static private PointF Sx(PointGeo a, double[] b)
{
double c = b[0] + b[1] * Math.Abs(a.lng); // c: 13387435.419690479
double d = Math.Abs(a.lat) / b[9];
double e = b[2] + b[3] * d + b[4] * d * d + b[5] * d * d * d + b[6] * d * d * d * d + b[7] * d * d * d * d * d + b[8] * d * d * d * d * d * d; // d: 3682405.2310994808
double f = c * (0 > a.lng ? -1 : 1); // c: 13387435.419690479
double g = e * (0 > a.lat ? -1 : 1); // d: 3682405.2310994808
return(new PointF(f, g));
}
public void execute(String baseDir, PointGeo leftBottomPoint, PointGeo rightTopPoint, List <int> zoomArray, int threadCnt, int mapType, String mapStyle)
{
mBaseDir = baseDir;
if (!String.IsNullOrEmpty(mapStyle))
{
this.mapStyle = mapStyle;
this.isCustomStyle = true;
}
if (mBaseDir.EndsWith("\\"))
{
mBaseMapTileDir = mBaseDir + MAP_TILE_DIR;
}
else
{
mBaseMapTileDir = mBaseDir + "\\" + MAP_TILE_DIR;
}
// 经纬度 缩放级别
mLeftBottomPoint = leftBottomPoint;
mrightTopPoint = rightTopPoint;
mZoomArray = zoomArray;
mThreadCnt = threadCnt;
mThreads = new List <Thread>();
mMapType = mapType;
mErrorCnt = 0;
mTotalTile = 0;
mDownloadedTile = 0;
mStop = false;
//创建目录
Util.createDir(mBaseMapTileDir);
//计算瓦片数
mTotalTile = getTileTotal();
//初始化任务
initTask(0);
//开始下载
for (int i = 0; i < mThreadCnt; i++)
{
//ThreadPool.QueueUserWorkItem(new WaitCallback(TaskProc), i);
Thread t = new Thread(new ParameterizedThreadStart(TaskProc));
mThreads.Add(t);
t.Start(i);
}
}
static public PointF lngLatToPoint(double lng, double lat)
{
PointGeo pt = new PointGeo();
pt.lng = MapTool.ft(lng, -180, 180); // lng: 120.26007
pt.lat = MapTool.lt(lat, -74, 74); // lat: 31.554487
//b = new F(a.lng, a.lat); // b: lat: 31.554487 lng: 120.26007
double[] c = null;
//北纬
for (int d = 0; d < MapTool.Wm.Length; d++)
{
if (pt.lat >= MapTool.Wm[d])
{
// Wm: [75, 60, 45, 30, 15, 0] （常量）
c = MapTool.bv[d]; // bv: 10*6的二维数组（常量）
break;
}
}
//南纬
if (c == null || c.Length <= 0)
{
for (int d = MapTool.Wm.Length - 1; 0 <= d; d--)
{
if (pt.lat <= -MapTool.Wm[d])
{
c = MapTool.bv[d];
break;
}
}
}
PointF fpt = MapTool.Sx(pt, c); //a: lat: 31.554487 lng: 120.26007, c = this.bv[d]; (d = 3)
return(new PointF(Convert.ToDouble(fpt.x.ToString("0.00")), Convert.ToDouble(fpt.y.ToString("0.00"))));
//DecimalFormat df = new DecimalFormat("#.00");
//return new PointF(Double.parseDouble(df.format(fpt.x)), Double.parseDouble(df.format(fpt.y))); // a: lat: 3682405.23 lng: 13387435.42
}
private void button_start_Click(object sender, EventArgs e)
{
if (this.textBox_left_bottom_lng.Text == "" ||
this.textBox_left_bottom_lat.Text == "" ||
this.textBox_right_top_lng.Text == "" ||
this.textBox_right_top_lat.Text == "")
{
MessageBox.Show("请输入经纬度，或者划定要下载的区域");
return;
}
//经纬度范围
double lng = Convert.ToDouble(this.textBox_left_bottom_lng.Text);
double lat = Convert.ToDouble(this.textBox_left_bottom_lat.Text);
PointGeo leftBottomPoint = new PointGeo(lng, lat); // 左下角
lng = Convert.ToDouble(this.textBox_right_top_lng.Text);
lat = Convert.ToDouble(this.textBox_right_top_lat.Text);
PointGeo rightTopPoint = new PointGeo(lng, lat); // 右上角
if (leftBottomPoint.lng == rightTopPoint.lng ||
leftBottomPoint.lat == rightTopPoint.lat)
{
MessageBox.Show("两个经度或者纬度不能一样");
return;
}
//放大级别
List <int> zoomArray = new List <int>();
for (int i = 0; i < mCheckBoxZoom.Length; i++)
{
if (mCheckBoxZoom[i].Checked)
{
zoomArray.Add(i + 1);
}
}
if (zoomArray.Count == 0)
{
MessageBox.Show("请选择放大级别");
return;
}
//下载内容
int mapType = 0;
if (this.radio_street_map.Checked) //街道图
{
mapType = 0;
}
else if (this.radio_satellite_map.Checked) //卫星图
{
mapType = 1;
}
else
{
mapType = 0;
}
//线程数
int threadCnt = Convert.ToInt16(numericUpDown_downlaod_thread_cnt.Value);
//保存路径
String savePath = this.textBox_maptile_dir.Text;
if (savePath == null || savePath.Length == 0)
{
MessageBox.Show("请设置保存目录");
return;
}
this.toolStripStatusLabel_download_status.Text = "开始下载";
mDownloader.execute(savePath, leftBottomPoint, rightTopPoint, zoomArray, threadCnt, mapType);
this.button_start.Enabled = false;
this.button_pause.Enabled = true;
}