private void button2_Click(object sender, EventArgs e)
{
_path = txtPath.Text;
if (_path.Equals(""))
{
MessageBox.Show("请选择存储路径！");
return;
}
int zoom = (int)numZoom.Value;
int thread = (int)numThread.Value;
PointF point1 = MapHelper.GetLocationByLatLng(p1, zoom); //将第一个点经纬度转换成平面2D坐标
PointF point2 = MapHelper.GetLocationByLatLng(p2, zoom); //将第二个点经纬度转换成平面2D坐标
int startX = (int)point1.X / 256; //起始列
int endX = (int)point2.X / 256; //结束列
if (endX == Math.Pow(2, zoom)) //结束列超出范围
{
endX--;
}
int startY = (int)point1.Y / 256; //起始行
int endY = (int)point2.Y / 256; //结束行
if (endY == Math.Pow(2, zoom)) //结束行超出范围
{
endY--;
}
_totalwidth = (endX - startX + 1) * 256; //合并图的宽度
_totalheight = (endY - startY + 1) * 256; //合并图的高度
int threadId = 0;
_waittodownload.Clear();
for (int y = startY; y <= endY; y++)
{
for (int x = startX; x <= endX; x++)
{
RectInfo ri = new RectInfo();
ri.threadId = threadId; //分别由不同的线程下载
ri.x = x;
ri.y = y;
ri.z = zoom;
ri.bComplete = false;
_waittodownload.Add(ri); //将每个小方块放入待下载集合
threadId = (threadId + 1) % thread; //由thread个不同线程下载图片
}
}
if (MessageBox.Show("共有" + _waittodownload.Count + "张图片需要下载，确定下载吗？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.OK)
{
_thread = thread;
_zoom = zoom;
_downloadnum = 0;
_normal = radioButton1.Checked;
button2.Enabled = false;
rchOuput.Clear();
groupBox2.Text = "输出(" + _waittodownload.Count + "张)";
_startTime = DateTime.Now;
for (int i = 1; i <= thread; ++i)
{
Thread t = new Thread(new ParameterizedThreadStart(DownloadThreadProc));
t.Start(i); //开启下载线程
}
}
}
/// <summary>
/// 下载线程方法
/// </summary>
/// <param name="param"></param>
public void DownloadThreadProc(object param)
{
int threadId = (int)param; //当前线程Id
MapService mapService = new MapService();
this.Invoke((Action) delegate() //输出
{
rchOuput.SelectionColor = Color.Blue;
rchOuput.AppendText(DateTime.Now.ToLongTimeString() + " 第" + threadId + "号线程开始执行\r\n");
});
for (int i = 0; i < _waittodownload.Count; i++)
{
RectInfo ri = (RectInfo)_waittodownload[i];
if ((!ri.bComplete) && (ri.threadId + 1 == threadId))
{
try
{
Bitmap map = mapService.LoadMapTile(ri.x, ri.y, ri.z, _normal ? MapMode.Normal : MapMode.Satellite, LoadMapMode.CacheServer);
string file = _path + "\\" + ri.z.ToString() + "\\" + ri.z.ToString() + "_" + ri.x.ToString() + "_" + ri.y.ToString() + ".jpg";
ri.Bitmap = map;
//文件保存格式 “缩放级别_列_行.jpg”
if (!Directory.Exists(_path + "\\" + ri.z.ToString()))
{
Directory.CreateDirectory(_path + "\\" + ri.z.ToString());
}
map.Save(file, System.Drawing.Imaging.ImageFormat.Jpeg);
this.Invoke((Action) delegate() //输出
{
rchOuput.SelectionColor = Color.Green;
rchOuput.AppendText(DateTime.Now.ToLongTimeString() + " 第" + threadId + "号线程下载图片" + ri.z.ToString() + "_" + ri.x.ToString() + "_" + ri.y.ToString() + ".jpg\r\n");
});
_downloadnum++;
ri.bComplete = true;
}
catch
{
this.Invoke((Action) delegate() //输出
{
rchOuput.SelectionColor = Color.Red;
rchOuput.AppendText(DateTime.Now.ToLongTimeString() + " 第" + threadId + "号线程下载图片" + ri.z.ToString() + "_" + ri.x.ToString() + "_" + ri.y.ToString() + ".jpg失败！\r\n");
});
}
}
}
this.Invoke((Action) delegate() //输出
{
rchOuput.SelectionColor = Color.Blue;
rchOuput.AppendText(DateTime.Now.ToLongTimeString() + " 第" + threadId + "号线程执行完毕\r\n");
});
_thread--; //工作线程数目减一
if (_thread == 0) //所有线程均结束
{
this.Invoke((Action) delegate() //输出
{
rchOuput.SelectionColor = Color.Blue;
rchOuput.AppendText(DateTime.Now.ToLongTimeString() + " 图片下载结束！共下载" + _downloadnum + "张，共耗时" + (DateTime.Now - _startTime).TotalSeconds + "秒");
button2.Enabled = true;
});
}
}