icons.cs

功能：基于windows mobile 的地图查看器。使用vs2005开发

using System;
using System.Collections.Generic;
using System.Text;

using System.Xml.Serialization;
using System.IO;
using System.Drawing;

using Microsoft.WindowsMobile.DirectX;
using Microsoft.WindowsMobile.DirectX.Direct3D;

using WorldWindow;

namespace cfWorldWind
{
	public class Icons
	{
		public Icons()
		{

		}

		public LayerSet GetLayerSetXs(string filePath)
		{
			XmlSerializer xs = new XmlSerializer(typeof(LayerSet));
			//string filePath = Settings.DirectoryLandmark + @"Landmark.xml";
			FileStream fs = new FileStream(filePath, FileMode.Open);
			LayerSet ls = (LayerSet)xs.Deserialize(fs);
			fs.Close();
			xs = null;
			return ls;
		}

		List<IconClass> alIcons;
		//Rectangle spriteSize = new Rectangle(0, 0, 128, 128);
		Sprite sprite;

		public class IconClass
		{
			public string name;
			public float lat;
			public float lon;
			public Vector3 point;
			public Texture texture;
			public string url;
		}

		public void InitializeVertex(Device device, string filePath)
		{
			LayerSet ls = GetLayerSetXs(filePath);
			InitializeVertex(device, ls);
		}

		public void InitializeVertex(Device device, LayerSet ls)
		{
			alIcons = new List<IconClass>();
			sprite = new Sprite(device);

			float heightAboveSurface = Settings.Radius + 100;

			//LayerSet ls = GetLayerSetXs(filePath);
			foreach (Icon icon in ls.Icon)
			{
				IconClass ic = new IconClass();
				ic.name = icon.Name;
				ic.lat = (float)icon.Latitude.Value;
				ic.lon = (float)icon.Longitude.Value;
				ic.url = icon.ClickableUrl;
				ic.point = MathEngine.SphericalToCartesian(ic.lat, ic.lon, heightAboveSurface);

				//make it easy for hit testing
				ic.lat = ic.lat + 90;
				ic.lon = ic.lon + 180;

				string path = Settings.StorageCard + icon.TextureFilePath.Replace("Add-ons", "Data");
				path = path.Replace("Flags Of The World", "FlagsOfTheWorld"); //lazy
				path = path.Replace(".png", "Small.png"); //size issue
				ic.texture = TextureLoader.FromFile(device, path, 0, 0, 1, 0, Format.Unknown, Pool.Managed, Filter.Box, Filter.Box, 0);
				alIcons.Add(ic);
			}
			ls.Icon = null;
			ls = null;
		}

		//TODO selection to spawn a URL?

		public void RenderVertex(Device device, Camera camera, Rectangle spriteSize)
		{
			float decViewRange = (float)MathEngine.RadiansToDegrees(camera.ViewRange) / 4f; //not quire 1/2
			float north = (camera.Latitude + 90) + decViewRange;
			float east = (camera.Longitude + 180) + decViewRange;
			float south = (camera.Latitude + 90) - decViewRange;
			float west = (camera.Longitude + 180) - decViewRange;

			float scaleWidth = .25f;
			float scaleHeight = .25f;
			uint iconWidth = 16;
			uint iconHeight = 8;

			foreach (IconClass ic in alIcons)
			{
				if (ic.lat <= north && ic.lat >= south && ic.lon <= east && ic.lon >= west)
				{
					Vector3 projectedPoint = ic.point;
					projectedPoint.Project(device.Viewport, camera.Projection, camera.View, camera.World);

					sprite.Begin(SpriteFlags.AlphaBlend);
					sprite.Transform = Matrix.Transformation2D(new Vector2(0.0f, 0.0f), 
						0.0f, new Vector2(scaleWidth, scaleHeight), 
						new Vector2(0, 0), 0.0f, new Vector2(projectedPoint.X, projectedPoint.Y));
					sprite.Draw(ic.texture, spriteSize, new Vector3(1.3f * iconWidth, 1.3f * iconHeight, 0), new Vector3(0, 0, 0), System.Drawing.Color.White);
					sprite.End();
				}			
			}
		}

		public void Dispose()
		{
			if (sprite != null)
			{
				sprite.Dispose();
				sprite = null;
			}
			if (alIcons != null)
			{
				foreach (IconClass ic in alIcons)
				{
					if (ic.texture != null)
					{
						ic.texture.Dispose();
						ic.texture = null;
					}
				}
				alIcons.Clear();
				alIcons = null;
			}
		}
	}
}