CustomMapTypeDemo.java

/*
 * 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.Copyright;
import com.google.gwt.maps.client.CopyrightCollection;
import com.google.gwt.maps.client.MapType;
import com.google.gwt.maps.client.MapWidget;
import com.google.gwt.maps.client.TileLayer;
import com.google.gwt.maps.client.control.MapTypeControl;
import com.google.gwt.maps.client.geom.LatLng;
import com.google.gwt.maps.client.geom.LatLngBounds;
import com.google.gwt.maps.client.geom.MercatorProjection;
import com.google.gwt.maps.client.geom.Point;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * To create an info window, call the openInfoWindow method, passing it a
 * location and a DOM element to display. The following example code displays an
 * info window anchored to the center of the map with a simple "Hello, world"
 * message.
 */
public class CustomMapTypeDemo extends MapsDemo {

  private static HTML descHTML = null;
  private static final String descString = "<h2>Custom MapType Demo</h2>\n"
      + "<p>Tests the MapType and TileLayer APIs</p>"
      + "<p>You should see a <i>MyMap</i> button on the upper right of "
      + "the map that shows crosses on a grey background when pressed. "
      + "</p>";

  public static MapsDemoInfo init() {
    return new MapsDemoInfo() {

      @Override
      public MapsDemo createInstance() {
        return new CustomMapTypeDemo();
      }

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

      @Override
      public String getName() {
        return "Creating a custom MapType";
      }
    };
  }

  private MapWidget map;

  public CustomMapTypeDemo() {

    VerticalPanel vertPanel = new VerticalPanel();
    vertPanel.setStyleName("hm-panel");

    map = new MapWidget(LatLng.newInstance(33.7814790, -84.3880580), 13);
    map.setSize("500px", "450px");

    CopyrightCollection myCopyright = new CopyrightCollection("");
    myCopyright.addCopyright(new Copyright(1, LatLngBounds.newInstance(LatLng.newInstance(34,
        -81), LatLng.newInstance(36, -79)), 10, ""));
    TileLayer tileLayer = new TileLayer(myCopyright, 10, 18) {
      @Override
      public double getOpacity() {
        return 1.0;
      }

      @Override
      public String getTileURL(Point tile, int zoomLevel) {
        return "http://www.google.com/apis/maps/documentation/examples/include/tile_crosshairs.png";
      }

      @Override
      public boolean isPng() {
        return true;
      }
    };

    MapType mapType = new MapType(new TileLayer[] {tileLayer},
        new MercatorProjection(20), "MyMap");
    map.addMapType(mapType);
    map.addControl(new MapTypeControl());

    vertPanel.add(map);

    initWidget(vertPanel);
  }
}