C# 下载地图碎片文件并自动并合的下载引擎 源码下载

下载地图碎片文件并自动并合的下载引擎 例子

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Imaging;using System.IO;namespace Smart.Map{ /// <summary> /// 图层区域 /// </summary> public class LayerArea { /// <summary> /// 区域开始坐标 /// </summary> public Vectory2D Start { get; set; } /// <summary> /// 区域结束坐标 /// </summary> public Vectory2D End { get; set; } /// <summary> /// 区域大小px /// </summary> public Size AreaSize { get; set; } /// <summary> /// 区域图片容量kb /// </summary> public float Size { get; set; } /// <summary> /// 瓦片大小 /// </summary> public Size FragmentSize { get; set; } /// <summary> /// 区域瓦片总数 /// </summary> public int FragmentCount { get { return this.MapFragments.Count(); } } /// <summary> /// Url模板 /// </summary> public string UrlTemplate { get; set; } /// <summary> /// 区域瓦片集合 /// </summary> public List<MapFragment> MapFragments { get; set; } /// <summary> /// 组合图片 /// </summary> /// <param name="fileName">保存文件名称</param> /// <param name="format">图片格式</param> /// <param name="zeroPoint">地图0点坐标位置</param> public void Compose(string fileName, ImageFormat format, ZeroPoint zeroPoint) { float xCount = this.End.X - this.Start.X; float yCount = this.End.Y - this.Start.Y; //垂直方向碎片总数 int VerticalSizeCount = (int)Math.Abs(yCount); //水平方向总数 int HorizontalSizeCount = (int)Math.Abs(xCount); //构建瓦片拼接的最终地图 Bitmap map = new Bitmap( //水平方向元素总数*单个碎片图像宽度 HorizontalSizeCount * (int)this.FragmentSize.Width, //垂直方向元素总数*单个碎片图片高度 VerticalSizeCount * (int)this.FragmentSize.Height); //GDI 画图 Graphics tempGraphics = Graphics.FromImage(map); //逐行循环 for (int i = 0; i < HorizontalSizeCount; i ) { //逐列循环 for (int j = 0; j < VerticalSizeCount; j ) { //碎片绘制位置 Vectory2D point = new Vectory2D(); point.X = i * this.FragmentSize.Width; point.Y = j * this.FragmentSize.Height; //得到线性内存表的偏移量公式:偏移量=每行列数*当前行 当前列 int offset = VerticalSizeCount * i j; //从缓存碎片拼接图片 string cacheMapPath = MapFragments[offset].SavePath "\\" MapFragments[offset].FileName; using (Bitmap cacheMap = new Bitmap(cacheMapPath)) { //将碎片绘制到内存 //绘图0点坐标左上角；地图0点坐标左下角 switch (zeroPoint) { case ZeroPoint.LeftBottom: tempGraphics.DrawImage( //MapFragments[offset].Image, cacheMap, point.X, AreaSize.Height - point.Y - this.FragmentSize.Height); break; case ZeroPoint.LeftTop: tempGraphics.DrawImage( //MapFragments[offset].Image, cacheMap, point.X, point.Y); break; } } } } //保存 tempGraphics.Dispose(); FileInfo fileInfo = new FileInfo(fileName); if (!Directory.Exists(fileInfo.DirectoryName)) { Directory.CreateDirectory(fileInfo.DirectoryName); } map.Save(fileName, format); } /// <summary> /// 下载图片 /// </summary> public void Download(string savepath) { if (!Directory.Exists(savepath)) { Directory.CreateDirectory(savepath); } //构建碎片 BindFragments(savepath); foreach (MapFragment map in MapFragments) { //是否可以考虑线程下载? map.Download(); } } /// <summary> /// 构建碎片 /// </summary> private void BindFragments(string savepath) { this.MapFragments = new List<MapFragment>(); float xCount = this.End.X - this.Start.X; float yCount = this.End.Y - this.Start.Y; //垂直方向碎片总数 int VerticalSizeCount = (int)Math.Abs(yCount); //水平方向总数 int HorizontalSizeCount = (int)Math.Abs(xCount); //初始化瓦片拼接图像大小 this.AreaSize = new Map.Size() { Width = HorizontalSizeCount * (int)this.FragmentSize.Width, Height = VerticalSizeCount * (int)this.FragmentSize.Height }; //圆点坐标：左下角 //行单位总数循环 for (int i = 0; i < HorizontalSizeCount; i ) { //列单位总数循环 for (int j = 0; j < VerticalSizeCount; j ) { #region 构建碎片请求Url地址 MapFragment fragment = new MapFragment(); fragment.FragmentSize = this.FragmentSize; float x = 0; float y = 0; //水平方向循环 if (xCount < 0) { //水平向左步进 x = this.Start.X - (i 1); } else { //水平向右步进 x = this.Start.X (i 1); } //垂直方向循环 if (yCount < 0) { //垂直向下步进 y = this.Start.Y - (j 1); } else { //垂直向上步进 y = this.Start.Y (j 1); } //替换Url模板标签x,y string tempUrlTemplate = this.UrlTemplate; tempUrlTemplate = tempUrlTemplate.Replace("{POINTX}", x.ToString()); tempUrlTemplate = tempUrlTemplate.Replace("{POINTY}", y.ToString()); fragment.DownloadUrl = tempUrlTemplate; /*瓦片图片索引文件名称*/ fragment.Format = ImageFormat.Png; fragment.FileName = string.Format("{0}-{1}.{2}", x.ToString(), y.ToString(), fragment.Format.ToString()); fragment.SavePath = savepath; this.MapFragments.Add(fragment); #endregion } } } }}