基于flex天地图技术总结.doc

基于flex天地图技术总结 ArcGIS Flex API 调用天地图和Google地图服务 Esri为我们提供了TiledMapServiceLayer类，这个类正是所有瓦片地图服务都必须继承的类，像ArcGISTiledMapServiceLayer, OpenStreetMapLayer, VETiledLayer等esri提供的瓦片类都是继承了该类的，所以我们要扩展该TiledMapServiceLayer类 一.调用天地图服务（SXGeoTileLayer类） [plain] 1. import com.esri.ags.SpatialReference; 2. import com.esri.ags.geometry.Extent; 3. import com.esri.ags.geometry.MapPoint; 4. import com.esri.ags.layers.supportClasses.LOD; 5. import com.esri.ags.layers.supportClasses.TileInfo; 6. import com.esri.ags.layers.TiledMapServiceLayer; 7. import com.esri.ags.layers.TiledMapServiceLayer; 8. 9. import flash.geom.Point; 10. import .URLRequest; 11. 12. /** 13. * SXGeoTileLayer 14. */ 15. public class SXGeoTileLayer extends TiledMapServiceLayer 16. { 17. //-------------------------------------------------------------------------- 18. // 19. // Constructor 20. // 21. //-------------------------------------------------------------------------- 22. 23. /** 24.* Creates a new PortlandTiledMapServiceLayer object. 25.*/ 26. public function SXGeoTileLayer() 27. { 28.super(); 29. 30.buildTileInfo(); // to create our hardcoded tileInfo 31. 32.setLoaded(true); // Map will only use loaded layers 33. } 34. 35. //-------------------------------------------------------------------------- 36. // 37. // Variables 38. // 39. //-------------------------------------------------------------------------- 40. 41. private var wkid:int = 4326; 42. private var _tileInfo:TileInfo = new TileInfo(); // see buildTileInfo() 43. private var _url:String = new String(); 44. //private var _wmsLayer:String = new String(); 45. 46. //-------------------------------------------------------------------------- 47. // 48. // Overridden properties 49. //fullExtent() 50. //initialExtent() 51. //spatialReference() 52. //tileInfo() 53. //units() 54. // 55. //-------------------------------------------------------------------------- 56.