public void UpdateDrawTiles()
{
IsTilesUpdating = true;
TilesUpdateLock.AcquireWriterLock(1000);
try
{
if (ScreenArea != null)
{
var width = TilesArea.Width;
var height = TilesArea.Height;
var pointLeftTopPix = TileCenterPix.GetOffSet(-width / 2, -height / 2); //左上角像素坐标
var tileXYLeftTop = MercatorHelper.PixelToTileXY(pointLeftTopPix); //左上角的瓦片索引
var tilePixLeftTop = MercatorHelper.TileXYToPixel(tileXYLeftTop); //左上角瓦片像素坐标
//var tileDrawPositionLeftTop = new PointInt((int)(tilePixLeftTop.X - pointLeftTopPix.X + 0.5), (int)(tilePixLeftTop.Y - pointLeftTopPix.Y + 0.5));//屏幕坐标系下左上角瓦片的屏幕坐标
var tileDrawPositionLeftTop = TilesArea.LeftTop.GetOffSet((int)(tilePixLeftTop.X - pointLeftTopPix.X), (int)(tilePixLeftTop.Y - pointLeftTopPix.Y));
var tileXYCenter = MercatorHelper.PixelToTileXY(TileCenterPix);//中心瓦片索引
//var tilePixCenter = MercatorHelper.TileXYToPixel(tileXYCenter);//中心瓦片左上角所在像素坐标
var xCount = (int)Math.Ceiling((double)width / TileSize.Width) + 1; //X方向的瓦片数量
var yCount = (int)Math.Ceiling((double)height / TileSize.Height) + 1; //Y方向的瓦片数量
RectTilesBitmap = new RectInt(tileDrawPositionLeftTop, xCount * TileSize.Width, yCount * TileSize.Height);
tileDrawPositionLeftTop = new PointInt(0, 0);
GridInfo = new DrawGrid
{
GridSize = TileSize,
LeftTop = RectTilesBitmap.LeftTop,
RightBottom = RectTilesBitmap.RightBottom,
XCount = xCount,
YCount = yCount,
};
//计算要显示的绘图瓦片
if (DicDrawTile == null)
{
DicDrawTile = new Dictionary <Tile, DrawTile>();
}
DicDrawTile.Clear();
var minTileIndex = MapHelper.GetTileMatrixMinXY(Zoom);
var maxTileIndex = MapHelper.GetTileMatrixMaxXY(Zoom);
List <Tile> lstWantToLoad = new List <Tile>();
List <DrawTile> lstDrawTile = new List <DrawTile>();
//DateTime rt = DateTime.Now;
for (int x = 0; x < xCount; x++)
{
for (int y = 0; y < yCount; y++)
{
var drawPostiton = tileDrawPositionLeftTop.GetOffSet(x * TileSize.Width, y * TileSize.Height);
//Tile t = new Tile(tileXYLeftTop.X + x, tileXYLeftTop.Y + y, Zoom);
Tile t = TileManager.Singleton.GetTile(Zoom, new PointInt64(tileXYLeftTop.X + x, tileXYLeftTop.Y + y));
if (t == null)
{
t = new Tile(tileXYLeftTop.X + x, tileXYLeftTop.Y + y, Zoom);
}
if (t.TileIndex.X >= minTileIndex.Width && t.TileIndex.Y >= minTileIndex.Height &&
t.TileIndex.X <= maxTileIndex.Width && t.TileIndex.Y <= maxTileIndex.Height) //范围判断
{
var rt = new DrawTile()
{
DrawPosition = drawPostiton,
Tile = t
};
lstDrawTile.Add(rt);
////if (RotationAngle == 0 || MapHelper.CheckTileCrossRect(new RectInt(dt.DrawPosition.GetOffSet(TilesArea.LeftTop.X, TilesArea.LeftTop.Y), TileSize.Width, TileSize.Height), ScreenArea, RotationAngle))
//{
// //DicDrawTile.Add(t, rt);
// lstDrawTile.Add(rt);
// //if (t.TileImg == null)
// //{
// // lstWantToLoad.Add(t);
// //}
//}
}
}
}
lstDrawTile = lstDrawTile.OrderBy(d => Math.Abs(d.Tile.TileIndex.X - tileXYCenter.X) + Math.Abs(d.Tile.TileIndex.Y - tileXYCenter.Y)).ToList();
foreach (var item in lstDrawTile)
{
if (item.Tile.State == TileState.New)
{
TileManager.Singleton.AddTile(item.Tile);
}
if (item.Tile.TileImg == null)
{
lstWantToLoad.Add(item.Tile);
}
item.Tile.ReadTime = DateTime.Now;
DicDrawTile.Add(item.Tile, item);
}
lstWantToLoad.ForEach(a => { TileManager.Singleton.LoadTile(a); });
//_lastTilesRect = tilesRect;
//TileDrawOffset = new PointInt(0,0);
if (TilesUpdateComplete != null)
{
TilesUpdateComplete(DicDrawTile);
}
}
}
finally
{
IsTilesUpdating = false;
TilesUpdateLock.ReleaseWriterLock();
}
}
/// <summary>
/// 根据瓦片索引和瓦片尺寸获取像素坐标
/// </summary>
/// <param name="p"></param>
/// <param name="tileSize"></param>
/// <returns></returns>
public static PointInt64 TileXYToPixel(PointInt64 p)
{
return(MapHelper.TileXYToPixel(p, TileSize));
}
/// <summary>
/// 获取像素分辨率（每像素代表多少米）
/// </summary>
/// <param name="zoom">层级</param>
/// <param name="latitude">纬度</param>
/// <returns></returns>
public static double GetResolution(int zoom, double latitude)
{
return((Math.Cos(latitude * (Math.PI / 180)) * 2 * Math.PI * Axis) / MapHelper.GetTileMatrixSizePixel(zoom, TileSize).Width);
}
/// <summary>
/// 根据像素坐标和瓦片尺寸获取瓦片索引
/// </summary>
/// <param name="p"></param>
/// <param name="tileSize"></param>
/// <returns></returns>
public static PointInt64 PixelToTileXY(PointDouble p)
{
return(MapHelper.PixelToTileXY(p, TileSize));
}