com.google.gwt.maps.sample.hellomaps.client.IconClassDemo.java Source code

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Here is the source code for com.google.gwt.maps.sample.hellomaps.client.IconClassDemo.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.maps.sample.hellomaps.client;

import com.google.gwt.maps.client.InfoWindow;
import com.google.gwt.maps.client.InfoWindowContent;
import com.google.gwt.maps.client.MapWidget;
import com.google.gwt.maps.client.control.MapTypeControl;
import com.google.gwt.maps.client.control.SmallMapControl;
import com.google.gwt.maps.client.event.MarkerClickHandler;
import com.google.gwt.maps.client.geom.LatLng;
import com.google.gwt.maps.client.geom.LatLngBounds;
import com.google.gwt.maps.client.geom.Point;
import com.google.gwt.maps.client.geom.Size;
import com.google.gwt.maps.client.overlay.Icon;
import com.google.gwt.maps.client.overlay.Marker;
import com.google.gwt.maps.client.overlay.MarkerOptions;
import com.google.gwt.user.client.ui.HTML;

/**
 * In many cases, your icons may have different foregrounds, but the same shape
 * and shadow. The easiest way to achieve this behavior is to use the copy
 * constructor for the =GIcon= class, which copies all the properties over to a
 * new icon which you can then customize.
 */
public class IconClassDemo extends MapsDemo {

    private static HTML descHTML = null;

    private static final String descString = "<p>Creates a map view of the " + "centered on Palo Alto, CA USA</p>"
            + "<p>A number of markers are created that share the same shadow, but have "
            + "different foreground images (letters)</p>\n" + "<p>Equivalent to the Maps JavaScript API Example: "
            + "<a http://code.google.com/apis/maps/documentation/examples/icon-custom.html\">"
            + "http://code.google.com/apis/maps/documentation/examples/icon-custom.html</a></p>\n";

    public static MapsDemoInfo init() {
        return new MapsDemoInfo() {
            @Override
            public MapsDemo createInstance() {
                return new IconClassDemo();
            }

            @Override
            public HTML getDescriptionHTML() {
                if (descHTML == null) {
                    descHTML = new HTML(descString);
                }
                return descHTML;
            }

            @Override
            public String getName() {
                return "Using Icon Classes";
            }
        };
    }

    private MapWidget map;

    private Icon baseIcon;

    public IconClassDemo() {
        map = new MapWidget(LatLng.newInstance(37.4419, -122.1419), 13);
        map.setSize("500px", "300px");
        initWidget(map);

        map.addControl(new SmallMapControl());
        map.addControl(new MapTypeControl());

        // Create a base icon for all of our markers that specifies the
        // shadow, icon dimensions, etc.
        baseIcon = Icon.newInstance();
        baseIcon.setShadowURL("http://www.google.com/mapfiles/shadow50.png");
        baseIcon.setIconSize(Size.newInstance(20, 34));
        baseIcon.setShadowSize(Size.newInstance(37, 34));
        baseIcon.setIconAnchor(Point.newInstance(9, 34));
        baseIcon.setInfoWindowAnchor(Point.newInstance(9, 2));
        // TOOD(sgross): undocumented?
        // baseIcon.setInfoShadowAnchor(new GPoint(18, 25));
    }

    @Override
    public void onShow() {
        map.clearOverlays();

        // Add 10 markers to the map at random locations
        LatLngBounds bounds = map.getBounds();
        LatLng southWest = bounds.getSouthWest();
        LatLng northEast = bounds.getNorthEast();
        double lngSpan = northEast.getLongitude() - southWest.getLongitude();
        double latSpan = northEast.getLatitude() - southWest.getLatitude();
        for (int i = 0; i < 10; i++) {
            LatLng point = LatLng.newInstance(southWest.getLatitude() + latSpan * Math.random(),
                    southWest.getLongitude() + lngSpan * Math.random());
            map.addOverlay(createMarker(point, i));
        }
    }

    /**
     * Creates a marker whose info window displays the letter corresponding to the
     * given index.
     */
    private Marker createMarker(LatLng point, int index) {
        // Create a lettered icon for this point using our icon class
        final char letter = (char) ('A' + index);
        Icon icon = Icon.newInstance(baseIcon);
        icon.setImageURL("http://www.google.com/mapfiles/marker" + letter + ".png");
        MarkerOptions options = MarkerOptions.newInstance();
        options.setIcon(icon);
        final Marker marker = new Marker(point, options);

        marker.addMarkerClickHandler(new MarkerClickHandler() {

            public void onClick(MarkerClickEvent event) {
                InfoWindow info = map.getInfoWindow();
                info.open(event.getSender(), new InfoWindowContent("Marker <b>" + letter + "</b>"));
            }

        });

        return marker;
    }
}