // Adding the polyline to the map polyline.setMap(map); With this code, the polyline is in place and is attached to the map. But since the MVCArray doesn’t yet contain any points, the polyline will not be visible. What you need to do now is to create a click event and attach it to the map. The click event returns an object of type google.maps.MouseEvent, which contains a property called latLng, which contains a google.maps.LatLng object that represents the position clicked. In other words, the click returns the position in the map that’s being clicked, and you can use that information to create a point for the polyline. First you attach a click event to the map object using the addListener() method of the google.maps.event object. You will pass three arguments to it; the first one is the map, and the second one is the type of event you want to catch, in this case the click event. The last argument is an anonymous function that will execute when the event is being triggered. You will pass a reference to the event (e) to this function. It is that reference that is the MouseEvent object. // Adding a click event to the map object google.maps.event.addListener(map, 'click', function(e) { // Code that will be executed once the event is triggered }); Now you have the event listener in place. The next step is to actually do something when it’s being triggered. So, you need to get a reference to the MVCArray. This is done by calling the getPath() method of the polyline. Once you have that reference, you can call its methods. The method you want to use is the push() method, which inserts a new item in the end of the array. You pass the LatLng object as an argument to this method, and once that’s done, a new point is added to the polyline. // Adding a click event to the map object google.maps.event.addListener(map, 'click', function(e) { }); // Getting the MVCArray var path = polyline.getPath(); // Adding the position clicked which is in fact // a google.maps.LatLng object to the MVCArray path.push(e.latLng); There! Everything is in place, and you now have a dynamic polyline (Figure 8-5). Each click in the map will extend the polyline to the point being clicked. Since a polyline must contain at least two points to show, it will not be visible until after the second click in the map. 164
CHAPTER 8 ■ CREATING POLYLINES AND POLYGONS Figure 8-5. A dynamic polyline. Each click in the map adds a point to it. The Complete Code Listing 8-3 shows the complete code for this example: Listing 8-3. The Complete JavaScript Code for Example 8-2 (function() { window.onload = function(){ // Creating a map var options = { zoom: 5, center: new google.maps.LatLng(36.1834, -117.4960), mapTypeId: google.maps.MapTypeId.ROADMAP }; var map = new google.maps.Map(document.getElementById('map'), options); // Creating an empty MVCArray var route = new google.maps.MVCArray(); // Creating the Polyline object var polyline = new google.maps.Polyline({ path: route, strokeColor: "#ff0000", strokeOpacity: 0.6, strokeWeight: 5 165
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THE EXPERT’S VOICE ® IN WEB DEVE
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Beginning Google Maps API 3 Copyrig
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Contents at a Glance Contents......
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■ CONTENTS Creating a Map .......
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■ CONTENTS Automatically Adjustin
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■ CONTENTS ■ Chapter 8: Creatin
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■ CONTENTS MapCanvasProjection Ob
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About the Technical Reviewer ■ Ro
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Introduction This book started out
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CHAPTER 1 ■ INTRODUCING THE GOOGL
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CHAPTER 2 ■ TRANSFERRING FROM VER
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C H A P T E R 3 ■ ■ ■ Creatin
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CHAPTER 3 ■ CREATING YOUR FIRST M
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CHAPTER 4 ■ TAKING THE MAP FURTHE
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CHAPTER 5 ■ X MARKS THE SPOT Figu
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CHAPTER 5 ■ X MARKS THE SPOT List
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CHAPTER 5 ■ X MARKS THE SPOT }; }
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CHAPTER 5 ■ X MARKS THE SPOT }; }
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CHAPTER 6 ■ MARKER ICONS Changing
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CHAPTER 6 ■ MARKER ICONS Figure 6
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CHAPTER 6 ■ MARKER ICONS ■ Note
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CHAPTER 6 ■ MARKER ICONS Figure 6
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CHAPTER 6 ■ MARKER ICONS Using Sp
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CHAPTER 6 ■ MARKER ICONS Origin t
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CHAPTER 10 ■ LOCATION, LOCATION,
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APPENDIX ■ API REFERENCE The Name
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APPENDIX ■ API REFERENCE Method R
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APPENDIX ■ API REFERENCE MapOptio
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APPENDIX ■ API REFERENCE Constant
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APPENDIX ■ API REFERENCE ScaleCon
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APPENDIX ■ API REFERENCE MapPanes
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APPENDIX ■ API REFERENCE Table A-
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APPENDIX ■ API REFERENCE Event Ar
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APPENDIX ■ API REFERENCE Property
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APPENDIX ■ API REFERENCE Geocoder
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APPENDIX ■ API REFERENCE LatLng C
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APPENDIX ■ API REFERENCE Method R
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APPENDIX ■ API REFERENCE MVCObjec
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• • • Index •A addDomListen
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•INDEX latency, 111 limits on dow
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•INDEX prime meridian, 4 x proper
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•INDEX addListener() see addListe
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•INDEX building address lookup we
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•INDEX handleError function build
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•INDEX size of, 137 v2/v3 compare
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•INDEX creating zoom-in link in I
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•INDEX adding rich content to Inf
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•INDEX maxZoom property, 209 mini
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•INDEX Map object, 247 Marker cla
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•INDEX creating donuts, 170 fillC
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•INDEX MapTypeId class, 51, 52, 2
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•INDEX src attribute, video eleme
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•INDEX streetViewControl, 59—61
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Google Maps API 3

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