/// <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
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
{
string url = ri.url;
//根据每个图片的行、列、缩放级别 完善url
url += "&x=" + ri.x.ToString().Trim(); //列
url += "&y=" + ri.y.ToString().Trim(); //行
url += "&z=" + ri.z.ToString().Trim(); //缩放级别
Bitmap map = DownloadImage(url);
string file = _path + "\\" + 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”
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");
groupBox1.Enabled = true;
button2.Enabled = true;
linkLabel1.Enabled = true;
});
}
}
/// <summary>
/// 开始下载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
double flng = 0; //左上经度
double flat = 0; //左上纬度
double slng = 0; //右下经度
double slat = 0; //右下纬度
int zomm = 0; //缩放级别
int thread = 4; //下载线程数目
try
{
_path = txtPath.Text;
if (_path == "")
{
throw new Exception();
}
zomm = (int)numZoom.Value;
thread = (int)numThread.Value;
flng = double.Parse(txtfirstlng.Text);
flat = double.Parse(txtfirstlat.Text);
slng = double.Parse(txtsecondlng.Text);
slat = double.Parse(txtsecondlat.Text);
}
catch
{
MessageBox.Show("参数设置异常！");
}
Point p = LatLongToPixel(flat, flng, zomm); //将第一个点经纬度转换成平面2D坐标
Point p2 = LatLongToPixel(slat, slng, zomm); //将第二个点经纬度转换成平面2D坐标
int startX = p.X / 256; //起始列
int endX = p2.X / 256; //结束列
if (endX == Math.Pow(2, zomm)) //结束列超出范围
{
endX--;
}
int startY = p.Y / 256; //起始行
int endY = p2.Y / 256; //结束行
if (endY == Math.Pow(2, zomm)) //结束行超出范围
{
endY--;
}
//以上由startX endX startY endY 围成的区域 即为待下载区域 该区域由许多256*256大小方块组成
_totalwidth = (endX - startX + 1) * 256; //合并图的宽度
_totalheight = (endY - startY + 1) * 256; //合并图的高度
int serverId = 0;
int threadId = 0;
_waittodownload.Clear();
for (int y = startY; y <= endY; y++)
{
for (int x = startX; x <= endX; x++)
{
RectInfo ri = new RectInfo();
ri.serverId = serverId; //分别从不同的服务器下载
ri.threadId = threadId; //分别由不同的线程下载
ri.url = BuildURL(serverId);
ri.x = x;
ri.y = y;
ri.z = zomm;
ri.bComplete = false;
_waittodownload.Add(ri); //将每个小方块放入待下载集合
serverId = (serverId + 1) % 4; //从4个不同的服务器上下载图片
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 = zomm;
_downloadnum = 0;
groupBox1.Enabled = false;
button2.Enabled = false;
linkLabel1.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>
/// 开始下载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
double flng=0; //左上经度
double flat=0; //左上纬度
double slng=0; //右下经度
double slat=0; //右下纬度
int zomm=0; //缩放级别
int thread=4; //下载线程数目
try
{
_path = txtPath.Text;
if (_path == "")
{
throw new Exception();
}
zomm = (int)numZoom.Value;
thread = (int)numThread.Value;
flng = double.Parse(txtfirstlng.Text);
flat = double.Parse(txtfirstlat.Text);
slng = double.Parse(txtsecondlng.Text);
slat = double.Parse(txtsecondlat.Text);
}
catch
{
MessageBox.Show("参数设置异常！");
}
Point p = LatLongToPixel(flat, flng, zomm); //将第一个点经纬度转换成平面2D坐标
Point p2 = LatLongToPixel(slat, slng, zomm); //将第二个点经纬度转换成平面2D坐标
int startX = p.X / 256; //起始列
int endX = p2.X / 256; //结束列
if (endX == Math.Pow(2, zomm)) //结束列超出范围
{
endX--;
}
int startY = p.Y / 256; //起始行
int endY = p2.Y / 256; //结束行
if (endY == Math.Pow(2, zomm)) //结束行超出范围
{
endY--;
}
//以上由startX endX startY endY 围成的区域 即为待下载区域 该区域由许多256*256大小方块组成
_totalwidth = (endX - startX + 1) * 256; //合并图的宽度
_totalheight = (endY - startY + 1) * 256; //合并图的高度
int serverId = 0;
int threadId = 0;
_waittodownload.Clear();
for (int y = startY; y <= endY; y++)
{
for (int x = startX; x <= endX; x++)
{
RectInfo ri = new RectInfo();
ri.serverId = serverId; //分别从不同的服务器下载
ri.threadId = threadId; //分别由不同的线程下载
ri.url = BuildURL(serverId);
ri.x = x;
ri.y = y;
ri.z = zomm;
ri.bComplete = false;
_waittodownload.Add(ri); //将每个小方块放入待下载集合
serverId = (serverId + 1) % 4; //从4个不同的服务器上下载图片
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 = zomm;
_downloadnum = 0;
groupBox1.Enabled = false;
button2.Enabled = false;
linkLabel1.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
}
}
}