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ftsetWidget(0, ftsetWidget(0, ftsetWidget(1, ftsetWidget(1, vpadd(div); vpadd(ft); initWidget(vp); }
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new Label("Latitude:")); lat); new Label("Longitude:")); lon);
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The getLatitude(), getLongitude() and setCoordinates() methods are quite simple, and mainly access the corresponding TextBox fields
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@Override public final double getLatitude() { return DoubleparseDouble(latgetValue()); } @Override public final double getLongitude() { return DoubleparseDouble(longetValue()); } @Override public final void setCoordinates( final double latitude, final double longitude) { latsetValue("" + latitude); lonsetValue("" + longitude); }
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Now, how and when should we initialize the map We are just defining a Composite widget here, and it won t get displayed until later, so we cannot do any Maps API calls right now Because we need the map to be initialized as soon as the form is shown, an easy way to achieve this is by redefining the onAttach() method, and our initialization code will be called the moment the widget is shown11
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@Override public final void onAttach() { superonAttach(); yahooMapInit(); setCoordinates(AMNHlat, AMNHlon); yahooMapDisplay(AMNHlat, AMNHlon, AMNHDescription); } 11 The onLoad() method could also be used
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The most interesting parts come now Initialization requires calling the YMap function to produce a map, setting its type to whatever we want (we are going for a regular map; other options include satellite and hybrid versions), and saving it to the yahooMap attribute we defined earlier Note the usage of the usual JSNI $wnd prefix, and the rather long way for accessing yahooMap You could get fancier and add several types of controls if you want; check the API documentation for that
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private final native void yahooMapInit() /*-{ var map = new $wndYMap($docgetElementById('myveryownmap')); mapsetMapType($wndYAHOO_MAP_REG); this@comfkerekimvpprojectclientmap1MapView::yahooMap= map; // // You can add controls: // // mapaddTypeControl(); // mapaddPanControl(); // mapaddZoomLong(); // mapaddZoomShort(); // }-*/ ;
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Displaying the map at a given coordinate requires creating a YGeoPoint object and using the drawZoomAndCenter() method (Notice, once again, that we need a myself variable because of closure matters in the moveMarker() method; see the following code) After, we can add a marker at the center point of the map, give it an auto expand text and show it Finally, we must capture clicks on the map to reposition the marker; the moveMarker() method achieves that: The second parameter stands for the coordinates of the clicked point Then, we can reset the marker coordinates with setYGeoPoint() and pan the view so the map will be centered by using panToLatLon() Finally, we can call the Java setCoordinates() method so the updated coordinates will be shown onscreen
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private final native void yahooMapDisplay( final double lat, final double lon, final String text) /*-{ var myself= this; var map= myself@comfkerekimvpprojectclientmap1MapView::yahooMap; var currentGeoPoint = new $wndYGeoPoint(lat, lon); mapdrawZoomAndCenter(currentGeoPoint, 3); mapaddMarker(currentGeoPoint,"myveryownmarker"); mapgetMarkerObject("myveryownmarker")addAutoExpand(text);
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mapgetMarkerObject("myveryownmarker")openAutoExpand(); $wndYEventCapture(map, $wndEventsListMouseUp, moveMarker); function moveMarker(_e, _c) { mapgetMarkerObject("myveryownmarker")setYGeoPoint(_c); mappanToLatLon(_c); myself@comfkerekimvpprojectclientmap1MapView:: setCoordinates(DD)(_cLat, _cLon); } // // If needed, you could get the current marker coordinates by writing: // // var myobj= mapgetMarkerObject("myveryownmarker"); // alert("Coords: "+myobjYGeoPointLat+", "+myobjYGeoPointLon); // }-*/ ; }
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I have used similar logic for applications that worked with geographical data, so the data entry personnel could check whether a store was correctly positioned, and of course, reposition it if needed You can also use other functions that let you search for a place by giving, say, its street address; check on that for extra flexibility
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If you don t need interactive maps and can do with just a image file, Yahoo! Maps also provides a REST API (see http://developeryahoocom/maps/rest/V1/) that you can use in a two-step process to get an image built by Yahoo! s servers First, you need to call a service (at http://localyahooapiscom/MapsService/V1/ mapImage) whose answer will be an XML file with a URL in it; you can then assign the URL to an <image> object, and the generated map will be displayed; let s do it first by hand, and then with GWT code For example, say we want to get an image of the map around the American Museum of Natural History, as in the previous section We must first connect to http://localyahooapiscom/MapsService/V1/mapImage appid= yourKeyGoesHere&latitude=40780411&longitude=-73974037 and the returned value will be something like the following (slightly abridged and edited) XML string
< xml version="10" > <Result xmlns:xsi="http://wwww3org/2001/XMLSchema-instance"> http://gwsmapsyahoocom/mapimage MAPDATA=encodedMapDataGoesHere &mvt=m&cltype=onnetwork&intl=us&appid=yourKeyGoesHere &oper=&_proxy=ydn,xml</Result> <!-- ws11ydnac4yahoocom compressed/chunked Mon Jan 18 15:05:10 PST 2010 -->